1916 lines
42 KiB
C
1916 lines
42 KiB
C
/* $OpenBSD: main.c,v 1.57 2015/09/10 22:48:58 nicm Exp $ */
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/* $OpenBSD: tty.c,v 1.10 2014/08/10 02:44:26 guenther Exp $ */
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/* $OpenBSD: io.c,v 1.26 2015/09/11 08:00:27 guenther Exp $ */
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/* $OpenBSD: table.c,v 1.16 2015/09/01 13:12:31 tedu Exp $ */
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/*-
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* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
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* 2011, 2012, 2013, 2014, 2015, 2016, 2017
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* mirabilos <m@mirbsd.org>
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*
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* Provided that these terms and disclaimer and all copyright notices
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* are retained or reproduced in an accompanying document, permission
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* is granted to deal in this work without restriction, including un-
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* limited rights to use, publicly perform, distribute, sell, modify,
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* merge, give away, or sublicence.
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*
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* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
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* the utmost extent permitted by applicable law, neither express nor
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* implied; without malicious intent or gross negligence. In no event
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* may a licensor, author or contributor be held liable for indirect,
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* direct, other damage, loss, or other issues arising in any way out
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* of dealing in the work, even if advised of the possibility of such
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* damage or existence of a defect, except proven that it results out
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* of said person's immediate fault when using the work as intended.
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*/
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#define EXTERN
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#include "sh.h"
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#if HAVE_LANGINFO_CODESET
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#include <langinfo.h>
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#endif
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#if HAVE_SETLOCALE_CTYPE
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#include <locale.h>
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#endif
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__RCSID("$MirOS: src/bin/mksh/main.c,v 1.328 2017/03/19 22:31:27 tg Exp $");
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extern char **environ;
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#ifndef MKSHRC_PATH
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#define MKSHRC_PATH "~/.mkshrc"
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#endif
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#ifndef MKSH_DEFAULT_TMPDIR
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#define MKSH_DEFAULT_TMPDIR MKSH_UNIXROOT "/tmp"
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#endif
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static uint8_t isuc(const char *);
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static int main_init(int, const char *[], Source **, struct block **);
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void chvt_reinit(void);
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static void reclaim(void);
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static void remove_temps(struct temp *);
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static mksh_uari_t rndsetup(void);
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#ifdef SIGWINCH
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static void x_sigwinch(int);
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#endif
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static const char initsubs[] =
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"${PS2=> }"
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"${PS3=#? }"
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"${PS4=+ }"
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"${SECONDS=0}"
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"${TMOUT=0}"
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"${EPOCHREALTIME=}";
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static const char *initcoms[] = {
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Ttypeset, "-r", initvsn, NULL,
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Ttypeset, "-x", "HOME", TPATH, TSHELL, NULL,
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Ttypeset, "-i10", "COLUMNS", "LINES", "SECONDS", "TMOUT", NULL,
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Talias,
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"integer=\\\\builtin typeset -i",
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"local=\\\\builtin typeset",
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/* not "alias -t --": hash -r needs to work */
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"hash=\\\\builtin alias -t",
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"type=\\\\builtin whence -v",
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"autoload=\\\\builtin typeset -fu",
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"functions=\\\\builtin typeset -f",
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"history=\\\\builtin fc -l",
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"nameref=\\\\builtin typeset -n",
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"nohup=nohup ",
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"r=\\\\builtin fc -e -",
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"login=\\\\builtin exec login",
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NULL,
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/* this is what AT&T ksh seems to track, with the addition of emacs */
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Talias, "-tU",
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Tcat, "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
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"make", "mv", "pr", "rm", "sed", Tsh, "vi", "who", NULL,
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NULL
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};
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static const char *restr_com[] = {
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Ttypeset, "-r", TPATH, "ENV", TSHELL, NULL
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};
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static bool initio_done;
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/* top-level parsing and execution environment */
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static struct env env;
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struct env *e = &env;
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static mksh_uari_t
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rndsetup(void)
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{
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register uint32_t h;
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struct {
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ALLOC_ITEM alloc_INT;
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void *dataptr, *stkptr, *mallocptr;
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#if defined(__GLIBC__) && (__GLIBC__ >= 2)
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sigjmp_buf jbuf;
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#endif
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struct timeval tv;
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} *bufptr;
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char *cp;
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cp = alloc(sizeof(*bufptr) - sizeof(ALLOC_ITEM), APERM);
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/* clear the allocated space, for valgrind and to avoid UB */
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memset(cp, 0, sizeof(*bufptr) - sizeof(ALLOC_ITEM));
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/* undo what alloc() did to the malloc result address */
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bufptr = (void *)(cp - sizeof(ALLOC_ITEM));
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/* PIE or something similar provides us with deltas here */
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bufptr->dataptr = &rndsetupstate;
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/* ASLR in at least Windows, Linux, some BSDs */
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bufptr->stkptr = &bufptr;
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/* randomised malloc in BSD (and possibly others) */
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bufptr->mallocptr = bufptr;
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#if defined(__GLIBC__) && (__GLIBC__ >= 2)
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/* glibc pointer guard */
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sigsetjmp(bufptr->jbuf, 1);
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#endif
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/* introduce variation (and yes, second arg MBZ for portability) */
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mksh_TIME(bufptr->tv);
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#ifdef MKSH_ALLOC_CATCH_UNDERRUNS
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mprotect(((char *)bufptr) + 4096, 4096, PROT_READ | PROT_WRITE);
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#endif
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h = chvt_rndsetup(bufptr, sizeof(*bufptr));
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afree(cp, APERM);
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return ((mksh_uari_t)h);
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}
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void
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chvt_reinit(void)
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{
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kshpid = procpid = getpid();
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ksheuid = geteuid();
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kshpgrp = getpgrp();
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kshppid = getppid();
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}
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static const char *empty_argv[] = {
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Tmksh, NULL
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};
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static uint8_t
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isuc(const char *cx) {
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char *cp, *x;
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uint8_t rv = 0;
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if (!cx || !*cx)
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return (0);
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/* uppercase a string duplicate */
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strdupx(x, cx, ATEMP);
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cp = x;
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while ((*cp = ksh_toupper(*cp)))
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++cp;
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/* check for UTF-8 */
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if (strstr(x, "UTF-8") || strstr(x, "UTF8"))
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rv = 1;
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/* free copy and out */
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afree(x, ATEMP);
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return (rv);
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}
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static int
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main_init(int argc, const char *argv[], Source **sp, struct block **lp)
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{
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int argi, i;
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Source *s = NULL;
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struct block *l;
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unsigned char restricted_shell, errexit, utf_flag;
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char *cp;
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const char *ccp, **wp;
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struct tbl *vp;
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struct stat s_stdin;
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#if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
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ssize_t k;
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#endif
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#ifdef __OS2__
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for (i = 0; i < 3; ++i)
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if (!isatty(i))
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setmode(i, O_BINARY);
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#endif
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/* do things like getpgrp() et al. */
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chvt_reinit();
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/* make sure argv[] is sane, for weird OSes */
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if (!*argv) {
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argv = empty_argv;
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argc = 1;
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}
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kshname = argv[0];
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/* initialise permanent Area */
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ainit(&aperm);
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/* max. name length: -2147483648 = 11 (+ NUL) */
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vtemp = alloc(offsetof(struct tbl, name[0]) + 12, APERM);
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/* set up base environment */
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env.type = E_NONE;
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ainit(&env.area);
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/* set up global l->vars and l->funs */
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newblock();
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/* Do this first so output routines (eg, errorf, shellf) can work */
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initio();
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/* determine the basename (without '-' or path) of the executable */
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ccp = kshname;
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goto begin_parsing_kshname;
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while ((i = ccp[argi++])) {
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if (mksh_cdirsep(i)) {
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ccp += argi;
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begin_parsing_kshname:
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argi = 0;
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if (*ccp == '-')
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++ccp;
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}
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}
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if (!*ccp)
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ccp = empty_argv[0];
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/*
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* Turn on nohup by default. (AT&T ksh does not have a nohup
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* option - it always sends the hup).
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*/
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Flag(FNOHUP) = 1;
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/*
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* Turn on brace expansion by default. AT&T kshs that have
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* alternation always have it on.
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*/
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Flag(FBRACEEXPAND) = 1;
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/*
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* Turn on "set -x" inheritance by default.
