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/* $OpenBSD: main.c,v 1.46 2010/05/19 17:36:08 jasper Exp $ */
/* $OpenBSD: tty.c,v 1.9 2006/03/14 22:08:01 deraadt Exp $ */
/* $OpenBSD: io.c,v 1.22 2006/03/17 16:30:13 millert Exp $ */
/* $OpenBSD: table.c,v 1.13 2009/01/17 22:06:44 millert Exp $ */
/*-
* Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
* Thorsten Glaser <tg@mirbsd.org>
*
* Provided that these terms and disclaimer and all copyright notices
* are retained or reproduced in an accompanying document, permission
* is granted to deal in this work without restriction, including un-
* limited rights to use, publicly perform, distribute, sell, modify,
* merge, give away, or sublicence.
*
* This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to
* the utmost extent permitted by applicable law, neither express nor
* implied; without malicious intent or gross negligence. In no event
* may a licensor, author or contributor be held liable for indirect,
* direct, other damage, loss, or other issues arising in any way out
* of dealing in the work, even if advised of the possibility of such
* damage or existence of a defect, except proven that it results out
* of said person's immediate fault when using the work as intended.
*/
#define EXTERN
#include "sh.h"
#if HAVE_LANGINFO_CODESET
#include <langinfo.h>
#endif
#if HAVE_SETLOCALE_CTYPE
#include <locale.h>
#endif
__RCSID("$MirOS: src/bin/mksh/main.c,v 1.175 2011/01/21 21:07:11 tg Exp $");
extern char **environ;
#ifndef MKSHRC_PATH
#define MKSHRC_PATH "~/.mkshrc"
#endif
#ifndef MKSH_DEFAULT_TMPDIR
#define MKSH_DEFAULT_TMPDIR "/tmp"
#endif
void chvt_reinit(void);
static void reclaim(void);
static void remove_temps(struct temp *);
static mksh_uari_t rndsetup(void);
#ifdef SIGWINCH
static void x_sigwinch(int);
#endif
static const char initifs[] = "IFS= \t\n";
static const char initsubs[] =
"${PS2=> } ${PS3=#? } ${PS4=+ } ${SECONDS=0} ${TMOUT=0}";
static const char *initcoms[] = {
T_typeset, "-r", initvsn, NULL,
T_typeset, "-x", "HOME", "PATH", "RANDOM", "SHELL", NULL,
T_typeset, "-i10", "COLUMNS", "KSHEGID", "KSHGID", "KSHUID", "LINES",
"OPTIND", "PGRP", "PPID", "RANDOM", "SECONDS", "TMOUT", "USER_ID",
NULL,
T_alias,
"integer=typeset -i",
T_local_typeset,
"hash=alias -t", /* not "alias -t --": hash -r needs to work */
"type=whence -v",
#if !defined(ANDROID) && !defined(MKSH_UNEMPLOYED)
/* not in Android for political reasons */
/* not in ARGE mksh due to no job control */
"stop=kill -STOP",
"suspend=kill -STOP $$",
#endif
"autoload=typeset -fu",
"functions=typeset -f",
"history=fc -l",
"nameref=typeset -n",
"nohup=nohup ",
T_r_fc_e_,
"source=PATH=$PATH:. command .",
"login=exec login",
NULL,
/* this is what AT&T ksh seems to track, with the addition of emacs */
T_alias, "-tU",
"cat", "cc", "chmod", "cp", "date", "ed", "emacs", "grep", "ls",
"make", "mv", "pr", "rm", "sed", "sh", "vi", "who", NULL,
NULL
};
static int initio_done;
/* top-level parsing and execution environment */
static struct env env;
struct env *e = &env;
static mksh_uari_t
rndsetup(void)
{
register uint32_t h;
struct {
ALLOC_ITEM __alloc_i;
void *dataptr, *stkptr, *mallocptr;
sigjmp_buf jbuf;
