X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Fdaemon_with_notify%2F_info;fp=ccan%2Fdaemon_with_notify%2F_info;h=6f26898e2a60326e73e79acdf3eb9759b1d9fb1f;hp=0000000000000000000000000000000000000000;hb=aaf830998ef2dc127dd09f30fc9a2156e0634a57;hpb=bd12721599802b1a91513ae56c0ab002890c60b0

diff --git a/ccan/daemon_with_notify/_info b/ccan/daemon_with_notify/_info
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+#include <stdio.h>
+#include <string.h>
+#include "config.h"
+
+/**
+ * daemon_with_notify - daemonize a process, can wait for child to signal readiness
+ *
+ * Daemons should detach themselves thoroughly from the process which launched
+ * them, and not prevent any filesystems from being unmounted.  daemonize()
+ * helps with the process.
+ *
+ * Daemon-with-notify is different in that the child can send a SIGUSR1 to
+ * the parent to indicate it has started (e.g. after memory allocation and
+ * other things that may fail) so that the parent can return a success or
+ * failing exit code and init scripts can pick this up easily.
+ *
+ * Example:
+ *	#include <ccan/daemon_with_notify/daemon_with_notify.h>
+ *	#include <ccan/str/str.h>
+ *	#include <err.h>
+ *	#include <unistd.h>
+ *	#include <stdlib.h>
+ *	
+ *	static void usage(const char *name)
+ *	{
+ *		errx(1, "Usage: %s [--daemonize]\n", name);
+ *	}
+ *	
+ *	// Wait for a minute, possibly as a daemon.
+ *	int main(int argc, char *argv[])
+ *	{
+ *		if (argc != 1) {
+ *			if (argc == 2 && streq(argv[1], "--daemonize")) {
+ *				if (!daemonize(1, 1, 1))
+ *					err(1, "Failed to become daemon");
+ *			} else
+ *				usage(argv[1]);
+ *		}
+ *		sleep(10); // do some init here
+ *		daemon_is_ready();
+ *		sleep(20); // will be done in child, detached from parent
+ *		exit(0);
+ *	}
+ *
+ * License: BSD
+ * Author: Stewart Smith <stewart@flamingspork.com>
+ */
+int main(int argc, char *argv[])
+{
+	if (argc != 2)
+		return 1;
+
+	if (strcmp(argv[1], "depends") == 0) {
+		return 0;
+	}
+
+	if (strcmp(argv[1], "libs") == 0) {
+		return 0;
+	}
+
+	return 1;
+}
+