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*/
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Flag(FXTRACEREC) = 1;
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/* define built-in commands and see if we were called as one */
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ktinit(APERM, &builtins,
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/* currently up to 54 builtins: 75% of 128 = 2^7 */
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7);
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for (i = 0; mkshbuiltins[i].name != NULL; i++)
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if (!strcmp(ccp, builtin(mkshbuiltins[i].name,
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mkshbuiltins[i].func)))
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Flag(FAS_BUILTIN) = 1;
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if (!Flag(FAS_BUILTIN)) {
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/* check for -T option early */
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argi = parse_args(argv, OF_FIRSTTIME, NULL);
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if (argi < 0)
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return (1);
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#if defined(MKSH_BINSHPOSIX) || defined(MKSH_BINSHREDUCED)
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/* are we called as -sh or /bin/sh or so? */
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if (!strcmp(ccp, "sh" MKSH_EXE_EXT)) {
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/* either also turns off braceexpand */
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#ifdef MKSH_BINSHPOSIX
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/* enable better POSIX conformance */
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change_flag(FPOSIX, OF_FIRSTTIME, true);
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#endif
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#ifdef MKSH_BINSHREDUCED
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/* enable kludge/compat mode */
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change_flag(FSH, OF_FIRSTTIME, true);
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#endif
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}
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#endif
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}
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initvar();
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initctypes();
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inittraps();
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coproc_init();
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/* set up variable and command dictionaries */
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ktinit(APERM, &taliases, 0);
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ktinit(APERM, &aliases, 0);
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#ifndef MKSH_NOPWNAM
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ktinit(APERM, &homedirs, 0);
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#endif
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/* define shell keywords */
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initkeywords();
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init_histvec();
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/* initialise tty size before importing environment */
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change_winsz();
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#ifdef _PATH_DEFPATH
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def_path = _PATH_DEFPATH;
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#else
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#ifdef _CS_PATH
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if ((k = confstr(_CS_PATH, NULL, 0)) > 0 &&
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confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
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def_path = cp;
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else
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#endif
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/*
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* this is uniform across all OSes unless it
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* breaks somewhere hard; don't try to optimise,
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* e.g. add stuff for Interix or remove /usr
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* for HURD, because e.g. Debian GNU/HURD is
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* "keeping a regular /usr"; this is supposed
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* to be a sane 'basic' default PATH
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*/
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def_path = MKSH_UNIXROOT "/bin" MKSH_PATHSEPS
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MKSH_UNIXROOT "/usr/bin" MKSH_PATHSEPS
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MKSH_UNIXROOT "/sbin" MKSH_PATHSEPS
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MKSH_UNIXROOT "/usr/sbin";
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#endif
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/*
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* Set PATH to def_path (will set the path global variable).
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* (import of environment below will probably change this setting).
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*/
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vp = global(TPATH);
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/* setstr can't fail here */
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setstr(vp, def_path, KSH_RETURN_ERROR);
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#ifndef MKSH_NO_CMDLINE_EDITING
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/*
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* Set edit mode to emacs by default, may be overridden
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* by the environment or the user. Also, we want tab completion
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* on in vi by default.
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*/
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change_flag(FEMACS, OF_SPECIAL, true);
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#if !MKSH_S_NOVI
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Flag(FVITABCOMPLETE) = 1;
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#endif
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#endif
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/* import environment */
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if (environ != NULL) {
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wp = (const char **)environ;
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while (*wp != NULL) {
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rndpush(*wp);
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typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
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++wp;
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}
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}
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/* for security */
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typeset("IFS= \t\n", 0, 0, 0, 0);
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/* assign default shell variable values */
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typeset("PATHSEP=" MKSH_PATHSEPS, 0, 0, 0, 0);
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substitute(initsubs, 0);
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/* Figure out the current working directory and set $PWD */
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vp = global(TPWD);
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cp = str_val(vp);
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/* Try to use existing $PWD if it is valid */
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set_current_wd((mksh_abspath(cp) && test_eval(NULL, TO_FILEQ, cp,
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Tdot, true)) ? cp : NULL);
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if (current_wd[0])
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simplify_path(current_wd);
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/* Only set pwd if we know where we are or if it had a bogus value */
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if (current_wd[0] || *cp)
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/* setstr can't fail here */
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setstr(vp, current_wd, KSH_RETURN_ERROR);
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for (wp = initcoms; *wp != NULL; wp++) {
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c_builtin(wp);
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while (*wp != NULL)
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wp++;
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}
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setint_n(global("OPTIND"), 1, 10);
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kshuid = getuid();
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kshgid = getgid();
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kshegid = getegid();
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safe_prompt = ksheuid ? "$ " : "# ";
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vp = global("PS1");
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/* Set PS1 if unset or we are root and prompt doesn't contain a # */
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if (!(vp->flag & ISSET) ||
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(!ksheuid && !strchr(str_val(vp), '#')))
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/* setstr can't fail here */
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setstr(vp, safe_prompt, KSH_RETURN_ERROR);
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setint_n((vp = global("BASHPID")), 0, 10);
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vp->flag |= INT_U;
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setint_n((vp = global("PGRP")), (mksh_uari_t)kshpgrp, 10);
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vp->flag |= INT_U;
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setint_n((vp = global("PPID")), (mksh_uari_t)kshppid, 10);
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vp->flag |= INT_U;
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setint_n((vp = global("USER_ID")), (mksh_uari_t)ksheuid, 10);
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vp->flag |= INT_U;
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setint_n((vp = global("KSHUID")), (mksh_uari_t)kshuid, 10);
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vp->flag |= INT_U;
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setint_n((vp = global("KSHEGID")), (mksh_uari_t)kshegid, 10);
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vp->flag |= INT_U;
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setint_n((vp = global("KSHGID")), (mksh_uari_t)kshgid, 10);
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vp->flag |= INT_U;
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setint_n((vp = global("RANDOM")), rndsetup(), 10);
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vp->flag |= INT_U;
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setint_n((vp_pipest = global("PIPESTATUS")), 0, 10);
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/* Set this before parsing arguments */
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Flag(FPRIVILEGED) = (kshuid != ksheuid || kshgid != kshegid) ? 2 : 0;
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/* this to note if monitor is set on command line (see below) */
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#ifndef MKSH_UNEMPLOYED
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Flag(FMONITOR) = 127;
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#endif
|
|
/* this to note if utf-8 mode is set on command line (see below) */
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UTFMODE = 2;
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|
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if (!Flag(FAS_BUILTIN)) {
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argi = parse_args(argv, OF_CMDLINE, NULL);
|
|
if (argi < 0)
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return (1);
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}
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|
|
/* process this later only, default to off (hysterical raisins) */
|
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utf_flag = UTFMODE;
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UTFMODE = 0;
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|
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if (Flag(FAS_BUILTIN)) {
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/* auto-detect from environment variables, always */
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utf_flag = 3;
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} else if (Flag(FCOMMAND)) {
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s = pushs(SSTRINGCMDLINE, ATEMP);
|
|
if (!(s->start = s->str = argv[argi++]))
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|
errorf(Tf_optfoo, "", "", 'c', Treq_arg);
|
|
while (*s->str) {
|
|
if (*s->str != ' ' && ctype(*s->str, C_QUOTE))
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break;
|
|
s->str++;
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}
|
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if (!*s->str)
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|
s->flags |= SF_MAYEXEC;
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|
s->str = s->start;
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|
#ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
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|
/* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
|
|
if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
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++argi;
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|
#endif
|
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if (argv[argi])
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kshname = argv[argi++];
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} else if (argi < argc && !Flag(FSTDIN)) {
|
|
s = pushs(SFILE, ATEMP);
|
|
#ifdef __OS2__
|
|
/*
|
|
* A bug in OS/2 extproc (like shebang) handling makes
|
|
* it not pass the full pathname of a script, so we need
|
|
* to search for it. This changes the behaviour of a
|
|
* simple "mksh foo", but can't be helped.
