move daemon-with-notify to daemon_with_notify as dashes aren't allowed in CCAN module...

[ccan] / ccan / daemon_with_notify / daemon_with_notify.c

diff --git a/ccan/daemon_with_notify/daemon_with_notify.c b/ccan/daemon_with_notify/daemon_with_notify.c
new file mode 100644 (file)
index 0000000..bcc627b
--- /dev/null
+++ b/ccan/daemon_with_notify/daemon_with_notify.c
@@ -0,0 +1,131 @@
+/*-
+ * Copyright (c) 1990, 1993
+ *    The Regents of the University of California.  All rights reserved.
+ * Copyright (c) 2010
+ *    Stewart Smith
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <unistd.h>
+#include <sys/select.h>
+
+#include <ccan/daemon_with_notify/daemon_with_notify.h>
+
+void sigusr1_handler(int sig);
+
+pid_t parent_pid;
+
+void sigusr1_handler(int sig)
+{
+  if (sig == SIGUSR1)
+    _exit(EXIT_SUCCESS);
+}
+
+int daemon_is_ready(void)
+{
+  kill(parent_pid, SIGUSR1);
+  return 0;
+}
+
+int daemonize(int nochdir, int noclose, int wait_sigusr1)
+{
+    int fd;
+    pid_t child= -1;
+
+    parent_pid= getpid();
+    signal(SIGUSR1, sigusr1_handler);
+
+    child= fork();
+
+    switch (child)
+    {
+    case -1:
+        return (-1);
+    case 0:
+        break;
+    default:
+      if (wait_sigusr1)
+      {
+        /* parent */
+        int exit_code= -1;
+        int status;
+        while (waitpid(child, &status, 0) != child);
+        if (WIFEXITED(status))
+        {
+          exit_code= WEXITSTATUS(status);
+        }
+        if (WIFSIGNALED(status))
+        {
+          exit_code= -1;
+        }
+        _exit(exit_code);
+      }
+      else
+      {
+        _exit(EXIT_SUCCESS);
+      }
+    }
+
+    /* child */
+    if (setsid() == -1)
+        return (-1);
+
+    if (nochdir == 0) {
+        if(chdir("/") != 0) {
+            perror("chdir");
+            return (-1);
+        }
+    }
+
+    if (noclose == 0 && (fd = open("/dev/null", O_RDWR, 0)) != -1) {
+        if(dup2(fd, STDIN_FILENO) < 0) {
+            perror("dup2 stdin");
+            return (-1);
+        }
+        if(dup2(fd, STDOUT_FILENO) < 0) {
+            perror("dup2 stdout");
+            return (-1);
+        }
+        if(dup2(fd, STDERR_FILENO) < 0) {
+            perror("dup2 stderr");
+            return (-1);
+        }
+
+        if (fd > STDERR_FILENO) {
+            if(close(fd) < 0) {
+                perror("close");
+                return (-1);
+            }
+        }
+    }
+    return (0);
+}