1265 lines
27 KiB
C
1265 lines
27 KiB
C
/* $OpenBSD: main.c,v 1.41 2006/04/10 14:38:59 jaredy 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 1.12 2005/12/11 20:31:21 otto Exp $ */
|
|
|
|
#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 1.60 2006/11/12 10:44:41 tg Exp $");
|
|
|
|
extern char **environ;
|
|
|
|
static void reclaim(void);
|
|
static void remove_temps(struct temp *);
|
|
|
|
static const char initifs[] = "IFS= \t\n";
|
|
|
|
static const char initsubs[] = "${PS2=> } ${PS3=#? } ${PS4=+ }";
|
|
|
|
static const char *initcoms[] = {
|
|
"typeset", "-r", initvsn, NULL,
|
|
"typeset", "-x", "SHELL", "PATH", "HOME", NULL,
|
|
"typeset", "-i", "PPID", "OPTIND=1", NULL,
|
|
"eval", "typeset -i RANDOM SECONDS=\"${SECONDS-0}\" TMOUT=\"${TMOUT-0}\"", NULL,
|
|
"alias",
|
|
/* Standard ksh aliases */
|
|
"hash=alias -t", /* not "alias -t --": hash -r needs to work */
|
|
"type=whence -v",
|
|
"stop=kill -STOP",
|
|
"suspend=kill -STOP $$",
|
|
"autoload=typeset -fu",
|
|
"functions=typeset -f",
|
|
"history=fc -l",
|
|
"integer=typeset -i",
|
|
"nohup=nohup ",
|
|
"local=typeset",
|
|
"r=fc -e -",
|
|
/* Aliases that are builtin commands in at&t */
|
|
"login=exec login",
|
|
NULL,
|
|
/* this is what at&t ksh seems to track, with the addition of emacs */
|
|
"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;
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
int i;
|
|
int argi;
|
|
Source *s;
|
|
struct block *l;
|
|
int restricted, errexit;
|
|
char **wp;
|
|
struct env env;
|
|
pid_t ppid;
|
|
struct tbl *vp;
|
|
struct stat s_stdin;
|
|
#if !defined(_PATH_DEFPATH) && defined(_CS_PATH)
|
|
size_t k;
|
|
char *cp;
|
|
#endif
|
|
#if HAVE_SETLOCALE_CTYPE
|
|
const char *cc;
|
|
#endif
|
|
|
|
/* make sure argv[] is sane */
|
|
if (!*argv) {
|
|
static const char *empty_argv[] = {
|
|
"mksh", NULL
|
|
};
|
|
|
|
argv = (char **)empty_argv;
|
|
argc = 1;
|
|
}
|
|
kshname = *argv;
|
|
|
|
ainit(&aperm); /* initialize permanent Area */
|
|
|
|
/* set up base environment */
|
|
memset(&env, 0, sizeof(env));
|
|
env.type = E_NONE;
|
|
ainit(&env.area);
|
|
e = &env;
|
|
newblock(); /* set up global l->vars and l->funs */
|
|
|
|
/* Do this first so output routines (eg, errorf, shellf) can work */
|
|
initio();
|
|
|
|
argi = parse_args(argv, OF_FIRSTTIME, NULL);
|
|
if (argi < 0)
|
|
exit(1);
|
|
|
|
initvar();
|
|
|
|
initctypes();
|
|
|
|
inittraps();
|
|
|
|
coproc_init();
|
|
|
|
/* set up variable and command dictionaries */
|
|
ktinit(&taliases, APERM, 0);
|
|
ktinit(&aliases, APERM, 0);
|
|
ktinit(&homedirs, APERM, 0);
|
|
|
|
/* define shell keywords */
|
|
initkeywords();
|
|
|
|
/* define built-in commands */
|
|
ktinit(&builtins, APERM, 64); /* must be 2^n (currently 40 builtins) */
|
|
for (i = 0; shbuiltins[i].name != NULL; i++)
|
|
builtin(shbuiltins[i].name, shbuiltins[i].func);
|
|
for (i = 0; kshbuiltins[i].name != NULL; i++)
|
|
builtin(kshbuiltins[i].name, kshbuiltins[i].func);
|
|
|
|
init_histvec();
|
|
|
|
#ifdef _PATH_DEFPATH
|
|
def_path = _PATH_DEFPATH;
|
|
#else
|
|
#ifdef _CS_PATH
|
|