|
|
*/
|
|
s->file = search_path(argv[argi++], path, X_OK, NULL);
|
|
if (!s->file || !*s->file)
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s->file = argv[argi - 1];
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|
#else
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|
s->file = argv[argi++];
|
|
#endif
|
|
s->u.shf = shf_open(s->file, O_RDONLY, 0,
|
|
SHF_MAPHI | SHF_CLEXEC);
|
|
if (s->u.shf == NULL) {
|
|
shl_stdout_ok = false;
|
|
warningf(true, Tf_sD_s, s->file, cstrerror(errno));
|
|
/* mandated by SUSv4 */
|
|
exstat = 127;
|
|
unwind(LERROR);
|
|
}
|
|
kshname = s->file;
|
|
} else {
|
|
Flag(FSTDIN) = 1;
|
|
s = pushs(SSTDIN, ATEMP);
|
|
s->file = "<stdin>";
|
|
s->u.shf = shf_fdopen(0, SHF_RD | can_seek(0),
|
|
NULL);
|
|
if (isatty(0) && isatty(2)) {
|
|
Flag(FTALKING) = Flag(FTALKING_I) = 1;
|
|
/* The following only if isatty(0) */
|
|
s->flags |= SF_TTY;
|
|
s->u.shf->flags |= SHF_INTERRUPT;
|
|
s->file = NULL;
|
|
}
|
|
}
|
|
|
|
/* this bizarreness is mandated by POSIX */
|
|
if (fstat(0, &s_stdin) >= 0 && S_ISCHR(s_stdin.st_mode) &&
|
|
Flag(FTALKING))
|
|
reset_nonblock(0);
|
|
|
|
/* initialise job control */
|
|
j_init();
|
|
/* do this after j_init() which calls tty_init_state() */
|
|
if (Flag(FTALKING)) {
|
|
if (utf_flag == 2) {
|
|
#ifndef MKSH_ASSUME_UTF8
|
|
/* auto-detect from locale or environment */
|
|
utf_flag = 4;
|
|
#else /* this may not be an #elif */
|
|
#if MKSH_ASSUME_UTF8
|
|
utf_flag = 1;
|
|
#else
|
|
/* always disable UTF-8 (for interactive) */
|
|
utf_flag = 0;
|
|
#endif
|
|
#endif
|
|
}
|
|
#ifndef MKSH_NO_CMDLINE_EDITING
|
|
x_init();
|
|
#endif
|
|
}
|
|
|
|
#ifdef SIGWINCH
|
|
sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
|
|
setsig(&sigtraps[SIGWINCH], x_sigwinch,
|
|
SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
|
|
#endif
|
|
|
|
l = e->loc;
|
|
if (Flag(FAS_BUILTIN)) {
|
|
l->argc = argc;
|
|
l->argv = argv;
|
|
l->argv[0] = ccp;
|
|
} else {
|
|
l->argc = argc - argi;
|
|
/*
|
|
* allocate a new array because otherwise, when we modify
|
|
* it in-place, ps(1) output changes; the meaning of argc
|
|
* here is slightly different as it excludes kshname, and
|
|
* we add a trailing NULL sentinel as well
|
|
*/
|
|
l->argv = alloc2(l->argc + 2, sizeof(void *), APERM);
|
|
l->argv[0] = kshname;
|
|
memcpy(&l->argv[1], &argv[argi], l->argc * sizeof(void *));
|
|
l->argv[l->argc + 1] = NULL;
|
|
getopts_reset(1);
|
|
}
|
|
|
|
/* divine the initial state of the utf8-mode Flag */
|
|
ccp = null;
|
|
switch (utf_flag) {
|
|
|
|
/* auto-detect from locale or environment */
|
|
case 4:
|
|
#if HAVE_SETLOCALE_CTYPE
|
|
ccp = setlocale(LC_CTYPE, "");
|
|
#if HAVE_LANGINFO_CODESET
|
|
if (!isuc(ccp))
|
|
ccp = nl_langinfo(CODESET);
|
|
#endif
|
|
if (!isuc(ccp))
|
|
ccp = null;
|
|
#endif
|
|
/* FALLTHROUGH */
|
|
|
|
/* auto-detect from environment */
|
|
case 3:
|
|
/* these were imported from environ earlier */
|
|
if (ccp == null)
|
|
ccp = str_val(global("LC_ALL"));
|
|
if (ccp == null)
|
|
ccp = str_val(global("LC_CTYPE"));
|
|
if (ccp == null)
|
|
ccp = str_val(global("LANG"));
|
|
UTFMODE = isuc(ccp);
|
|
break;
|
|
|
|
/* not set on command line, not FTALKING */
|
|
case 2:
|
|
/* unknown values */
|
|
default:
|
|
utf_flag = 0;
|
|
/* FALLTHROUGH */
|
|
|
|
/* known values */
|
|
case 1:
|
|
case 0:
|
|
UTFMODE = utf_flag;
|
|
break;
|
|
}
|
|
|
|
/* Disable during .profile/ENV reading */
|
|
restricted_shell = Flag(FRESTRICTED);
|
|
Flag(FRESTRICTED) = 0;
|
|
errexit = Flag(FERREXIT);
|
|
Flag(FERREXIT) = 0;
|
|
|
|
/*
|
|
* Do this before profile/$ENV so that if it causes problems in them,
|
|
* user will know why things broke.
|
|
*/
|
|
if (!current_wd[0] && Flag(FTALKING))
|
|
warningf(false, "can't determine current directory");
|
|
|
|
if (Flag(FLOGIN))
|
|
include(MKSH_SYSTEM_PROFILE, 0, NULL, true);
|
|
if (!Flag(FPRIVILEGED)) {
|
|
if (Flag(FLOGIN))
|
|
include(substitute("$HOME/.profile", 0), 0, NULL, true);
|
|
if (Flag(FTALKING)) {
|
|
cp = substitute(substitute("${ENV:-" MKSHRC_PATH "}",
|
|
0), DOTILDE);
|
|
if (cp[0] != '\0')
|
|
include(cp, 0, NULL, true);
|
|
}
|
|
} else {
|
|
include(MKSH_SUID_PROFILE, 0, NULL, true);
|
|
/* turn off -p if not set explicitly */
|
|
if (Flag(FPRIVILEGED) != 1)
|
|
change_flag(FPRIVILEGED, OF_INTERNAL, false);
|
|
}
|
|
|
|
if (restricted_shell) {
|
|
c_builtin(restr_com);
|
|
/* After typeset command... */
|
|
Flag(FRESTRICTED) = 1;
|
|
}
|
|
Flag(FERREXIT) = errexit;
|
|
|
|
if (Flag(FTALKING) && s)
|
|
hist_init(s);
|
|
else
|
|
/* set after ENV */
|
|
Flag(FTRACKALL) = 1;
|
|
|
|
alarm_init();
|
|
|
|
*sp = s;
|
|
*lp = l;
|
|
return (0);
|
|
}
|
|
|
|
/* this indirection barrier reduces stack usage during normal operation */
|
|
|
|
int
|
|
main(int argc, const char *argv[])
|
|
{
|
|
int rv;
|
|
Source *s;
|
|
struct block *l;
|
|
|
|
if ((rv = main_init(argc, argv, &s, &l)) == 0) {
|
|
if (Flag(FAS_BUILTIN)) {
|
|
rv = c_builtin(l->argv);
|
|
} else {
|
|
shell(s, true);
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
return (rv);
|
|
}
|
|
|
|
int
|
|
include(const char *name, int argc, const char **argv, bool intr_ok)
|
|
{
|
|
Source *volatile s = NULL;
|
|
struct shf *shf;
|
|
const char **volatile old_argv;
|
|
volatile int old_argc;
|
|
int i;
|
|
|
|
shf = shf_open(name, O_RDONLY, 0, SHF_MAPHI | SHF_CLEXEC);
|
|
if (shf == NULL)
|
|
return (-1);
|
|
|
|
if (argv) {
|
|
old_argv = e->loc->argv;
|
|
old_argc = e->loc->argc;
|
|
} else {
|
|
old_argv = NULL;
|
|
old_argc = 0;
|
|
}
|
|
newenv(E_INCL);
|
|
if ((i = kshsetjmp(e->jbuf))) {
|
|
quitenv(s ? s->u.shf : NULL);
|
|
if (old_argv) {
|
|
e->loc->argv = old_argv;
|
|
e->loc->argc = old_argc;
|
|
}
|
|
switch (i) {
|
|
case LRETURN:
|
|
case LERROR:
|
|
/* see below */
|
|
return (exstat & 0xFF);
|
|
case LINTR:
|
|
/*
|
|
* intr_ok is set if we are including .profile or $ENV.
|
|
* If user ^Cs out, we don't want to kill the shell...
