我有一个程序叫做timeout
,可以实现这个功能 - 它是用C编写的,最初是在1989年编写的,但自那以后定期更新。
#define _POSIX_SOURCE
#define _XOPEN_SOURCE 500
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "stderr.h"
#define CHILD 0
#define FORKFAIL -1
static const char usestr[] = "[-vV] -t time [-s signal] cmd [arg ...]";
#ifndef lint
const char jlss_id_timeout_c[] = "@(#)$Id: timeout.c,v 4.6 2007/03/01 22:23:02 jleffler Exp $";
#endif
static void catcher(int signum)
{
return;
}
int main(int argc, char **argv)
{
pid_t pid;
int tm_out;
int kill_signal;
pid_t corpse;
int status;
int opt;
int vflag = 0;
err_setarg0(argv[0]);
opterr = 0;
tm_out = 0;
kill_signal = SIGTERM;
while ((opt = getopt(argc, argv, "vVt:s:")) != -1)
{
switch(opt)
{
case 'V':
err_version("TIMEOUT", &"@(#)$Revision: 4.6 $ ($Date: 2007/03/01 22:23:02 $)"[4]);
break;
case 's':
kill_signal = atoi(optarg);
if (kill_signal <= 0 || kill_signal >= SIGRTMIN)
err_error("signal number must be between 1 and %d\n", SIGRTMIN - 1);
break;
case 't':
tm_out = atoi(optarg);
if (tm_out <= 0)
err_error("time must be greater than zero (%s)\n", optarg);
break;
case 'v':
vflag = 1;
break;
default:
err_usage(usestr);
break;
}
}
if (optind >= argc || tm_out == 0)
err_usage(usestr);
if ((pid = fork()) == FORKFAIL)
err_syserr("failed to fork\n");
else if (pid == CHILD)
{
execvp(argv[optind], &argv[optind]);
err_syserr("failed to exec command %s\n", argv[optind]);
}
if (vflag)
err_remark("time %d, signal %d, child PID %u\n", tm_out, kill_signal, (unsigned)pid);
signal(SIGALRM, catcher);
alarm((unsigned int)tm_out);
while ((corpse = wait(&status)) != pid && errno != ECHILD)
{
if (errno == EINTR)
{
if (vflag)
err_remark("timed out - send signal %d to process %d\n", (int)kill_signal, (int)pid);
if (kill(pid, kill_signal) != 0)
err_syserr("sending signal %d to PID %d - ", kill_signal, pid);
corpse = wait(&status);
break;
}
}
alarm(0);
if (vflag)
{
if (corpse == (pid_t) -1)
err_syserr("no valid PID from waiting - ");
else
err_remark("child PID %u status 0x%04X\n", (unsigned)corpse, (unsigned)status);
}
if (corpse != pid)
status = 2;
else if (WIFEXITED(status))
status = WEXITSTATUS(status);
else if (WIFSIGNALED(status))
status = WTERMSIG(status);
else
status = 2;
return(status);
}
如果您需要“stderr.h”和“stderr.c”的“官方”代码,请联系我(请参阅我的个人资料)。