if ((len = confstr(_CS_PATH, NULL, 0)) != (size_t)-1 &&
|
|
len > 0 && confstr(_CS_PATH, new = alloc(len + 1, APERM),
|
|
len + 1) == len + 1)
|
|
def_path = new;
|
|
else
|
|
#endif
|
|
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);
|
|
Flag(FVITABCOMPLETE) = 1;
|
|
|
|
/* import environment */
|
|
if (environ != NULL)
|
|
for (wp = environ; *wp != NULL; wp++)
|
|
typeset(*wp, IMPORT | EXPORT, 0, 0, 0);
|
|
|
|
kshpid = procpid = getpid();
|
|
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 $PWD if it is valid */
|
|
if (pwd[0] != '/' ||
|
|
stat(pwd, &s_pwd) < 0 || stat(".", &s_dot) < 0 ||
|
|
s_pwd.st_dev != s_dot.st_dev ||
|
|
s_pwd.st_ino != s_dot.st_ino)
|
|
pwdx = NULL;
|
|
set_current_wd(pwdx);
|
|
if (current_wd[0])
|
|
simplify_path(current_wd);
|
|
/* Only set pwd if we know where we are or if it had a
|
|
* bogus value
|
|
*/
|
|
if (current_wd[0] || pwd != null)
|
|
/* setstr can't fail here */
|
|
setstr(pwd_v, current_wd, KSH_RETURN_ERROR);
|
|
}
|
|
ppid = getppid();
|
|
#if !HAVE_ARC4RANDOM
|
|
srand(((long)kshname) ^ ((long)time(NULL) * kshpid * ppid));
|
|
#endif
|
|
setint(global("PPID"), (long)ppid);
|
|
|
|
/* execute initialisation statements */
|
|
for (wp = (char **)initcoms; *wp != NULL; wp++) {
|
|
shcomexec(wp);
|
|
for (; *wp != NULL; wp++)
|
|
;
|
|
}
|
|
|
|
safe_prompt = (ksheuid = geteuid()) ? "$ " : "# ";
|
|
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);
|
|
|
|
/* Set this before parsing arguments */
|
|
Flag(FPRIVILEGED) = getuid() != ksheuid || getgid() != getegid();
|
|
|
|
/* this to note if monitor is set on command line (see below) */
|
|
Flag(FMONITOR) = 127;
|
|
argi = parse_args(argv, OF_CMDLINE, NULL);
|
|
if (argi < 0)
|
|
exit(1);
|
|
|
|
if (Flag(FCOMMAND)) {
|
|
s = pushs(SSTRING, ATEMP);
|
|
if (!(s->start = s->str = argv[argi++]))
|
|
errorf("-c requires an argument");
|
|
if (argv[argi])
|
|
kshname = argv[argi++];
|
|
} else if (argi < argc && !Flag(FSTDIN)) {
|
|
s = pushs(SFILE, ATEMP);
|
|
s->file = kshname = argv[argi++];
|
|
s->u.shf = shf_open(s->file, O_RDONLY, 0,
|
|
SHF_MAPHI | SHF_CLEXEC);
|
|
if (s->u.shf == NULL) {
|
|
exstat = 127; /* POSIX */
|
|
errorf("%s: %s", s->file, strerror(errno));
|
|
}
|
|
} 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);
|
|
|
|
/* initialize job control */
|
|
i = Flag(FMONITOR) != 127;
|
|
Flag(FMONITOR) = 0;
|
|
j_init(i);
|
|
/* Do this after j_init(), as tty_fd is not initialized 'til then */
|
|
if (Flag(FTALKING)) {
|
|
#if HAVE_SETLOCALE_CTYPE
|
|
/* Check if we're in a UTF-8 locale */
|
|
if (!Flag(FUTFHACK)) {
|
|
cc = setlocale(LC_CTYPE, "");
|
|
#if HAVE_LANGINFO_CODESET
|
|
if (strcasestr(cc, "UTF-8") && strcasestr(cc, "utf8"))
|
|
cc = nl_langinfo(CODESET);
|
|
#endif
|
|
Flag(FUTFHACK) = !(strcasestr(cc, "UTF-8") &&
|
|
strcasestr(cc, "utf8"));
|
|
}
|
|
#endif
|
|
x_init();
|
|
}
|
|
|
|
l = e->loc;
|
|
l->argv = &argv[argi - 1];
|
|
l->argc = argc - argi;
|
|
l->argv[0] = (char *)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/$ENV so that if it causes problems in them,
|
|
* user will know why things broke.