struct timeval tv;
struct timezone tz;
} *bufptr;
char *cp;
cp = alloc(sizeof(*bufptr) - ALLOC_SIZE, APERM);
bufptr = (void *)(cp - ALLOC_SIZE); /* undo what alloc() did */
bufptr->dataptr = &rndsetupstate; /* PIE or something */
bufptr->stkptr = &bufptr; /* ASLR in Win/Lin */
bufptr->mallocptr = bufptr; /* randomised malloc in BSD */
sigsetjmp(bufptr->jbuf, 1); /* glibc pointer guard */
gettimeofday(&bufptr->tv, &bufptr->tz); /* introduce variation */
oaat1_init_impl(h);
/* variation through pid, ppid, and the works */
oaat1_addmem_impl(h, &rndsetupstate, sizeof(rndsetupstate));
/* some variation, some possibly entropy, depending on OE */
oaat1_addmem_impl(h, bufptr, sizeof(*bufptr));
oaat1_fini_impl(h);
afree(cp, APERM);
return ((mksh_uari_t)h);
}
void
chvt_reinit(void)
{
kshpid = procpid = getpid();
ksheuid = geteuid();
kshpgrp = getpgrp();
kshppid = getppid();
}
int
main(int argc, const char *argv[])
{
int argi, i;
Source *s;
struct block *l;
unsigned char restricted, errexit, utf_flag;
const char **wp;
struct tbl *vp;
struct stat s_stdin;
#if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
ssize_t k;
char *cp;
#endif
/* do things like getpgrp() et al. */
chvt_reinit();
/* make sure argv[] is sane */
if (!*argv) {
static const char *empty_argv[] = {
"mksh", NULL
};
argv = empty_argv;
argc = 1;
}
kshname = *argv;
ainit(&aperm); /* initialise permanent Area */
/* set up base environment */
env.type = E_NONE;
ainit(&env.area);
/* set up global l->vars and l->funs */
newblock();
/* Do this first so output routines (eg, errorf, shellf) can work */
initio();
argi = parse_args(argv, OF_FIRSTTIME, NULL);
if (argi < 0)
return (1);
initvar();
initctypes();
inittraps();
coproc_init();
/* set up variable and command dictionaries */
ktinit(&taliases, APERM, 0);
ktinit(&aliases, APERM, 0);
#ifndef MKSH_NOPWNAM
ktinit(&homedirs, APERM, 0);
#endif
/* define shell keywords */
initkeywords();
/* define built-in commands */
ktinit(&builtins, APERM,
/* must be 80% of 2^n (currently 44 builtins) */ 64);
for (i = 0; mkshbuiltins[i].name != NULL; i++)
builtin(mkshbuiltins[i].name, mkshbuiltins[i].func);
init_histvec();
#ifdef _PATH_DEFPATH
def_path = _PATH_DEFPATH;
#else
#ifdef _CS_PATH
if ((k = confstr(_CS_PATH, NULL, 0)) > 0 &&
confstr(_CS_PATH, cp = alloc(k + 1, APERM), k + 1) == k + 1)
def_path = cp;
else
#endif
/*
* this is uniform across all OSes unless it
* breaks somewhere; don't try to optimise,
* e.g. add stuff for Interix or remove /usr
* for HURD, because e.g. Debian GNU/HURD is
* "keeping a regular /usr"; this is supposed
* to be a sane 'basic' default PATH
*/
def_path = "/bin:/usr/bin:/sbin:/usr/sbin";
#endif
/*
* Set PATH to def_path (will set the path global variable).
* (import of environment below will probably change this setting).
*/
vp = global("PATH");
/* setstr can't fail here */
setstr(vp, def_path, KSH_RETURN_ERROR);
/*
* Turn on nohup by default for now - will change to off
* by default once people are aware of its existence
* (AT&T ksh does not have a nohup option - it always sends
* the hup).
*/
Flag(FNOHUP) = 1;
/*
* Turn on brace expansion by default. AT&T kshs that have
* alternation always have it on.
