e8ed7c888d
that when traps are marked as invalid, we never use them for anything except output from the trap command. Fixes issues where sub-shells of shells which use traps (eg: to trap SIGPIPE) can end up looping forever if the signal occurs in a sub-shell (where the trap is supposed to be reset to its default). Reported, and mostly analyzed by Martijn Dekker.
838 lines
17 KiB
C
838 lines
17 KiB
C
/* $NetBSD: trap.c,v 1.51 2019/01/18 06:28:09 kre Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Kenneth Almquist.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)trap.c 8.5 (Berkeley) 6/5/95";
|
|
#else
|
|
__RCSID("$NetBSD: trap.c,v 1.51 2019/01/18 06:28:09 kre Exp $");
|
|
#endif
|
|
#endif /* not lint */
|
|
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <termios.h>
|
|
|
|
#undef CEOF /* from <termios.h> but concflicts with sh use */
|
|
|
|
#include <sys/ioctl.h>
|
|
#include <sys/resource.h>
|
|
|
|
#include "shell.h"
|
|
#include "main.h"
|
|
#include "nodes.h" /* for other headers */
|
|
#include "eval.h"
|
|
#include "jobs.h"
|
|
#include "show.h"
|
|
#include "options.h"
|
|
#include "builtins.h"
|
|
#include "syntax.h"
|
|
#include "output.h"
|
|
#include "memalloc.h"
|
|
#include "error.h"
|
|
#include "trap.h"
|
|
#include "mystring.h"
|
|
#include "var.h"
|
|
|
|
|
|
/*
|
|
* Sigmode records the current value of the signal handlers for the various
|
|
* modes. A value of zero means that the current handler is not known.
|
|
* S_HARD_IGN indicates that the signal was ignored on entry to the shell,
|
|
*/
|
|
|
|
#define S_DFL 1 /* default signal handling (SIG_DFL) */
|
|
#define S_CATCH 2 /* signal is caught */
|
|
#define S_IGN 3 /* signal is ignored (SIG_IGN) */
|
|
#define S_HARD_IGN 4 /* signal is ignored permenantly */
|
|
#define S_RESET 5 /* temporary - to reset a hard ignored sig */
|
|
|
|
|
|
MKINIT char sigmode[NSIG]; /* current value of signal */
|
|
static volatile sig_atomic_t gotsig[NSIG];/* indicates specified signal received */
|
|
volatile sig_atomic_t pendingsigs; /* indicates some signal received */
|
|
|
|
int traps_invalid; /* in a subshell, but trap[] not yet cleared */
|
|
static char * volatile trap[NSIG]; /* trap handler commands */
|
|
static int in_dotrap;
|
|
static int last_trapsig;
|
|
|
|
static int exiting; /* exitshell() has been done */
|
|
static int exiting_status; /* the status to use for exit() */
|
|
|
|
static int getsigaction(int, sig_t *);
|
|
STATIC const char *trap_signame(int);
|
|
void printsignals(struct output *, int);
|
|
|
|
/*
|
|
* return the signal number described by `p' (as a number or a name)
|
|
* or -1 if it isn't one
|
|
*/
|
|
|
|
static int
|
|
signame_to_signum(const char *p)
|
|
{
|
|
int i;
|
|
|
|
if (is_number(p))
|
|
return number(p);
|
|
|
|
if (strcasecmp(p, "exit") == 0 )
|
|
return 0;
|
|
|
|
i = signalnumber(p);
|
|
if (i == 0)
|
|
i = -1;
|
|
return i;
|
|
}
|
|
|
|
/*
|
|
* return the name of a signal used by the "trap" command
|
|
*/
|
|
STATIC const char *
|
|
trap_signame(int signo)
|
|
{
|
|
static char nbuf[12];
|
|
const char *p;
|
|
|
|
if (signo == 0)
|
|
return "EXIT";
|
|
p = signalname(signo);
|
|
if (p != NULL)
|
|
return p;
|
|
(void)snprintf(nbuf, sizeof nbuf, "%d", signo);
|
|
return nbuf;
|
|
}
|
|
|
|
#ifdef SMALL
|
|
/*
|
|
