1 files changed, 68 insertions, 0 deletions
diff --git a/libc/unistd/daemon.c b/libc/unistd/daemon.c
new file mode 100644
index 0000000..8181d16
--- /dev/null
+++ b/libc/unistd/daemon.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+int  daemon( int  nochdir, int  noclose )
+{
+   pid_t  pid;
+
+   if ( !nochdir && chdir("/") != 0 )
+       return -1;
+   
+   if ( !noclose )
+   {
+     int  fd = open("/dev/null", O_RDWR);
+
+     if ( fd < 0 )
+      return -1;
+
+     if ( dup2( fd, 0 ) < 0 ||
+	  dup2( fd, 1 ) < 0 ||
+          dup2( fd, 2 ) < 0 ) 
+     {
+       close(fd);
+      return -1;
+     }
+     close(fd);
+  }
+  
+   pid = fork();
+   if (pid < 0)
+    return -1;
+
+   if (pid > 0)
+    _exit(0);
+
+   if ( setsid() < 0 )
+     return -1;
+
+   return 0;
+}
+