173 lines
3.9 KiB
C
173 lines
3.9 KiB
C
/*
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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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* NAME
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* fork09.c
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*
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* DESCRIPTION
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* Check that child has access to a full set of files.
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*
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* ALGORITHM
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* Parent opens a maximum number of files
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* Child closes one and attempts to open another, it should be
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* available
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*
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* USAGE
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* fork09
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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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* 10/2008 Suzuki K P <suzuki@in.ibm.com>
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* Fix maximum number of files open logic.
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*
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* RESTRICTIONS
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* None
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h> /* for _SC_OPEN_MAX */
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#include "test.h"
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#include "safe_macros.h"
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char *TCID = "fork09";
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int TST_TOTAL = 1;
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static void setup(void);
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static void cleanup(void);
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static char filname[40], childfile[40];
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static int first;
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static FILE **fildeses; /* file streams */
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static int mypid, nfiles;
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#define OPEN_MAX (sysconf(_SC_OPEN_MAX))
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int main(int ac, char **av)
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{
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int pid, status, nf;
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int lc;
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tst_parse_opts(ac, av, NULL, NULL);
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setup();
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fildeses = malloc((OPEN_MAX + 10) * sizeof(FILE *));
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if (fildeses == NULL)
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tst_brkm(TBROK, cleanup, "malloc failed");
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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mypid = getpid();
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tst_resm(TINFO, "OPEN_MAX is %ld", OPEN_MAX);
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/* establish first free file */
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sprintf(filname, "fork09.%d", mypid);
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first = SAFE_CREAT(cleanup, filname, 0660);
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close(first);
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tst_resm(TINFO, "first file descriptor is %d ", first);
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SAFE_UNLINK(cleanup, filname);
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/*
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* now open all the files for the test
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*/
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for (nfiles = first; nfiles < OPEN_MAX; nfiles++) {
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sprintf(filname, "file%d.%d", nfiles, mypid);
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fildeses[nfiles] = fopen(filname, "a");
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if (fildeses[nfiles] == NULL) {
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/* Did we already reach OPEN_MAX ? */
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if (errno == EMFILE)
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break;
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tst_brkm(TBROK, cleanup, "Parent: cannot open "
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"file %d %s errno = %d", nfiles,
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filname, errno);
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}
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#ifdef DEBUG
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tst_resm(TINFO, "filname: %s", filname);
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#endif
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}
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tst_resm(TINFO, "Parent reporting %d files open", nfiles - 1);
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pid = fork();
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if (pid == -1)
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tst_brkm(TBROK, cleanup, "Fork failed");
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if (pid == 0) { /* child */
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nfiles--;
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if (fclose(fildeses[nfiles]) == -1) {
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tst_resm(TINFO, "Child could not close file "
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"#%d, errno = %d", nfiles, errno);
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exit(1);
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} else {
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sprintf(childfile, "cfile.%d", getpid());
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fildeses[nfiles] = fopen(childfile, "a");
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if (fildeses[nfiles] == NULL) {
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tst_resm(TINFO, "Child could not open "
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"file %s, errno = %d",
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childfile, errno);
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exit(1);
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} else {
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tst_resm(TINFO, "Child opened new "
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"file #%d", nfiles);
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unlink(childfile);
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exit(0);
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}
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}
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} else { /* parent */
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wait(&status);
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if (status >> 8 != 0)
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tst_resm(TFAIL, "test 1 FAILED");
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else
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tst_resm(TPASS, "test 1 PASSED");
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}
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/* clean up things in case we are looping */
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for (nf = first; nf < nfiles; nf++) {
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fclose(fildeses[nf]);
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sprintf(filname, "file%d.%d", nf, mypid);
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unlink(filname);
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}
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}
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cleanup();
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tst_exit();
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}
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static void setup(void)
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{
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tst_sig(FORK, DEF_HANDLER, cleanup);
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umask(0);
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TEST_PAUSE;
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tst_tmpdir();
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}
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static void cleanup(void)
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{
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tst_rmdir();
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}
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