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 int
  39 main(int argc, char **argv)
  40 {
  41         int i;
  42         struct rlimit limit;
  43         limit.rlim_cur = 65535;
  44         limit.rlim_max = 65535;
  45         if (setrlimit(RLIMIT_NOFILE, &limit) != 0) {
  46                 printf("many_fds: setrlimit() failed with errno=%d\n", errno);
  47                 exit(1);
  48         }
  49 
  50         for (i = 0; i < 255; ++i) {
  51                 int fd = open("/dev/null", O_RDONLY);
  52                 if (fd == -1) {
  53                         printf("open failed with errno=%d\n", errno);
  54                         exit(1);
  55                 }
  56         }
  57 
  58         libzfs_handle_t *h = libzfs_init();
  59         if (h) {
  60                 libzfs_fini(h);
  61                 exit(0);
  62         } else {
  63                 printf("many_fds: libzfs_init() failed with errno=%d\n", errno);
  64                 exit(1);
  65         }
  66 }