1 /* cloexec.c - set or clear the close-on-exec descriptor flag 2 3 Copyright (C) 2004, 2009-2021 Free Software Foundation, Inc. 4 5 This file is free software: you can redistribute it and/or modify 6 it under the terms of the GNU Lesser General Public License as 7 published by the Free Software Foundation; either version 2.1 of the 8 License, or (at your option) any later version. 9 10 This file 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 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public License 16 along with this program. If not, see <https://www.gnu.org/licenses/>. */ 17 18 #include <stdbool.h> 19 20 /* Set the 'FD_CLOEXEC' flag of DESC if VALUE is true, 21 or clear the flag if VALUE is false. 22 Return 0 on success, or -1 on error with 'errno' set. 23 24 Note that on MingW, this function does NOT protect DESC from being 25 inherited into spawned children. Instead, either use dup_cloexec 26 followed by closing the original DESC, or use interfaces such as 27 open or pipe2 that accept flags like O_CLOEXEC to create DESC 28 non-inheritable in the first place. */ 29 30 int set_cloexec_flag (int desc, bool value); 31 32 /* Duplicates a file handle FD, while marking the copy to be closed 33 prior to exec or spawn. Returns -1 and sets errno if FD could not 34 be duplicated. */ 35 36 int dup_cloexec (int fd);