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glibc/posix/tst-truncate.c
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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; | |
} |