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