*/
Flag(FBRACEEXPAND) = 1;
/*
* Set edit mode to emacs by default, may be overridden
* by the environment or the user. Also, we want tab completion
* on in vi by default.
*/
change_flag(FEMACS, OF_SPECIAL, 1);
#if !MKSH_S_NOVI
Flag(FVITABCOMPLETE) = 1;
#endif
#ifdef MKSH_BINSHREDUCED
/* set FSH if we're called as -sh or /bin/sh or so */
{
const char *cc;
cc = kshname;
i = 0; argi = 0;
while (cc[i] != '\0')
/* the following line matches '-' and '/' ;-) */
if ((cc[i++] | 2) == '/')
argi = i;
if (((cc[argi] | 0x20) == 's') && ((cc[argi + 1] | 0x20) == 'h'))
change_flag(FSH, OF_FIRSTTIME, 1);
}
#endif
/* import environment */
if (environ != NULL)
for (wp = (const char **)environ; *wp != NULL; wp++)
typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
typeset(initifs, 0, 0, 0, 0); /* for security */
/* assign default shell variable values */
substitute(initsubs, 0);
/* Figure out the current working directory and set $PWD */
{
struct stat s_pwd, s_dot;
struct tbl *pwd_v = global("PWD");
char *pwd = str_val(pwd_v);
char *pwdx = pwd;
/* Try to use existing $PWD if it is valid */
if (pwd[0] != '/' ||
stat(pwd, &s_pwd) < 0 || stat(".", &s_dot) < 0 ||
s_pwd.st_dev != s_dot.st_dev ||
s_pwd.st_ino != s_dot.st_ino)
pwdx = NULL;
set_current_wd(pwdx);
if (current_wd[0])
simplify_path(current_wd);
/*
* Only set pwd if we know where we are or if it had a
* bogus value
*/
if (current_wd[0] || pwd != null)
/* setstr can't fail here */
setstr(pwd_v, current_wd, KSH_RETURN_ERROR);
}
for (wp = initcoms; *wp != NULL; wp++) {
shcomexec(wp);
while (*wp != NULL)
wp++;
}
setint(global("COLUMNS"), 0);
setint(global("LINES"), 0);
setint(global("OPTIND"), 1);
kshuid = getuid();
kshgid = getgid();
kshegid = getegid();
safe_prompt = ksheuid ? "$ " : "# ";
vp = global("PS1");
/* Set PS1 if unset or we are root and prompt doesn't contain a # */
if (!(vp->flag & ISSET) ||
(!ksheuid && !strchr(str_val(vp), '#')))
/* setstr can't fail here */
setstr(vp, safe_prompt, KSH_RETURN_ERROR);
setint((vp = global("PGRP")), (mksh_uari_t)kshpgrp);
vp->flag |= INT_U;
setint((vp = global("PPID")), (mksh_uari_t)kshppid);
vp->flag |= INT_U;
setint((vp = global("USER_ID")), (mksh_uari_t)ksheuid);
vp->flag |= INT_U;
setint((vp = global("KSHUID")), (mksh_uari_t)kshuid);
vp->flag |= INT_U;
setint((vp = global("KSHEGID")), (mksh_uari_t)kshegid);
vp->flag |= INT_U;
setint((vp = global("KSHGID")), (mksh_uari_t)kshgid);
vp->flag |= INT_U;
setint((vp = global("RANDOM")), rndsetup());
vp->flag |= INT_U;
/* Set this before parsing arguments */
Flag(FPRIVILEGED) = kshuid != ksheuid || kshgid != kshegid;
/* this to note if monitor is set on command line (see below) */
#ifndef MKSH_UNEMPLOYED
Flag(FMONITOR) = 127;
#endif
/* this to note if utf-8 mode is set on command line (see below) */
UTFMODE = 2;
argi = parse_args(argv, OF_CMDLINE, NULL);
if (argi < 0)
return (1);
/* process this later only, default to off (hysterical raisins) */
utf_flag = UTFMODE;
UTFMODE = 0;
if (Flag(FCOMMAND)) {
s = pushs(SSTRING, ATEMP);
if (!(s->start = s->str = argv[argi++]))
errorf("%s %s", "-c", "requires an argument");
#ifdef MKSH_MIDNIGHTBSD01ASH_COMPAT
/* compatibility to MidnightBSD 0.1 /bin/sh (kludge) */
if (Flag(FSH) && argv[argi] && !strcmp(argv[argi], "--"))
++argi;
