71 lines
1.4 KiB
C
Executable file
71 lines
1.4 KiB
C
Executable file
/* mknod - build a special file Author: Andy Tanenbaum */
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#include <sys/types.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <minix/minlib.h>
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#include <errno.h>
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#include <stdio.h>
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_PROTOTYPE(int main, (int argc, char *argv []));
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_PROTOTYPE(void badcomm, (void));
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_PROTOTYPE(void badfifo, (void));
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_PROTOTYPE(void badchar, (void));
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_PROTOTYPE(void badblock, (void));
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int main(argc, argv)
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int argc;
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char *argv[];
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{
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/* Mknod name b/c major minor makes a node. */
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int mode, major, minor, dev;
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if (argc < 3) badcomm();
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if (*argv[2] != 'b' && *argv[2] != 'c' && *argv[2] != 'p') badcomm();
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if (*argv[2] == 'p' && argc != 3) badfifo();
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if (*argv[2] == 'c' && argc != 5) badchar();
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if (*argv[2] == 'b' && argc != 5) badblock();
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if (*argv[2] == 'p') {
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mode = 010666;
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dev = 0;
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} else {
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mode = (*argv[2] == 'b' ? 060666 : 020666);
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major = atoi(argv[3]);
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minor = atoi(argv[4]);
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if (major - 1 > 0xFE || minor > 0xFF) badcomm();
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dev = (major << 8) | minor;
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}
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if (mknod(argv[1], mode, dev) < 0) {
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int err = errno;
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std_err("mknod: ");
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errno = err;
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perror(argv[1]);
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}
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return(0);
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}
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void badcomm()
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{
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std_err("Usage: mknod name b/c/p [major minor]\n");
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exit(1);
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}
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void badfifo()
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{
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std_err("Usage: mknod name p\n");
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exit(1);
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}
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void badchar()
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{
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std_err("Usage: mknod name c major minor\n");
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exit(1);
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}
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void badblock()
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{
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std_err("Usage: mknod name b major minor\n");
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exit(1);
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}
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