fd-safer.c

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/home/opencoverage/opencoverage/guest-scripts/coreutils/src/gnulib/lib/fd-safer.c

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/* Return a safer copy of a file descriptor.

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)

0 <= fd	Description
TRUE	evaluated 87721 times by 15 tests Evaluated by: chgrp chmod chown cp df du ginstall mkdir mv rm shred split stat tac tail
FALSE	evaluated 328 times by 8 tests Evaluated by: cp du ginstall rm shred split tac tail

fd <= 2	Description
TRUE	evaluated 5 times by 3 tests Evaluated by: cp tac tail
FALSE	evaluated 87716 times by 15 tests Evaluated by: chgrp chmod chown cp df du ginstall mkdir mv rm shred split stat tac tail

5-87721

{

int f = dup_safer (fd);

int e = errno;

close (fd);

errno = e;

fd = f;

}

executed 5 times by 3 tests: end of block

Executed by:

cp
tac
tail

return fd;

executed 88049 times by 15 tests: return fd;

Executed by:

chgrp
chmod
chown
cp
df
du
ginstall
mkdir
mv
rm
shred
split
stat
tac
tail

88049

}

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