[lcd4linux @ 2003-08-08 06:58:06 by reinelt]

improved forking

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@207 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

1 files changed, 37 insertions, 25 deletions

diff --git a/lcd4linux.c b/lcd4linux.c
index dee44fd..9a1e64b 100644
--- a/lcd4linux.c
+++ b/lcd4linux.c
@@ -1,4 +1,4 @@
-/* $Id: lcd4linux.c,v 1.39 2003/07/24 04:48:09 reinelt Exp $
+/* $Id: lcd4linux.c,v 1.40 2003/08/08 06:58:06 reinelt Exp $
  *
  * LCD4Linux
  *
@@ -20,6 +20,9 @@
  *
  *
  * $Log: lcd4linux.c,v $
+ * Revision 1.40  2003/08/08 06:58:06  reinelt
+ * improved forking
+ *
  * Revision 1.39  2003/07/24 04:48:09  reinelt
  * 'soft clear' needed for virtual rows
  *
@@ -224,6 +227,7 @@ char *output=NULL;
 int got_signal=0;
 int debugging=0;
 int foreground=0;
+int background=0;
 int tick, tack;
 
 static void usage(void)
@@ -363,6 +367,26 @@ int main (int argc, char *argv[])
     exit(2);
   }
 
+  info ("Version " VERSION " starting");
+  if (!foreground && (my_argv[0]==NULL || my_argv[0][0]!='/')) {
+    info ("invoked without full path; restart may not work!");
+  }
+  
+  // set default values
+  cfg_set ("row1", "*** %o %v ***");
+  cfg_set ("row2", "%p CPU  %r MB RAM");
+  cfg_set ("row3", "Busy %cu%% $r10cu");
+  cfg_set ("row4", "Load %l1%L$r10l1");
+
+  if (cfg_read (cfg)==-1)
+    exit (1);
+  
+  driver=cfg_get("display",NULL);
+  if (driver==NULL || *driver=='\0') {
+    error ("missing 'display' entry in %s!", cfg_file());
+    exit (1);
+  }
+  
   if (!foreground) {
     pid_t i;
     int fd;
@@ -377,11 +401,22 @@ int main (int argc, char *argv[])
     // ignore nasty signals
     signal(SIGINT,  SIG_IGN);
     signal(SIGQUIT, SIG_IGN);
+
+    // chdir("/")
+    if (chdir("/")!=0) {
+      error ("chdir(\"/\") failed: %s", strerror(errno));
+      exit (1);
+    }
+    
+    // we want full control over permissions
+    umask (0);
+    
     // detach stdin
     if (freopen("/dev/null", "r", stdin)==NULL) {
       error ("freopen (/dev/null) failed: %s", strerror(errno));
       exit (1);
     }
+
     // detach stdout and stderr
     fd=open("/dev/null", O_WRONLY, 0666);
     if (fd==-1) {
@@ -393,30 +428,7 @@ int main (int argc, char *argv[])
     dup2(fd, STDOUT_FILENO);
     dup2(fd, STDERR_FILENO);
     close(fd);
-  }
-  
-  if (foreground) {
-    info ("Version " VERSION " starting");
-  } else {
-    info ("Version " VERSION " starting");
-    if (my_argv[0]==NULL || my_argv[0][0]!='/') {
-      info ("invoked without full path; restart may not work!");
-    }
-  }
-  
-  // set default values
-  cfg_set ("row1", "*** %o %v ***");
-  cfg_set ("row2", "%p CPU  %r MB RAM");
-  cfg_set ("row3", "Busy %cu%% $r10cu");
-  cfg_set ("row4", "Load %l1%L$r10l1");
-
-  if (cfg_read (cfg)==-1)
-    exit (1);
-  
-  driver=cfg_get("display",NULL);
-  if (driver==NULL || *driver=='\0') {
-    error ("missing 'display' entry in %s!", cfg_file());
-    exit (1);
+    background=1;
   }
   
   debug ("initializing driver %s", driver);