support for creating pid files when going daemon mode.

Someone should really review it as it is my first experience in C.

include/main.h

@@ -92,6 +92,7 @@ struct vlc_t
     char *                 psz_homedir;           /* configuration directory */
     char *                 psz_userdir;             /* user's home directory */
     char *                 psz_configfile;        /* location of config file */
+    char *                 psz_pidfile;
 
     /* Fast memcpy plugin used */
     module_t *             p_memcpy_module;

src/libvlc.c

@@ -419,6 +419,32 @@ int VLC_Init( int i_object, int i_argc, char *ppsz_argv[] )
 
         p_vlc->p_libvlc->b_daemon = VLC_TRUE;
 
+		/* lets check if we need to write the pidfile */
+		p_vlc->psz_pidfile = config_GetPsz( p_vlc, "pidfile" );
+
+		msg_Dbg( p_vlc, "p_vlc->psz_pidfile is %s", p_vlc->psz_pidfile );
+
+		if( p_vlc->psz_pidfile != NULL )
+		{
+			pid_t i_pid;
+			FILE *pidfile;
+			
+			i_pid = getpid();
+
+			msg_Dbg( p_vlc, "our PID is %d, writing it to %s", i_pid, p_vlc->psz_pidfile );
+			
+			pidfile = utf8_fopen( p_vlc->psz_pidfile,"w" );
+			if( pidfile != NULL )
+			{
+				utf8_fprintf( pidfile, "%d", (int)i_pid );
+				fclose( pidfile );
+			}
+			else
+			{
+				msg_Err( p_vlc, "Cannot open pid file for writing: %s, error: %s", p_vlc->psz_pidfile, strerror(errno) );
+			}
+        }
+
 #else
         pid_t i_pid;
 

src/libvlc.h

@@ -835,6 +835,10 @@ static char *ppsz_clock_descriptions[] =
 #define DAEMON_LONGTEXT N_( \
      "Runs VLC as a background daemon process.")
 
+#define PIDFILE_TEXT N_("Write process id to file")
+#define PIDFILE_LONGTEXT N_( \
+       "Writes proccess id into specified file.")
+
 #define FILE_LOG_TEXT N_( "Log to file" )
 #define FILE_LOG_LONGTEXT N_( \
     "Log all VLC messages to a text file." )
@@ -1591,6 +1595,9 @@ vlc_module_begin();
 #if !defined(WIN32)
     add_bool( "daemon", 0, NULL, DAEMON_TEXT, DAEMON_LONGTEXT, VLC_TRUE );
         change_short('d');
+
+    add_string( "pidfile", NULL, NULL, PIDFILE_TEXT, PIDFILE_LONGTEXT,
+                                       VLC_FALSE );
 #endif
 
     add_bool( "file-logging", VLC_FALSE, NULL, FILE_LOG_TEXT, FILE_LOG_LONGTEXT,