134 lines
3.1 KiB
C
134 lines
3.1 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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* DESCRIPTION
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* Testcase to check that open(2) sets EMFILE if a process opens files
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* more than its descriptor size
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*
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* ALGORITHM
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* First get the file descriptor table size which is set for a process.
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* Use open(2) for creating files till the descriptor table becomes full.
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* These open(2)s should succeed. Finally use open(2) to open another
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* file. This attempt should fail with EMFILE.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include "test.h"
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char *TCID = "open04";
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int TST_TOTAL = 1;
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static int fd, ifile, mypid, first;
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static int nfile;
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static int *buf;
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static char fname[40];
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static void setup(void);
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static void cleanup(void);
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int main(int ac, char **av)
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{
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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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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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TEST(open(fname, O_RDWR | O_CREAT, 0777));
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if (TEST_RETURN != -1) {
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tst_resm(TFAIL, "call succeeded unexpectedly");
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continue;
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}
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if (TEST_ERRNO != EMFILE)
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tst_resm(TFAIL, "Expected EMFILE, got %d", TEST_ERRNO);
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else
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tst_resm(TPASS, "call returned expected EMFILE error");
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}
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close(first);
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close(fd);
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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(NOFORK, DEF_HANDLER, cleanup);
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TEST_PAUSE;
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/* make a temporary directory and cd to it */
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tst_tmpdir();
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mypid = getpid();
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nfile = getdtablesize();
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sprintf(fname, "open04.%d", mypid);
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first = fd = open(fname, O_RDWR | O_CREAT, 0777);
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if (first == -1)
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tst_brkm(TBROK, cleanup, "Cannot open first file");
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close(fd);
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close(first);
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unlink(fname);
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/* Allocate memory for stat and ustat structure variables */
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buf = malloc(sizeof(int) * nfile - first);
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if (buf == NULL)
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tst_brkm(TBROK, NULL, "Failed to allocate Memory");
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for (ifile = first; ifile <= nfile; ifile++) {
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sprintf(fname, "open04.%d.%d", ifile, mypid);
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fd = open(fname, O_RDWR | O_CREAT, 0777);
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if (fd == -1) {
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if (errno != EMFILE) {
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tst_brkm(TBROK, cleanup, "Expected EMFILE got "
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"%d", errno);
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}
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break;
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}
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buf[ifile - first] = fd;
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}
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}
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static void cleanup(void)
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{
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close(first);
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for (ifile = first; ifile < nfile; ifile++) {
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sprintf(fname, "open04.%d.%d", ifile, mypid);
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close(buf[ifile - first]);
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unlink(fname);
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}
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free(buf);
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/* delete the test directory created in setup() */
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tst_rmdir();
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}
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