|
|
*/
|
|
if (!current_wd[0] && Flag(FTALKING))
|
|
warningf(false, "Cannot determine current working directory");
|
|
|
|
if (Flag(FLOGIN)) {
|
|
include(KSH_SYSTEM_PROFILE, 0, NULL, 1);
|
|
if (!Flag(FPRIVILEGED))
|
|
include(substitute("$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}", 0),
|
|
DOTILDE);
|
|
if (*env_file != '\0')
|
|
include(env_file, 0, NULL, 1);
|
|
}
|
|
|
|
if (restricted) {
|
|
static const char *const restr_com[] = {
|
|
"typeset", "-r", "PATH",
|
|
"ENV", "SHELL",
|
|
NULL
|
|
};
|
|
shcomexec((char **)restr_com);
|
|
/* After typeset command... */
|
|
Flag(FRESTRICTED) = 1;
|
|
}
|
|
if (errexit)
|
|
Flag(FERREXIT) = 1;
|
|
|
|
if (Flag(FTALKING)) {
|
|
hist_init(s);
|
|
alarm_init();
|
|
} else
|
|
Flag(FTRACKALL) = 1; /* set after ENV */
|
|
|
|
shell(s, true); /* doesn't return */
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
include(const char *name, int argc, char **argv, int intr_ok)
|
|
{
|
|
Source *volatile s = NULL;
|
|
struct shf *shf;
|
|
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;
|
|
/* FALLTHRU */
|
|
case LEXIT:
|
|
case LLEAVE:
|
|
case LSHELL:
|
|
unwind(i);
|
|
/* NOTREACHED */
|
|
default:
|
|
internal_errorf(1, "include: %d", i);
|
|
/* NOTREACHED */
|
|
}
|
|
}
|
|
if (argv) {
|
|
e->loc->argv = argv;
|
|
e->loc->argc = argc;
|
|
}
|
|
s = pushs(SFILE, ATEMP);
|
|
s->u.shf = shf;
|
|
s->file = str_save(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 */
|
|
}
|
|
|
|
int
|
|
command(const char *comm)
|
|
{
|
|
Source *s;
|
|
|
|
s = pushs(SSTRING, ATEMP);
|
|
s->start = s->str = comm;
|
|
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;
|
|
|
|
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(newline);
|
|
/* 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;
|
|
}
|
|
/* FALLTHRU */
|
|
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(1, "shell: %d", 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 ksh\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);
|
|
|
|
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)) {
|
|
runtrap(&sigtraps[SIGEXIT_]);
|
|
i = LLEAVE;
|
|
} else if (Flag(FERREXIT) && (i == LERROR || i == LINTR)) {
|
|
runtrap(&sigtraps[SIGERR_]);
|
|
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;
|
|
/* FALLTHRU */
|
|
default:
|
|
quitenv(NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
newenv(int type)
|
|
{
|
|
struct env *ep;
|
|
|
|
ep = (struct env *) alloc(sizeof(*ep), ATEMP);
|
|
ep->type = type;
|
|
ep->flags = 0;
|
|
ainit(&ep->area);
|
|
ep->loc = e->loc;
|
|
ep->savefd = NULL;
|
|
ep->oenv = e;
|
|
ep->temps = NULL;
|
|
e = ep;
|
|
}
|
|
|
|
void
|
|
quitenv(struct shf *shf)
|
|
{
|
|
struct env *ep = e;
|
|
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? */
|
|
#ifdef V_HISTFILE
|
|
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) &&
|
|
getpgrp() == 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;
|
|
afree(ep, 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;
|
|
}
|
|
}
|
|
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);
|
|
}
|
|
}
|
|
|
|
/* Initialize tty_fd. Used for saving/reseting tty modes upon
|
|
* foreground job completion and for setting up tty process group.
