largest_file.c

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    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 https://opensource.org/licenses/CDDL-1.0.
   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 2007 Sun Microsystems, Inc.  All rights reserved.
   24  * Use is subject to license terms.
   25  */
   26 
   27 /*
   28  * Copyright (c) 2012 by Delphix. All rights reserved.
   29  */
   30 
   31 #include "file_common.h"
   32 #include <sys/param.h>
   33 #include <signal.h>
   34 #include <stdio.h>
   35 #include <string.h>
   36 #include <sys/stdtypes.h>
   37 #include <unistd.h>
   38 
   39 /*
   40  * --------------------------------------------------------------
   41  *
   42  *      Assertion:
   43  *              The last byte of the largest file size can be
   44  *              accessed without any errors.  Also, the writing
   45  *              beyond the last byte of the largest file size
   46  *              will produce an errno of EFBIG.
   47  *
   48  * --------------------------------------------------------------
   49  *      If the write() system call below returns a "1",
   50  *      then the last byte can be accessed.
   51  * --------------------------------------------------------------
   52  */
   53 static void     sigxfsz(int);
   54 static void     usage(char *);
   55 
   56 int
   57 main(int argc, char **argv)
   58 {
   59         int             fd = 0;
   60         offset_t        offset = (MAXOFFSET_T - 1);
   61         offset_t        llseek_ret = 0;
   62         int             write_ret = 0;
   63         int             err = 0;
   64         char            mybuf[5] = "aaaa\0";
   65         char            *testfile;
   66         mode_t          mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
   67         struct sigaction sa;
   68 
   69         if (argc != 2) {
   70                 usage(argv[0]);
   71         }
   72 
   73         if (sigemptyset(&sa.sa_mask) == -1)
   74                 return (errno);
   75         sa.sa_flags = 0;
   76         sa.sa_handler = sigxfsz;
   77         if (sigaction(SIGXFSZ, &sa, NULL) == -1)
   78                 return (errno);
   79 
   80         testfile = strdup(argv[1]);
   81         if (testfile == NULL)
   82                 return (errno);
   83 
   84         fd = open(testfile, O_CREAT | O_RDWR, mode);
   85         if (fd < 0) {
   86                 err = errno;
   87                 perror("Failed to create testfile");
   88                 free(testfile);
   89                 return (err);
   90         }
   91 
   92         llseek_ret = lseek64(fd, offset, SEEK_SET);
   93         if (llseek_ret < 0) {
   94                 err = errno;
   95                 perror("Failed to seek to end of testfile");
   96                 goto out;
   97         }
   98 
   99         write_ret = write(fd, mybuf, 1);
  100         if (write_ret < 0) {
  101                 err = errno;
  102                 perror("Failed to write to end of file");
  103                 goto out;
  104         }
  105 
  106         offset = 0;
  107         llseek_ret = lseek64(fd, offset, SEEK_CUR);
  108         if (llseek_ret < 0) {
  109                 err = errno;
  110                 perror("Failed to seek to end of file");
  111                 goto out;
  112         }
  113 
  114         write_ret = write(fd, mybuf, 1);
  115         if (write_ret < 0) {
  116                 if (errno == EFBIG || errno == EINVAL) {
  117                         (void) printf("write errno=EFBIG|EINVAL: success\n");
  118                         err = 0;
  119                 } else {
  120                         err = errno;
  121                         perror("Did not receive EFBIG");
  122                 }
  123         } else {
  124                 (void) printf("write completed successfully, test failed\n");
  125                 err = 1;
  126         }
  127 
  128 out:
  129         (void) unlink(testfile);
  130         free(testfile);
  131         close(fd);
  132         return (err);
  133 }
  134 
  135 static void
  136 usage(char *name)
  137 {
  138         (void) printf("%s <testfile>\n", name);
  139         exit(1);
  140 }
  141 
  142 static void
  143 sigxfsz(int signo)
  144 {
  145         (void) signo;
  146         (void) printf("\nlargest_file: sigxfsz() caught SIGXFSZ\n");
  147 }

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FreeBSD/Linux Kernel Cross Reference sys/contrib/openzfs/tests/zfs-tests/cmd/file/largest_file.c

FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/tests/zfs-tests/cmd/file/largest_file.c