* Print a list of valid signal names
|
|
*/
|
|
void
|
|
printsignals(struct output *out, int len)
|
|
{
|
|
int n;
|
|
|
|
if (len != 0)
|
|
outc(' ', out);
|
|
for (n = 1; n < NSIG; n++) {
|
|
outfmt(out, "%s", trap_signame(n));
|
|
if ((n == NSIG/2) || n == (NSIG - 1))
|
|
outstr("\n", out);
|
|
else
|
|
outc(' ', out);
|
|
}
|
|
}
|
|
#else /* !SMALL */
|
|
/*
|
|
* Print the names of all the signals (neatly) to fp
|
|
* "len" gives the number of chars already printed to
|
|
* the current output line (in kill.c, always 0)
|
|
*/
|
|
void
|
|
printsignals(struct output *out, int len)
|
|
{
|
|
int sig;
|
|
int nl, pad;
|
|
const char *name;
|
|
int termwidth = 80;
|
|
|
|
if ((name = bltinlookup("COLUMNS", 1)) != NULL)
|
|
termwidth = (int)strtol(name, NULL, 10);
|
|
else if (isatty(1)) {
|
|
struct winsize win;
|
|
|
|
if (ioctl(1, TIOCGWINSZ, &win) == 0 && win.ws_col > 0)
|
|
termwidth = win.ws_col;
|
|
}
|
|
|
|
if (posix)
|
|
pad = 1;
|
|
else
|
|
pad = (len | 7) + 1 - len;
|
|
|
|
for (sig = 0; (sig = signalnext(sig)) != 0; ) {
|
|
name = signalname(sig);
|
|
if (name == NULL)
|
|
continue;
|
|
|
|
nl = strlen(name);
|
|
|
|
if (len > 0 && nl + len + pad >= termwidth) {
|
|
outc('\n', out);
|
|
len = 0;
|
|
pad = 0;
|
|
} else if (pad > 0 && len != 0)
|
|
outfmt(out, "%*s", pad, "");
|
|
else
|
|
pad = 0;
|
|
|
|
len += nl + pad;
|
|
if (!posix)
|
|
pad = (nl | 7) + 1 - nl;
|
|
else
|
|
pad = 1;
|
|
|
|
outstr(name, out);
|
|
}
|
|
if (len != 0)
|
|
outc('\n', out);
|
|
}
|
|
#endif /* SMALL */
|
|
|
|
/*
|
|
* The trap builtin.
|
|
*/
|
|
|
|
int
|
|
trapcmd(int argc, char **argv)
|
|
{
|
|
char *action;
|
|
char **ap;
|
|
int signo;
|
|
int errs = 0;
|
|
int printonly = 0;
|
|
|
|
ap = argv + 1;
|
|
|
|
CTRACE(DBG_TRAP, ("trapcmd: "));
|
|
if (argc == 2 && strcmp(*ap, "-l") == 0) {
|
|
CTRACE(DBG_TRAP, ("-l\n"));
|
|
out1str("EXIT");
|
|
printsignals(out1, 4);
|
|
return 0;
|
|
}
|
|
if (argc == 2 && strcmp(*ap, "-") == 0) {
|
|
CTRACE(DBG_TRAP, ("-\n"));
|
|
for (signo = 0; signo < NSIG; signo++) {
|
|
if (trap[signo] == NULL)
|
|
continue;
|
|
INTOFF;
|
|
ckfree(trap[signo]);
|
|
trap[signo] = NULL;
|
|
if (signo != 0)
|
|
setsignal(signo, 0);
|
|
INTON;
|
|
}
|
|
traps_invalid = 0;
|
|
return 0;
|
|
}
|
|
if (argc >= 2 && strcmp(*ap, "-p") == 0) {
|
|
CTRACE(DBG_TRAP, ("-p "));
|
|
printonly = 1;
|
|
ap++;
|
|
argc--;
|
|
}
|
|
|
|
if (argc > 1 && strcmp(*ap, "--") == 0) {
|
|
argc--;
|
|
ap++;
|
|
}
|
|
|
|
if (argc <= 1) {
|
|
int count;
|
|
|
|
CTRACE(DBG_TRAP, ("*all*\n"));
|
|
if (printonly) {
|
|
for (count = 0, signo = 0 ; signo < NSIG ; signo++)
|
|
if (trap[signo] == NULL) {
|
|
if (count == 0)
|
|
out1str("trap -- -");
|
|
out1fmt(" %s", trap_signame(signo));
|
|
/* oh! unlucky 13 */
|
|
if (++count >= 13) {
|
|
out1str("\n");
|
|
count = 0;
|
|
}
|
|
}
|
|
if (count)
|
|
out1str("\n");
|
|
}
|
|
|
|
for (count = 0, signo = 0 ; signo < NSIG ; signo++)
|
|
if (trap[signo] != NULL && trap[signo][0] == '\0') {
|
|
if (count == 0)
|
|
out1str("trap -- ''");
|
|
out1fmt(" %s", trap_signame(signo));
|
|
/*
|
|
* the prefix is 10 bytes, with 4 byte
|
|
* signal names (common) we have room in
|
|
* the 70 bytes left on a normal line for
|
|
* 70/(4+1) signals, that's 14, but to
|
|
* allow for the occasional longer sig name
|
|
* we output one less...
