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From: Jilles Tjoelker <jilles@FreeBSD.org>
Date: Sat, 27 Apr 2013 13:26:36 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r249983 - head/usr.sbin/syslogd
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Author: jilles
Date: Sat Apr 27 13:26:35 2013
New Revision: 249983
URL: http://svnweb.freebsd.org/changeset/base/249983

Log:
  syslogd: Use closefrom() instead of getdtablesize()/close() loop.
  
  When syslogd forks a process for '|' destinations, it closes all file
  descriptors greater than 2.
  
  Use closefrom() for this instead of a getdtablesize()/close() loop because
  it is both faster and avoids leaving file descriptors open because the limit
  was lowered after they were opened.
  
  MFC after:	1 week

Modified:
  head/usr.sbin/syslogd/syslogd.c

Modified: head/usr.sbin/syslogd/syslogd.c
==============================================================================
--- head/usr.sbin/syslogd/syslogd.c	Sat Apr 27 12:50:07 2013	(r249982)
+++ head/usr.sbin/syslogd/syslogd.c	Sat Apr 27 13:26:35 2013	(r249983)
@@ -2476,7 +2476,7 @@ validate(struct sockaddr *sa, const char
 static int
 p_open(const char *prog, pid_t *rpid)
 {
-	int pfd[2], nulldesc, i;
+	int pfd[2], nulldesc;
 	pid_t pid;
 	sigset_t omask, mask;
 	char *argv[4]; /* sh -c cmd NULL */
@@ -2526,8 +2526,7 @@ p_open(const char *prog, pid_t *rpid)
 		dup2(pfd[0], STDIN_FILENO);
 		dup2(nulldesc, STDOUT_FILENO);
 		dup2(nulldesc, STDERR_FILENO);
-		for (i = getdtablesize(); i > 2; i--)
-			(void)close(i);
+		closefrom(3);
 
 		(void)execvp(_PATH_BSHELL, argv);
 		_exit(255);