| /* |
| * |
| * 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 |
| */ |
| |
| /* |
| * NAME |
| * creat05.c |
| * |
| * DESCRIPTION |
| * Testcase to check that creat(2) system call returns EMFILE. |
| * |
| * ALGORITHM |
| * A process creates a temporary test directory, then it should |
| * get the system configured NOFILE parameter (ie. the maximum no. of |
| * open files of a process). This can be done using the getdtablesize() |
| * system call. Once this is determined, the process should attempt |
| * to creat(2) the this no. of files (can be done using a "for" loop). |
| * Then, the process should attempt to creat() another file, which should |
| * fail with EMFILE. |
| * |
| * USAGE |
| * creat05 |
| * |
| * HISTORY |
| * 07/2001 Ported by Wayne Boyer |
| * |
| * RESTRICTIONS |
| * None |
| */ |
| |
| #include <stdio.h> |
| #include <errno.h> |
| #include <sys/types.h> |
| #include <sys/time.h> |
| #include <sys/resource.h> |
| #include <sys/stat.h> |
| #include <fcntl.h> |
| #include <linux/limits.h> |
| #include <unistd.h> |
| #include "test.h" |
| #include "usctest.h" |
| |
| char *TCID = "creat05"; |
| int TST_TOTAL = 1; |
| |
| #define MODE 0666 |
| |
| void remove_files(int); |
| void setup(void); |
| void cleanup(void); |
| |
| int exp_enos[] = { EMFILE, 0 }; |
| |
| int fd, ifile, mypid, first; |
| int *buf; |
| char fname[40]; |
| |
| int main(int ac, char **av) |
| { |
| int lc; |
| char *msg; |
| |
| if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) { |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| } |
| |
| setup(); |
| |
| TEST_EXP_ENOS(exp_enos); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| |
| /* reset tst_count in case we are looping */ |
| tst_count = 0; |
| |
| TEST(creat(fname, MODE)); |
| |
| if (TEST_RETURN != -1) { |
| tst_resm(TFAIL, "call succeeded unexpectedly"); |
| continue; |
| } |
| |
| TEST_ERROR_LOG(TEST_ERRNO); |
| |
| if (TEST_ERRNO == EMFILE) { |
| tst_resm(TPASS, "call failed with expected error - " |
| "EMFILE"); |
| } else { |
| tst_resm(TFAIL | TTERRNO, "Expected EMFILE"); |
| } |
| |
| remove_files(ifile); |
| } |
| cleanup(); |
| |
| tst_exit(); |
| } |
| |
| /* |
| * setup() - performs all ONE TIME setup for this test. |
| */ |
| void setup() |
| { |
| int max_open; |
| |
| tst_sig(NOFORK, DEF_HANDLER, cleanup); |
| |
| TEST_PAUSE; |
| |
| /* make a temporary directory and cd to it */ |
| tst_tmpdir(); |
| |
| umask(0); |
| mypid = getpid(); |
| sprintf(fname, "creat05.%d", mypid); |
| unlink(fname); |
| |
| /* create a file to get the first file descriptor available */ |
| if ((first = fd = creat(fname, MODE)) == -1) { |
| tst_brkm(TFAIL, cleanup, "Cannot open first file"); |
| } |
| |
| close(fd); |
| unlink(fname); |
| tst_resm(TINFO, "first file is #%d", fd); |
| |
| /* get the maximum number of files that we can open */ |
| max_open = getdtablesize(); |
| /* Allocate memory for stat and ustat structure variables */ |
| if ((buf = (int *)malloc(sizeof(int) * max_open - first)) == NULL) { |
| tst_brkm(TBROK, NULL, "Failed to allocate Memory"); |
| } |
| |
| /* now open as many files as we can up to max_open */ |
| for (ifile = first; ifile <= max_open; ifile++) { |
| sprintf(fname, "creat05.%d.%d", ifile, mypid); |
| if ((fd = creat(fname, 0666)) == -1) { |
| tst_resm(TINFO, "could not creat file " |
| "#%d", ifile + 1); |
| if (errno != EMFILE) { |
| remove_files(ifile); |
| tst_brkm(TBROK | TERRNO, cleanup, |
| "Failed unexpectedly (expected EMFILE)"); |
| } |
| break; |
| } |
| buf[ifile - first] = fd; |
| } |
| } |
| |
| /* |
| * remove_files - remove the temporary files that were created |
| */ |
| void remove_files(int nfiles) |
| { |
| int i; |
| |
| for (i = first; i < nfiles; i++) { |
| sprintf(fname, "creat05.%d.%d", i, mypid); |
| close(buf[i - first]); |
| unlink(fname); |
| } |
| } |
| |
| /* |
| * cleanup() - performs all ONE TIME cleanup for this test at |
| * completion or premature exit. |
| */ |
| void cleanup() |
| { |
| /* |
| * print timing stats if that option was specified. |
| * print errno log if that option was specified. |
| */ |
| close(first); |
| |
| TEST_CLEANUP; |
| |
| /* delete the test directory created in setup() */ |
| tst_rmdir(); |
| |
| } |