Close file descriptors

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@17514 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,3 +1,8 @@
+2003-08-22  Adam Fedor  <fedor@gnu.org>
+
+	* Tools/gsnd/gsnd.m (main): Close any open file descriptors so
+	we can be a proper daemon.
+
 2003-08-22  Gregory John Casamento <greg_casamento@yahoo.com>
 
 	* Source/GSNibTemplates.[hm]: Added new template classes to a new file

Tools/gsnd/gsnd.m

@@ -24,11 +24,16 @@
 #include "portaudio/pa_common/portaudio.h"
 #include <math.h>
 #include <unistd.h>
+#include <fcntl.h>
 
 #ifdef __MINGW__
 #include "process.h"
 #endif
 
+#ifdef	HAVE_SYSLOG_H
+#include <syslog.h>
+#endif
+
 #define	GSNDNAME @"GNUstepGSSoundServer"
 #define FRAME_SIZE 4
 #define BUFFER_SIZE_IN_FRAMES (1024 * FRAME_SIZE)  
@@ -60,6 +65,8 @@
 #define CLAMP(x, low, high) \
 (((x) > (high)) ? (high) : (((x) < (low)) ? (low) : (x)))
 
+static int	is_daemon = 0;		/* Currently running as daemon.	 */
+
 short **_X;
 short **_Y;
 unsigned int _Time;
@@ -77,6 +84,66 @@ int resamplerReadData(int inCount, short inArray[], short *outPtr[],
 															int dataArraySize, int Xoff, BOOL init_count);
 int resampleError(char *s);
 		
+static char	ebuf[2048];
+
+
+#ifdef HAVE_SYSLOG
+
+static int	log_priority;
+
+static void
+gsnd_log (int prio)
+{
+  if (is_daemon)
+    {
+      syslog (log_priority | prio, ebuf);
+    }
+  else if (prio == LOG_INFO)
+    {
+      write (1, ebuf, strlen (ebuf));
+      write (1, "\n", 1);
+    }
+  else
+    {
+      write (2, ebuf, strlen (ebuf));
+      write (2, "\n", 1);
+    }
+
+  if (prio == LOG_CRIT)
+    {
+      if (is_daemon)
+	{
+	  syslog (LOG_CRIT, "exiting.");
+	}
+      else
+     	{
+	  fprintf (stderr, "exiting.\n");
+	  fflush (stderr);
+	}
+      exit(EXIT_FAILURE);
+    }
+}
+#else
+
+#define	LOG_CRIT	2
+#define LOG_DEBUG	0
+#define LOG_ERR		1
+#define LOG_INFO	0
+#define LOG_WARNING	0
+void
+gsnd_log (int prio)
+{
+  write (2, ebuf, strlen (ebuf));
+  write (2, "\n", 1);
+  if (prio == LOG_CRIT)
+    {
+      fprintf (stderr, "exiting.\n");
+      fflush (stderr);
+      exit(EXIT_FAILURE);
+    }
+}
+#endif
+
 @protocol GSSndObj
 
 - (void)setIdentifier:(NSString *)identifier;
@@ -969,6 +1036,7 @@ static int paCallback(void *inputBuffer,
 
 int main(int argc, char** argv, char **env)
 {
+  int c;
   CREATE_AUTORELEASE_POOL(pool);
 
 #ifdef GS_PASS_ARGUMENTS
@@ -1007,6 +1075,34 @@ int main(int argc, char** argv, char **env)
 	}
 #endif 
 
+  /*
+   *	Ensure we don't have any open file descriptors which may refer
+   *	to sockets bound to ports we may try to use.
+   *
+   *	Use '/dev/null' for stdin and stdout.  Assume stderr is ok.
+   */
+  for (c = 0; c < FD_SETSIZE; c++)
+    {
+      if (is_daemon || (c != 2))
+	{
+	  (void)close(c);
+	}
+    }
+  if (open("/dev/null", O_RDONLY) != 0)
+    {
+      sprintf(ebuf, "failed to open stdin from /dev/null (%s)\n",
+	strerror(errno));
+      gsnd_log(LOG_CRIT);
+      exit(EXIT_FAILURE);
+    }
+  if (open("/dev/null", O_WRONLY) != 1)
+    {
+      sprintf(ebuf, "failed to open stdout from /dev/null (%s)\n",
+	strerror(errno));
+      gsnd_log(LOG_CRIT);
+      exit(EXIT_FAILURE);
+    }
+
   gsnd = [[SoundServer alloc] init];
 
   if (gsnd == nil) {