#endif
if (argv[argi])
kshname = argv[argi++];
} else if (argi < argc && !Flag(FSTDIN)) {
s = pushs(SFILE, ATEMP);
s->file = argv[argi++];
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, "%s: %s", s->file, strerror(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();
/* set: 0/1; unset: 2->0 */
UTFMODE = utf_flag & 1;
/* Do this after j_init(), as tty_fd is not initialised until then */
if (Flag(FTALKING)) {
if (utf_flag == 2) {
#ifndef MKSH_ASSUME_UTF8
#define isuc(x) (((x) != NULL) && \
(stristr((x), "UTF-8") || stristr((x), "utf8")))
/* Check if we're in a UTF-8 locale */
const char *ccp;
#if HAVE_SETLOCALE_CTYPE
ccp = setlocale(LC_CTYPE, "");
#if HAVE_LANGINFO_CODESET
if (!isuc(ccp))
ccp = nl_langinfo(CODESET);
#endif
#else
/* these were imported from environ earlier */
ccp = str_val(global("LC_ALL"));
if (ccp == null)
ccp = str_val(global("LC_CTYPE"));
if (ccp == null)
ccp = str_val(global("LANG"));
#endif
UTFMODE = isuc(ccp);
#undef isuc
#elif MKSH_ASSUME_UTF8
UTFMODE = 1;
#else
UTFMODE = 0;
#endif
}
x_init();
}
#ifdef SIGWINCH
sigtraps[SIGWINCH].flags |= TF_SHELL_USES;
setsig(&sigtraps[SIGWINCH], x_sigwinch,
SS_RESTORE_ORIG|SS_FORCE|SS_SHTRAP);
#endif
l = e->loc;
l->argv = &argv[argi - 1];
l->argc = argc - argi;
l->argv[0] = kshname;
getopts_reset(1);
/* Disable during .profile/ENV reading */
restricted = Flag(FRESTRICTED);
Flag(FRESTRICTED) = 0;
errexit = Flag(FERREXIT);
Flag(FERREXIT) = 0;
/*
* Do this before profile/$ENV so that if it causes problems in them,
* user will know why things broke.
*/
if (!current_wd[0] && Flag(FTALKING))
warningf(false, "can't determine current directory");
if (Flag(FLOGIN)) {
include(KSH_SYSTEM_PROFILE, 0, NULL, 1);
if (!Flag(FPRIVILEGED))
include(substitute("$HOME/.profile", 0), 0,
NULL, 1);
}
if (Flag(FPRIVILEGED))
include("/etc/suid_profile", 0, NULL, 1);
else if (Flag(FTALKING)) {
char *env_file;
/* include $ENV */
env_file = substitute(substitute("${ENV:-" MKSHRC_PATH "}", 0),
DOTILDE);
if (*env_file != '\0')
include(env_file, 0, NULL, 1);
}
if (restricted) {
static const char *restr_com[] = {
T_typeset, "-r", "PATH",
"ENV", "SHELL",
NULL
};
shcomexec(restr_com);
/* After typeset command... */
Flag(FRESTRICTED) = 1;
}
Flag(FERREXIT) = errexit;
if (Flag(FTALKING)) {
hist_init(s);
alarm_init();
} else
Flag(FTRACKALL) = 1; /* set after ENV */
/* doesn't return */
shell(s, true);
return (0);
}
int
include(const char *name, int argc, const char **argv, int 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);
i = sigsetjmp(e->jbuf, 0);
if (i) {
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:
return (exstat & 0xff); /* see below */
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 - 128) != SIGTERM)
return (1);
/* FALLTHROUGH */
case LEXIT:
case LLEAVE:
case LSHELL:
unwind(i);
/* NOTREACHED */
default:
internal_errorf("%s %d", "include", 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;
}
return (i & 0xff); /* & 0xff to ensure value not -1 */
}
/* spawn a command into a shell optionally keeping track of the line number */
int
command(const char *comm, int line)
{
Source *s;
s = pushs(SSTRING, ATEMP);
s->start = s->str = comm;
s->line = line;
return (shell(s, false));
}
/*
* run the commands from the input source, returning status.
