/*
*
* 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: pread01
*
* Test Description:
* Verify the functionality of pread() by writing known data using pwrite()
* to the file at various specified offsets and later read from the file from
* various specified offsets, comparing the data read aganist the data
* written.
*
* Expected Result:
* pread() should succeed to read the expected no. of bytes of data and
* the data read should match aganist the data written to the file.
*
* Algorithm:
* Setup:
* Setup signal handling.
* Create 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)
* Issue a FAIL message.
* Otherwise,
* Verify the Functionality of system call
* if successful,
* Issue Functionality-Pass message.
* Otherwise,
* Issue Functionality-Fail message.
* Cleanup:
* Print errno log and/or timing stats if options given
* Delete the temporary directory created.
*
* Usage: <for command-line>
* pread01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
* where, -c n : Run n copies concurrently.
* -f : Turn off functionality Testing.
* -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 <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <inttypes.h>
#include "test.h"
#include "safe_macros.h"
#define TEMPFILE "pread_file"
#define K1 1024
#define K2 (K1 * 2)
#define K3 (K1 * 3)
#define K4 (K1 * 4)
#define NBUFS 4
char *TCID = "pread01";
int TST_TOTAL = 1;
int fildes; /* file descriptor for tempfile */
char *write_buf[NBUFS]; /* buffer to hold data to be written */
char *read_buf[NBUFS]; /* buffer to hold data read from file */
void setup(); /* Main setup function of test */
void cleanup(); /* cleanup function for the test */
void l_seek(int, off_t, int, off_t); /* function to call lseek() */
void init_buffers(); /* function to initialize/allocate buffers */
void compare_bufers(); /* function to compare o/p of pread/pwrite */
int main(int ac, char **av)
{
int lc;
int nread; /* no. of bytes read by pread() */
tst_parse_opts(ac, av, NULL, NULL);
setup();
for (lc = 0; TEST_LOOPING(lc); lc++) {
/* Reset tst_count in case we are looping */
tst_count = 0;
/*
* Call pread() of K1 data (should be 2's) at offset K2.
*/
nread = pread(fildes, read_buf[2], K1, K2);
/* Check for the return value of pread() */
if (nread != K1) {
tst_brkm(TFAIL, cleanup, "pread() at off. K2 failed: "
"nread=%d, error:%d", nread, errno);
}
/*
* We should still be at offset K4,
* which we were at the end of block 0.
*/
l_seek(fildes, 0, SEEK_CUR, K4);
/* Now lseek() to offset 0. */
l_seek(fildes, 0, SEEK_SET, 0);
/* pread() K1 of data (should be 3's) at offset K3. */
nread = pread(fildes, read_buf[3], K1, K3);
if (nread != K1) {
tst_brkm(TFAIL, cleanup, "pread() at off. K3 failed: "
"nread=%d, error:%d", nread, errno);
}
/* We should still be at offset 0. */
l_seek(fildes, 0, SEEK_CUR, 0);
/*
* Do a normal read() of K1 data (should be 0's)
* which should take place at offset 0 and move the
* file pointer to an offset of K1.
*/
if ((nread = read(fildes, read_buf[0], K1)) != K1) {
tst_brkm(TFAIL, cleanup, "read() at off. 0 failed: "
"nread=%d, errno=%d", nread, errno);
}
/* We should now be at an offset of K1. */
l_seek(fildes, 0, SEEK_CUR, K1);
/* pread() of K1 data (should be 1's) at offset K1. */
nread = pread(fildes, read_buf[1], K1, K1);
if (nread != K1) {
tst_brkm(TFAIL, cleanup, "pread() at off. K1 failed: "
"nread=%d, error:%d", nread, errno);
}
/* We should still be at offset K1. */
l_seek(fildes, 0, SEEK_CUR, K1);
/*
* Compare the read buffer data read
* with the data written to write buffer
* in the setup.
*/
compare_bufers();
/* reset our location to offset K4 in case we are looping */
l_seek(fildes, K4, SEEK_SET, K4);
}
cleanup();
tst_exit();
}
/*
* setup() - performs all ONE TIME setup for this test.
*
* Initialize/allocate read/write buffers.
