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Added daemon() function to libbsd.so.

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git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22164 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2007-09-04 12:32:20 +00:00
parent f303cd6cc2
commit 079c69cbfd
3 changed files with 71 additions and 1 deletions
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3
headers/compatibility/bsd/stdlib.h
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@ -1,5 +1,5 @@
/*
* Copyright 2006, Haiku, Inc. All Rights Reserved.
* Copyright 2006-2007, Haiku, Inc. All Rights Reserved.
* Distributed under the terms of the MIT License.
*/
#ifndef _BSD_STDLIB_H_
@ -13,6 +13,7 @@
extern "C" {
#endif
int daemon(int noChangeDir, int noClose);
const char *getprogname(void);
void setprogname(const char *programName);

1
src/libs/bsd/Jamfile
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@ -5,6 +5,7 @@ SetSubDirSupportedPlatforms $(HAIKU_BONE_COMPATIBLE_PLATFORMS) ;
UseHeaders [ FDirName $(HAIKU_TOP) headers compatibility bsd ] : true ;
SharedLibrary libbsd.so :
daemon.c
err.c
fgetln.c
getpass.c

68
src/libs/bsd/daemon.c Normal file
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@ -0,0 +1,68 @@
/*
* Copyright 2007, Haiku, Inc. All Rights Reserved.
* Distributed under the terms of the MIT License.
*
* Authors:
* Axel Dörfler, axeld@pinc-software.de
*/
#include <fcntl.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
static void
restore_old_sighup(int result, struct sigaction *action)
{
if (result != -1)
sigaction(SIGHUP, action, NULL);
}
int
daemon(int noChangeDir, int noClose)
{
struct sigaction oldAction, action;
int oldActionResult;
pid_t newGroup;
pid_t pid;
/* Ignore eventually send SIGHUPS on parent exit */
sigemptyset(&action.sa_mask);
action.sa_handler = SIG_IGN;
action.sa_flags = 0;
oldActionResult = sigaction(SIGHUP, &action, &oldAction);
pid = fork();
if (pid == -1) {
restore_old_sighup(oldActionResult, &oldAction);
return -1;
}
if (pid > 0) {
// we're the parent - let's exit
exit(0);
}
newGroup = setsid();
restore_old_sighup(oldActionResult, &oldAction);
if (newGroup == -1)
return -1;
if (!noChangeDir)
chdir("/");
if (!noClose) {
int fd = open("/dev/null", O_RDWR);
if (fd != -1) {
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > STDERR_FILENO)
close(fd);
}
}
return 0;
}