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/* See LICENSE file for copyright and license details. */
#include <sys/prctl.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
struct sig {
int signo;
const char *name;
} sigs[] = {
{SIGHUP, "HUP"},
{SIGINT, "INT"},
{SIGQUIT, "QUIT"},
{SIGILL, "ILL"},
{SIGTRAP, "TRAP"},
{SIGABRT, "ABRT"},
{SIGIOT, "IOT"},
{SIGBUS, "BUS"},
{SIGFPE, "FPE"},
{SIGKILL, "KILL"},
{SIGUSR1, "USR1"},
{SIGSEGV, "SEGV"},
{SIGUSR2, "USR2"},
{SIGPIPE, "PIPE"},
{SIGALRM, "ALRM"},
{SIGTERM, "TERM"},
{SIGSTKFLT, "TKFLT"},
{SIGCLD, "CLD"},
{SIGCHLD, "CHLD"},
{SIGCONT, "CONT"},
{SIGSTOP, "STOP"},
{SIGTSTP, "TSTP"},
{SIGTTIN, "TTIN"},
{SIGTTOU, "TTOU"},
{SIGURG, "URG"},
{SIGXCPU, "XCPU"},
{SIGXFSZ, "XFSZ"},
{SIGVTALRM, "VTALRM"},
{SIGPROF, "PROF"},
{SIGWINCH, "WINCH"},
{SIGPOLL, "POLL"},
{SIGIO, "IO"},
{SIGPWR, "PWR"},
{SIGSYS, "SYS"},
{0, NULL}
};
const char *argv0;
static void
usage(void)
{
fprintf(stderr, "usage: %s (-L | (signal)[(+|-)off] command [argument] ...)\n", argv0);
exit(127);
}
static void
invalid_signal(void)
{
fprintf(stderr, "%s: invalid signal\n", argv0);
exit(127);
}
static void
print_signals(void)
{
struct sig *sig = sigs;
for (; sig->name; sig++)
printf("%s\n", sig->name);
printf("RTMIN\nRTMAX\n");
}
static int
strict_strtoi(const char *str, int min, int max)
{
char *end;
long int ret;
errno = 0;
ret = strtol(str, &end, 10);
if (errno || *end)
usage();
if (ret < min || ret > max)
invalid_signal();
return (int)ret;
}
static int
get_signal(const char *str)
{
struct sig *sig = sigs;
int have_prefix = 0;
char *end;
long int ret;
if (!strncasecmp(str, "SIG", 3)) {
str += 3;
have_prefix = 1;
}
if (!strcasecmp(str, "RTMIN"))
return SIGRTMIN;
if (!strcasecmp(str, "RTMAX"))
return SIGRTMAX;
for (; sig->name; sig++) {
if (!strcasecmp(str, sig->name))
return sig->signo;
}
if (!have_prefix) {
errno = 0;
ret = strtol(str, &end, 10);
if (!errno && !*end && 0 <= ret && ret < _NSIG)
return (int)ret;
}
invalid_signal();
return -1;
}
int
main(int argc, char *argv[])
{
char *off;
char sign = '\0';
int signo;
argv0 = *argv ? (argc--, *argv++) : "pdeath";
if (*argv && **argv == '-') {
if (argc == 1 && !strcmp(*argv, "-L")) {
print_signals();
if (fflush(stdout) || fclose(stdout)) {
perror(argv0);
return 127;
}
return 0;
}
usage();
}
if (argc < 2)
usage();
if ((off = strpbrk(*argv, "+-"))) {
sign = *off;
*off++ = '\0';
}
signo = get_signal(*argv);
if (sign == '-')
signo -= strict_strtoi(off, 0, signo);
else if (sign == '+')
signo += strict_strtoi(off, 0, _NSIG - 1 - signo);
argv++, argc--;
if (prctl(PR_SET_PDEATHSIG, signo) == -1) {
perror(argv0);
return 127;
}
execvp(*argv, argv);
fprintf(stderr, "%s: %s: %s\n", argv0, strerror(errno), *argv);
return 127;
}
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