minix/commands/simple/mknod.c

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2005-04-21 16:53:53 +02:00
/* mknod - build a special file Author: Andy Tanenbaum */
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <minix/minlib.h>
#include <errno.h>
#include <stdio.h>
_PROTOTYPE(int main, (int argc, char *argv []));
_PROTOTYPE(void badcomm, (void));
_PROTOTYPE(void badfifo, (void));
_PROTOTYPE(void badchar, (void));
_PROTOTYPE(void badblock, (void));
int main(argc, argv)
int argc;
char *argv[];
{
/* Mknod name b/c major minor makes a node. */
int mode, major, minor, dev;
if (argc < 3) badcomm();
if (*argv[2] != 'b' && *argv[2] != 'c' && *argv[2] != 'p') badcomm();
if (*argv[2] == 'p' && argc != 3) badfifo();
if (*argv[2] == 'c' && argc != 5) badchar();
if (*argv[2] == 'b' && argc != 5) badblock();
if (*argv[2] == 'p') {
mode = 010666;
dev = 0;
} else {
mode = (*argv[2] == 'b' ? 060666 : 020666);
major = atoi(argv[3]);
minor = atoi(argv[4]);
if (major - 1 > 0xFE || minor > 0xFF) badcomm();
dev = (major << 8) | minor;
}
if (mknod(argv[1], mode, dev) < 0) {
int err = errno;
std_err("mknod: ");
errno = err;
perror(argv[1]);
}
return(0);
}
void badcomm()
{
std_err("Usage: mknod name b/c/p [major minor]\n");
exit(1);
}
void badfifo()
{
std_err("Usage: mknod name p\n");
exit(1);
}
void badchar()
{
std_err("Usage: mknod name c major minor\n");
exit(1);
}
void badblock()
{
std_err("Usage: mknod name b major minor\n");
exit(1);
}