From 079c69cbfd7cd3c97baae91332251c8388a8bb02 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Axel=20D=C3=B6rfler?= <axeld@pinc-software.de>
Date: Tue, 4 Sep 2007 12:32:20 +0000
Subject: [PATCH] Added daemon() function to libbsd.so.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22164 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 headers/compatibility/bsd/stdlib.h |  3 +-
 src/libs/bsd/Jamfile               |  1 +
 src/libs/bsd/daemon.c              | 68 ++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+), 1 deletion(-)
 create mode 100644 src/libs/bsd/daemon.c

diff --git a/headers/compatibility/bsd/stdlib.h b/headers/compatibility/bsd/stdlib.h
index 1e6e888e13..4d2410ba63 100644
--- a/headers/compatibility/bsd/stdlib.h
+++ b/headers/compatibility/bsd/stdlib.h
@@ -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);
 
diff --git a/src/libs/bsd/Jamfile b/src/libs/bsd/Jamfile
index 65f9e2c032..b9e3fa1551 100644
--- a/src/libs/bsd/Jamfile
+++ b/src/libs/bsd/Jamfile
@@ -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
diff --git a/src/libs/bsd/daemon.c b/src/libs/bsd/daemon.c
new file mode 100644
index 0000000000..a34825dd3c
--- /dev/null
+++ b/src/libs/bsd/daemon.c
@@ -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;
+}