*/
int
shell(Source * volatile s, volatile int toplevel)
{
struct op *t;
volatile int wastty = s->flags & SF_TTY;
volatile int attempts = 13;
volatile int interactive = Flag(FTALKING) && toplevel;
Source *volatile old_source = source;
int i;
s->flags |= SF_FIRST; /* enable UTF-8 BOM check */
newenv(E_PARSE);
if (interactive)
really_exit = 0;
i = sigsetjmp(e->jbuf, 0);
if (i) {
switch (i) {
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 */
s->start = s->str = null;
break;
}
/* FALLTHROUGH */
case LEXIT:
case LLEAVE:
case LRETURN:
source = old_source;
quitenv(NULL);
unwind(i); /* keep on going */
/* NOTREACHED */
default:
source = old_source;
quitenv(NULL);
internal_errorf("%s %d", "shell", i);
/* NOTREACHED */
}
}
while (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);
if (t != NULL && 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 = 1;
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;
}
}
if (t && (!Flag(FNOEXEC) || (s->flags & SF_TTY)))
exstat = execute(t, 0, NULL);
if (t != NULL && t->type != TEOF && interactive && really_exit)
really_exit = 0;
reclaim();
}
quitenv(NULL);
source = old_source;
return (exstat);
}
/* return to closest error handler or shell(), exit if none found */
void
unwind(int i)
{
/* ordering for EXIT vs ERR is a bit odd (this is what AT&T ksh does) */
if (i == LEXIT || (Flag(FERREXIT) && (i == LERROR || i == LINTR) &&
sigtraps[SIGEXIT_].trap)) {
++trap_nested;
runtrap(&sigtraps[SIGEXIT_], trap_nested == 1);
--trap_nested;
i = LLEAVE;
} else if (Flag(FERREXIT) && (i == LERROR || i == LINTR)) {
++trap_nested;
runtrap(&sigtraps[SIGERR_], trap_nested == 1);
--trap_nested;
i = LLEAVE;
}
while (1) {
switch (e->type) {
case E_PARSE:
case E_FUNC:
case E_INCL:
case E_LOOP:
case E_ERRH:
siglongjmp(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) - ALLOC_SIZE, ATEMP);
ep = (void *)(cp - ALLOC_SIZE); /* undo what alloc() did */
/* 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->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;
if (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) {
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 - 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();
exit(exstat);
}
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 + ALLOC_SIZE, ATEMP);
}
/* Called after a fork to cleanup stuff left over from parents environment */
void
cleanup_parents_env(void)
{
struct env *ep;
int fd;
mkssert(e != NULL);
/*
* 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;
}
}
e->oenv = NULL;
}
/* 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)
{
remove_temps(e->temps);
e->temps = NULL;
afreeall(&e->area);
}
static void
remove_temps(struct temp *tp)
{
for (; tp != NULL; tp = tp->next)
if (tp->pid == procpid)
unlink(tp->name);
}
/*
* Initialise tty_fd. Used for saving/reseting tty modes upon
* foreground job completion and for setting up tty process group.
