safe-read.c

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/home/opencoverage/opencoverage/guest-scripts/coreutils/src/gnulib/lib/safe-read.c

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/* An interface to read and write that retries after interrupts.

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/>. */

#include <config.h>

/* Specification. */

#ifdef SAFE_WRITE

# include "safe-write.h"

#else

# include "safe-read.h"

#endif

/* Get ssize_t. */

#include <sys/types.h>

#include <unistd.h>

#include <errno.h>

#ifdef EINTR

# define IS_EINTR(x) ((x) == EINTR)

#else

# define IS_EINTR(x) 0

#endif

#include <limits.h>

#ifdef SAFE_WRITE

# define safe_rw safe_write

# define rw write

#else

# define safe_rw safe_read

# define rw read

# undef const

# define const /* empty */

#endif

/* Read(write) up to COUNT bytes at BUF from(to) descriptor FD, retrying if

interrupted. Return the actual number of bytes read(written), zero for EOF,

or SAFE_READ_ERROR(SAFE_WRITE_ERROR) upon error. */

size_t

safe_rw (int fd, void const *buf, size_t count)

{

/* Work around a bug in Tru64 5.1. Attempting to read more than

INT_MAX bytes fails with errno == EINVAL. See

<https://lists.gnu.org/r/bug-gnu-utils/2002-04/msg00010.html>.

When decreasing COUNT, keep it block-aligned. */

enum { BUGGY_READ_MAXIMUM = INT_MAX & ~8191 };

for (;;)

{

ssize_t result = rw (fd, buf, count);

if (0 <= result)

0 <= result	Description
TRUE	evaluated 110726 times by 14 tests Evaluated by: cat cp csplit factor ginstall head mv split sum tac tail tr wc yes
FALSE	evaluated 168 times by 5 tests Evaluated by: cat split tac tail yes

168-110726

return result;

executed 110726 times by 14 tests: return result;

Executed by:

cat
cp
csplit
factor
ginstall
head
mv
split
sum
tac
tail
tr
wc
yes

110726

else if (IS_EINTR (errno))

(( (*__errno_l...n ()) ) == 4 )	Description
TRUE	never evaluated
FALSE	evaluated 168 times by 5 tests Evaluated by: cat split tac tail yes

0-168

continue;

never executed: continue;

else if (errno == EINVAL && BUGGY_READ_MAXIMUM < count)

(*__errno_location ()) == 22	Description
TRUE	evaluated 57 times by 1 test Evaluated by: tail
FALSE	evaluated 111 times by 5 tests Evaluated by: cat split tac tail yes

BUGGY_READ_MAXIMUM < count	Description
TRUE	never evaluated
FALSE	evaluated 57 times by 1 test Evaluated by: tail

0-111

count = BUGGY_READ_MAXIMUM;

never executed: count = BUGGY_READ_MAXIMUM;

else

return result;

executed 168 times by 5 tests: return result;

Executed by:

cat
split
tac
tail
yes

168

}

never executed: end of block

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