From f8118473a734551268514d16f4169bce3a968965 Mon Sep 17 00:00:00 2001
From: Marco van Wieringen <mvw@planets.elm.net>
Date: Thu, 19 Apr 2012 14:05:34 +0200
Subject: [PATCH] Use closefrom if available instead of trying to close fds
 ourself.

---
 bacula/autoconf/config.h.in  |  3 +++
 bacula/autoconf/configure.in |  1 +
 bacula/src/lib/daemon.c      | 13 ++++++++++++-
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/bacula/autoconf/config.h.in b/bacula/autoconf/config.h.in
index dc367ddcc9..8a75168460 100644
--- a/bacula/autoconf/config.h.in
+++ b/bacula/autoconf/config.h.in
@@ -280,6 +280,9 @@
 /* Define to 1 if you have the `chflags' function. */
 #undef HAVE_CHFLAGS
 
+/* Define to 1 if you have the 'closefrom' function. */
+#undef HAVE_CLOSEFROM
+
 /* Set if Bacula conio support enabled */
 #undef HAVE_CONIO
 
diff --git a/bacula/autoconf/configure.in b/bacula/autoconf/configure.in
index fb9bb57487..1e11daae26 100644
--- a/bacula/autoconf/configure.in
+++ b/bacula/autoconf/configure.in
@@ -2347,6 +2347,7 @@ AC_CHECK_FUNCS( \
    [echo 'configure: cannot find needed function.'; exit 1]
 )
 
+AC_CHECK_FUNC(closefrom, [AC_DEFINE(HAVE_CLOSEFROM, 1, [Define to 1 if you have the 'closefrom' function.])])
 AC_CHECK_FUNCS(getpagesize, [AC_DEFINE(HAVE_GETPAGESIZE, 1, [Set if have getpagesize])])
 AC_CHECK_FUNCS(malloc_trim, [AC_DEFINE(HAVE_MALLOC_TRIM, 1, [Set if have malloc_trim])])
 
diff --git a/bacula/src/lib/daemon.c b/bacula/src/lib/daemon.c
index 3a25812c1e..e736b36217 100644
--- a/bacula/src/lib/daemon.c
+++ b/bacula/src/lib/daemon.c
@@ -47,6 +47,7 @@ daemon_start()
 {
 #if !defined(HAVE_WIN32)
    int i;
+   int fd;
    pid_t cpid;
    mode_t oldmask;
 #ifdef DEVELOPER
@@ -75,9 +76,20 @@ daemon_start()
    if (debug_level > 0) {
       low_fd = 2;                     /* don't close debug output */
    }
+
+#ifdef 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.
@@ -102,7 +114,6 @@ daemon_start()
     *  send total garbage to our socket.
     *
     */
-   int fd;
    fd = open("/dev/null", O_RDONLY, 0644);
    if (fd > 2) {
       close(fd);
-- 
2.39.5