|
|
*/
|
|
if (++count >= 13) {
|
|
out1str("\n");
|
|
count = 0;
|
|
}
|
|
}
|
|
if (count)
|
|
out1str("\n");
|
|
|
|
for (signo = 0 ; signo < NSIG ; signo++)
|
|
if (trap[signo] != NULL && trap[signo][0] != '\0') {
|
|
out1str("trap -- ");
|
|
print_quoted(trap[signo]);
|
|
out1fmt(" %s\n", trap_signame(signo));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
CTRACE(DBG_TRAP, ("\n"));
|
|
|
|
action = NULL;
|
|
|
|
if (!printonly && traps_invalid)
|
|
free_traps();
|
|
|
|
if (!printonly && !is_number(*ap)) {
|
|
if ((*ap)[0] == '-' && (*ap)[1] == '\0')
|
|
ap++; /* reset to default */
|
|
else
|
|
action = *ap++; /* can be '' for "ignore" */
|
|
argc--;
|
|
}
|
|
|
|
if (argc < 2) { /* there must be at least 1 condition */
|
|
out2str("Usage: trap [-l]\n"
|
|
" trap -p [condition ...]\n"
|
|
" trap action condition ...\n"
|
|
" trap N condition ...\n");
|
|
return 2;
|
|
}
|
|
|
|
|
|
while (*ap) {
|
|
signo = signame_to_signum(*ap);
|
|
|
|
if (signo < 0 || signo >= NSIG) {
|
|
/* This is not a fatal error, so sayeth posix */
|
|
outfmt(out2, "trap: '%s' bad condition\n", *ap);
|
|
errs = 1;
|
|
ap++;
|
|
continue;
|
|
}
|
|
ap++;
|
|
|
|
if (printonly) {
|
|
out1str("trap -- ");
|
|
if (trap[signo] == NULL)
|
|
out1str("-");
|
|
else
|
|
print_quoted(trap[signo]);
|
|
out1fmt(" %s\n", trap_signame(signo));
|
|
continue;
|
|
}
|
|
|
|
INTOFF;
|
|
if (action)
|
|
action = savestr(action);
|
|
|
|
VTRACE(DBG_TRAP, ("trap for %d from %s%s%s to %s%s%s\n", signo,
|
|
trap[signo] ? "'" : "", trap[signo] ? trap[signo] : "-",
|
|
trap[signo] ? "'" : "", action ? "'" : "",
|
|
action ? action : "-", action ? "'" : ""));
|
|
|
|
if (trap[signo])
|
|
ckfree(trap[signo]);
|
|
|
|
trap[signo] = action;
|
|
|
|
if (signo != 0)
|
|
setsignal(signo, 0);
|
|
INTON;
|
|
}
|
|
return errs;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Clear traps on a fork or vfork.
|
|
* Takes one arg vfork, to tell it to not be destructive of
|
|
* the parents variables.
|
|
*/
|
|
void
|
|
clear_traps(int vforked)
|
|
{
|
|
char * volatile *tp;
|
|
|
|
VTRACE(DBG_TRAP, ("clear_traps(%d)\n", vforked));
|
|
if (!vforked)
|
|
traps_invalid = 1;
|
|
|
|
for (tp = &trap[1] ; tp < &trap[NSIG] ; tp++) {
|
|
if (*tp && **tp) { /* trap not NULL or SIG_IGN */
|
|
INTOFF;
|
|
setsignal(tp - trap, vforked == 1);
|
|
INTON;
|
|
}
|
|
}
|
|
if (vforked == 2)
|
|
free_traps();
|
|
}
|
|
|
|
void
|
|
free_traps(void)
|
|
{
|
|
char * volatile *tp;
|
|
|
|
VTRACE(DBG_TRAP, ("free_traps%s\n", traps_invalid ? "(invalid)" : ""));
|
|
INTOFF;
|
|
for (tp = trap ; tp < &trap[NSIG] ; tp++)
|
|
if (*tp && **tp) {
|
|
ckfree(*tp);
|
|
*tp = NULL;
|
|
}
|
|
traps_invalid = 0;
|
|
INTON;
|
|
}
|
|
|
|
/*
|
|
* See if there are any defined traps
|
|
*/
|
|
int
|
|
have_traps(void)
|
|
{
|
|
char * volatile *tp;
|
|
|
|
if (traps_invalid)
|
|
return 0;
|
|
|
|
for (tp = trap ; tp < &trap[NSIG] ; tp++)
|
|
if (*tp && **tp) /* trap not NULL or SIG_IGN */
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set the signal handler for the specified signal. The routine figures
|
|
* out what it should be set to.
