1 /* -*- buffer-read-only: t -*- vi: set ro: */
2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
3 /* closexec.c - set or clear the close-on-exec descriptor flag
5 Copyright (C) 1991, 2004-2006, 2009-2013 Free Software Foundation, Inc.
7 This program is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 The code is taken from glibc/manual/llio.texi */
30 /* Set the 'FD_CLOEXEC' flag of DESC if VALUE is true,
31 or clear the flag if VALUE is false.
32 Return 0 on success, or -1 on error with 'errno' set.
34 Note that on MingW, this function does NOT protect DESC from being
35 inherited into spawned children. Instead, either use dup_cloexec
36 followed by closing the original DESC, or use interfaces such as
37 open or pipe2 that accept flags like O_CLOEXEC to create DESC
38 non-inheritable in the first place. */
41 set_cloexec_flag (int desc, bool value)
45 int flags = fcntl (desc, F_GETFD, 0);
49 int newflags = (value ? flags | FD_CLOEXEC : flags & ~FD_CLOEXEC);
52 || fcntl (desc, F_SETFD, newflags) != -1)
60 /* Use dup2 to reject invalid file descriptors; the cloexec flag
61 will be unaffected. */
67 if (dup2 (desc, desc) < 0)
68 /* errno is EBADF here. */
71 /* There is nothing we can do on this kind of platform. Punt. */
77 /* Duplicates a file handle FD, while marking the copy to be closed
78 prior to exec or spawn. Returns -1 and sets errno if FD could not
84 return fcntl (fd, F_DUPFD_CLOEXEC, 0);