usr/src/test/zfs-tests/tests/functional/libzfs/many_fds.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright (C) 2015 STRATO AG.
  24  */
  25 #include <stdlib.h>
  26 #include <stdio.h>
  27 #include <unistd.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <libzfs.h>
  32 #include <sys/resource.h>
  33 #include <errno.h>
  34
  35 /*
  36  * Check if libzfs works with more than 255 held file handles.
  37  */
  38 /* ARGSUSED */
  39 int
  40 main(int argc, char **argv)
  41 {
  42         int i;
  43         struct rlimit limit;
  44         libzfs_handle_t *h;
  45
  46         limit.rlim_cur = 65535;
  47         limit.rlim_max = 65535;
  48
  49         if (setrlimit(RLIMIT_NOFILE, &limit) != 0) {
  50                 (void) printf("many_fds: setrlimit() failed with errno=%d\n",
  51                     errno);
  52                 exit(1);
  53         }
  54
  55         for (i = 0; i < 255; ++i) {
  56                 int fd = open("/dev/null", O_RDONLY);
  57                 if (fd == -1) {
  58                         (void) printf("open failed with errno=%d\n", errno);
  59                         return (1);
  60                 }
  61         }
  62
  63         h = libzfs_init();
  64
  65         if (h != NULL) {
  66                 libzfs_fini(h);
  67                 return (0);
  68         } else {
  69                 (void) printf("many_fds: libzfs_init() failed with errno=%d\n",
  70                     errno);
  71                 return (1);
  72         }
  73 }