代码如下所示：

复制代码 代码如下:

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <signal.h>

#include <unistd.h>

#include <errno.h>

#include <syslog.h>

#include <stdarg.h>

char **bak_argv;

int flag = 0;

void restart(void);

void sighup_handler(int sig);

// argv[0] 尽量使用绝对路径, 因为程序执行过程中可能会使用 chdir() .

int main(int argc, char *argv[])

{

openlog("sig_hup", LOG_PID, 0);

syslog(LOG_ERR, "%s", argv[0]);

closelog();

bak_argv = argv;

signal(SIGHUP, sighup_handler);

while(1)

{

if(flag)

restart();

sleep(10);

}

return 0;

}

void sighup_handler(int sig)

{

flag = 1;

}

void restart(void)

{

switch(fork())

{

case -1:

openlog("sig_hup", LOG_PID, 0);

syslog(LOG_ERR, "fork failed: %s", strerror(errno));

closelog();

exit(EXIT_FAILURE);

break;

case 0:

break;

default:

exit(EXIT_SUCCESS);

}

execv(bak_argv[0], bak_argv);

openlog("sig_hup", LOG_PID, 0);

syslog(LOG_ERR, "execv(%s, ...) failed: %sn", bak_argv[0], strerror(errno));

closelog();

exit(EXIT_FAILURE);

}