177 lines
3.6 KiB
C
177 lines
3.6 KiB
C
/*
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* Copyright (c) International Business Machines Corp., 2002
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* Ported by Paul Larson
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* Copyright (c) 2013 Cyril Hrubis <chrubis@suse.cz>
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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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* Test the ability of pipe to open the maximum even number of file
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* descriptors permitted (or (maxfds - 3)/2 pipes)
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*
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* ALGORITHM
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* 1. record file descriptors open prior to test run
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* 2. open pipes until EMFILE is returned
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* 3. check to see that the number of pipes opened is (maxfds - 3) / 2
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* 4. close all fds in range 0, maximal fd that were not open prior to
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* the test execution
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <dirent.h>
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#include "test.h"
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#include "safe_macros.h"
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char *TCID = "pipe07";
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int TST_TOTAL = 1;
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/* used to record file descriptors open at the test start */
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static int rec_fds[128];
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static int rec_fds_max;
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static void record_open_fds(void);
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static void close_test_fds(int max_fd);
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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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int min, ret;
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int npipes;
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int pipes[2], max_fd = 0;
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tst_parse_opts(ac, av, NULL, NULL);
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setup();
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min = getdtablesize() - rec_fds_max;
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for (lc = 0; TEST_LOOPING(lc); lc++) {
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tst_count = 0;
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for (npipes = 0;; npipes++) {
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ret = pipe(pipes);
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if (ret < 0) {
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if (errno != EMFILE) {
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tst_brkm(TFAIL, cleanup,
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"got unexpected error - %d",
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errno);
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}
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break;
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}
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max_fd = MAX(pipes[0], max_fd);
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max_fd = MAX(pipes[1], max_fd);
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}
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if (npipes == (min / 2))
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tst_resm(TPASS, "Opened %d pipes", npipes);
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else
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tst_resm(TFAIL, "Unable to open maxfds/2 pipes");
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close_test_fds(max_fd);
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max_fd = 0;
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}
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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(FORK, DEF_HANDLER, cleanup);
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TEST_PAUSE;
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record_open_fds();
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}
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static void record_open_fds(void)
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{
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DIR *dir = opendir("/proc/self/fd");
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int dir_fd, fd;
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struct dirent *file;
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if (dir == NULL)
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tst_brkm(TBROK | TERRNO, cleanup, "opendir()");
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dir_fd = dirfd(dir);
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if (dir_fd == -1)
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tst_brkm(TBROK | TERRNO, cleanup, "dirfd()");
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errno = 0;
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while ((file = readdir(dir))) {
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if (!strcmp(file->d_name, ".") || !strcmp(file->d_name, ".."))
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continue;
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fd = atoi(file->d_name);
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if (fd == dir_fd)
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continue;
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if (rec_fds_max >= (int)ARRAY_SIZE(rec_fds)) {
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tst_brkm(TBROK, cleanup,
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"Too much file descriptors open");
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}
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rec_fds[rec_fds_max++] = fd;
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}
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if (errno)
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tst_brkm(TBROK | TERRNO, cleanup, "readdir()");
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closedir(dir);
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tst_resm(TINFO, "Found %u files open", rec_fds_max);
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}
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static int not_recorded(int fd)
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{
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int i;
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for (i = 0; i < rec_fds_max; i++)
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if (fd == rec_fds[i])
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return 0;
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return 1;
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}
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static void close_test_fds(int max_fd)
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{
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int i;
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for (i = 0; i <= max_fd; i++) {
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if (not_recorded(i)) {
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if (close(i)) {
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if (errno == EBADF)
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continue;
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tst_resm(TWARN | TERRNO, "close(%i)", i);
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}
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}
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}
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}
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static void cleanup(void)
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{
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}
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