发信人: jalinsoo()
整理人: wenbobo(2002-12-27 15:55:46), 站内信件
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【 在 tjam (江南才子) 的大作中提到: 】
: 【 在 girlrong (阿蓉) 的大作中提到: 】
: : 因我对unix下的c编程一窍不通，板斧ken_qian极少来c版。又有网友反应c版
: : 讨论unix下的c编程的文章太少，故征求板斧若干。要求熟悉unix下的c编程，且
: : 愿意解答网友的相关问题，有空撰写有关unix下的c编程的文章。欢迎各位高手踊
: .......
可惜我的时间不是很多,不然倒可以略尽绵力
下面送给大家一段将一个进程推入后台的代码吧
#include <signal.h>
#include <errno.h>
#include <sys/resource.h>
/*--------------------------------------------------------------------
----------
* Detach a daemon process from login session controlling terminal
*--------------------------------------------------------------------
----------
*/
int daemon_start()
{
register int childpid, fd;
struct rlimit rl;
/*
* If we were not started in the background, fork and
* let the parent exit. This also guarantees the first child
* is not a process group header.
*/
if ((childpid = fork()) < 0)
return(-1);
else if (childpid > 0)
exit(0); /* parent */
/*
* First child process.
* Disassociate from controlling terminal and process group.
* Ensure the process can't reacquire a new controlling terminal.
*/
if (setpgrp() < 0) return(-1);
signal(SIGHUP,SIG_IGN); /* immune from pgrp leader death */
if ((childpid = fork()) < 0)
return(-1);
else if (childpid > 0)
exit(0); /* first child */
/*
* Second child
* Close any open file descriptors.
*/
getrlimit(RLIMIT_NOFILE, &rl);
for (fd=rl.rlim_cur; fd>=0 ; --fd)
close(fd);
errno = 0; /* probably got set to EBADF from a close */
/*
* Move the current directory to root, to make sure we
* aren't on a mounted filesystem.
*/
chdir("/");
/*
* Clear any inherited file mode creation mask.
*/
umask(0);
signal(SIGCLD,SIG_IGN);
#ifdef SIGTTOU
signal(SIGTTOU,SIG_IGN);
signal(SIGTTIN,SIG_IGN);
signal(SIGTSTP,SIG_IGN);
#endif
signal(SIGINT,SIG_IGN);
signal(SIGTERM,SIG_IGN);
return(0);
}
--
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