From 1b4b2a291d9a8e2ad2fa0771e7386a3f6d89512d Mon Sep 17 00:00:00 2001
From: Jelmer Vernooij <jelmer@samba.org>
Date: Fri, 3 Nov 2006 01:49:19 +0000
Subject: r19539: Move pidfile to smbd/ (This used to be commit
 eefa64cbe392c4c4dcbf71b8bcf5128cce0339ba)

---
 source4/smbd/pidfile.c | 121 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 source4/smbd/pidfile.c

(limited to 'source4/smbd/pidfile.c')

diff --git a/source4/smbd/pidfile.c b/source4/smbd/pidfile.c
new file mode 100644
index 0000000000..493de66b44
--- /dev/null
+++ b/source4/smbd/pidfile.c
@@ -0,0 +1,121 @@
+/* this code is broken - there is a race condition with the unlink (tridge) */
+
+/* 
+   Unix SMB/CIFS implementation.
+   pidfile handling
+   Copyright (C) Andrew Tridgell 1998
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+#include "system/filesys.h"
+
+/**
+ * @file
+ * @brief Pid file handling
+ */
+
+/**
+ * return the pid in a pidfile. return 0 if the process (or pidfile)
+ * does not exist 
+ */
+pid_t pidfile_pid(const char *name)
+{
+	int fd;
+	char pidstr[20];
+	pid_t ret;
+	char *pidFile;
+
+	asprintf(&pidFile, "%s/%s.pid", lp_piddir(), name);
+
+	fd = open(pidFile, O_NONBLOCK | O_RDONLY, 0644);
+
+	if (fd == -1) {
+		SAFE_FREE(pidFile);
+		return 0;
+	}
+
+	ZERO_STRUCT(pidstr);
+
+	if (read(fd, pidstr, sizeof(pidstr)-1) <= 0) {
+		goto noproc;
+	}
+
+	ret = (pid_t)atoi(pidstr);
+	
+	if (!process_exists(ret)) {
+		goto noproc;
+	}
+
+	if (fcntl_lock(fd,F_SETLK,0,1,F_RDLCK)) {
+		/* we could get the lock - it can't be a Samba process */
+		goto noproc;
+	}
+
+	close(fd);
+	SAFE_FREE(pidFile);
+	return ret;
+
+ noproc:
+	close(fd);
+	unlink(pidFile);
+	SAFE_FREE(pidFile);
+	return 0;
+}
+
+/**
+ * create a pid file in the pid directory. open it and leave it locked 
+ */
+void pidfile_create(const char *name)
+{
+	int     fd;
+	char    buf[20];
+	char *pidFile;
+	pid_t pid;
+
+	asprintf(&pidFile, "%s/%s.pid", lp_piddir(), name);
+
+	pid = pidfile_pid(name);
+	if (pid != 0) {
+		DEBUG(0,("ERROR: %s is already running. File %s exists and process id %d is running.\n", 
+			 name, pidFile, (int)pid));
+		exit(1);
+	}
+
+	fd = open(pidFile, O_NONBLOCK | O_CREAT | O_WRONLY | O_EXCL, 0644);
+	if (fd == -1) {
+		DEBUG(0,("ERROR: can't open %s: Error was %s\n", pidFile, 
+			 strerror(errno)));
+		exit(1);
+	}
+
+	if (fcntl_lock(fd,F_SETLK,0,1,F_WRLCK)==False) {
+		DEBUG(0,("ERROR: %s : fcntl lock of file %s failed. Error was %s\n",  
+              name, pidFile, strerror(errno)));
+		exit(1);
+	}
+
+	memset(buf, 0, sizeof(buf));
+	slprintf(buf, sizeof(buf) - 1, "%u\n", (unsigned int) getpid());
+	if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) {
+		DEBUG(0,("ERROR: can't write to file %s: %s\n", 
+			 pidFile, strerror(errno)));
+		exit(1);
+	}
+
+	/* Leave pid file open & locked for the duration... */
+	SAFE_FREE(pidFile);
+}
-- 
cgit