|
|
*/
|
|
void
|
|
setsignal(int signo, int vforked)
|
|
{
|
|
int action;
|
|
sig_t sigact = SIG_DFL, sig;
|
|
char *t, tsig;
|
|
|
|
if (traps_invalid || (t = trap[signo]) == NULL)
|
|
action = S_DFL;
|
|
else if (*t != '\0')
|
|
action = S_CATCH;
|
|
else
|
|
action = S_IGN;
|
|
|
|
VTRACE(DBG_TRAP, ("setsignal(%d%s) -> %d", signo,
|
|
vforked ? ", VF" : "", action));
|
|
if (rootshell && !vforked && action == S_DFL) {
|
|
switch (signo) {
|
|
case SIGINT:
|
|
if (iflag || minusc || sflag == 0)
|
|
action = S_CATCH;
|
|
break;
|
|
case SIGQUIT:
|
|
#ifdef DEBUG
|
|
if (debug)
|
|
break;
|
|
#endif
|
|
/* FALLTHROUGH */
|
|
case SIGTERM:
|
|
if (rootshell && iflag)
|
|
action = S_IGN;
|
|
break;
|
|
#if JOBS
|
|
case SIGTSTP:
|
|
case SIGTTOU:
|
|
if (rootshell && mflag)
|
|
action = S_IGN;
|
|
break;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Never let users futz with SIGCHLD
|
|
* instead we will give them pseudo SIGCHLD's
|
|
* when background jobs complete.
|
|
*/
|
|
if (signo == SIGCHLD)
|
|
action = S_DFL;
|
|
|
|
VTRACE(DBG_TRAP, (" -> %d", action));
|
|
|
|
t = &sigmode[signo];
|
|
tsig = *t;
|
|
if (tsig == 0) {
|
|
/*
|
|
* current setting unknown
|
|
*/
|
|
if (!getsigaction(signo, &sigact)) {
|
|
/*
|
|
* Pretend it worked; maybe we should give a warning
|
|
* here, but other shells don't. We don't alter
|
|
* sigmode, so that we retry every time.
|
|
*/
|
|
VTRACE(DBG_TRAP, (" getsigaction (%d)\n", errno));
|
|
return;
|
|
}
|
|
VTRACE(DBG_TRAP, (" [%s]%s%s", sigact==SIG_IGN ? "IGN" :
|
|
sigact==SIG_DFL ? "DFL" : "caught",
|
|
iflag ? "i" : "", mflag ? "m" : ""));
|
|
|
|
if (sigact == SIG_IGN) {
|
|
/*
|
|
* POSIX 3.14.13 states that non-interactive shells
|
|
* should ignore trap commands for signals that were
|
|
* ignored upon entry, and leaves the behavior
|
|
* unspecified for interactive shells. On interactive
|
|
* shells, or if job control is on, and we have a job
|
|
* control related signal, we allow the trap to work.
|
|
*
|
|
* This change allows us to be POSIX compliant, and
|
|
* at the same time override the default behavior if
|
|
* we need to by setting the interactive flag.
|
|
*/
|
|
if ((mflag && (signo == SIGTSTP ||
|
|
signo == SIGTTIN || signo == SIGTTOU)) || iflag) {
|
|
tsig = S_IGN;
|
|
} else
|
|
tsig = S_HARD_IGN;
|
|
} else {
|
|
tsig = S_RESET; /* force to be set */
|
|
}
|
|
}
|
|
VTRACE(DBG_TRAP, (" tsig=%d\n", tsig));
|
|
|
|
if (tsig == S_HARD_IGN || tsig == action)
|
|
return;
|
|
|
|
switch (action) {
|
|
case S_DFL: sigact = SIG_DFL; break;
|
|
case S_CATCH: sigact = onsig; break;
|
|
case S_IGN: sigact = SIG_IGN; break;
|
|
}
|
|
|
|
sig = signal(signo, sigact);
|
|
|
|
if (sig != SIG_ERR) {
|
|
sigset_t ss;
|
|
|
|
if (!vforked)
|
|
*t = action;
|
|
|
|
if (action == S_CATCH)
|
|
(void)siginterrupt(signo, 1);
|
|
/*
|
|
* If our parent accidentally blocked signals for
|
|
* us make sure we unblock them
|
|
*/
|
|
(void)sigemptyset(&ss);
|
|
(void)sigaddset(&ss, signo);
|
|
(void)sigprocmask(SIG_UNBLOCK, &ss, NULL);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Return the current setting for sig w/o changing it.
