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Diffstat (limited to 'release/picobsd/tinyware/ash/trap.c')
-rw-r--r-- | release/picobsd/tinyware/ash/trap.c | 383 |
1 files changed, 0 insertions, 383 deletions
diff --git a/release/picobsd/tinyware/ash/trap.c b/release/picobsd/tinyware/ash/trap.c deleted file mode 100644 index dc5e1c8..0000000 --- a/release/picobsd/tinyware/ash/trap.c +++ /dev/null @@ -1,383 +0,0 @@ -/* $NetBSD: trap.c,v 1.17 1997/07/04 21:02:24 christos 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. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. 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 1.17 1997/07/04 21:02:24 christos Exp $"); -#endif -#endif /* not lint */ - -#include <signal.h> -#include <unistd.h> -#include <stdlib.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 "syntax.h" -#include "output.h" -#include "memalloc.h" -#include "error.h" -#include "trap.h" -#include "mystring.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 */ - - -extern char nullstr[1]; /* null string */ - -char *trap[NSIG+1]; /* trap handler commands */ -MKINIT char sigmode[NSIG]; /* current value of signal */ -char gotsig[NSIG]; /* indicates specified signal received */ -int pendingsigs; /* indicates some signal received */ - -static int getsigaction __P((int, sig_t *)); - -/* - * The trap builtin. - */ - -int -trapcmd(argc, argv) - int argc; - char **argv; -{ - char *action; - char **ap; - int signo; - - if (argc <= 1) { - for (signo = 0 ; signo <= NSIG ; signo++) { - if (trap[signo] != NULL) - out1fmt("%d: %s\n", signo, trap[signo]); - } - return 0; - } - ap = argv + 1; - if (is_number(*ap)) - action = NULL; - else - action = *ap++; - while (*ap) { - if ((signo = number(*ap)) < 0 || signo > NSIG) - error("%s: bad trap", *ap); - INTOFF; - if (action) - action = savestr(action); - if (trap[signo]) - ckfree(trap[signo]); - trap[signo] = action; - if (signo != 0) - setsignal(signo); - INTON; - ap++; - } - return 0; -} - - - -/* - * Clear traps on a fork. - */ - -void -clear_traps() { - char **tp; - - for (tp = trap ; tp <= &trap[NSIG] ; tp++) { - if (*tp && **tp) { /* trap not NULL or SIG_IGN */ - INTOFF; - ckfree(*tp); - *tp = NULL; - if (tp != &trap[0]) - setsignal(tp - trap); - INTON; - } - } -} - - - -/* - * Set the signal handler for the specified signal. The routine figures - * out what it should be set to. - */ - -long -setsignal(signo) - int signo; -{ - int action; - sig_t sigact = SIG_DFL; - char *t; - - if ((t = trap[signo]) == NULL) - action = S_DFL; - else if (*t != '\0') - action = S_CATCH; - else - action = S_IGN; - if (rootshell && action == S_DFL) { - switch (signo) { - case SIGINT: - if (iflag) - action = S_CATCH; - break; - case SIGQUIT: -#ifdef DEBUG - { - extern int debug; - - if (debug) - break; - } -#endif - /* FALLTHROUGH */ - case SIGTERM: - if (iflag) - action = S_IGN; - break; -#if JOBS - case SIGTSTP: - case SIGTTOU: - if (mflag) - action = S_IGN; - break; -#endif - } - } - - t = &sigmode[signo - 1]; - if (*t == 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. - */ - return 0; - } - if (sigact == SIG_IGN) { - if (mflag && (signo == SIGTSTP || - signo == SIGTTIN || signo == SIGTTOU)) { - *t = S_IGN; /* don't hard ignore these */ - } else - *t = S_HARD_IGN; - } else { - *t = S_RESET; /* force to be set */ - } - } - if (*t == S_HARD_IGN || *t == action) - return 0; - switch (action) { - case S_DFL: sigact = SIG_DFL; break; - case S_CATCH: sigact = onsig; break; - case S_IGN: sigact = SIG_IGN; break; - } - *t = action; - return (long)signal(signo, sigact); -} - -/* - * Return the current setting for sig w/o changing it. - */ -static int -getsigaction(signo, sigact) - 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(signo) - int signo; -{ - if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) { - signal(signo, SIG_IGN); - } - sigmode[signo - 1] = S_HARD_IGN; -} - - -#ifdef mkinit -INCLUDE <signal.h> -INCLUDE "trap.h" - -SHELLPROC { - char *sm; - - clear_traps(); - for (sm = sigmode ; sm < sigmode + NSIG ; sm++) { - if (*sm == S_IGN) - *sm = S_HARD_IGN; - } -} -#endif - - - -/* - * Signal handler. - */ - -void -onsig(signo) - int signo; -{ - signal(signo, onsig); - if (signo == SIGINT && trap[SIGINT] == NULL) { - onint(); - return; - } - gotsig[signo - 1] = 1; - pendingsigs++; -} - - - -/* - * Called to execute a trap. Perhaps we should avoid entering new trap - * handlers while we are executing a trap handler. - */ - -void -dotrap() { - int i; - int savestatus; - - for (;;) { - for (i = 1 ; ; i++) { - if (gotsig[i - 1]) - break; - if (i >= NSIG) - goto done; - } - gotsig[i - 1] = 0; - savestatus=exitstatus; - evalstring(trap[i]); - exitstatus=savestatus; - } -done: - pendingsigs = 0; -} - - - -/* - * Controls whether the shell is interactive or not. - */ - - -void -setinteractive(on) - int on; -{ - static int is_interactive; - - if (on == is_interactive) - return; - setsignal(SIGINT); - setsignal(SIGQUIT); - setsignal(SIGTERM); - is_interactive = on; -} - - - -/* - * Called to exit the shell. - */ - -void -exitshell(status) - int status; -{ - struct jmploc loc1, loc2; - char *p; - - TRACE(("exitshell(%d) pid=%d\n", status, getpid())); - if (setjmp(loc1.loc)) { - goto l1; - } - if (setjmp(loc2.loc)) { - goto l2; - } - handler = &loc1; - if ((p = trap[0]) != NULL && *p != '\0') { - trap[0] = NULL; - evalstring(p); - } -l1: handler = &loc2; /* probably unnecessary */ - flushall(); -#if JOBS - setjobctl(0); -#endif -l2: _exit(status); -} |