|
|
*/
|
|
if (intr_ok && ((exstat & 0xFF) - 128) != SIGTERM)
|
|
return (1);
|
|
/* FALLTHROUGH */
|
|
case LEXIT:
|
|
case LLEAVE:
|
|
case LSHELL:
|
|
unwind(i);
|
|
/* NOTREACHED */
|
|
default:
|
|
internal_errorf("include %d", i);
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
if (argv) {
|
|
e->loc->argv = argv;
|
|
e->loc->argc = argc;
|
|
}
|
|
s = pushs(SFILE, ATEMP);
|
|
s->u.shf = shf;
|
|
strdupx(s->file, name, ATEMP);
|
|
i = shell(s, false);
|
|
quitenv(s->u.shf);
|
|
if (old_argv) {
|
|
e->loc->argv = old_argv;
|
|
e->loc->argc = old_argc;
|
|
}
|
|
/* & 0xff to ensure value not -1 */
|
|
return (i & 0xFF);
|
|
}
|
|
|
|
/* spawn a command into a shell optionally keeping track of the line number */
|
|
int
|
|
command(const char *comm, int line)
|
|
{
|
|
Source *s, *sold = source;
|
|
int rv;
|
|
|
|
s = pushs(SSTRING, ATEMP);
|
|
s->start = s->str = comm;
|
|
s->line = line;
|
|
rv = shell(s, false);
|
|
source = sold;
|
|
return (rv);
|
|
}
|
|
|
|
/*
|
|
* run the commands from the input source, returning status.
|
|
*/
|
|
int
|
|
shell(Source * volatile s, volatile bool toplevel)
|
|
{
|
|
struct op *t;
|
|
volatile bool wastty = tobool(s->flags & SF_TTY);
|
|
volatile uint8_t attempts = 13;
|
|
volatile bool interactive = Flag(FTALKING) && toplevel;
|
|
volatile bool sfirst = true;
|
|
Source *volatile old_source = source;
|
|
int i;
|
|
|
|
newenv(E_PARSE);
|
|
if (interactive)
|
|
really_exit = false;
|
|
switch ((i = kshsetjmp(e->jbuf))) {
|
|
case 0:
|
|
break;
|
|
case LINTR:
|
|
/* we get here if SIGINT not caught or ignored */
|
|
case LERROR:
|
|
case LSHELL:
|
|
if (interactive) {
|
|
if (i == LINTR)
|
|
shellf("\n");
|
|
/*
|
|
* Reset any eof that was read as part of a
|
|
* multiline command.
|
|
*/
|
|
if (Flag(FIGNOREEOF) && s->type == SEOF && wastty)
|
|
s->type = SSTDIN;
|
|
/*
|
|
* Used by exit command to get back to
|
|
* top level shell. Kind of strange since
|
|
* interactive is set if we are reading from
|
|
* a tty, but to have stopped jobs, one only
|
|
* needs FMONITOR set (not FTALKING/SF_TTY)...
|
|
*/
|
|
/* toss any input we have so far */
|
|
yyrecursive_pop(true);
|
|
s->start = s->str = null;
|
|
retrace_info = NULL;
|
|
herep = heres;
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case LEXIT:
|
|
case LLEAVE:
|
|
case LRETURN:
|
|
source = old_source;
|
|
quitenv(NULL);
|
|
/* keep on going */
|
|
unwind(i);
|
|
/* NOTREACHED */
|
|
default:
|
|
source = old_source;
|
|
quitenv(NULL);
|
|
internal_errorf("shell %d", i);
|
|
/* NOTREACHED */
|
|
}
|
|
while (/* CONSTCOND */ 1) {
|
|
if (trap)
|
|
runtraps(0);
|
|
|
|
if (s->next == NULL) {
|
|
if (Flag(FVERBOSE))
|
|
s->flags |= SF_ECHO;
|
|
else
|
|
s->flags &= ~SF_ECHO;
|
|
}
|
|
if (interactive) {
|
|
j_notify();
|
|
set_prompt(PS1, s);
|
|
}
|
|
t = compile(s, sfirst);
|
|
if (interactive)
|
|
histsave(&s->line, NULL, HIST_FLUSH, true);
|
|
sfirst = false;
|
|
if (!t)
|
|
goto source_no_tree;
|
|
if (t->type == TEOF) {
|
|
if (wastty && Flag(FIGNOREEOF) && --attempts > 0) {
|
|
shellf("Use 'exit' to leave mksh\n");
|
|
s->type = SSTDIN;
|
|
} else if (wastty && !really_exit &&
|
|
j_stopped_running()) {
|
|
really_exit = true;
|
|
s->type = SSTDIN;
|
|
} else {
|
|
/*
|
|
* this for POSIX which says EXIT traps
|
|
* shall be taken in the environment
|
|
* immediately after the last command
|
|
* executed.
|
|
*/
|
|
if (toplevel)
|
|
unwind(LEXIT);
|
|
break;
|
|
}
|
|
} else if ((s->flags & SF_MAYEXEC) && t->type == TCOM)
|
|
t->u.evalflags |= DOTCOMEXEC;
|
|
if (!Flag(FNOEXEC) || (s->flags & SF_TTY))
|
|
exstat = execute(t, 0, NULL) & 0xFF;
|
|
|
|
if (t->type != TEOF && interactive && really_exit)
|
|
really_exit = false;
|
|
|
|
source_no_tree:
|
|
reclaim();
|
|
}
|
|
quitenv(NULL);
|
|
source = old_source;
|
|
return (exstat & 0xFF);
|
|
}
|
|
|
|
/* return to closest error handler or shell(), exit if none found */
|
|
/* note: i MUST NOT be 0 */
|
|
void
|
|
unwind(int i)
|
|
{
|
|
/*
|
|
* This is a kludge. We need to restore everything that was
|
|
* changed in the new environment, see cid 1005090337C7A669439
|
|
* and 10050903386452ACBF1, but fail to even save things most of
|
|
* the time. funcs.c:c_eval() changes FERREXIT temporarily to 0,
|
|
* which needs to be restored thus (related to Debian #696823).
|
|
* We did not save the shell flags, so we use a special or'd
|
|
* value here... this is mostly to clean up behind *other*
|
|
* callers of unwind(LERROR) here; exec.c has the regular case.
|
|
*/
|
|
if (Flag(FERREXIT) & 0x80) {
|
|
/* GNU bash does not run this trapsig */
|
|
trapsig(ksh_SIGERR);
|
|
Flag(FERREXIT) &= ~0x80;
|
|
}
|
|
|
|
/* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */
|
|
if (i == LEXIT || ((i == LERROR || i == LINTR) &&
|
|
sigtraps[ksh_SIGEXIT].trap &&
|
|
(!Flag(FTALKING) || Flag(FERREXIT)))) {
|
|
++trap_nested;
|
|
runtrap(&sigtraps[ksh_SIGEXIT], trap_nested == 1);
|
|
--trap_nested;
|
|
i = LLEAVE;
|
|
} else if (Flag(FERREXIT) == 1 && (i == LERROR || i == LINTR)) {
|
|
++trap_nested;
|
|
runtrap(&sigtraps[ksh_SIGERR], trap_nested == 1);
|
|
--trap_nested;
|
|
i = LLEAVE;
|
|
}
|
|
|
|
while (/* CONSTCOND */ 1) {
|
|
switch (e->type) {
|
|
case E_PARSE:
|
|
case E_FUNC:
|
|
case E_INCL:
|
|
case E_LOOP:
|
|
case E_ERRH:
|
|
kshlongjmp(e->jbuf, i);
|
|
/* NOTREACHED */
|
|
case E_NONE:
|
|
if (i == LINTR)
|
|
e->flags |= EF_FAKE_SIGDIE;
|
|
/* FALLTHROUGH */
|
|
default:
|
|
quitenv(NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
newenv(int type)
|
|
{
|
|
struct env *ep;
|
|
char *cp;
|
|
|
|
/*
|
|
* struct env includes ALLOC_ITEM for alignment constraints
|
|
* so first get the actually used memory, then assign it
|
|
*/
|
|
cp = alloc(sizeof(struct env) - sizeof(ALLOC_ITEM), ATEMP);
|
|
/* undo what alloc() did to the malloc result address */
|
|
ep = (void *)(cp - sizeof(ALLOC_ITEM));
|
|
/* initialise public members of struct env (not the ALLOC_ITEM) */
|
|
ainit(&ep->area);
|
|
ep->oenv = e;
|
|
ep->loc = e->loc;
|
|
ep->savefd = NULL;
|
|
ep->temps = NULL;
|
|
ep->yyrecursive_statep = NULL;
|
|
ep->type = type;
|
|
ep->flags = 0;
|
|
/* jump buffer is invalid because flags == 0 */
|
|
e = ep;
|
|
}
|
|
|
|
void
|
|
quitenv(struct shf *shf)
|
|
{
|
|
struct env *ep = e;
|
|
char *cp;
|
|
int fd;
|
|
|
|
yyrecursive_pop(true);
|
|
while (ep->oenv && ep->oenv->loc != ep->loc)
|
|
popblock();
|
|
if (ep->savefd != NULL) {
|
|
for (fd = 0; fd < NUFILE; fd++)
|
|
/* if ep->savefd[fd] < 0, means fd was closed */
|
|
if (ep->savefd[fd])
|
|
restfd(fd, ep->savefd[fd]);
|
|
if (ep->savefd[2])
|
|
/* Clear any write errors */
|
|
shf_reopen(2, SHF_WR, shl_out);
|
|
}
|
|
/*
|
|
* Bottom of the stack.