*/
void
tty_init(bool init_ttystate, bool need_tty)
{
bool do_close = true;
int tfd;
if (tty_fd >= 0) {
close(tty_fd);
tty_fd = -1;
}
tty_devtty = 1;
#ifdef _UWIN
/* XXX imake style */
if (isatty(3))
tfd = 3;
else
#endif
if ((tfd = open("/dev/tty", O_RDWR, 0)) < 0) {
tty_devtty = 0;
if (need_tty)
warningf(false, "%s: %s %s: %s",
"No controlling tty", "open", "/dev/tty",
strerror(errno));
}
if (tfd < 0) {
do_close = false;
if (isatty(0))
tfd = 0;
else if (isatty(2))
tfd = 2;
else {
if (need_tty)
warningf(false, "can't find tty fd");
return;
}
}
if ((tty_fd = fcntl(tfd, F_DUPFD, FDBASE)) < 0) {
if (need_tty)
warningf(false, "%s: %s %s: %s", "j_ttyinit",
"dup of tty fd", "failed", strerror(errno));
} else if (fcntl(tty_fd, F_SETFD, FD_CLOEXEC) < 0) {
if (need_tty)
warningf(false, "%s: %s: %s", "j_ttyinit",
"can't set close-on-exec flag", strerror(errno));
close(tty_fd);
tty_fd = -1;
} else if (init_ttystate)
tcgetattr(tty_fd, &tty_state);
if (do_close)
close(tfd);
}
void
tty_close(void)
{
if (tty_fd >= 0) {
close(tty_fd);
tty_fd = -1;
}
}
/* A shell error occurred (eg, syntax error, etc.) */
void
errorf(const char *fmt, ...)
{
va_list va;
shl_stdout_ok = false; /* debugging: note that stdout not valid */
exstat = 1;
if (*fmt != 1) {
error_prefix(true);
va_start(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
}
shf_flush(shl_out);
unwind(LERROR);
}
/* like errorf(), but no unwind is done */
void
warningf(bool fileline, const char *fmt, ...)
{
va_list va;
error_prefix(fileline);
va_start(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
shf_flush(shl_out);
}
/*
* 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;
shl_stdout_ok = false; /* debugging: note that stdout not valid */
exstat = 1;
if (*fmt != 1) {
error_prefix(true);
/* not set when main() calls parse_args() */
if (builtin_argv0)
shf_fprintf(shl_out, "%s: ", builtin_argv0);
va_start(va, fmt);
shf_vfprintf(shl_out, fmt, va);
va_end(va);
shf_putchar('\n', shl_out);
}
shf_flush(shl_out);
/*
* POSIX special builtins and ksh special builtins cause
* non-interactive shells to exit.
* XXX odd use of KEEPASN; also may not want LERROR here
*/
if (builtin_flag & SPEC_BI) {
builtin_argv0 = NULL;
unwind(LERROR);
}
}
/* Called when something that shouldn't happen does */
void
internal_verrorf(const char *fmt, va_list ap)
{
shf_fprintf(shl_out, "internal error: ");
shf_vfprintf(shl_out, fmt, ap);
shf_putchar('\n', shl_out);
shf_flush(shl_out);
}
void
internal_errorf(const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
internal_verrorf(fmt, va);
va_end(va);
unwind(LERROR);
}
void
internal_warningf(const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
internal_verrorf(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, "%s: ", kshname + (*kshname == '-'));
if (fileline && source && source->file != NULL) {
shf_fprintf(shl_out, "%s[%d]: ", source->file,
source->errline > 0 ? 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);
}
struct shf shf_iob[3];
void
initio(void)
{
shf_fdopen(1, SHF_WR, shl_stdout); /* force buffer allocation */
shf_fdopen(2, SHF_WR, shl_out);
shf_fdopen(2, SHF_WR, shl_spare); /* force buffer allocation */
initio_done = 1;
}
/* 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.
