From 77200d57795309e5a836f65f0e81352fb09285d5 Mon Sep 17 00:00:00 2001
From: Nick Bolton <nick@synergy-project.org>
Date: Thu, 13 Jan 2011 01:34:31 +0000
Subject: [PATCH] Merge 1.4 r826:827 intro trunk

---
 lib/arch/CArchDaemonUnix.cpp | 53 ++++++++++++++++++++++++++++++++----
 1 file changed, 48 insertions(+), 5 deletions(-)

diff --git a/lib/arch/CArchDaemonUnix.cpp b/lib/arch/CArchDaemonUnix.cpp
index ad323d39..d86803ad 100644
--- a/lib/arch/CArchDaemonUnix.cpp
+++ b/lib/arch/CArchDaemonUnix.cpp
@@ -24,6 +24,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <cstdlib>
+#include "CLog.h"
 
 //
 // CArchDaemonUnix
@@ -39,10 +40,37 @@ CArchDaemonUnix::~CArchDaemonUnix()
 	// do nothing
 }
 
+
+#ifdef __APPLE__
+
+// In Mac OS X, fork()'d child processes can't use most APIs (the frameworks
+// that Synergy uses in fact prevent it and make the process just up and die),
+// so need to exec a copy of the program that doesn't fork so isn't limited.
+int
+execSelfNonDaemonized()
+{
+	extern char** NXArgv;
+	char** selfArgv = NXArgv;
+	
+	setenv("_SYNERGY_DAEMONIZED", "", 1);
+	
+	execvp(selfArgv[0], selfArgv);
+	return 0;
+}
+
+bool alreadyDaemonized() {
+	return getenv("_SYNERGY_DAEMONIZED") != NULL;
+}
+
+#endif
+
 int
 CArchDaemonUnix::daemonize(const char* name, DaemonFunc func)
 {
-	int dummy;
+#ifdef __APPLE__
+	if (alreadyDaemonized())
+		return func(1, &name);
+#endif
 	
 	// fork so shell thinks we're done and so we're not a process
 	// group leader
@@ -62,9 +90,16 @@ CArchDaemonUnix::daemonize(const char* name, DaemonFunc func)
 
 	// become leader of a new session
 	setsid();
-
+	
+#ifndef __APPLE__
+	// NB: don't run chdir on apple; causes strange behaviour.
 	// chdir to root so we don't keep mounted filesystems points busy
-	dummy = chdir("/");
+	// TODO: this is a bit of a hack - can we find a better solution?
+	int chdirErr = chdir("/");
+	if (chdirErr)
+		// NB: file logging actually isn't working at this point!
+		LOG((CLOG_ERR "chdir error: %i", chdirErr));
+#endif
 
 	// mask off permissions for any but owner
 	umask(077);
@@ -78,8 +113,16 @@ CArchDaemonUnix::daemonize(const char* name, DaemonFunc func)
 	// of standard I/O safely goes in the bit bucket.
 	open("/dev/null", O_RDONLY);
 	open("/dev/null", O_RDWR);
-	dummy = dup(1);
-
+	
+	int dupErr = dup(1);
+	if (dupErr)
+		// NB: file logging actually isn't working at this point!
+		LOG((CLOG_ERR "dup error: %i", dupErr));
+	
+#ifdef __APPLE__
+	return execSelfNonDaemonized();
+#endif
+	
 	// invoke function
 	return func(1, &name);
 }