usr/src/test/zfs-tests/cmd/mkfiles/mkfiles.c

   1 /*
   2  * This file and its contents are supplied under the terms of the
   3  * Common Development and Distribution License ("CDDL"), version 1.0.
   4  * You may only use this file in accordance with the terms of version
   5  * 1.0 of the CDDL.
   6  *
   7  * A full copy of the text of the CDDL should have accompanied this
   8  * source.  A copy of the CDDL is also available via the Internet at
   9  * http://www.illumos.org/license/CDDL.
  10  */
  11
  12 /*
  13  * Copyright (c) 2016 by Delphix. All rights reserved.
  14  */
  15
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <fcntl.h>
  19 #include <string.h>
  20 #include <errno.h>
  21 #include <unistd.h>
  22 #include <sys/param.h>
  23
  24 #define MAX_INT_LENGTH 10
  25
  26 static void
  27 usage(char *msg, int exit_value)
  28 {
  29         (void) fprintf(stderr, "mkfiles basename max_file [min_file]\n");
  30         (void) fprintf(stderr, "%s\n", msg);
  31         exit(exit_value);
  32 }
  33
  34 int
  35 main(int argc, char **argv)
  36 {
  37         unsigned int numfiles = 0;
  38         unsigned int first_file = 0;
  39         if (argc < 3 || argc > 4)
  40                 usage("Invalid number of arguments", -1);
  41
  42         if (sscanf(argv[2], "%u", &numfiles) != 1)
  43                 usage("Invalid maximum file", -2);
  44
  45         if (argc == 4 && sscanf(argv[3], "%u", &first_file) != 1)
  46                 usage("Invalid first file", -3);
  47
  48         if (numfiles < first_file)
  49                 usage("First file larger than last file", -3);
  50
  51         char buf[MAXPATHLEN];
  52         for (unsigned int i = first_file; i <= numfiles; i++) {
  53                 int fd;
  54                 (void) snprintf(buf, MAXPATHLEN, "%s%u", argv[1], i);
  55                 if ((fd = open(buf, O_CREAT | O_EXCL, O_RDWR)) == -1) {
  56                         (void) fprintf(stderr, "Failed to create %s %s\n", buf,
  57                             strerror(errno));
  58                         return (-4);
  59                 }
  60                 (void) close(fd);
  61         }
  62         return (0);
  63 }