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/* $OpenBSD: signal.c,v 1.5 2008/06/01 18:38:29 sobrado Exp $ */
/*
* Copyright (c) 2002 Artur Grabowski <art@openbsd.org>
* All rights reserved.
*
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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 <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <sys/wait.h>
#include "pmdb.h"
void
init_sigstate(struct pstate *ps)
{
int i;
for (i = 1; i < NSIG; i++)
ps->ps_sigstate[i] = SS_STOP;
/* XXX - add more default ignored signals. */
ps->ps_sigstate[SIGALRM] = SS_IGNORE;
ps->ps_sigstate[SIGCHLD] = SS_IGNORE;
}
void
process_signal(struct pstate *ps, int signum, int stopped, int force_ignore)
{
int ignore, status;
if (stopped && (ps->ps_sigstate[signum] == SS_IGNORE || force_ignore))
ignore = 1;
else
ignore = 0;
if (force_ignore && ignore)
signum = 0;
ps->ps_signum = signum;
if (!stopped) {
/*
* Process terminated.
*/
/* Let it be restarted if it wasn't a forced termination. */
if ((ps->ps_flags & PSF_KILL) == 0)
ps->ps_state = NONE;
else
ps->ps_state = TERMINATED;
/*
* Wait for it as a parent.
* XXX - only if we're the real parent.
*/
wait(&status);
} else {
ps->ps_state = STOPPED;
}
if (!ignore) {
fprintf(stderr, "PMDB %s child. signal: %s\n",
stopped ? "stopping" : "terminating",
sys_signame[signum]);
} else {
cmd_process_cont(0, NULL, ps);
}
}
int
cmd_signal_ignore(int argc, char **argv, void *arg)
{
struct pstate *ps = arg;
int signum;
long l;
char *ep;
char *signame = argv[2];
int newstate;
if (!strcmp(argv[1], "ignore")) {
newstate = SS_IGNORE;
} else if (!strcmp(argv[1], "stop")) {
newstate = SS_STOP;
} else {
goto usage;
}
l = strtol(signame, &ep, 0);
if (signame[0] == '\0' || *ep != '\0' || l < 1 || l >= NSIG) {
if (!strncmp("SIG", signame, 3))
signame += 3;
for (signum = 1; signum < NSIG; signum++) {
if (!strcmp(sys_signame[signum], signame))
break;
}
} else {
signum = l;
}
switch (signum) {
case SIGINT:
case SIGSTOP:
case SIGKILL:
fprintf(stderr, "%s can't be ignored\n", signame);
goto usage;
case NSIG:
fprintf(stderr, "%s is not a valid signal\n", signame);
goto usage;
default:
break;
}
ps->ps_sigstate[signum] = newstate;
return 0;
usage:
fprintf(stderr, "usage: signal ignore|stop signum|signame\n");
return 0;
}
int
cmd_signal_show(int argc, char **argv, void *arg)
{
struct pstate *ps = arg;
int i;
for (i = 1; i < NSIG; i++) {
char *state;
switch (ps->ps_sigstate[i]) {
case SS_STOP:
state = "stop";
break;
case SS_IGNORE:
state = "ignore";
break;
default:
state = "error";
break;
}
printf("%2d %-6s\t%s\n", i, sys_signame[i], state);
}
return 0;
}
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