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/* Tests for ftruncate and truncate.
Copyright (C) 2000-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <error.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
/* Allow testing of the 64-bit versions as well. */
#ifndef TRUNCATE
# define TRUNCATE truncate
# define FTRUNCATE ftruncate
#endif
#define STRINGIFY(s) STRINGIFY2 (s)
#define STRINGIFY2(s) #s
/* Prototype for our test function. */
extern void do_prepare (int argc, char *argv[]);
extern int do_test (int argc, char *argv[]);
/* We have a preparation function. */
#define PREPARE do_prepare
/* We might need a bit longer timeout. */
#define TIMEOUT 20 /* sec */
/* This defines the `main' function and some more. */
#include <test-skeleton.c>
/* These are for the temporary file we generate. */
char *name;
int fd;
void
do_prepare (int argc, char *argv[])
{
size_t name_len;
#define FNAME FNAME2(TRUNCATE)
#define FNAME2(s) "/" STRINGIFY(s) "XXXXXX"
name_len = strlen (test_dir);
name = malloc (name_len + sizeof (FNAME));
mempcpy (mempcpy (name, test_dir, name_len), FNAME, sizeof (FNAME));
add_temp_file (name);
/* Open our test file. */
fd = mkstemp (name);
if (fd == -1)
error (EXIT_FAILURE, errno, "cannot open test file `%s'", name);
}
int
do_test (int argc, char *argv[])
{
struct stat st;
char buf[1000];
memset (buf, '\0', sizeof (buf));
if (write (fd, buf, sizeof (buf)) != sizeof (buf))
error (EXIT_FAILURE, errno, "during write");
if (fstat (fd, &st) < 0 || st.st_size != sizeof (buf))
error (EXIT_FAILURE, 0, "initial size wrong");
if (FTRUNCATE (fd, 800) < 0)
error (EXIT_FAILURE, errno, "size reduction with %s failed",
STRINGIFY (FTRUNCATE));
if (fstat (fd, &st) < 0 || st.st_size != 800)
error (EXIT_FAILURE, 0, "size after reduction with %s incorrect",
STRINGIFY (FTRUNCATE));
/* The following test covers more than POSIX. POSIX does not require
that ftruncate() can increase the file size. But we are testing
Unix systems. */
if (FTRUNCATE (fd, 1200) < 0)
error (EXIT_FAILURE, errno, "size increase with %s failed",
STRINGIFY (FTRUNCATE));
if (fstat (fd, &st) < 0 || st.st_size != 1200)
error (EXIT_FAILURE, 0, "size after increase with %s incorrect",
STRINGIFY (FTRUNCATE));
if (TRUNCATE (name, 800) < 0)
error (EXIT_FAILURE, errno, "size reduction with %s failed",
STRINGIFY (TRUNCATE));
if (fstat (fd, &st) < 0 || st.st_size != 800)
error (EXIT_FAILURE, 0, "size after reduction with %s incorrect",
STRINGIFY (TRUNCATE));
/* The following test covers more than POSIX. POSIX does not require
that truncate() can increase the file size. But we are testing
Unix systems. */
if (TRUNCATE (name, 1200) < 0)
error (EXIT_FAILURE, errno, "size increase with %s failed",
STRINGIFY (TRUNCATE));
if (fstat (fd, &st) < 0 || st.st_size != 1200)
error (EXIT_FAILURE, 0, "size after increase with %s incorrect",
STRINGIFY (TRUNCATE));
close (fd);
unlink (name);
return 0;
}
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