*/
short
savefd(int fd)
{
int nfd = fd;
if (fd < FDBASE && (nfd = fcntl(fd, F_DUPFD, FDBASE)) < 0 &&
errno == EBADF)
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]);
if (ofd < 0) /* original fd closed */
close(fd);
else if (fd != ofd) {
ksh_dup2(ofd, fd, true); /* XXX: what to do if this fails? */
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] == 'p' && !name[1])
return (coproc_getfd(mode, emsgp));
for (fd = 0; ksh_isdigit(*name); ++name)
fd = (fd * 10) + *name - '0';
if (*name || fd >= FDBASE) {
if (emsgp)
*emsgp = "illegal file descriptor name";
return (-1);
}
if ((fl = fcntl(fd, 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)
{
struct temp *tp;
int len;
int fd;
char *pathname;
const char *dir;
dir = tmpdir ? tmpdir : MKSH_DEFAULT_TMPDIR;
#if HAVE_MKSTEMP
len = strlen(dir) + 6 + 10 + 1;
#else
pathname = tempnam(dir, "mksh.");
len = ((pathname == NULL) ? 0 : strlen(pathname)) + 1;
#endif
/* reasonably sure that this will not overflow */
tp = alloc(sizeof(struct temp) + len, ap);
tp->name = (char *)&tp[1];
#if !HAVE_MKSTEMP
if (pathname == NULL)
tp->name[0] = '\0';
else {
memcpy(tp->name, pathname, len);
free(pathname);
}
#endif
pathname = tp->name;
tp->shf = NULL;
tp->type = type;
#if HAVE_MKSTEMP
shf_snprintf(pathname, len, "%s%s", dir, "/mksh.XXXXXXXXXX");
if ((fd = mkstemp(pathname)) >= 0)
#else
if (tp->name[0] && (fd = open(tp->name, O_CREAT | O_RDWR, 0600)) >= 0)
#endif
tp->shf = shf_fdopen(fd, SHF_WR, NULL);
tp->pid = procpid;
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_TBLS 8 /* initial table size (power of 2) */
#define PERTURB_SHIFT 5 /* see Python 2.5.4 Objects/dictobject.c */
static void texpand(struct table *, size_t);
static int tnamecmp(const void *, const void *);
static struct tbl *ktscan(struct table *, const char *, uint32_t,
struct tbl ***);
static void
texpand(struct table *tp, size_t nsize)
{
size_t i, j, osize = tp->size, perturb;
struct tbl *tblp, **pp;
struct tbl **ntblp, **otblp = tp->tbls;
ntblp = alloc2(nsize, sizeof(struct tbl *), tp->areap);
for (i = 0; i < nsize; i++)
ntblp[i] = NULL;
tp->size = nsize;
tp->nfree = (nsize * 4) / 5; /* table can get 80% full */
tp->tbls = ntblp;
if (otblp == NULL)
return;
nsize--; /* from here on nsize := mask */
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) & nsize;
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 & nsize];
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(struct table *tp, Area *ap, size_t tsize)
{
tp->areap = ap;
tp->tbls = NULL;
tp->size = tp->nfree = 0;
if (tsize)
texpand(tp, tsize);
}
/* table, name (key) to search for, hash(name), rv pointer to tbl ptr */
static 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 = tp->size - 1;
/* search for hash table slot matching name */
j = (perturb = h) & mask;
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 search for, hash(n) */
struct tbl *
ktsearch(struct table *tp, const char *n, uint32_t h)
{
return (tp->size ? ktscan(tp, n, h, NULL) : NULL);
}
/* 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;
if (tp->size == 0)
texpand(tp, INIT_TBLS);
Search:
if ((p = ktscan(tp, n, h, &pp)))
return (p);
if (tp->nfree <= 0) {
/* too full */
texpand(tp, 2 * tp->size);
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 = tp->size;
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;
/* tp->size + 1 will not overflow */
p = alloc2(tp->size + 1, sizeof(struct tbl *), ATEMP);
sp = tp->tbls; /* source */
dp = p; /* dest */
i = (size_t)tp->size;
while (i--)
if ((*dp = *sp++) != NULL && (((*dp)->flag & DEFINED) ||
((*dp)->flag & ARRAY)))
dp++;
qsort(p, (i = dp - p), sizeof(void *), 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
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