349 lines
9.7 KiB
C
349 lines
9.7 KiB
C
/*
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*
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* Copyright (c) International Business Machines Corp., 2001
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* Test Name: pread01
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*
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* Test Description:
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* Verify the functionality of pread() by writing known data using pwrite()
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* to the file at various specified offsets and later read from the file from
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* various specified offsets, comparing the data read aganist the data
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* written.
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*
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* Expected Result:
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* pread() should succeed to read the expected no. of bytes of data and
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* the data read should match aganist the data written to the file.
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*
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* Algorithm:
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* Setup:
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* Setup signal handling.
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* Create temporary directory.
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* Pause for SIGUSR1 if option specified.
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*
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* Test:
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* Loop if the proper options are given.
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* Execute system call
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* Check return code, if system call failed (return=-1)
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* Issue a FAIL message.
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* Otherwise,
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* Verify the Functionality of system call
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* if successful,
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* Issue Functionality-Pass message.
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* Otherwise,
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* Issue Functionality-Fail message.
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* Cleanup:
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* Print errno log and/or timing stats if options given
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* Delete the temporary directory created.
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*
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* Usage: <for command-line>
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* pread01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
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* where, -c n : Run n copies concurrently.
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* -f : Turn off functionality Testing.
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* -i n : Execute test n times.
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* -I x : Execute test for x seconds.
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* -P x : Pause for x seconds between iterations.
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* -t : Turn on syscall timing.
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*
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* HISTORY
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* 07/2001 Ported by Wayne Boyer
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*
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* RESTRICTIONS:
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* None.
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*/
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#define _XOPEN_SOURCE 500
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#include <stdlib.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include "test.h"
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#include "safe_macros.h"
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#define TEMPFILE "pread_file"
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#define K1 1024
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#define K2 (K1 * 2)
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#define K3 (K1 * 3)
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#define K4 (K1 * 4)
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#define NBUFS 4
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char *TCID = "pread01";
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int TST_TOTAL = 1;
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int fildes; /* file descriptor for tempfile */
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char *write_buf[NBUFS]; /* buffer to hold data to be written */
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char *read_buf[NBUFS]; /* buffer to hold data read from file */
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void setup(); /* Main setup function of test */
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void cleanup(); /* cleanup function for the test */
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void l_seek(int, off_t, int, off_t); /* function to call lseek() */
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void init_buffers(); /* function to initialize/allocate buffers */
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void compare_bufers(); /* function to compare o/p of pread/pwrite */
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int main(int ac, char **av)
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{
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int lc;
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int nread; /* no. of bytes read by pread() */
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tst_parse_opts(ac, av, NULL, NULL);
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setup();
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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/* Reset tst_count in case we are looping */
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tst_count = 0;
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/*
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* Call pread() of K1 data (should be 2's) at offset K2.
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*/
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nread = pread(fildes, read_buf[2], K1, K2);
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/* Check for the return value of pread() */
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if (nread != K1) {
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tst_brkm(TFAIL, cleanup, "pread() at off. K2 failed: "
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"nread=%d, error:%d", nread, errno);
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}
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/*
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* We should still be at offset K4,
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* which we were at the end of block 0.
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*/
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l_seek(fildes, 0, SEEK_CUR, K4);
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/* Now lseek() to offset 0. */
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l_seek(fildes, 0, SEEK_SET, 0);
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/* pread() K1 of data (should be 3's) at offset K3. */
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nread = pread(fildes, read_buf[3], K1, K3);
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if (nread != K1) {
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tst_brkm(TFAIL, cleanup, "pread() at off. K3 failed: "
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"nread=%d, error:%d", nread, errno);
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}
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/* We should still be at offset 0. */
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l_seek(fildes, 0, SEEK_CUR, 0);
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/*
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* Do a normal read() of K1 data (should be 0's)
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* which should take place at offset 0 and move the
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* file pointer to an offset of K1.
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*/
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if ((nread = read(fildes, read_buf[0], K1)) != K1) {
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tst_brkm(TFAIL, cleanup, "read() at off. 0 failed: "
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"nread=%d, errno=%d", nread, errno);
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}
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/* We should now be at an offset of K1. */
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l_seek(fildes, 0, SEEK_CUR, K1);
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/* pread() of K1 data (should be 1's) at offset K1. */
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nread = pread(fildes, read_buf[1], K1, K1);
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if (nread != K1) {
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tst_brkm(TFAIL, cleanup, "pread() at off. K1 failed: "
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"nread=%d, error:%d", nread, errno);
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}
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/* We should still be at offset K1. */
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l_seek(fildes, 0, SEEK_CUR, K1);
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/*
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* Compare the read buffer data read
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* with the data written to write buffer
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* in the setup.
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*/
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compare_bufers();
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/* reset our location to offset K4 in case we are looping */
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l_seek(fildes, K4, SEEK_SET, K4);
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}
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cleanup();
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tst_exit();
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}
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/*
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* setup() - performs all ONE TIME setup for this test.
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*
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* Initialize/allocate read/write buffers.
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* Create a temporary directory and a file under it and
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* write know data at different offset positions.