|
|
*/
|
|
static int
|
|
getsigaction(int signo, sig_t *sigact)
|
|
{
|
|
struct sigaction sa;
|
|
|
|
if (sigaction(signo, (struct sigaction *)0, &sa) == -1)
|
|
return 0;
|
|
*sigact = (sig_t) sa.sa_handler;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Ignore a signal.
|
|
*/
|
|
|
|
void
|
|
ignoresig(int signo, int vforked)
|
|
{
|
|
if (sigmode[signo] == 0)
|
|
setsignal(signo, vforked);
|
|
|
|
VTRACE(DBG_TRAP, ("ignoresig(%d%s)\n", signo, vforked ? ", VF" : ""));
|
|
if (sigmode[signo] != S_IGN && sigmode[signo] != S_HARD_IGN) {
|
|
signal(signo, SIG_IGN);
|
|
if (!vforked)
|
|
sigmode[signo] = S_IGN;
|
|
}
|
|
}
|
|
|
|
char *
|
|
child_trap(void)
|
|
{
|
|
char * p;
|
|
|
|
p = trap[SIGCHLD];
|
|
|
|
if (traps_invalid || (p != NULL && *p == '\0'))
|
|
p = NULL;
|
|
|
|
return p;
|
|
}
|
|
|
|
|
|
#ifdef mkinit
|
|
INCLUDE <signal.h>
|
|
INCLUDE "trap.h"
|
|
INCLUDE "shell.h"
|
|
INCLUDE "show.h"
|
|
|
|
SHELLPROC {
|
|
char *sm;
|
|
|
|
INTOFF;
|
|
clear_traps(2);
|
|
for (sm = sigmode ; sm < sigmode + NSIG ; sm++) {
|
|
if (*sm == S_IGN) {
|
|
*sm = S_HARD_IGN;
|
|
VTRACE(DBG_TRAP, ("SHELLPROC: %d -> hard_ign\n",
|
|
(sm - sigmode)));
|
|
}
|
|
}
|
|
INTON;
|
|
}
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
* Signal handler.
|
|
*/
|
|
|
|
void
|
|
onsig(int signo)
|
|
{
|
|
CTRACE(DBG_SIG, ("Signal %d, had: pending %d, gotsig[%d]=%d\n",
|
|
signo, pendingsigs, signo, gotsig[signo]));
|
|
|
|
/* This should not be needed.
|
|
signal(signo, onsig);
|
|
*/
|
|
|
|
if (signo == SIGINT && (traps_invalid || trap[SIGINT] == NULL)) {
|
|
onint();
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* if the signal will do nothing, no point reporting it
|
|
*/
|
|
if (!traps_invalid && trap[signo] != NULL && trap[signo][0] != '\0' &&
|
|
signo != SIGCHLD) {
|
|
gotsig[signo] = 1;
|
|
pendingsigs++;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Called to execute a trap. Perhaps we should avoid entering new trap
|
|
* handlers while we are executing a trap handler.
