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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <unistd.h>
ngx_int_t
ngx_daemon(ngx_log_t *log)
{
int fd;
/* retain the return value for passing back to caller */
pid_t pid_child = fork();
switch (pid_child) {
case -1:
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "fork() failed");
return NGX_ERROR;
case 0:
break;
default:
/* let caller do the exit() */
return pid_child;
}
ngx_parent = ngx_pid;
ngx_pid = ngx_getpid();
if (setsid() == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "setsid() failed");
return NGX_ERROR;
}
umask(0);
fd = open("/dev/null", O_RDWR);
if (fd == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
"open(\"/dev/null\") failed");
return NGX_ERROR;
}
if (dup2(fd, STDIN_FILENO) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDIN) failed");
return NGX_ERROR;
}
if (dup2(fd, STDOUT_FILENO) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDOUT) failed");
return NGX_ERROR;
}
#if 0
if (dup2(fd, STDERR_FILENO) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "dup2(STDERR) failed");
return NGX_ERROR;
}
#endif
if (fd > STDERR_FILENO) {
if (close(fd) == -1) {
ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "close() failed");
return NGX_ERROR;
}
}
return NGX_OK;
}
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