|
|
*/
|
|
void
|
|
tty_init(int init_ttystate)
|
|
{
|
|
int do_close = 1;
|
|
int tfd;
|
|
|
|
if (tty_fd >= 0) {
|
|
close(tty_fd);
|
|
tty_fd = -1;
|
|
}
|
|
tty_devtty = 1;
|
|
|
|
if ((tfd = open("/dev/tty", O_RDWR, 0)) < 0) {
|
|
tty_devtty = 0;
|
|
warningf(false, "No controlling tty (open /dev/tty: %s)",
|
|
strerror(errno));
|
|
}
|
|
if (tfd < 0) {
|
|
do_close = 0;
|
|
if (isatty(0))
|
|
tfd = 0;
|
|
else if (isatty(2))
|
|
tfd = 2;
|
|
else {
|
|
warningf(false, "Can't find tty file descriptor");
|
|
return;
|
|
}
|
|
}
|
|
if ((tty_fd = fcntl(tfd, F_DUPFD, FDBASE)) < 0) {
|
|
warningf(false, "j_ttyinit: dup of tty fd failed: %s",
|
|
strerror(errno));
|
|
} else if (fcntl(tty_fd, F_SETFD, FD_CLOEXEC) < 0) {
|
|
warningf(false, "j_ttyinit: can't set close-on-exec flag: %s",
|
|
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 = 0; /* debugging: note that stdout not valid */
|
|
exstat = 1;
|
|
if (*fmt) {
|
|
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 = 0; /* debugging: note that stdout not valid */
|
|
exstat = 1;
|
|
if (*fmt) {
|
|
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_errorf(int jump, const char *fmt, ...)
|
|
{
|
|
va_list va;
|
|
|
|
error_prefix(true);
|
|
shf_fprintf(shl_out, "internal error: ");
|
|
va_start(va, fmt);
|
|
shf_vfprintf(shl_out, fmt, va);
|
|
va_end(va);
|
|
shf_putchar('\n', shl_out);
|
|
shf_flush(shl_out);
|
|
if (jump)
|
|
unwind(LERROR);
|
|
}
|
|
|
|
/* 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(1, "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, int errok)
|
|
{
|
|
int ret = dup2(ofd, nfd);
|
|
|
|
if (ret < 0 && errno != EBADF && !errok)
|
|
errorf("too many files open in shell");
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* move fd from user space (0<=fd<10) to shell space (fd>=10),
|
|
* set close-on-exec flag.
|
|
*/
|
|
int
|
|
savefd(int fd)
|
|
{
|
|
int nfd;
|
|
|
|
if (fd < FDBASE) {
|
|
nfd = fcntl(fd, F_DUPFD, FDBASE);
|
|
if (nfd < 0) {
|
|
if (errno == EBADF)
|
|
return -1;
|
|
else
|
|
errorf("too many files open in shell");
|
|
}
|
|
} else
|
|
nfd = fd;
|
|
fcntl(nfd, F_SETFD, FD_CLOEXEC);
|
|
return 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(char *name, int mode, const char **emsgp)
|
|
{
|
|
int fd, fl;
|
|
|
|
if (ksh_isdigit(name[0]) && !name[1]) {
|
|
fd = name[0] - '0';
|
|
if ((fl = fcntl(fd = name[0] - '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;
|
|
} else if (name[0] == 'p' && !name[1])
|
|
return coproc_getfd(mode, emsgp);
|
|
if (emsgp)
|
|
*emsgp = "illegal file descriptor name";
|
|
return -1;
|
|
}
|
|
|
|
/* 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 : "/tmp";
|
|
len = strlen(dir) + 6 + 10 + 1;
|
|
tp = (struct temp *) alloc(sizeof(struct temp) + len, ap);
|
|
tp->name = pathname = (char *)&tp[1];
|
|
tp->shf = NULL;
|
|
tp->type = type;
|
|
shf_snprintf(pathname, len, "%s/mksh.XXXXXXXXXX", dir);
|
|
if ((fd = mkstemp(pathname)) >= 0)
|
|
tp->shf = shf_fdopen(fd, SHF_WR, NULL);
|
|
tp->pid = procpid;
|
|
|
|
tp->next = *tlist;
|
|
*tlist = tp;
|
|
return tp;
|
|
}
|
|
|
|
#define INIT_TBLS 8 /* initial table size (power of 2) */
|
|
|
|
static void texpand(struct table *, int);
|
|
static int tnamecmp(const void *, const void *);
