+/*
+ * mydaemon creates a pipe between the partent and child
+ * process. The parent process will wait until the
+ * child dies or writes a '1' on the pipe signaling
+ * that it started successfully.
+ */
+int pipefds[2] = { -1, -1};
+
+void
+mydaemon(int nochdir, int noclose)
+{
+ int pid, status, tempfd;
+
+ if (pipe(pipefds) < 0)
+ err(1, "mydaemon: pipe() failed: errno %d", errno);
+
+ if ((pid = fork ()) < 0)
+ err(1, "mydaemon: fork() failed: errno %d", errno);
+
+ if (pid != 0) {
+ /*
+ * Parent. Wait for status from child.
+ */
+ close(pipefds[1]);
+ if (read(pipefds[0], &status, 1) != 1)
+ exit(1);
+ exit (0);
+ }
+ /* Child. */
+ close(pipefds[0]);
+ setsid ();
+ if (nochdir == 0) {
+ if (chdir ("/") == -1)
+ err(1, "mydaemon: chdir() failed: errno %d", errno);
+ }
+
+ while (pipefds[1] <= 2) {
+ pipefds[1] = dup(pipefds[1]);
+ if (pipefds[1] < 0)
+ err(1, "mydaemon: dup() failed: errno %d", errno);
+ }
+
+ if (noclose == 0) {
+ tempfd = open("/dev/null", O_RDWR);
+ if (tempfd < 0)
+ tempfd = open("/", O_RDONLY);
+ if (tempfd >= 0) {
+ dup2(tempfd, 0);
+ dup2(tempfd, 1);
+ dup2(tempfd, 2);
+ close(tempfd);
+ } else {
+ err(1, "mydaemon: can't open /dev/null: errno %d",
+ errno);
+ exit(1);
+ }
+ }
+
+ return;
+}
+void
+release_parent(void)
+{
+ int status;
+
+ if (pipefds[1] > 0) {
+ if (write(pipefds[1], &status, 1) != 1) {
+ err(1, "Writing to parent pipe failed: errno %d (%s)\n",
+ errno, strerror(errno));
+ }
+ close(pipefds[1]);
+ pipefds[1] = -1;
+ }
+}