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/*
timelimit.c, part of
netpipes: network pipe utilities
Copyright (C) 1996-98 Robert Forsman
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
static char info[] = "timelimit: a utility for sockets\nWritten 1996 by Robert Forsman <thoth@purplefrog.com>\n";
#include <stdio.h>
#include <signal.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
extern int errno;
#include "common.h"
int verbose = 0;
int nokill = 0;
char *childprogname=0;
int deadchild = 0;
void notice_child()
{
deadchild = 1;
}
void usage()
{
fprintf(stderr,"Usage : %s [ -v ] [ -nokill ] <time limit> <command> <args>\n",
progname);
}
void kill_child(childpid)
int childpid;
{
if (verbose)
fprintf(stderr, "%s: child time limit exceeded; killing %s.\n",
progname, childprogname);
kill (childpid, SIGTERM);
if (!deadchild)
sleep(2);
kill (childpid, SIGHUP);
if (!deadchild)
sleep(2);
kill (childpid, SIGKILL);
{
int i=0;
while (!deadchild) {
int rval;
sleep(1);
rval = kill(childpid, SIGKILL);
if (rval != 0 && errno == ESRCH)
break;
if (i==5 && verbose) {
fprintf(stderr, "%s: child %s refuses to die [%d]. "
"I refuse to stop killing it.\n",
progname, childprogname, rval);
}
i++;
}
}
/* it better be dead now */
}
int main (argc,argv)
int argc;
char ** argv;
{
int childpid, timelimit;
time_t start_time;
set_progname(argv[0]);
while (argc>1) {
if (0==strcmp(argv[1], "-v")) {
verbose = 1;
argv++;
argc--;
} else if (0==strcmp(argv[1], "-nokill")) {
nokill = 1;
argv++;
argc--;
} else {
break;
}
}
if (argc<3) {
usage();
exit(1);
}
{
int factor=1;
char *ch = argv[1];
ch = ch + strlen(ch)-1;
switch (*ch) {
case 'Y': factor = 365*24*60*60; break;
case 'w': factor = 7*24*60*60; break;
case 'M': factor *= 30; /* fall through */
case 'd': factor *= 24;
case 'h': factor *= 60;
case 'm': factor *= 60; break;
default:
ch = 0;
}
if (ch)
*ch = 0;
timelimit = strtol(argv[1], &ch, 0);
if (*ch != 0) {
fprintf(stderr, "%s: time spec must be mostly numeric. %s is bogus.\n",
progname, argv[1]);
exit(1);
}
timelimit *= factor;
}
if (verbose)
emit_version("timelimit", 1996);
start_time = time((time_t*)0);
childprogname = argv[2];
childpid = fork();
if (childpid<0) {
fprintf(stderr, "%s: unable to fork (%s).\n", progname, strerror(errno));
exit (1);
}
if (childpid==0) {
/* child */
execvp(argv[2], argv+2);
fprintf(stderr, "%s: Unable to exec %s (%s).\n",
progname, argv[2], strerror(errno));
exit (1);
}
signal(SIGCHLD, notice_child);
while (!deadchild) {
time_t now = time((time_t*)0);
if (now >= start_time + timelimit) {
if (nokill) {
if (verbose) {
fprintf(stderr, "%s: I've waited more than %s for %s. "
"It must finish in the background.\n",
progname, argv[1], argv[2]);
}
exit(127);
} else {
kill_child(childpid);
}
break;
}
sleep (start_time + timelimit - now);
}
{
int status;
if (0>waitpid(childpid, &status, 0)) {
/* the child should already be dead. What's the deal? */
fprintf(stderr, "%s: very strange. Error while waiting for child process\n", progname);
exit (1);
} else {
if (verbose)
fprintf(stderr, "%s: child `%s' exit status 0x%x\n",
progname, childprogname, status);
if (WIFEXITED(status))
exit(WEXITSTATUS(status));
else
exit(1); /* what, am I going to signal myself?! */
}
}
}
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