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*/
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void setup(void)
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{
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int nwrite = 0; /* no. of bytes written by pwrite() */
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tst_sig(FORK, DEF_HANDLER, cleanup);
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TEST_PAUSE;
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/* Allocate/Initialize the read/write buffer with know data */
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init_buffers();
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tst_tmpdir();
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/* Creat a temporary file used for mapping */
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if ((fildes = open(TEMPFILE, O_RDWR | O_CREAT, 0666)) < 0) {
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tst_brkm(TBROK, cleanup, "open() on %s failed, errno=%d : %s",
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TEMPFILE, errno, strerror(errno));
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}
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/* pwrite() K1 of data (0's) at offset 0 of temporary file */
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if ((nwrite = pwrite(fildes, write_buf[0], K1, 0)) != K1) {
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tst_brkm(TBROK, cleanup, "pwrite() failed to write on %s, "
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"errno=%d : %s", TEMPFILE, errno, strerror(errno));
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}
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/* We should still be at offset 0. */
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l_seek(fildes, 0, SEEK_CUR, 0);
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/* Now, lseek() to a non K boundary, just to be different. */
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l_seek(fildes, K1 / 2, SEEK_SET, K1 / 2);
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/* Again, pwrite() K1 of data (2's) at offset K2 of temporary file */
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if ((nwrite = pwrite(fildes, write_buf[2], K1, K2)) != K1) {
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tst_brkm(TBROK, cleanup, "pwrite() failed to write at %d off. "
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"on %s, errno=%d : %s", K2, TEMPFILE, errno,
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strerror(errno));
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}
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/* We should still be at our non K boundary. */
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l_seek(fildes, 0, SEEK_CUR, K1 / 2);
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/* lseek() to an offset of K3. */
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l_seek(fildes, K3, SEEK_SET, K3);
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/*
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* Using write(), write of K1 of data (3's) which should take
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* place at an offset of K3, moving the file pointer to K4.
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*/
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if ((nwrite = write(fildes, write_buf[3], K1)) != K1) {
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tst_brkm(TBROK, cleanup, "write() failed: nwrite=%d, errno=%d "
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": %s", nwrite, errno, strerror(errno));
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}
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/* We should be at offset K4. */
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l_seek(fildes, 0, SEEK_CUR, K4);
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/* Again, pwrite() K1 of data (1's) at offset K1. */
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if ((nwrite = pwrite(fildes, write_buf[1], K1, K1)) != K1) {
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tst_brkm(TBROK, cleanup, "pwrite() failed to write at %d off. "
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"on %s, errno=%d : %s", K1, TEMPFILE, errno,
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strerror(errno));
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}
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}
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/*
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* init_buffers - allocates both write_buf and read_buf arrays.
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*
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* Allocate the read and write buffers.
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* Fill the write buffer with the following data like,
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* write_buf[0] has 0's, write_buf[1] has 1's, write_buf[2] has 2's
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* write_buf[3] has 3's.
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*/
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void init_buffers(void)
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{
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int count; /* counter variable for loop */
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/* Allocate and Initialize read/write buffer */
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for (count = 0; count < NBUFS; count++) {
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write_buf[count] = malloc(K1);
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read_buf[count] = malloc(K1);
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if ((write_buf[count] == NULL) || (read_buf[count] == NULL)) {
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tst_brkm(TBROK, NULL,
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"malloc() failed on read/write buffers");
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}
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memset(write_buf[count], count, K1);
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}
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}
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/*
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* l_seek() - local front end to lseek().
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*
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* "checkoff" is the offset at which we believe we should be at.
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* Used to validate pread/pwrite don't move the offset.
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*/
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void l_seek(int fdesc, off_t offset, int whence, off_t checkoff)
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{
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off_t offloc; /* offset ret. from lseek() */
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if ((offloc = lseek(fdesc, offset, whence)) != checkoff) {
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tst_resm(TWARN, "return = %" PRId64 ", expected %" PRId64,
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(int64_t) offloc, (int64_t) checkoff);
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tst_brkm(TBROK | TERRNO, cleanup, "lseek() on %s failed",
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TEMPFILE);
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}
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}
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/*
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* compare_bufers() - Compare the contents of read buffer aganist the
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* write buffer contents.
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*
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* The contents of the index of each buffer should be as follows:
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* [0] has 0's, [1] has 1's, [2] has 2's, and [3] has 3's.
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*
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* This function does memcmp of read/write buffer and display message
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* about the functionality of pread().
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*/
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void compare_bufers(void)
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{
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int count; /* index for the loop */
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int err_flg = 0; /* flag to indicate error */
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for (count = 0; count < NBUFS; count++) {
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if (memcmp(write_buf[count], read_buf[count], K1) != 0) {
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tst_resm(TFAIL, "read/write buffer data mismatch");
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err_flg++;
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}
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}
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/* If no erros, Test successful */
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if (!err_flg) {
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tst_resm(TPASS, "Functionality of pread() is correct");
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}
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}
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/*
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* cleanup() - performs all ONE TIME cleanup for this test at
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* completion or premature exit.
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*
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* Deallocate the memory allocated to read/write buffers.
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* Close the temporary file.
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* Remove the temporary directory created.
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*/
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void cleanup(void)
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{
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int count;
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/* Free the memory allocated for the read/write buffer */
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for (count = 0; count < NBUFS; count++) {
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free(write_buf[count]);
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free(read_buf[count]);
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}
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/* Close the temporary file */
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SAFE_CLOSE(NULL, fildes);
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tst_rmdir();
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}
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