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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Fri, 1 Apr 2011 12:52:55 +0000 (UTC)
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Subject: svn commit: r220242 - stable/8/lib/libc/sys
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Author: kib
Date: Fri Apr  1 12:52:55 2011
New Revision: 220242
URL: http://svn.freebsd.org/changeset/base/220242

Log:
  MFC r220000:
  Document O_CLOEXEC.

Modified:
  stable/8/lib/libc/sys/open.2
Directory Properties:
  stable/8/lib/libc/   (props changed)
  stable/8/lib/libc/stdtime/   (props changed)

Modified: stable/8/lib/libc/sys/open.2
==============================================================================
--- stable/8/lib/libc/sys/open.2	Fri Apr  1 12:50:29 2011	(r220241)
+++ stable/8/lib/libc/sys/open.2	Fri Apr  1 12:52:55 2011	(r220242)
@@ -28,7 +28,7 @@
 .\"     @(#)open.2	8.2 (Berkeley) 11/16/93
 .\" $FreeBSD$
 .\"
-.Dd February 28, 2009
+.Dd March 25, 2011
 .Dt OPEN 2
 .Os
 .Sh NAME
@@ -117,6 +117,7 @@ O_SYNC		synchronous writes
 O_NOFOLLOW	do not follow symlinks
 O_NOCTTY	don't assign controlling terminal
 O_TTY_INIT	restore default terminal attributes
+O_CLOEXEC	set FD_CLOEXEC upon open
 .Ed
 .Pp
 Opening a file with
@@ -222,6 +223,11 @@ The initial call to
 on a TTY will always restore default terminal attributes on
 .Fx .
 .Pp
+.Dv O_CLOEXEC
+may be used to set
+.Dv FD_CLOEXEC
+flag for the newly returned file descriptor.
+.Pp
 If successful,
 .Fn open
 returns a non-negative integer, termed a file descriptor.
@@ -232,12 +238,18 @@ file is set to the beginning of the file
 When a new file is created it is given the group of the directory
 which contains it.
 .Pp
-The new descriptor is set to remain open across
+Unless
+.Dv
+O_CLOEXEC
+flag was specified,
+the new descriptor is set to remain open across
 .Xr execve 2
 system calls; see
-.Xr close 2
+.Xr close 2 ,
+.Xr fcntl 2
 and
-.Xr fcntl 2 .
+.Dv O_CLOEXEC
+description.
 .Pp
 The system imposes a limit on the number of file descriptors
 open simultaneously by one process.