| /* |
| * Copyright (c) International Business Machines Corp., 2002 |
| * ported from SPIE, section2/iosuite/dup1.c, by Airong Zhang |
| * Copyright (c) 2013 Cyril Hrubis <chrubis@suse.cz> |
| * |
| * 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 |
| */ |
| |
| /* |
| WHAT: Does dup return -1 on the 21st file? |
| HOW: Create up to _NFILE (20) files and check for -1 return on the |
| next attempt |
| Should check NOFILE as well as _NFILE. 19-Jun-84 Dale. |
| */ |
| |
| #include <stdio.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/param.h> |
| #include "test.h" |
| |
| char *TCID = "dup06"; |
| int TST_TOTAL = 1; |
| |
| static int cnt_free_fds(int maxfd) |
| { |
| int freefds = 0; |
| |
| for (maxfd--; maxfd >= 0; maxfd--) |
| if (fcntl(maxfd, F_GETFD) == -1 && errno == EBADF) |
| freefds++; |
| |
| return (freefds); |
| } |
| |
| static void setup(void); |
| static void cleanup(void); |
| |
| int main(int ac, char **av) |
| { |
| int *fildes, i; |
| int min; |
| int freefds; |
| int lc; |
| const char *msg; |
| const char *pfilname = "dup06"; |
| |
| if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| |
| min = getdtablesize(); |
| freefds = cnt_free_fds(min); |
| fildes = malloc((min + 5) * sizeof(int)); |
| |
| for (i = 0; i < min + 5; i++) |
| fildes[i] = 0; |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| unlink(pfilname); |
| |
| if ((fildes[0] = creat(pfilname, 0666)) == -1) { |
| tst_resm(TFAIL, "Cannot open first file"); |
| } else { |
| for (i = 1; i < min + 5; i++) { |
| if ((fildes[i] = dup(fildes[i - 1])) == -1) |
| break; |
| } |
| if (i < freefds) { |
| tst_resm(TFAIL, "Not enough files duped"); |
| } else if (i > freefds) { |
| tst_resm(TFAIL, "Too many files duped"); |
| } else { |
| tst_resm(TPASS, "Test passed."); |
| } |
| } |
| |
| unlink(pfilname); |
| |
| for (i = 0; i < min + 5; i++) { |
| if (fildes[i] != 0 && fildes[i] != -1) |
| close(fildes[i]); |
| |
| fildes[i] = 0; |
| } |
| } |
| |
| cleanup(); |
| tst_exit(); |
| } |
| |
| static void setup(void) |
| { |
| tst_tmpdir(); |
| } |
| |
| static void cleanup(void) |
| { |
| tst_rmdir(); |
| } |