| /* |
| * Copyright (c) International Business Machines Corp., 2002 |
| * Ported by Paul Larson |
| * 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 |
| */ |
| |
| /* |
| * Test the ability of pipe to open the maximum even number of file |
| * descriptors permitted (or (maxfds - 3)/2 pipes) |
| * |
| * ALGORITHM |
| * 1. record file descriptors open prior to test run |
| * 2. open pipes until EMFILE is returned |
| * 3. check to see that the number of pipes opened is (maxfds - 3) / 2 |
| * 4. close all fds in range 0, maximal fd that were not open prior to |
| * the test execution |
| */ |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <dirent.h> |
| |
| #include "test.h" |
| #include "safe_macros.h" |
| |
| char *TCID = "pipe07"; |
| int TST_TOTAL = 1; |
| |
| /* used to record file descriptors open at the test start */ |
| static int rec_fds[128]; |
| static int rec_fds_max; |
| static void record_open_fds(void); |
| static void close_test_fds(int max_fd); |
| |
| static void setup(void); |
| static void cleanup(void); |
| |
| int main(int ac, char **av) |
| { |
| int lc; |
| const char *msg; |
| int min, ret; |
| int npipes; |
| int pipes[2], max_fd = 0; |
| |
| if ((msg = parse_opts(ac, av, NULL, NULL)) != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| |
| min = getdtablesize() - rec_fds_max; |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) { |
| tst_count = 0; |
| |
| for (npipes = 0;; npipes++) { |
| ret = pipe(pipes); |
| if (ret < 0) { |
| if (errno != EMFILE) { |
| tst_brkm(TFAIL, cleanup, |
| "got unexpected error - %d", |
| errno); |
| } |
| break; |
| } |
| |
| max_fd = MAX(pipes[0], max_fd); |
| max_fd = MAX(pipes[1], max_fd); |
| } |
| |
| if (npipes == (min / 2)) |
| tst_resm(TPASS, "Opened %d pipes", npipes); |
| else |
| tst_resm(TFAIL, "Unable to open maxfds/2 pipes"); |
| |
| close_test_fds(max_fd); |
| max_fd = 0; |
| } |
| |
| cleanup(); |
| tst_exit(); |
| } |
| |
| static void setup(void) |
| { |
| tst_sig(FORK, DEF_HANDLER, cleanup); |
| TEST_PAUSE; |
| |
| record_open_fds(); |
| } |
| |
| static void record_open_fds(void) |
| { |
| DIR *dir = opendir("/proc/self/fd"); |
| int dir_fd, fd; |
| struct dirent *file; |
| |
| if (dir == NULL) |
| tst_brkm(TBROK | TERRNO, cleanup, "opendir()"); |
| |
| dir_fd = dirfd(dir); |
| |
| if (dir_fd == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "dirfd()"); |
| |
| errno = 0; |
| |
| while ((file = readdir(dir))) { |
| if (!strcmp(file->d_name, ".") || !strcmp(file->d_name, "..")) |
| continue; |
| |
| fd = atoi(file->d_name); |
| |
| if (fd == dir_fd) |
| continue; |
| |
| if (rec_fds_max >= ARRAY_SIZE(rec_fds)) { |
| tst_brkm(TBROK, cleanup, |
| "Too much file descriptors open"); |
| } |
| |
| rec_fds[rec_fds_max++] = fd; |
| } |
| |
| if (errno) |
| tst_brkm(TBROK | TERRNO, cleanup, "readdir()"); |
| |
| closedir(dir); |
| |
| tst_resm(TINFO, "Found %u files open", rec_fds_max); |
| } |
| |
| static int not_recorded(int fd) |
| { |
| int i; |
| |
| for (i = 0; i < rec_fds_max; i++) |
| if (fd == rec_fds[i]) |
| return 0; |
| |
| return 1; |
| } |
| |
| static void close_test_fds(int max_fd) |
| { |
| int i; |
| |
| for (i = 0; i <= max_fd; i++) { |
| if (not_recorded(i)) { |
| if (close(i)) { |
| if (errno == EBADF) |
| continue; |
| tst_resm(TWARN | TERRNO, "close(%i)", i); |
| } |
| } |
| } |
| } |
| |
| static void cleanup(void) |
| { |
| } |