|
|
* Either main shell is exiting or cleanup_parents_env() was called.
|
|
*/
|
|
if (ep->oenv == NULL) {
|
|
#ifdef DEBUG_LEAKS
|
|
int i;
|
|
#endif
|
|
|
|
if (ep->type == E_NONE) {
|
|
/* Main shell exiting? */
|
|
#if HAVE_PERSISTENT_HISTORY
|
|
if (Flag(FTALKING))
|
|
hist_finish();
|
|
#endif
|
|
j_exit();
|
|
if (ep->flags & EF_FAKE_SIGDIE) {
|
|
int sig = (exstat & 0xFF) - 128;
|
|
|
|
/*
|
|
* ham up our death a bit (AT&T ksh
|
|
* only seems to do this for SIGTERM)
|
|
* Don't do it for SIGQUIT, since we'd
|
|
* dump a core..
|
|
*/
|
|
if ((sig == SIGINT || sig == SIGTERM) &&
|
|
(kshpgrp == kshpid)) {
|
|
setsig(&sigtraps[sig], SIG_DFL,
|
|
SS_RESTORE_CURR | SS_FORCE);
|
|
kill(0, sig);
|
|
}
|
|
}
|
|
}
|
|
if (shf)
|
|
shf_close(shf);
|
|
reclaim();
|
|
#ifdef DEBUG_LEAKS
|
|
#ifndef MKSH_NO_CMDLINE_EDITING
|
|
x_done();
|
|
#endif
|
|
#ifndef MKSH_NOPROSPECTOFWORK
|
|
/* block at least SIGCHLD during/after afreeall */
|
|
sigprocmask(SIG_BLOCK, &sm_sigchld, NULL);
|
|
#endif
|
|
afreeall(APERM);
|
|
for (fd = 3; fd < NUFILE; fd++)
|
|
if ((i = fcntl(fd, F_GETFD, 0)) != -1 &&
|
|
(i & FD_CLOEXEC))
|
|
close(fd);
|
|
close(2);
|
|
close(1);
|
|
close(0);
|
|
#endif
|
|
exit(exstat & 0xFF);
|
|
}
|
|
if (shf)
|
|
shf_close(shf);
|
|
reclaim();
|
|
|
|
e = e->oenv;
|
|
|
|
/* free the struct env - tricky due to the ALLOC_ITEM inside */
|
|
cp = (void *)ep;
|
|
afree(cp + sizeof(ALLOC_ITEM), ATEMP);
|
|
}
|
|
|
|
/* Called after a fork to cleanup stuff left over from parents environment */
|
|
void
|
|
cleanup_parents_env(void)
|
|
{
|
|
struct env *ep;
|
|
int fd;
|
|
|
|
/*
|
|
* Don't clean up temporary files - parent will probably need them.
|
|
* Also, can't easily reclaim memory since variables, etc. could be
|
|
* anywhere.
|
|
*/
|
|
|
|
/* close all file descriptors hiding in savefd */
|
|
for (ep = e; ep; ep = ep->oenv) {
|
|
if (ep->savefd) {
|
|
for (fd = 0; fd < NUFILE; fd++)
|
|
if (ep->savefd[fd] > 0)
|
|
close(ep->savefd[fd]);
|
|
afree(ep->savefd, &ep->area);
|
|
ep->savefd = NULL;
|
|
}
|
|
#ifdef DEBUG_LEAKS
|
|
if (ep->type != E_NONE)
|
|
ep->type = E_GONE;
|
|
#endif
|
|
}
|
|
#ifndef DEBUG_LEAKS
|
|
e->oenv = NULL;
|
|
#endif
|
|
}
|
|
|
|
/* Called just before an execve cleanup stuff temporary files */
|
|
void
|
|
cleanup_proc_env(void)
|
|
{
|
|
struct env *ep;
|
|
|
|
for (ep = e; ep; ep = ep->oenv)
|
|
remove_temps(ep->temps);
|
|
}
|
|
|
|
/* remove temp files and free ATEMP Area */
|
|
static void
|
|
reclaim(void)
|
|
{
|
|
struct block *l;
|
|
|
|
while ((l = e->loc) && (!e->oenv || e->oenv->loc != l)) {
|
|
e->loc = l->next;
|
|
afreeall(&l->area);
|
|
}
|
|
|
|
remove_temps(e->temps);
|
|
e->temps = NULL;
|
|
|
|
/*
|
|
* if the memory backing source is reclaimed, things
|
|
* will end up badly when a function expecting it to
|
|
* be valid is run; a NULL pointer is easily debugged
|
|
*/
|
|
if (source && source->areap == &e->area)
|
|
source = NULL;
|
|
afreeall(&e->area);
|
|
}
|
|
|
|
static void
|
|
remove_temps(struct temp *tp)
|
|
{
|
|
while (tp) {
|
|
if (tp->pid == procpid)
|
|
unlink(tp->tffn);
|
|
tp = tp->next;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialise tty_fd. Used for tracking the size of the terminal,
|
|
* saving/resetting tty modes upon forground job completion, and
|
|
* for setting up the tty process group. Return values:
|
|
* 0 = got controlling tty
|
|
* 1 = got terminal but no controlling tty
|
|
* 2 = cannot find a terminal
|
|
* 3 = cannot dup fd
|
|
* 4 = cannot make fd close-on-exec
|
|
* An existing tty_fd is cached if no "better" one could be found,
|
|
* i.e. if tty_devtty was already set or the new would not set it.
|
|
*/
|
|
int
|
|
tty_init_fd(void)
|
|
{
|
|
int fd, rv, eno = 0;
|
|
bool do_close = false, is_devtty = true;
|
|
|
|
if (tty_devtty) {
|
|
/* already got a tty which is /dev/tty */
|
|
return (0);
|
|
}
|
|
|
|
#ifdef _UWIN
|
|
/*XXX imake style */
|
|
if (isatty(3)) {
|
|
/* fd 3 on UWIN _is_ /dev/tty (or our controlling tty) */
|
|
fd = 3;
|
|
goto got_fd;
|
|
}
|
|
#endif
|
|
if ((fd = open(T_devtty, O_RDWR, 0)) >= 0) {
|
|
do_close = true;
|
|
goto got_fd;
|
|
}
|
|
eno = errno;
|
|
|
|
if (tty_fd >= 0) {
|
|
/* already got a non-devtty one */
|
|
rv = 1;
|
|
goto out;
|
|
}
|
|
is_devtty = false;
|
|
|
|
if (isatty((fd = 0)) || isatty((fd = 2)))
|
|
goto got_fd;
|
|
/* cannot find one */
|
|
rv = 2;
|
|
/* assert: do_close == false */
|
|
goto out;
|
|
|
|
got_fd:
|
|
if ((rv = fcntl(fd, F_DUPFD, FDBASE)) < 0) {
|
|
eno = errno;
|
|
rv = 3;
|
|
goto out;
|
|
}
|
|
if (fcntl(rv, F_SETFD, FD_CLOEXEC) < 0) {
|
|
eno = errno;
|
|
close(rv);
|
|
rv = 4;
|
|
goto out;
|
|
}
|
|
tty_fd = rv;
|
|
tty_devtty = is_devtty;
|
|
rv = eno = 0;
|
|
out:
|
|
if (do_close)
|
|
close(fd);
|
|
errno = eno;
|
|
return (rv);
|
|
}
|
|
|
|
/* A shell error occurred (eg, syntax error, etc.) */
|
|
|
|
#define VWARNINGF_ERRORPREFIX 1
|
|
#define VWARNINGF_FILELINE 2
|
|
#define VWARNINGF_BUILTIN 4
|
|
#define VWARNINGF_INTERNAL 8
|
|
|
|
static void vwarningf(unsigned int, const char *, va_list)
|
|
MKSH_A_FORMAT(__printf__, 2, 0);
|
|
|
|
static void
|
|
vwarningf(unsigned int flags, const char *fmt, va_list ap)
|
|
{
|
|
if (fmt) {
|
|
if (flags & VWARNINGF_INTERNAL)
|
|
shf_fprintf(shl_out, Tf_sD_, "internal error");
|
|
if (flags & VWARNINGF_ERRORPREFIX)
|
|
error_prefix(tobool(flags & VWARNINGF_FILELINE));
|
|
if ((flags & VWARNINGF_BUILTIN) &&
|
|
/* not set when main() calls parse_args() */
|
|
builtin_argv0 && builtin_argv0 != kshname)
|
|
shf_fprintf(shl_out, Tf_sD_, builtin_argv0);
|
|
shf_vfprintf(shl_out, fmt, ap);
|
|
shf_putchar('\n', shl_out);
|
|
}
|
|
shf_flush(shl_out);
|
|
}
|
|
|
|
void
|
|
errorfx(int rc, const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
exstat = rc;
|
|
|
|
/* debugging: note that stdout not valid */
|
|
shl_stdout_ok = false;
|
|
|
|
va_start(va, fmt);
|
|
vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
|
|
va_end(va);
|
|
unwind(LERROR);
|
|
}
|
|
|
|
void
|
|
errorf(const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
exstat = 1;
|
|
|
|
/* debugging: note that stdout not valid */
|
|
shl_stdout_ok = false;
|
|
|
|
va_start(va, fmt);
|
|
vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE, fmt, va);
|
|
va_end(va);
|
|
unwind(LERROR);
|
|
}
|
|
|
|
/* like errorf(), but no unwind is done */
|
|
void
|
|
warningf(bool fileline, const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
va_start(va, fmt);
|
|
vwarningf(VWARNINGF_ERRORPREFIX | (fileline ? VWARNINGF_FILELINE : 0),
|
|
fmt, va);
|
|
va_end(va);
|
|
}
|
|
|
|
/*
|
|
* Used by built-in utilities to prefix shell and utility name to message
|
|
* (also unwinds environments for special builtins).
