lib/cloexec.h

   1 /* cloexec.c - set or clear the close-on-exec descriptor flag
   2
   3    Copyright (C) 2004, 2009-2017 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.
  17
  18 */
  19
  20 #include <stdbool.h>
  21
  22 /* Set the 'FD_CLOEXEC' flag of DESC if VALUE is true,
  23    or clear the flag if VALUE is false.
  24    Return 0 on success, or -1 on error with 'errno' set.
  25
  26    Note that on MingW, this function does NOT protect DESC from being
  27    inherited into spawned children.  Instead, either use dup_cloexec
  28    followed by closing the original DESC, or use interfaces such as
  29    open or pipe2 that accept flags like O_CLOEXEC to create DESC
  30    non-inheritable in the first place.  */
  31
  32 int set_cloexec_flag (int desc, bool value);
  33
  34 /* Duplicates a file handle FD, while marking the copy to be closed
  35    prior to exec or spawn.  Returns -1 and sets errno if FD could not
  36    be duplicated.  */
  37
  38 int dup_cloexec (int fd);