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

     /*
      * This file and its contents are supplied under the terms of the
      * Common Development and Distribution License ("CDDL"), version 1.0.
      * You may only use this file in accordance with the terms of version
      * 1.0 of the CDDL.
      *
      * A full copy of the text of the CDDL should have accompanied this
      * source.  A copy of the CDDL is also available via the Internet at
      * http://www.illumos.org/license/CDDL.
     */
    
    /*
     * Copyright (c) 2016 by Delphix. All rights reserved.
     */
    
    #include <stdio.h>
    #include <stdlib.h>
    #include <fcntl.h>
    #include <string.h>
    #include <errno.h>
    #include <unistd.h>
    #include <sys/param.h>
    
    static void
    usage(const char *msg, int exit_value)
    {
            (void) fprintf(stderr, "usage: mkfiles basename max_file [min_file]\n"
                "%s\n", msg);
            exit(exit_value);
    }
    
    int
    main(int argc, char **argv)
    {
            unsigned int numfiles = 0;
            unsigned int first_file = 0;
            unsigned int i;
            char buf[MAXPATHLEN];
    
            if (argc < 3 || argc > 4)
                    usage("Invalid number of arguments", 1);
    
            if (sscanf(argv[2], "%u", &numfiles) != 1)
                    usage("Invalid maximum file", 2);
    
            if (argc == 4 && sscanf(argv[3], "%u", &first_file) != 1)
                    usage("Invalid first file", 3);
    
            for (i = first_file; i < first_file + numfiles; i++) {
                    int fd;
                    (void) snprintf(buf, MAXPATHLEN, "%s%u", argv[1], i);
                    if ((fd = open(buf, O_CREAT | O_EXCL, O_RDWR)) == -1) {
                            (void) fprintf(stderr, "Failed to create %s %s\n", buf,
                                strerror(errno));
                            return (4);
                    } else if (fchown(fd, getuid(), getgid()) < 0) {
                            (void) fprintf(stderr, "Failed to chown %s %s\n", buf,
                                strerror(errno));
                            return (5);
                    }
                    (void) close(fd);
            }
            return (0);
    }

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