|
|
*/
|
|
void
|
|
bi_errorf(const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
/* debugging: note that stdout not valid */
|
|
shl_stdout_ok = false;
|
|
|
|
exstat = 1;
|
|
|
|
va_start(va, fmt);
|
|
vwarningf(VWARNINGF_ERRORPREFIX | VWARNINGF_FILELINE |
|
|
VWARNINGF_BUILTIN, fmt, va);
|
|
va_end(va);
|
|
|
|
/* POSIX special builtins cause non-interactive shells to exit */
|
|
if (builtin_spec) {
|
|
builtin_argv0 = NULL;
|
|
/* may not want to use LERROR here */
|
|
unwind(LERROR);
|
|
}
|
|
}
|
|
|
|
/* Called when something that shouldn't happen does */
|
|
void
|
|
internal_errorf(const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
va_start(va, fmt);
|
|
vwarningf(VWARNINGF_INTERNAL, fmt, va);
|
|
va_end(va);
|
|
unwind(LERROR);
|
|
}
|
|
|
|
void
|
|
internal_warningf(const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
va_start(va, fmt);
|
|
vwarningf(VWARNINGF_INTERNAL, fmt, va);
|
|
va_end(va);
|
|
}
|
|
|
|
/* used by error reporting functions to print "ksh: .kshrc[25]: " */
|
|
void
|
|
error_prefix(bool fileline)
|
|
{
|
|
/* Avoid foo: foo[2]: ... */
|
|
if (!fileline || !source || !source->file ||
|
|
strcmp(source->file, kshname) != 0)
|
|
shf_fprintf(shl_out, Tf_sD_, kshname + (*kshname == '-'));
|
|
if (fileline && source && source->file != NULL) {
|
|
shf_fprintf(shl_out, "%s[%lu]: ", source->file,
|
|
(unsigned long)(source->errline ?
|
|
source->errline : source->line));
|
|
source->errline = 0;
|
|
}
|
|
}
|
|
|
|
/* printf to shl_out (stderr) with flush */
|
|
void
|
|
shellf(const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
if (!initio_done)
|
|
/* shl_out may not be set up yet... */
|
|
return;
|
|
va_start(va, fmt);
|
|
shf_vfprintf(shl_out, fmt, va);
|
|
va_end(va);
|
|
shf_flush(shl_out);
|
|
}
|
|
|
|
/* printf to shl_stdout (stdout) */
|
|
void
|
|
shprintf(const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
if (!shl_stdout_ok)
|
|
internal_errorf("shl_stdout not valid");
|
|
va_start(va, fmt);
|
|
shf_vfprintf(shl_stdout, fmt, va);
|
|
va_end(va);
|
|
}
|
|
|
|
/* test if we can seek backwards fd (returns 0 or SHF_UNBUF) */
|
|
int
|
|
can_seek(int fd)
|
|
{
|
|
struct stat statb;
|
|
|
|
return (fstat(fd, &statb) == 0 && !S_ISREG(statb.st_mode) ?
|
|
SHF_UNBUF : 0);
|
|
}
|
|
|
|
#ifdef DF
|
|
int shl_dbg_fd;
|
|
#define NSHF_IOB 4
|
|
#else
|
|
#define NSHF_IOB 3
|
|
#endif
|
|
struct shf shf_iob[NSHF_IOB];
|
|
|
|
void
|
|
initio(void)
|
|
{
|
|
#ifdef DF
|
|
const char *lfp;
|
|
#endif
|
|
|
|
/* force buffer allocation */
|
|
shf_fdopen(1, SHF_WR, shl_stdout);
|
|
shf_fdopen(2, SHF_WR, shl_out);
|
|
shf_fdopen(2, SHF_WR, shl_xtrace);
|
|
#ifdef DF
|
|
if ((lfp = getenv("SDMKSH_PATH")) == NULL) {
|
|
if ((lfp = getenv("HOME")) == NULL || !mksh_abspath(lfp))
|
|
errorf("cannot get home directory");
|
|
lfp = shf_smprintf(Tf_sSs, lfp, "mksh-dbg.txt");
|
|
}
|
|
|
|
if ((shl_dbg_fd = open(lfp, O_WRONLY | O_APPEND | O_CREAT, 0600)) < 0)
|
|
errorf("cannot open debug output file %s", lfp);
|
|
if (shl_dbg_fd < FDBASE) {
|
|
int nfd;
|
|
|
|
nfd = fcntl(shl_dbg_fd, F_DUPFD, FDBASE);
|
|
close(shl_dbg_fd);
|
|
if ((shl_dbg_fd = nfd) == -1)
|
|
errorf("cannot dup debug output file");
|
|
}
|
|
fcntl(shl_dbg_fd, F_SETFD, FD_CLOEXEC);
|
|
shf_fdopen(shl_dbg_fd, SHF_WR, shl_dbg);
|
|
DF("=== open ===");
|
|
#endif
|
|
initio_done = true;
|
|
}
|
|
|
|
/* A dup2() with error checking */
|
|
int
|
|
ksh_dup2(int ofd, int nfd, bool errok)
|
|
{
|
|
int rv;
|
|
|
|
if (((rv = dup2(ofd, nfd)) < 0) && !errok && (errno != EBADF))
|
|
errorf("too many files open in shell");
|
|
|
|
#ifdef __ultrix
|
|
/*XXX imake style */
|
|
if (rv >= 0)
|
|
fcntl(nfd, F_SETFD, 0);
|
|
#endif
|
|
|
|
return (rv);
|
|
}
|
|
|
|
/*
|
|
* Move fd from user space (0 <= fd < 10) to shell space (fd >= 10),
|
|
* set close-on-exec flag. See FDBASE in sh.h, maybe 24 not 10 here.
