Add support for fcntl(fd, F_CLOSEM) to close filedescriptors.

[bacula/bacula] / bacula / src / lib / daemon.c

diff --git a/bacula/src/lib/daemon.c b/bacula/src/lib/daemon.c
index 678a5e07f311aeb84582dea2a8625cd88c06ee8b..72b3365caaa7cabba83aa51942e72f771df251c3 100644 (file)
--- a/bacula/src/lib/daemon.c
+++ b/bacula/src/lib/daemon.c
@@ -1,67 +1,103 @@
 /*
- *  daemon.c by Kern Sibbald
- *
- *   Version $Id$
- *
- *   this code is inspired by the Prentice Hall book
- *   "Unix Network Programming" by W. Richard Stevens
- *   and later updated from his book "Advanced Programming
- *   in the UNIX Environment"
- *
- * Initialize a daemon process completely detaching us from
- * any terminal processes. 
- *
- */ 
+   Bacula® - The Network Backup Solution
 
-/*
-   Copyright (C) 2000-2004 Kern Sibbald and John Walker
+   Copyright (C) 2000-2011 Free Software Foundation Europe e.V.
 
-   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.
+   The main author of Bacula is Kern Sibbald, with contributions from
+   many others, a complete list can be found in the file AUTHORS.
+   This program is Free Software; you can redistribute it and/or
+   modify it under the terms of version three of the GNU Affero General Public
+   License as published by the Free Software Foundation and included
+   in the file LICENSE.
 
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   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., 59 Temple Place - Suite 330, Boston,
-   MA 02111-1307, USA.
+   You should have received a copy of the GNU Affero General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA.
 
+   Bacula® is a registered trademark of Kern Sibbald.
+   The licensor of Bacula is the Free Software Foundation Europe
+   (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
+   Switzerland, email:ftf@fsfeurope.org.
+*/
+/*
+ *  daemon.c by Kern Sibbald 2000
+ *
+ *   This code is inspired by the Prentice Hall book
+ *   "Unix Network Programming" by W. Richard Stevens
+ *   and later updated from his book "Advanced Programming
+ *   in the UNIX Environment"
+ *
+ * Initialize a daemon process completely detaching us from
+ * any terminal processes.
+ *
  */
 
 
 #include "bacula.h"
+extern int debug_level;
 
-void 
+void
 daemon_start()
 {
-#if !defined(HAVE_CYGWIN) && !defined(HAVE_WIN32)
+#if !defined(HAVE_WIN32)
    int i;
+   int fd;
    pid_t cpid;
    mode_t oldmask;
+#ifdef DEVELOPER
+   int low_fd = 2;
+#else
+   int low_fd = -1;
+#endif
    /*
     *  Become a daemon.
     */
 
-   Dmsg0(200, "Enter daemon_start\n");
-   if ( (cpid = fork() ) < 0)
-      Emsg1(M_ABORT, 0, "Cannot fork to become daemon: %s\n", strerror(errno));
-   else if (cpid > 0)
-      exit(0);             /* parent exits */
+   Dmsg0(900, "Enter daemon_start\n");
+   if ( (cpid = fork() ) < 0) {
+      berrno be;
+      Emsg1(M_ABORT, 0, _("Cannot fork to become daemon: ERR=%s\n"), be.bstrerror());
+   } else if (cpid > 0) {
+      exit(0);              /* parent exits */
+   }
    /* Child continues */
-      
+
    setsid();
 
    /* In the PRODUCTION system, we close ALL
     * file descriptors except stdin, stdout, and stderr.
     */
-   for (i=sysconf(_SC_OPEN_MAX)-1; i > 2; i--) {
+   if (debug_level > 0) {
+      low_fd = 2;                     /* don't close debug output */
+   }
+
+#if defined(HAVE_FCNTL_F_CLOSEM)
+   /*
+    * fcntl(fd, F_CLOSEM) needs the minimum filedescriptor
+    * to close. the current code sets the last one to keep
+    * open. So increment it with 1 and use that as argument.
+    */
+   low_fd++;
+   fcntl(low_fd, F_CLOSEM);
+#elif defined(HAVE_CLOSEFROM)
+   /*
+    * closefrom needs the minimum filedescriptor to close.
+    * the current code sets the last one to keep open.
+    * So increment it with 1 and use that as argument.
+    */
+   low_fd++;
+   closefrom(low_fd);
+#else
+   for (i=sysconf(_SC_OPEN_MAX)-1; i > low_fd; i--) {
       close(i);
    }
+#endif
 
    /* Move to root directory. For debug we stay
     * in current directory so dumps go there.
@@ -70,7 +106,7 @@ daemon_start()
    chdir("/");
 #endif
 
-   /* 
+   /*
     * Avoid creating files 666 but don't override any
     * more restrictive mask set by the user.
     */
@@ -78,7 +114,6 @@ daemon_start()
    oldmask |= 026;
    umask(oldmask);
 
-   Dmsg0(200, "Exit daemon_start\n");
 
    /*
     * Make sure we have fd's 0, 1, 2 open
@@ -87,15 +122,15 @@ daemon_start()
     *  send total garbage to our socket.
     *
     */
-   int fd;
    fd = open("/dev/null", O_RDONLY, 0644);
    if (fd > 2) {
       close(fd);
    } else {
       for(i=1; fd + i <= 2; i++) {
-        dup2(fd, fd+i);
+         dup2(fd, fd+i);
       }
    }
 
-#endif /* HAVE_CYGWIN */
+#endif /* HAVE_WIN32 */
+   Dmsg0(900, "Exit daemon_start\n");
 }