/* cloexec.c - set or clear the close-on-exec descriptor flag

   Copyright (C) 2004, 2009-2018 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 <https://www.gnu.org/licenses/>.

*/

#include <stdbool.h>

/* Set the 'FD_CLOEXEC' flag of DESC if VALUE is true,

   or clear the flag if VALUE is false.

   Return 0 on success, or -1 on error with 'errno' set.

   Note that on MingW, this function does NOT protect DESC from being

   inherited into spawned children.  Instead, either use dup_cloexec

   followed by closing the original DESC, or use interfaces such as

   open or pipe2 that accept flags like O_CLOEXEC to create DESC

   non-inheritable in the first place.  */

int set_cloexec_flag (int desc, bool value);

/* Duplicates a file handle FD, while marking the copy to be closed

   prior to exec or spawn.  Returns -1 and sets errno if FD could not

   be duplicated.  */

int dup_cloexec (int fd);