|
|
*/
|
|
short
|
|
savefd(int fd)
|
|
{
|
|
int nfd = fd;
|
|
|
|
if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 &&
|
|
(errno == EBADF || errno == EPERM))
|
|
return (-1);
|
|
if (nfd < 0 || nfd > SHRT_MAX)
|
|
errorf("too many files open in shell");
|
|
fcntl(nfd, F_SETFD, FD_CLOEXEC);
|
|
return ((short)nfd);
|
|
}
|
|
|
|
void
|
|
restfd(int fd, int ofd)
|
|
{
|
|
if (fd == 2)
|
|
shf_flush(&shf_iob[/* fd */ 2]);
|
|
if (ofd < 0)
|
|
/* original fd closed */
|
|
close(fd);
|
|
else if (fd != ofd) {
|
|
/*XXX: what to do if this dup fails? */
|
|
ksh_dup2(ofd, fd, true);
|
|
close(ofd);
|
|
}
|
|
}
|
|
|
|
void
|
|
openpipe(int *pv)
|
|
{
|
|
int lpv[2];
|
|
|
|
if (pipe(lpv) < 0)
|
|
errorf("can't create pipe - try again");
|
|
pv[0] = savefd(lpv[0]);
|
|
if (pv[0] != lpv[0])
|
|
close(lpv[0]);
|
|
pv[1] = savefd(lpv[1]);
|
|
if (pv[1] != lpv[1])
|
|
close(lpv[1]);
|
|
}
|
|
|
|
void
|
|
closepipe(int *pv)
|
|
{
|
|
close(pv[0]);
|
|
close(pv[1]);
|
|
}
|
|
|
|
/*
|
|
* Called by iosetup() (deals with 2>&4, etc.), c_read, c_print to turn
|
|
* a string (the X in 2>&X, read -uX, print -uX) into a file descriptor.
|
|
*/
|
|
int
|
|
check_fd(const char *name, int mode, const char **emsgp)
|
|
{
|
|
int fd, fl;
|
|
|
|
if (!name[0] || name[1])
|
|
goto illegal_fd_name;
|
|
if (name[0] == 'p')
|
|
return (coproc_getfd(mode, emsgp));
|
|
if (!ksh_isdigit(name[0])) {
|
|
illegal_fd_name:
|
|
if (emsgp)
|
|
*emsgp = "illegal file descriptor name";
|
|
return (-1);
|
|
}
|
|
|
|
if ((fl = fcntl((fd = ksh_numdig(name[0])), F_GETFL, 0)) < 0) {
|
|
if (emsgp)
|
|
*emsgp = "bad file descriptor";
|
|
return (-1);
|
|
}
|
|
fl &= O_ACCMODE;
|
|
/*
|
|
* X_OK is a kludge to disable this check for dups (x<&1):
|
|
* historical shells never did this check (XXX don't know what
|
|
* POSIX has to say).
|
|
*/
|
|
if (!(mode & X_OK) && fl != O_RDWR && (
|
|
((mode & R_OK) && fl != O_RDONLY) ||
|
|
((mode & W_OK) && fl != O_WRONLY))) {
|
|
if (emsgp)
|
|
*emsgp = (fl == O_WRONLY) ?
|
|
"fd not open for reading" :
|
|
"fd not open for writing";
|
|
return (-1);
|
|
}
|
|
return (fd);
|
|
}
|
|
|
|
/* Called once from main */
|
|
void
|
|
coproc_init(void)
|
|
{
|
|
coproc.read = coproc.readw = coproc.write = -1;
|
|
coproc.njobs = 0;
|
|
coproc.id = 0;
|
|
}
|
|
|
|
/* Called by c_read() when eof is read - close fd if it is the co-process fd */
|
|
void
|
|
coproc_read_close(int fd)
|
|
{
|
|
if (coproc.read >= 0 && fd == coproc.read) {
|
|
coproc_readw_close(fd);
|
|
close(coproc.read);
|
|
coproc.read = -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called by c_read() and by iosetup() to close the other side of the
|
|
* read pipe, so reads will actually terminate.
|
|
*/
|
|
void
|
|
coproc_readw_close(int fd)
|
|
{
|
|
if (coproc.readw >= 0 && coproc.read >= 0 && fd == coproc.read) {
|
|
close(coproc.readw);
|
|
coproc.readw = -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called by c_print when a write to a fd fails with EPIPE and by iosetup
|
|
* when co-process input is dup'd
|
|
*/
|
|
void
|
|
coproc_write_close(int fd)
|
|
{
|
|
if (coproc.write >= 0 && fd == coproc.write) {
|
|
close(coproc.write);
|
|
coproc.write = -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called to check for existence of/value of the co-process file descriptor.
|
|
* (Used by check_fd() and by c_read/c_print to deal with -p option).
|
|
*/
|
|
int
|
|
coproc_getfd(int mode, const char **emsgp)
|
|
{
|
|
int fd = (mode & R_OK) ? coproc.read : coproc.write;
|
|
|
|
if (fd >= 0)
|
|
return (fd);
|
|
if (emsgp)
|
|
*emsgp = "no coprocess";
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* called to close file descriptors related to the coprocess (if any)
|
|
* Should be called with SIGCHLD blocked.
|
|
*/
|
|
void
|
|
coproc_cleanup(int reuse)
|
|
{
|
|
/* This to allow co-processes to share output pipe */
|
|
if (!reuse || coproc.readw < 0 || coproc.read < 0) {
|
|
if (coproc.read >= 0) {
|
|
close(coproc.read);
|
|
coproc.read = -1;
|
|
}
|
|
if (coproc.readw >= 0) {
|
|
close(coproc.readw);
|
|
coproc.readw = -1;
|
|
}
|
|
}
|
|
if (coproc.write >= 0) {
|
|
close(coproc.write);
|
|
coproc.write = -1;
|
|
}
|
|
}
|
|
|
|
struct temp *
|
|
maketemp(Area *ap, Temp_type type, struct temp **tlist)
|
|
{
|
|
char *cp;
|
|
size_t len;
|
|
int i, j;
|
|
struct temp *tp;
|
|
const char *dir;
|
|
struct stat sb;
|
|
|
|
dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR;
|
|
/* add "/shXXXXXX.tmp" plus NUL */
|
|
len = strlen(dir);
|
|
checkoktoadd(len, offsetof(struct temp, tffn[0]) + 14);
|
|
tp = alloc(offsetof(struct temp, tffn[0]) + 14 + len, ap);
|
|
|
|
tp->shf = NULL;
|
|
tp->pid = procpid;
|
|
tp->type = type;
|
|
|
|
if (stat(dir, &sb) || !S_ISDIR(sb.st_mode)) {
|
|
tp->tffn[0] = '\0';
|
|
goto maketemp_out;
|
|
}
|
|
|
|
cp = (void *)tp;
|
|
cp += offsetof(struct temp, tffn[0]);
|
|
memcpy(cp, dir, len);
|
|
cp += len;
|
|
memcpy(cp, "/shXXXXXX.tmp", 14);
|
|
/* point to the first of six Xes */
|
|
cp += 3;
|
|
|
|
/* cyclically attempt to open a temporary file */
|
|
do {
|
|
/* generate random part of filename */
|
|
len = 0;
|
|
do {
|
|
cp[len++] = digits_lc[rndget() % 36];
|
|
} while (len < 6);
|
|
|
|
/* check if this one works */
|
|
if ((i = binopen3(tp->tffn, O_CREAT | O_EXCL | O_RDWR,
|
|
0600)) < 0 && errno != EEXIST)
|
|
goto maketemp_out;
|
|
} while (i < 0);
|
|
|
|
if (type == TT_FUNSUB) {
|
|
/* map us high and mark as close-on-exec */
|
|
if ((j = savefd(i)) != i) {
|
|
close(i);
|
|
i = j;
|
|
}
|
|
|
|
/* operation mode for the shf */
|
|
j = SHF_RD;
|
|
} else
|
|
j = SHF_WR;
|
|
|
|
/* shf_fdopen cannot fail, so no fd leak */
|
|
tp->shf = shf_fdopen(i, j, NULL);
|
|
|
|
maketemp_out:
|
|
tp->next = *tlist;
|
|
*tlist = tp;
|
|
return (tp);
|
|
}
|
|
|
|
/*
|
|
* We use a similar collision resolution algorithm as Python 2.5.4
|
|
* but with a slightly tweaked implementation written from scratch.