|
|
*/
|
|
|
|
void
|
|
dotrap(void)
|
|
{
|
|
int i;
|
|
char *tr;
|
|
int savestatus;
|
|
struct skipsave saveskip;
|
|
|
|
in_dotrap++;
|
|
|
|
CTRACE(DBG_TRAP, ("dotrap[%d]: %d pending, traps %sinvalid\n",
|
|
in_dotrap, pendingsigs, traps_invalid ? "" : "not "));
|
|
for (;;) {
|
|
pendingsigs = 0;
|
|
for (i = 1 ; ; i++) {
|
|
if (i >= NSIG)
|
|
return;
|
|
if (gotsig[i])
|
|
break;
|
|
}
|
|
gotsig[i] = 0;
|
|
|
|
if (traps_invalid)
|
|
continue;
|
|
|
|
tr = trap[i];
|
|
|
|
CTRACE(DBG_TRAP|DBG_SIG, ("dotrap %d: %s%s%s\n", i,
|
|
tr ? "\"" : "", tr ? tr : "NULL", tr ? "\"" : ""));
|
|
|
|
if (tr != NULL) {
|
|
last_trapsig = i;
|
|
save_skipstate(&saveskip);
|
|
savestatus = exitstatus;
|
|
|
|
tr = savestr(tr); /* trap code may free trap[i] */
|
|
evalstring(tr, 0);
|
|
ckfree(tr);
|
|
|
|
if (current_skipstate() == SKIPNONE ||
|
|
saveskip.state != SKIPNONE) {
|
|
restore_skipstate(&saveskip);
|
|
exitstatus = savestatus;
|
|
}
|
|
}
|
|
}
|
|
|
|
in_dotrap--;
|
|
}
|
|
|
|
int
|
|
lastsig(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = NSIG; --i > 0; )
|
|
if (gotsig[i])
|
|
return i;
|
|
return SIGINT; /* XXX */
|
|
}
|
|
|
|
/*
|
|
* Controls whether the shell is interactive or not.
|
|
*/
|
|
|
|
|
|
void
|
|
setinteractive(int on)
|
|
{
|
|
static int is_interactive;
|
|
|
|
if (on == is_interactive)
|
|
return;
|
|
setsignal(SIGINT, 0);
|
|
setsignal(SIGQUIT, 0);
|
|
setsignal(SIGTERM, 0);
|
|
is_interactive = on;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Called to exit the shell.
|
|
*/
|
|
void
|
|
exitshell(int status)
|
|
{
|
|
CTRACE(DBG_ERRS|DBG_PROCS|DBG_CMDS|DBG_TRAP,
|
|
("pid %d: exitshell(%d)\n", getpid(), status));
|
|
|
|
exiting = 1;
|
|
exiting_status = status;
|
|
exitshell_savedstatus();
|
|
}
|
|
|
|
void
|
|
exitshell_savedstatus(void)
|
|
{
|
|
struct jmploc loc;
|
|
char *p;
|
|
volatile int sig = 0;
|
|
int s;
|
|
sigset_t sigs;
|
|
|
|
CTRACE(DBG_ERRS|DBG_PROCS|DBG_CMDS|DBG_TRAP,
|
|
("pid %d: exitshell_savedstatus()%s $?=%d xs=%d dt=%d ts=%d\n",
|
|
getpid(), exiting ? " exiting" : "", exitstatus,
|
|
exiting_status, in_dotrap, last_trapsig));
|
|
|
|
if (!exiting) {
|
|
if (in_dotrap && last_trapsig) {
|
|
sig = last_trapsig;
|
|
exiting_status = sig + 128;
|
|
} else
|
|
exiting_status = exitstatus;
|
|
}
|
|
exitstatus = exiting_status;
|
|
|
|
if (!setjmp(loc.loc)) {
|
|
handler = &loc;
|
|
|
|
if (!traps_invalid && (p = trap[0]) != NULL && *p != '\0') {
|
|
reset_eval();
|
|
trap[0] = NULL;
|
|
VTRACE(DBG_TRAP, ("exit trap: \"%s\"\n", p));
|
|
evalstring(p, 0);
|
|
}
|
|
}
|
|
|
|
INTOFF; /* we're done, no more interrupts. */
|
|
|
|
if (!setjmp(loc.loc)) {
|
|
handler = &loc; /* probably unnecessary */
|
|
flushall();
|
|
#if JOBS
|
|
setjobctl(0);
|
|
#endif
|
|
}
|
|
|
|
if ((s = sig) != 0 && s != SIGSTOP && s != SIGTSTP && s != SIGTTIN &&
|
|
s != SIGTTOU) {
|
|
struct rlimit nocore;
|
|
|
|
/*
|
|
* if the signal is of the core dump variety, don't...
|
|
*/
|
|
nocore.rlim_cur = nocore.rlim_max = 0;
|
|
(void) setrlimit(RLIMIT_CORE, &nocore);
|
|
|
|
signal(s, SIG_DFL);
|
|
sigemptyset(&sigs);
|
|
sigaddset(&sigs, s);
|
|
sigprocmask(SIG_UNBLOCK, &sigs, NULL);
|
|
|
|
kill(getpid(), s);
|
|
}
|
|
_exit(exiting_status);
|
|
/* NOTREACHED */
|
|
}
|