/*
*
* Copyright (c) International Business Machines Corp., 2001
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Test Name: pread02
*
* Test Description:
* Verify that,
* 1) pread() fails when attempted to read from an unnamed pipe.
* 2) pread() fails if the specified offset position was invalid.
*
* Expected Result:
* 1) pread() should return -1 and set errno to ESPIPE.
* 2) pread() should return -1 and set errno to EINVAL.
*
* Algorithm:
* Setup:
* Setup signal handling.
* Create a temporary directory.
* Pause for SIGUSR1 if option specified.
*
* Test:
* Loop if the proper options are given.
* Execute system call
* Check return code, if system call failed (return=-1)
* if errno set == expected errno
* Issue sys call fails with expected return value and errno.
* Otherwise,
* Issue sys call fails with unexpected errno.
* Otherwise,
* Issue sys call returns unexpected value.
*
* Cleanup:
* Print errno log and/or timing stats if options given
* Delete the temporary directory(s)/file(s) created.
*
* Usage: <for command-line>
* pread02 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
* where, -c n : Run n copies concurrently.
* -i n : Execute test n times.
* -I x : Execute test for x seconds.
* -P x : Pause for x seconds between iterations.
* -t : Turn on syscall timing.
*
* HISTORY
* 07/2001 Ported by Wayne Boyer
*
* RESTRICTIONS:
* None.
*/
#define _XOPEN_SOURCE 500
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include "test.h"
#include "safe_macros.h"
#define TEMPFILE "pread_file"
#define K1 1024
#define NBUFS 4
char *TCID = "pread02";
int TST_TOTAL = 2;
char *write_buf[NBUFS]; /* buffer to hold data to be written */
char *read_buf[NBUFS]; /* buffer to hold data read from file */
int pfd[2]; /* pair of file descriptors */
int fd1;
void setup(); /* Main setup function of test */
void cleanup(); /* cleanup function for the test */
int setup1(); /* setup function for test #1 */
int setup2(); /* setup function for test #2 */
int no_setup();
void init_buffers(); /* function to initialize/allocate buffers */
struct test_case_t { /* test case struct. to hold ref. test cond's */
int fd;
size_t nb;
off_t offst;
char *desc;
int exp_errno;
int (*setupfunc) ();
} Test_cases[] = {
{
1, K1, 0, "file descriptor is a PIPE or FIFO", ESPIPE, setup1}, {
2, K1, -1, "specified offset is -ve or invalid", EINVAL, setup2}, {
0, 0, 0, NULL, 0, no_setup}
};
int main(int ac, char **av)
{
int lc;
int i;
int fildes; /* file descriptor of test file */
size_t nbytes; /* no. of bytes to be written */
off_t offset; /* offset position in the specified file */
char *test_desc; /* test specific error message */
tst_parse_opts(ac, av, NULL, NULL);
setup();
for (lc = 0; TEST_LOOPING(lc); lc++) {
tst_count = 0;
/* loop through the test cases */
for (i = 0; Test_cases[i].desc != NULL; i++) {
fildes = Test_cases[i].fd;
test_desc = Test_cases[i].desc;
nbytes = Test_cases[i].nb;
offset = Test_cases[i].offst;
if (fildes == 1) {
fildes = pfd[0];
} else if (fildes == 2) {
fildes = fd1;
}
/*
* Call pread() with the specified file descriptor,
* no. of bytes to be read from specified offset.
* and verify that call should fail with appropriate
* errno set.
*/
TEST(pread(fildes, read_buf[0], nbytes, offset));
/* Check for the return code of pread() */
if (TEST_RETURN != -1) {
tst_brkm(TFAIL, cleanup, "pread() returned "
"%ld, expected -1, errno:%d",
TEST_RETURN, Test_cases[i].exp_errno);
}
/*
* Verify whether expected errno is set.
*/
if (TEST_ERRNO == Test_cases[i].exp_errno) {
tst_resm(TPASS, "pread() fails, %s, errno:%d",
test_desc, TEST_ERRNO);
} else {
tst_resm(TFAIL, "pread() fails, %s, unexpected "
"errno:%d, expected:%d", test_desc,
TEST_ERRNO, Test_cases[i].exp_errno);
}
}
}
cleanup();
tst_exit();
}
/*
* setup() - performs all ONE TIME setup for this test.
* Initialize/allocate write buffer.
* Call individual setup function.
*/
void setup(void)
{
int i;
tst_sig(FORK, DEF_HANDLER, cleanup);
TEST_PAUSE;
/* Allocate/Initialize the read/write buffer with known data */
init_buffers();
/* Call individual setup functions */
for (i = 0; Test_cases[i].desc != NULL; i++) {
Test_cases[i].setupfunc();
}
}
/*
* no_setup() - This function simply returns.
*/
int no_setup(void)
{
return 0;
}
/*
* setup1() - setup function for a test condition for which pread()
* returns -ve value and sets errno to ESPIPE.
*
* Create an unnamed pipe using pipe().
* Write some known data to the write end of the pipe.
* return 0.
*/
int setup1(void)
{
/* Create a pair of unnamed pipe */
SAFE_PIPE(cleanup, pfd);
/* Write known data (0's) of K1 bytes */
if (write(pfd[1], write_buf[0], K1) != K1) {
tst_brkm(TBROK, cleanup, "write to pipe failed: errno=%d : %s",
errno, strerror(errno));
}
return 0;
}
/*
* setup2 - setup function for a test condition for which pread()
* returns -ve value and sets errno to EINVAL.
*
* Create a temporary directory and a file under it.
* return 0.
*/
int setup2(void)
{
tst_tmpdir();
/* Creat a temporary file used for mapping */
if ((fd1 = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0) {
tst_brkm(TBROK, cleanup, "open() on %s Failed, errno=%d : %s",
TEMPFILE, errno, strerror(errno));
}
return 0;
}
/*
* init_buffers() - allocate/Initialize write_buf array.
*
* Allocate read/write buffer.
* Fill the write buffer with the following data like,
* write_buf[0] has 0's, write_buf[1] has 1's, write_buf[2] has 2's
* write_buf[3] has 3's.
*/
void init_buffers(void)
{
int count; /* counter variable for loop */
/* Allocate and Initialize write buffer with known data */
for (count = 0; count < NBUFS; count++) {
write_buf[count] = malloc(K1);
read_buf[count] = malloc(K1);
if ((write_buf[count] == NULL) || (read_buf[count] == NULL)) {
tst_brkm(TBROK, NULL,
"malloc() failed on read/write buffers");
}
memset(write_buf[count], count, K1);
}
}
/*
* cleanup() - performs all ONE TIME cleanup for this test at
* completion or premature exit.
*
* Deallocate the memory allocated to read/write buffers.
* Close the temporary file.
* Remove the temporary directory created.
*/
void cleanup(void)
{
int count;
/* Free the memory allocated for the read/write buffer */
for (count = 0; count < NBUFS; count++) {
free(write_buf[count]);
free(read_buf[count]);
}
/* Close the temporary file created in setup2 */
SAFE_CLOSE(NULL, fd1);
tst_rmdir();
}