Linux / Unix Command: daemon

最新推荐文章于 2025-08-16 11:44:53 发布

godspirits

最新推荐文章于 2025-08-16 11:44:53 发布

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文章标签： command unix linux library redirect function

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Command Library

NAME

daemon - run in the background

SYNOPSIS

#include <unistd.h>

int daemon(int nochdir, int noclose);

DESCRIPTION

The daemon() function is for programs wishing to detach themselves from the controlling terminal and run in the background as system daemons.

Unless the argument nochdir is non-zero, daemon() changes the current working directory to the root ("/").

Unless the argument noclose is non-zero, daemon() will redirect standard input, standard output and standard error to /dev/null.

RETURN VALUE

(This function forks, and if the fork() succeeds, the father does _exit(0), so that further errors are seen by the child only.) On success zero will be returned. If an error occurs, daemon() returns -1 and sets the global variable errno to any of the errors specified for the library functions fork(2) and setsid(2).