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author | Dan Willemsen <dwillemsen@google.com> | 2019-02-18 13:40:03 -0800 |
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committer | Dan Willemsen <dwillemsen@google.com> | 2019-02-18 13:40:03 -0800 |
commit | ea2b8a1c079d9184f53277f95a4d52c3c5a9f019 (patch) | |
tree | 5ec9aa82542909ecfc0859277d941528857a59b7 /lib/cloexec.h | |
parent | cfddd4f332465a447e87b4c1523fb2b9133e7afd (diff) | |
download | m4-ea2b8a1c079d9184f53277f95a4d52c3c5a9f019.tar.gz |
Add 1.4.18 tarball contentsupstream
Test: none
Change-Id: Id75707b7a41aaaaf33046cf541bcb19ecb4d5851
Diffstat (limited to 'lib/cloexec.h')
-rw-r--r-- | lib/cloexec.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/lib/cloexec.h b/lib/cloexec.h new file mode 100644 index 0000000..0e58437 --- /dev/null +++ b/lib/cloexec.h @@ -0,0 +1,38 @@ +/* closexec.c - set or clear the close-on-exec descriptor flag + + Copyright (C) 2004, 2009-2016 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/>. + +*/ + +#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); |