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/*
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* NAME
* fork01.c
*
* DESCRIPTION
* Check that child has access to a full set of files.
*
* ALGORITHM
* Parent opens a maximum number of files
* Child closes one and attempts to open another, it should be
* available
*
* USAGE
* fork01
*
* HISTORY
* 07/2001 Ported by Wayne Boyer
*
* RESTRICTIONS
* None
*/
#include <errno.h>
#include <limits.h> /* for OPEN_MAX */
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include "test.h"
#include "usctest.h"
const char *TCID = "fork01";
int TST_TOTAL = 1;
extern int Tst_count;
void setup(void);
void cleanup(void) __attribute__((noreturn));
char filname[40], childfile[40];
int first;
FILE **fildeses; /* file streams */
int mypid, nfiles;
int
main(int ac, char **av)
{
int pid, status, nf;
int lc; /* loop counter */
const char *msg; /* message returned from parse_opts */
/*
* parse standard options
*/
if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
/*NOTREACHED*/
}
/*
* perform global setup for the test
*/
setup();
fildeses = (FILE**)malloc((OPEN_MAX + 10) * sizeof(FILE *));
if (fildeses == NULL) {
tst_brkm(TBROK, cleanup, "malloc failed");
/*NOTREACHED*/
}
/*
* check looping state if -i option is given
*/
for (lc = 0; TEST_LOOPING(lc); lc++) {
/*
* reset Tst_count in case we are looping.
*/
Tst_count = 0;
mypid = getpid();
tst_resm(TINFO, "OPEN_MAX is %d", OPEN_MAX);
/* establish first free file */
sprintf(filname, "fork01.%d", mypid);
if ((first = creat(filname, 0660)) == -1) {
tst_brkm(TBROK, cleanup, "Cannot open first file %s, "
"errno = %d", filname, errno);
/*NOTREACHED*/
}
close(first);
tst_resm(TINFO, "first file descriptor is %d ", first);
if (unlink(filname) == -1) {
tst_brkm(TBROK, cleanup, "Cannot unlink file %s, "
"errno = %d", filname, errno);
/*NOTREACHED*/
}
/*
* now open all the files for the test
*/
for (nfiles = first; nfiles < OPEN_MAX; nfiles++) {
sprintf(filname, "file%d.%d", nfiles, mypid);
if ((fildeses[nfiles] = fopen(filname, "a")) == NULL) {
tst_brkm(TBROK, cleanup, "Parent: cannot open "
"file %d %s errno = %d", nfiles,
filname, errno);
/*NOTREACHED*/
}
#ifdef DEBUG
tst_resm(TINFO, "filname: %s", filname);
#endif
}
tst_resm(TINFO, "Parent reporting %d files open", nfiles - 1);
if ((pid = fork()) == -1) {
tst_brkm(TBROK, cleanup, "Fork failed");
/*NOTREACHED*/
}
if (pid == 0) { /* child */
nfiles--;
if (fclose(fildeses[nfiles]) == -1) {
tst_resm(TINFO, "Child could not close file "
"#%d, errno = %d", nfiles, errno);
exit(1);
/*NOTREACHED*/
} else {
sprintf(childfile, "cfile.%d", getpid());
if ((fildeses[nfiles] =
fopen(childfile, "a")) == NULL) {
tst_resm(TINFO, "Child could not open "
"file %s, errno = %d",
childfile, errno);
exit(1);
/*NOTREACHED*/
} else {
tst_resm(TINFO, "Child opened new "
"file #%d", nfiles);
unlink(childfile);
exit(0);
}
}
} else { /* parent */
wait(&status);
if (status >> 8 != 0) {
tst_resm(TFAIL, "test 1 FAILED");
} else {
tst_resm(TPASS, "test 1 PASSED");
}
}
/* clean up things in case we are looping */
for (nf = first; nf < nfiles; nf++) {
fclose(fildeses[nf]);
sprintf(filname, "file%d.%d", nf, mypid);
unlink(filname);
}
}
cleanup();
/*NOTREACHED*/
}
/*
* setup() - performs all ONE TIME setup for this test
*/
void
setup()
{
/*
* capture signals
*/
tst_sig(FORK, DEF_HANDLER, cleanup);
umask(0);
/*
* Pause if that option was specified
*/
TEST_PAUSE;
/*
* make a temp directory and cd to it
*/
tst_tmpdir();
}
/*
* cleanup() - performs all ONE TIME cleanup for this test at
* completion or at premature exit
*/
void
cleanup()
{
/*
* print timing stats if that option was specified.
* print errno log if that option was specified.
*/
TEST_CLEANUP;
/*
* remove tmp dir and all files in it
*/
tst_rmdir();
tst_exit();
}
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