shell运行程序，后台运行linux程序,后台运行Linux程序的方法

后台运行Linux程序，可以通过crontab设置，这种方法一般用来让一个程序定时运行，也可以通过./test &这样在程序末尾加上一个&使程序在后台运行。

编写代码，下面我将参考httpd写一个程序使其运行不占控制台

shell运行程序、#include "detach.h"

void detach(void)

{

docker进程？int x;

int pgrp;

chdir("/");

docker里面运行docker、if ((x = fork()) > 0)

exit(0); //exit parent, so we have the child

else if (x == -1) {

nodejs 多进程、perror("fork");

fprintf(stderr, "unable to fork new process\n");

exit(1);

LINUX教程。}

raise(SIGSTOP);

/* setsid - run a program in a new session*/

if ((pgrp = setsid()) == -1) {

perror("setsid");

fprintf(stderr, "setsid failed\n");

exit(1);

}

/* close out the standard file descriptors */

if (freopen("/dev/null", "r", stdin) == NULL) {

fprintf(stderr, "unable to replace stdin with /dev/null:\n");

/* continue anyhow -- note we can't close out descriptor 0 because we

* have nothing to replace it with, and if we didn't have a descriptor

* 0 the next file would be created with that value ... leading to

* havoc.

*/

}

if (freopen("/dev/null", "w", stdout) == NULL) {

fprintf(stderr, "unable to replace stdout with /dev/null: \n");

}

/* stderr is a tricky one, we really want it to be the error_log,

* but we haven't opened that yet.  So leave it alone for now and it'll

* be reopened moments later.

*/

}