|
|
*/
|
|
|
|
#define INIT_TBLSHIFT 3 /* initial table shift (2^3 = 8) */
|
|
#define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */
|
|
|
|
static void tgrow(struct table *);
|
|
static int tnamecmp(const void *, const void *);
|
|
|
|
static void
|
|
tgrow(struct table *tp)
|
|
{
|
|
size_t i, j, osize, mask, perturb;
|
|
struct tbl *tblp, **pp;
|
|
struct tbl **ntblp, **otblp = tp->tbls;
|
|
|
|
if (tp->tshift > 29)
|
|
internal_errorf("hash table size limit reached");
|
|
|
|
/* calculate old size, new shift and new size */
|
|
osize = (size_t)1 << (tp->tshift++);
|
|
i = osize << 1;
|
|
|
|
ntblp = alloc2(i, sizeof(struct tbl *), tp->areap);
|
|
/* multiplication cannot overflow: alloc2 checked that */
|
|
memset(ntblp, 0, i * sizeof(struct tbl *));
|
|
|
|
/* table can get very full when reaching its size limit */
|
|
tp->nfree = (tp->tshift == 30) ? 0x3FFF0000UL :
|
|
/* but otherwise, only 75% */
|
|
((i * 3) / 4);
|
|
tp->tbls = ntblp;
|
|
if (otblp == NULL)
|
|
return;
|
|
|
|
mask = i - 1;
|
|
for (i = 0; i < osize; i++)
|
|
if ((tblp = otblp[i]) != NULL) {
|
|
if ((tblp->flag & DEFINED)) {
|
|
/* search for free hash table slot */
|
|
j = perturb = tblp->ua.hval;
|
|
goto find_first_empty_slot;
|
|
find_next_empty_slot:
|
|
j = (j << 2) + j + perturb + 1;
|
|
perturb >>= PERTURB_SHIFT;
|
|
find_first_empty_slot:
|
|
pp = &ntblp[j & mask];
|
|
if (*pp != NULL)
|
|
goto find_next_empty_slot;
|
|
/* found an empty hash table slot */
|
|
*pp = tblp;
|
|
tp->nfree--;
|
|
} else if (!(tblp->flag & FINUSE)) {
|
|
afree(tblp, tp->areap);
|
|
}
|
|
}
|
|
afree(otblp, tp->areap);
|
|
}
|
|
|
|
void
|
|
ktinit(Area *ap, struct table *tp, uint8_t initshift)
|
|
{
|
|
tp->areap = ap;
|
|
tp->tbls = NULL;
|
|
tp->tshift = ((initshift > INIT_TBLSHIFT) ?
|
|
initshift : INIT_TBLSHIFT) - 1;
|
|
tgrow(tp);
|
|
}
|
|
|
|
/* table, name (key) to search for, hash(name), rv pointer to tbl ptr */
|
|
struct tbl *
|
|
ktscan(struct table *tp, const char *name, uint32_t h, struct tbl ***ppp)
|
|
{
|
|
size_t j, perturb, mask;
|
|
struct tbl **pp, *p;
|
|
|
|
mask = ((size_t)1 << (tp->tshift)) - 1;
|
|
/* search for hash table slot matching name */
|
|
j = perturb = h;
|
|
goto find_first_slot;
|
|
find_next_slot:
|
|
j = (j << 2) + j + perturb + 1;
|
|
perturb >>= PERTURB_SHIFT;
|
|
find_first_slot:
|
|
pp = &tp->tbls[j & mask];
|
|
if ((p = *pp) != NULL && (p->ua.hval != h || !(p->flag & DEFINED) ||
|
|
strcmp(p->name, name)))
|
|
goto find_next_slot;
|
|
/* p == NULL if not found, correct found entry otherwise */
|
|
if (ppp)
|
|
*ppp = pp;
|
|
return (p);
|
|
}
|
|
|
|
/* table, name (key) to enter, hash(n) */
|
|
struct tbl *
|
|
ktenter(struct table *tp, const char *n, uint32_t h)
|
|
{
|
|
struct tbl **pp, *p;
|
|
size_t len;
|
|
|
|
Search:
|
|
if ((p = ktscan(tp, n, h, &pp)))
|
|
return (p);
|
|
|
|
if (tp->nfree == 0) {
|
|
/* too full */
|
|
tgrow(tp);
|
|
goto Search;
|
|
}
|
|
|
|
/* create new tbl entry */
|
|
len = strlen(n);
|
|
checkoktoadd(len, offsetof(struct tbl, name[0]) + 1);
|
|
p = alloc(offsetof(struct tbl, name[0]) + ++len, tp->areap);
|
|
p->flag = 0;
|
|
p->type = 0;
|
|
p->areap = tp->areap;
|
|
p->ua.hval = h;
|
|
p->u2.field = 0;
|
|
p->u.array = NULL;
|
|
memcpy(p->name, n, len);
|
|
|
|
/* enter in tp->tbls */
|
|
tp->nfree--;
|
|
*pp = p;
|
|
return (p);
|
|
}
|
|
|
|
void
|
|
ktwalk(struct tstate *ts, struct table *tp)
|
|
{
|
|
ts->left = (size_t)1 << (tp->tshift);
|
|
ts->next = tp->tbls;
|
|
}
|
|
|
|
struct tbl *
|
|
ktnext(struct tstate *ts)
|
|
{
|
|
while (--ts->left >= 0) {
|
|
struct tbl *p = *ts->next++;
|
|
if (p != NULL && (p->flag & DEFINED))
|
|
return (p);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static int
|
|
tnamecmp(const void *p1, const void *p2)
|
|
{
|
|
const struct tbl *a = *((const struct tbl * const *)p1);
|
|
const struct tbl *b = *((const struct tbl * const *)p2);
|
|
|
|
return (strcmp(a->name, b->name));
|
|
}
|
|
|
|
struct tbl **
|
|
ktsort(struct table *tp)
|
|
{
|
|
size_t i;
|
|
struct tbl **p, **sp, **dp;
|
|
|
|
/*
|
|
* since the table is never entirely full, no need to reserve
|
|
* additional space for the trailing NULL appended below
|
|
*/
|
|
i = (size_t)1 << (tp->tshift);
|
|
p = alloc2(i, sizeof(struct tbl *), ATEMP);
|
|
sp = tp->tbls; /* source */
|
|
dp = p; /* dest */
|
|
while (i--)
|
|
if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
|
|
((*dp)->flag & ARRAY)))
|
|
dp++;
|
|
qsort(p, (i = dp - p), sizeof(struct tbl *), tnamecmp);
|
|
p[i] = NULL;
|
|
return (p);
|
|
}
|
|
|
|
#ifdef SIGWINCH
|
|
static void
|
|
x_sigwinch(int sig MKSH_A_UNUSED)
|
|
{
|
|
/* this runs inside interrupt context, with errno saved */
|
|
|
|
got_winch = 1;
|
|
}
|
|
#endif
|
|
|
|
#ifdef DF
|
|
void
|
|
DF(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
struct timeval tv;
|
|
mirtime_mjd mjd;
|
|
|
|
mksh_lockfd(shl_dbg_fd);
|
|
mksh_TIME(tv);
|
|
timet2mjd(&mjd, tv.tv_sec);
|
|
shf_fprintf(shl_dbg, "[%02u:%02u:%02u (%u) %u.%06u] ",
|
|
(unsigned)mjd.sec / 3600, ((unsigned)mjd.sec / 60) % 60,
|
|
(unsigned)mjd.sec % 60, (unsigned)getpid(),
|
|
(unsigned)tv.tv_sec, (unsigned)tv.tv_usec);
|
|
va_start(args, fmt);
|
|
shf_vfprintf(shl_dbg, fmt, args);
|
|
va_end(args);
|
|
shf_putc('\n', shl_dbg);
|
|
shf_flush(shl_dbg);
|
|
mksh_unlkfd(shl_dbg_fd);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
x_mkraw(int fd, mksh_ttyst *ocb, bool forread)
|
|
{
|
|
mksh_ttyst cb;
|
|
|
|
if (ocb)
|
|
mksh_tcget(fd, ocb);
|
|
else
|
|
ocb = &tty_state;
|
|
|
|
cb = *ocb;
|
|
if (forread) {
|
|
cb.c_iflag &= ~(ISTRIP);
|
|
cb.c_lflag &= ~(ICANON) | ECHO;
|
|
} else {
|
|
cb.c_iflag &= ~(INLCR | ICRNL | ISTRIP);
|
|
cb.c_lflag &= ~(ISIG | ICANON | ECHO);
|
|
}
|
|
#if defined(VLNEXT) && defined(_POSIX_VDISABLE)
|
|
/* OSF/1 processes lnext when ~icanon */
|
|
cb.c_cc[VLNEXT] = _POSIX_VDISABLE;
|
|
#endif
|
|
/* SunOS 4.1.x & OSF/1 processes discard(flush) when ~icanon */
|
|
#if defined(VDISCARD) && defined(_POSIX_VDISABLE)
|
|
cb.c_cc[VDISCARD] = _POSIX_VDISABLE;
|
|
#endif
|
|
cb.c_cc[VTIME] = 0;
|
|
cb.c_cc[VMIN] = 1;
|
|
|
|
mksh_tcset(fd, &cb);
|
|
}
|