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