kc3-lang/gnulib/lib/dup-safer-flag.c

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• Hash : ffb0b299
  Author :
  Date : 2010-09-10T11:55:27
  

  fcntl-h: define O_CLOEXEC and O_EXEC if not defined; use new defines
  
  * doc/posix-headers/fcntl.texi (fcntl.h): Document that
  O_CLOEXEC is now defined to 0 if it is not defined, like other flags.
  Also, O_EXEC is now defined to be O_RDONLY if O_EXEC is not defined.
  Similarly for O_SEARCH; this last was already true, but not documented.
  * lib/fcntl.in.h (O_CLOEXEC): Define to 0 if not defined.
  * lib/dup-safer-flag.c (O_CLOEXEC): Remove now-useless #define.
  * lib/dup3.c, lib/pipe2.c, tests/test-dup-safer.c, tests/test-fcntl.c:
  Likewise.
  * lib/popen-safer.c (open_noinherit): Check whether O_CLOEXEC
  is zero, not whether it is defined.
  * tests/test-dup3.c, tests/test-pipe2.c (main): Likewise.
  * lib/progreloc.c (find_executable): Use O_EXEC rather than O_RDONLY.
  * lib/open.c (open): Check for O_SEARCH as well as for O_RDONLY.
  

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• lib/dup-safer-flag.c

• /* Duplicate a file descriptor result, avoiding clobbering
     STD{IN,OUT,ERR}_FILENO, with specific flags.
  
     Copyright (C) 2001, 2004-2006, 2009-2010 Free Software Foundation, Inc.
  
     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 3 of the License, or
     (at your option) any later version.
  
     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, see <http://www.gnu.org/licenses/>.  */
  
  /* Written by Paul Eggert and Eric Blake.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "unistd-safer.h"
  
  #include <fcntl.h>
  #include <unistd.h>
  
  #include "cloexec.h"
  
  /* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
     STDERR_FILENO.  If FLAG contains O_CLOEXEC, behave like
     fcntl(F_DUPFD_CLOEXEC) rather than fcntl(F_DUPFD).  */
  
  int
  dup_safer_flag (int fd, int flag)
  {
    return fcntl (fd, (flag & O_CLOEXEC) ? F_DUPFD_CLOEXEC : F_DUPFD,
                  STDERR_FILENO + 1);
  }
  

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