Do not use the C library's daemon() call.

[tinc] / src / process.c

diff --git a/src/process.c b/src/process.c
index 29e49fa..33828bb 100644 (file)
--- a/src/process.c
+++ b/src/process.c
@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: process.c,v 1.1.2.10 2000/11/22 19:14:08 guus Exp $
+    $Id: process.c,v 1.1.2.13 2000/11/24 12:44:39 zarq Exp $
 */
 
 #include "config.h"
@@ -31,7 +31,9 @@
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <stdlib.h>
 #include <unistd.h>
+#include <termios.h>
 
 #include <list.h>
 #include <pidfile.h>
@@ -40,6 +42,8 @@
 
 #include "conf.h"
 #include "process.h"
+#include "subnet.h"
+#include "connection.h"
 
 #include "system.h"
 
@@ -69,6 +73,58 @@ void memory_full(int size)
   exit(1);
 }
 
+/* Some functions the less gifted operating systems might lack... */
+
+#ifndef HAVE_FCLOSEALL
+int fcloseall(void)
+{
+  fflush(stdin);
+  fflush(stdout);
+  fflush(stderr);
+  fclose(stdin);
+  fclose(stdout);
+  fclose(stderr);
+}
+#endif
+
+int become_daemon(void)
+{
+  pid_t pid;
+  int fd;
+  
+  ppid = getpid();
+
+  if((pid = fork()) < 0)
+    {
+      perror("fork");
+      return -1;
+    }
+  if(pid) /* parent process */
+    {
+      signal(SIGTERM, parent_exit);
+      sleep(600); /* wait 10 minutes */
+      exit(1);
+    }
+
+  if((fd = open("/dev/tty", O_RDWR)) >= 0)
+    {
+      if(ioctl(fd, TIOCNOTTY, NULL))
+        {
+          perror("ioctl");
+          return -1;
+        }
+      close(fd);
+    }
+
+  if(setsid() < 0)
+    return -1;
+
+  kill(ppid, SIGTERM);
+
+  chdir("/");
+  fcloseall();
+}
+
 /*
   Close network connections, and terminate neatly
 */
@@ -140,13 +196,12 @@ cp
 */
 int detach(void)
 {
-  int fd;
-  pid_t pid;
 cp
   setup_signals();
 
   if(do_detach)
-    daemon(0, 0);
+    if(become_daemon() < 0)
+      return -1;
 
   if(write_pidfile())
     return -1;