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      1 /*
      2  * Copyright (c) 2014, The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *  * Neither the name of Google, Inc. nor the names of its contributors
     15  *    may be used to endorse or promote products derived from this
     16  *    software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     22  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     25  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     28  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 #include <stdio.h>
     32 #include <stdlib.h>
     33 #include <unistd.h>
     34 #include <sys/stat.h>
     35 
     36 static int print_usage() {
     37     fprintf(stderr, "mknod <path> [b|c|u|p] <major> <minor>\n");
     38     return EXIT_FAILURE;
     39 }
     40 
     41 int mknod_main(int argc, char **argv) {
     42     char *path = NULL;
     43     int major = 0;
     44     int minor = 0;
     45     int args = 0;
     46     mode_t mode = 0660;
     47 
     48     /* Check correct argument count is 3 or 5 */
     49     if (argc != 3 && argc != 5) {
     50         fprintf(stderr, "Incorrect argument count\n");
     51         return print_usage();
     52     }
     53 
     54     path = argv[1];
     55 
     56     const char node_type = *argv[2];
     57     switch (node_type) {
     58     case 'b':
     59         mode |= S_IFBLK;
     60         args = 5;
     61         break;
     62     case 'c':
     63     case 'u':
     64         mode |= S_IFCHR;
     65         args = 5;
     66         break;
     67     case 'p':
     68         mode |= S_IFIFO;
     69         args = 3;
     70         break;
     71     default:
     72         fprintf(stderr, "Invalid node type '%c'\n", node_type);
     73         return print_usage();
     74     }
     75 
     76     if (argc != args) {
     77         if (args == 5) {
     78             fprintf(stderr, "Node type '%c' requires <major> and <minor>\n", node_type);
     79         } else {
     80             fprintf(stderr, "Node type '%c' does not require <major> and <minor>\n", node_type);
     81         }
     82         return print_usage();
     83     }
     84 
     85     if (args == 5) {
     86         major = atoi(argv[3]);
     87         minor = atoi(argv[4]);
     88     }
     89 
     90     if (mknod(path, mode, makedev(major, minor))) {
     91         perror("Unable to create node");
     92         return EXIT_FAILURE;
     93     }
     94     return 0;
     95 }
     96