mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-27 04:52:05 +08:00
dc6c21dabf
This updates gnulib to a relatively recent commit. Most of this was done by the gnulib import script; the only change I made was to update-gnulib.sh. Tested on x86-64 Fedora 34. I also did a mingw cross build.
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/* Return a safer copy of a file descriptor.
|
|
|
|
Copyright (C) 2005-2006, 2009-2022 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/>. */
|
|
|
|
/* Written by Paul Eggert. */
|
|
|
|
#include <config.h>
|
|
|
|
#include "unistd-safer.h"
|
|
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
|
|
/* Return FD, unless FD would be a copy of standard input, output, or
|
|
error; in that case, return a duplicate of FD, closing FD. On
|
|
failure to duplicate, close FD, set errno, and return -1. Preserve
|
|
errno if FD is negative, so that the caller can always inspect
|
|
errno when the returned value is negative.
|
|
|
|
This function is usefully wrapped around functions that return file
|
|
descriptors, e.g., fd_safer (open ("file", O_RDONLY)). */
|
|
|
|
int
|
|
fd_safer (int fd)
|
|
{
|
|
if (STDIN_FILENO <= fd && fd <= STDERR_FILENO)
|
|
{
|
|
int f = dup_safer (fd);
|
|
int e = errno;
|
|
close (fd);
|
|
errno = e;
|
|
fd = f;
|
|
}
|
|
|
|
return fd;
|
|
}
|