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Date:      Thu, 19 Jul 2012 10:22:55 +0000 (UTC)
From:      Konstantin Belousov <kib@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r238614 - in head/sys: kern sys
Message-ID:  <201207191022.q6JAMtbw068159@svn.freebsd.org>
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Author: kib
Date: Thu Jul 19 10:22:54 2012
New Revision: 238614
URL: http://svn.freebsd.org/changeset/base/238614

Log:
  Implement F_DUPFD_CLOEXEC command for fcntl(2), specified by SUSv4.
  
  PR:	  standards/169962
  Submitted by:	Jukka A. Ukkonen <jau iki fi>
  MFC after:	1 week

Modified:
  head/sys/kern/kern_descrip.c
  head/sys/sys/fcntl.h

Modified: head/sys/kern/kern_descrip.c
==============================================================================
--- head/sys/kern/kern_descrip.c	Thu Jul 19 09:32:59 2012	(r238613)
+++ head/sys/kern/kern_descrip.c	Thu Jul 19 10:22:54 2012	(r238614)
@@ -113,6 +113,7 @@ static uma_zone_t file_zone;
 /* Flags for do_dup() */
 #define DUP_FIXED	0x1	/* Force fixed allocation */
 #define DUP_FCNTL	0x2	/* fcntl()-style errors */
+#define	DUP_CLOEXEC	0x4	/* Atomically set FD_CLOEXEC. */
 
 static int	closefp(struct filedesc *fdp, int fd, struct file *fp,
 		    struct thread *td, int holdleaders);
@@ -479,6 +480,12 @@ kern_fcntl(struct thread *td, int fd, in
 		error = do_dup(td, DUP_FCNTL, fd, tmp, td->td_retval);
 		break;
 
+	case F_DUPFD_CLOEXEC:
+		tmp = arg;
+		error = do_dup(td, DUP_FCNTL | DUP_CLOEXEC, fd, tmp,
+		    td->td_retval);
+		break;
+
 	case F_DUP2FD:
 		tmp = arg;
 		error = do_dup(td, DUP_FIXED, fd, tmp, td->td_retval);
@@ -895,6 +902,10 @@ do_dup(struct thread *td, int flags, int
 	 * Duplicate the source descriptor.
 	 */
 	fdp->fd_ofiles[new] = fp;
+	if ((flags & DUP_CLOEXEC) != 0)
+		fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] | UF_EXCLOSE;
+	else
+		fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] & ~UF_EXCLOSE;
 	fdp->fd_ofileflags[new] = fdp->fd_ofileflags[old] &~ UF_EXCLOSE;
 	if (new > fdp->fd_lastfile)
 		fdp->fd_lastfile = new;

Modified: head/sys/sys/fcntl.h
==============================================================================
--- head/sys/sys/fcntl.h	Thu Jul 19 09:32:59 2012	(r238613)
+++ head/sys/sys/fcntl.h	Thu Jul 19 10:22:54 2012	(r238614)
@@ -225,6 +225,9 @@ typedef	__pid_t		pid_t;
 #define	F_SETLK_REMOTE	14		/* debugging support for remote locks */
 #define	F_READAHEAD	15		/* read ahead */
 #define	F_RDAHEAD	16		/* Darwin compatible read ahead */
+#if __BSD_VISIBLE || __POSIX_VISIBLE >= 200809
+#define	F_DUPFD_CLOEXEC	17		/* Like F_DUPFD, but FD_CLOEXEC is set */
+#endif
 
 /* file descriptor flags (F_GETFD, F_SETFD) */
 #define	FD_CLOEXEC	1		/* close-on-exec flag */

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