* Create a temporary directory and a file under it and
* write know data at different offset positions.
*/
void setup(void)
{
int nwrite = 0; /* no. of bytes written by pwrite() */
tst_sig(FORK, DEF_HANDLER, cleanup);
TEST_PAUSE;
/* Allocate/Initialize the read/write buffer with know data */
init_buffers();
tst_tmpdir();
/* Creat a temporary file used for mapping */
if ((fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0) {
tst_brkm(TBROK, cleanup, "open() on %s failed, errno=%d : %s",
TEMPFILE, errno, strerror(errno));
}
/* pwrite() K1 of data (0's) at offset 0 of temporary file */
if ((nwrite = pwrite(fildes, write_buf[0], K1, 0)) != K1) {
tst_brkm(TBROK, cleanup, "pwrite() failed to write on %s, "
"errno=%d : %s", TEMPFILE, errno, strerror(errno));
}
/* We should still be at offset 0. */
l_seek(fildes, 0, SEEK_CUR, 0);
/* Now, lseek() to a non K boundary, just to be different. */
l_seek(fildes, K1 / 2, SEEK_SET, K1 / 2);
/* Again, pwrite() K1 of data (2's) at offset K2 of temporary file */
if ((nwrite = pwrite(fildes, write_buf[2], K1, K2)) != K1) {
tst_brkm(TBROK, cleanup, "pwrite() failed to write at %d off. "
"on %s, errno=%d : %s", K2, TEMPFILE, errno,
strerror(errno));
}
/* We should still be at our non K boundary. */
l_seek(fildes, 0, SEEK_CUR, K1 / 2);
/* lseek() to an offset of K3. */
l_seek(fildes, K3, SEEK_SET, K3);
/*
* Using write(), write of K1 of data (3's) which should take
* place at an offset of K3, moving the file pointer to K4.
*/
if ((nwrite = write(fildes, write_buf[3], K1)) != K1) {
tst_brkm(TBROK, cleanup, "write() failed: nwrite=%d, errno=%d "
": %s", nwrite, errno, strerror(errno));
}
/* We should be at offset K4. */
l_seek(fildes, 0, SEEK_CUR, K4);
/* Again, pwrite() K1 of data (1's) at offset K1. */
if ((nwrite = pwrite(fildes, write_buf[1], K1, K1)) != K1) {
tst_brkm(TBROK, cleanup, "pwrite() failed to write at %d off. "
"on %s, errno=%d : %s", K1, TEMPFILE, errno,
strerror(errno));
}
}
/*
* init_buffers - allocates both write_buf and read_buf arrays.
*
* Allocate the read and write buffers.
* 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 read/write buffer */
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);
}
}
/*
* l_seek() - local front end to lseek().
*
* "checkoff" is the offset at which we believe we should be at.
* Used to validate pread/pwrite don't move the offset.
*/
void l_seek(int fdesc, off_t offset, int whence, off_t checkoff)
{
off_t offloc; /* offset ret. from lseek() */
if ((offloc = lseek(fdesc, offset, whence)) != checkoff) {
tst_resm(TWARN, "return = %" PRId64 ", expected %" PRId64,
(int64_t) offloc, (int64_t) checkoff);
tst_brkm(TBROK | TERRNO, cleanup, "lseek() on %s failed",
TEMPFILE);
}
}
/*
* compare_bufers() - Compare the contents of read buffer aganist the
* write buffer contents.
*
* The contents of the index of each buffer should be as follows:
* [0] has 0's, [1] has 1's, [2] has 2's, and [3] has 3's.
*
* This function does memcmp of read/write buffer and display message
* about the functionality of pread().
*/
void compare_bufers(void)
{
int count; /* index for the loop */
int err_flg = 0; /* flag to indicate error */
for (count = 0; count < NBUFS; count++) {
if (memcmp(write_buf[count], read_buf[count], K1) != 0) {
tst_resm(TFAIL, "read/write buffer data mismatch");
err_flg++;
}
}
/* If no erros, Test successful */
if (!err_flg) {
tst_resm(TPASS, "Functionality of pread() is correct");
}
}
/*
* 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 */
SAFE_CLOSE(NULL, fildes);
tst_rmdir();
}