commands/mknod/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 #ifdef __NBSD_LIBC
  10 #include <sys/stat.h>
  11 #endif
  12
  13 int main(int argc, char *argv []);
  14 void badcomm(void);
  15 void badfifo(void);
  16 void badchar(void);
  17 void badblock(void);
  18
  19 int main(argc, argv)
  20 int argc;
  21 char *argv[];
  22 {
  23 /* Mknod name b/c major minor makes a node. */
  24
  25   int mode, major, minor, dev;
  26
  27   if (argc < 3) badcomm();
  28   if (*argv[2] != 'b' && *argv[2] != 'c' && *argv[2] != 'p') badcomm();
  29   if (*argv[2] == 'p' && argc != 3) badfifo();
  30   if (*argv[2] == 'c' && argc != 5) badchar();
  31   if (*argv[2] == 'b' && argc != 5) badblock();
  32   if (*argv[2] == 'p') {
  33         mode = 010666;
  34         dev = 0;
  35   } else {
  36         mode = (*argv[2] == 'b' ? 060666 : 020666);
  37         major = atoi(argv[3]);
  38         minor = atoi(argv[4]);
  39         if (major - 1 > 0xFE || minor > 0xFF) badcomm();
  40         dev = (major << 8) | minor;
  41   }
  42   if (mknod(argv[1], mode, dev) < 0) {
  43         int err = errno;
  44         std_err("mknod: ");
  45         errno = err;
  46         perror(argv[1]);
  47   }
  48   return(0);
  49 }
  50
  51 void badcomm()
  52 {
  53   std_err("Usage: mknod name b/c/p [major minor]\n");
  54   exit(1);
  55 }
  56
  57 void badfifo()
  58 {
  59   std_err("Usage: mknod name p\n");
  60   exit(1);
  61 }
  62
  63 void badchar()
  64 {
  65   std_err("Usage: mknod name c major minor\n");
  66   exit(1);
  67 }
  68
  69 void badblock()
  70 {
  71   std_err("Usage: mknod name b major minor\n");
  72   exit(1);
  73 }