commands/simple/mknod.c

   1 /* mknod - build a special file         Author: Andy Tanenbaum */
   2
   3 #include <sys/types.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include <minix/minlib.h>
   7 #include <errno.h>
   8 #include <stdio.h>
   9
  10 _PROTOTYPE(int main, (int argc, char *argv []));
  11 _PROTOTYPE(void badcomm, (void));
  12 _PROTOTYPE(void badfifo, (void));
  13 _PROTOTYPE(void badchar, (void));
  14 _PROTOTYPE(void badblock, (void));
  15
  16 int main(argc, argv)
  17 int argc;
  18 char *argv[];
  19 {
  20 /* Mknod name b/c major minor makes a node. */
  21
  22   int mode, major, minor, dev;
  23
  24   if (argc < 3) badcomm();
  25   if (*argv[2] != 'b' && *argv[2] != 'c' && *argv[2] != 'p') badcomm();
  26   if (*argv[2] == 'p' && argc != 3) badfifo();
  27   if (*argv[2] == 'c' && argc != 5) badchar();
  28   if (*argv[2] == 'b' && argc != 5) badblock();
  29   if (*argv[2] == 'p') {
  30         mode = 010666;
  31         dev = 0;
  32   } else {
  33         mode = (*argv[2] == 'b' ? 060666 : 020666);
  34         major = atoi(argv[3]);
  35         minor = atoi(argv[4]);
  36         if (major - 1 > 0xFE || minor > 0xFF) badcomm();
  37         dev = (major << 8) | minor;
  38   }
  39   if (mknod(argv[1], mode, dev) < 0) {
  40         int err = errno;
  41         std_err("mknod: ");
  42         errno = err;
  43         perror(argv[1]);
  44   }
  45   return(0);
  46 }
  47
  48 void badcomm()
  49 {
  50   std_err("Usage: mknod name b/c/p [major minor]\n");
  51   exit(1);
  52 }
  53
  54 void badfifo()
  55 {
  56   std_err("Usage: mknod name p\n");
  57   exit(1);
  58 }
  59
  60 void badchar()
  61 {
  62   std_err("Usage: mknod name c major minor\n");
  63   exit(1);
  64 }
  65
  66 void badblock()
  67 {
  68   std_err("Usage: mknod name b major minor\n");
  69   exit(1);
  70 }