|
|
|
|
unsigned int
|
|
hash(const char *n)
|
|
{
|
|
unsigned int h = 0;
|
|
|
|
while (*n != '\0')
|
|
h = 2*h + *n++;
|
|
return h * 32821; /* scatter bits */
|
|
}
|
|
|
|
void
|
|
ktinit(struct table *tp, Area *ap, int tsize)
|
|
{
|
|
tp->areap = ap;
|
|
tp->tbls = NULL;
|
|
tp->size = tp->nfree = 0;
|
|
if (tsize)
|
|
texpand(tp, tsize);
|
|
}
|
|
|
|
static void
|
|
texpand(struct table *tp, int nsize)
|
|
{
|
|
int i;
|
|
struct tbl *tblp, **p;
|
|
struct tbl **ntblp, **otblp = tp->tbls;
|
|
int osize = tp->size;
|
|
|
|
ntblp = (struct tbl **)alloc(sizeofN(struct tbl *, nsize), tp->areap);
|
|
for (i = 0; i < nsize; i++)
|
|
ntblp[i] = NULL;
|
|
tp->size = nsize;
|
|
tp->nfree = 8 * nsize / 10; /* table can get 80% full */
|
|
tp->tbls = ntblp;
|
|
if (otblp == NULL)
|
|
return;
|
|
for (i = 0; i < osize; i++)
|
|
if ((tblp = otblp[i]) != NULL) {
|
|
if ((tblp->flag & DEFINED)) {
|
|
for (p = &ntblp[hash(tblp->name) &
|
|
(tp->size - 1)]; *p != NULL; p--)
|
|
if (p == ntblp) /* wrap */
|
|
p += tp->size;
|
|
*p = tblp;
|
|
tp->nfree--;
|
|
} else if (!(tblp->flag & FINUSE)) {
|
|
afree((void *)tblp, tp->areap);
|
|
}
|
|
}
|
|
afree((void *)otblp, tp->areap);
|
|
}
|
|
|
|
/* table */
|
|
/* name to enter */
|
|
/* hash(n) */
|
|
struct tbl *
|
|
ktsearch(struct table *tp, const char *n, unsigned int h)
|
|
{
|
|
struct tbl **pp, *p;
|
|
|
|
if (tp->size == 0)
|
|
return NULL;
|
|
|
|
/* search for name in hashed table */
|
|
for (pp = &tp->tbls[h & (tp->size - 1)]; (p = *pp) != NULL; pp--) {
|
|
if (*p->name == *n && strcmp(p->name, n) == 0 &&
|
|
(p->flag & DEFINED))
|
|
return p;
|
|
if (pp == tp->tbls) /* wrap */
|
|
pp += tp->size;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* table */
|
|
/* name to enter */
|
|
/* hash(n) */
|
|
struct tbl *
|
|
ktenter(struct table *tp, const char *n, unsigned int h)
|
|
{
|
|
struct tbl **pp, *p;
|
|
int len;
|
|
|
|
if (tp->size == 0)
|
|
texpand(tp, INIT_TBLS);
|
|
Search:
|
|
/* search for name in hashed table */
|
|
for (pp = &tp->tbls[h & (tp->size - 1)]; (p = *pp) != NULL; pp--) {
|
|
if (*p->name == *n && strcmp(p->name, n) == 0)
|
|
return p; /* found */
|
|
if (pp == tp->tbls) /* wrap */
|
|
pp += tp->size;
|
|
}
|
|
|
|
if (tp->nfree <= 0) { /* too full */
|
|
texpand(tp, 2 * tp->size);
|
|
goto Search;
|
|
}
|
|
/* create new tbl entry */
|
|
len = strlen(n) + 1;
|
|
p = (struct tbl *)alloc(offsetof(struct tbl, name[0])+len,
|
|
tp->areap);
|
|
p->flag = 0;
|
|
p->type = 0;
|
|
p->areap = tp->areap;
|
|
p->u2.field = 0;
|
|
p->u.array = NULL;
|
|
memcpy(p->name, n, len);
|
|
|
|
/* enter in tp->tbls */
|
|
tp->nfree--;
|
|
*pp = p;
|
|
return p;
|
|
}
|
|
|
|
void
|
|
ktdelete(struct tbl *p)
|
|
{
|
|
p->flag = 0;
|
|
}
|
|
|
|
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 **)p1);
|
|
const struct tbl *b = *((const struct tbl **)p2);
|
|
|
|
return (strcmp(a->name, b->name));
|
|
}
|
|
|
|
struct tbl **
|
|
ktsort(struct table *tp)
|
|
{
|
|
size_t i;
|
|
struct tbl **p, **sp, **dp;
|
|
|
|
p = (struct tbl **)alloc(sizeofN(struct tbl *, tp->size + 1), ATEMP);
|
|
sp = tp->tbls; /* source */
|
|
dp = p; /* dest */
|
|
for (i = 0; i < (size_t)tp->size; 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;
|
|
}
|