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      1 /*
      2  *   Copyright (c) International Business Machines  Corp., 2002
      3  *    ported from SPIE, section2/iosuite/dup1.c, by Airong Zhang
      4  *   Copyright (c) 2013 Cyril Hrubis <chrubis (at) suse.cz>
      5  *
      6  *   This program is free software;  you can redistribute it and/or modify
      7  *   it under the terms of the GNU General Public License as published by
      8  *   the Free Software Foundation; either version 2 of the License, or
      9  *   (at your option) any later version.
     10  *
     11  *   This program is distributed in the hope that it will be useful,
     12  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
     13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
     14  *   the GNU General Public License for more details.
     15  *
     16  *   You should have received a copy of the GNU General Public License
     17  *   along with this program;  if not, write to the Free Software
     18  *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     19  */
     20 
     21 /*
     22   WHAT:  Does dup return -1 on the 21st file?
     23   HOW:   Create up to _NFILE (20) files and check for -1 return on the
     24          next attempt
     25          Should check NOFILE as well as _NFILE.  19-Jun-84 Dale.
     26 */
     27 
     28 #include <stdio.h>
     29 #include <fcntl.h>
     30 #include <errno.h>
     31 #include <unistd.h>
     32 #include <sys/types.h>
     33 #include <sys/stat.h>
     34 #include <sys/param.h>
     35 #include "test.h"
     36 
     37 char *TCID = "dup06";
     38 int TST_TOTAL = 1;
     39 
     40 static int cnt_free_fds(int maxfd)
     41 {
     42 	int freefds = 0;
     43 
     44 	for (maxfd--; maxfd >= 0; maxfd--)
     45 		if (fcntl(maxfd, F_GETFD) == -1 && errno == EBADF)
     46 			freefds++;
     47 
     48 	return (freefds);
     49 }
     50 
     51 static void setup(void);
     52 static void cleanup(void);
     53 
     54 int main(int ac, char **av)
     55 {
     56 	int *fildes, i;
     57 	int min;
     58 	int freefds;
     59 	int lc;
     60 	const char *pfilname = "dup06";
     61 
     62 	tst_parse_opts(ac, av, NULL, NULL);
     63 
     64 	setup();
     65 
     66 	min = getdtablesize();
     67 	freefds = cnt_free_fds(min);
     68 	fildes = malloc((min + 5) * sizeof(int));
     69 
     70 	for (i = 0; i < min + 5; i++)
     71 		fildes[i] = 0;
     72 
     73 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     74 		unlink(pfilname);
     75 
     76 		if ((fildes[0] = creat(pfilname, 0666)) == -1) {
     77 			tst_resm(TFAIL, "Cannot open first file");
     78 		} else {
     79 			for (i = 1; i < min + 5; i++) {
     80 				if ((fildes[i] = dup(fildes[i - 1])) == -1)
     81 					break;
     82 			}
     83 			if (i < freefds) {
     84 				tst_resm(TFAIL, "Not enough files duped");
     85 			} else if (i > freefds) {
     86 				tst_resm(TFAIL, "Too many files duped");
     87 			} else {
     88 				tst_resm(TPASS, "Test passed.");
     89 			}
     90 		}
     91 
     92 		unlink(pfilname);
     93 
     94 		for (i = 0; i < min + 5; i++) {
     95 			if (fildes[i] != 0 && fildes[i] != -1)
     96 				close(fildes[i]);
     97 
     98 			fildes[i] = 0;
     99 		}
    100 	}
    101 
    102 	cleanup();
    103 	tst_exit();
    104 }
    105 
    106 static void setup(void)
    107 {
    108 	tst_tmpdir();
    109 }
    110 
    111 static void cleanup(void)
    112 {
    113 	tst_rmdir();
    114 }
    115