minix/commands/simple/dev2name.c

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/* Translate internal FS device number to a /dev/ name. */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <dirent.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <minix/config.h>
#include <minix/const.h>
#define PATH_DEV "/dev"
int
main(int argc, char *argv[])
{
DIR *dev;
struct dirent *e;
int dev_n;
if(argc <= 1 || argc > 3) {
fprintf(stderr, "Usage: \n"
"%s <major> <minor>\n"
"%s <devicenumber>\n", argv[0], argv[0]);
return 1;
} else if(argc == 2) dev_n = atoi(argv[1]);
else if(argc == 3) dev_n = (atoi(argv[1]) << MAJOR) | atoi(argv[2]);
if(chdir(PATH_DEV) < 0) {
perror(PATH_DEV " chdir");
return 1;
}
if(!(dev=opendir("."))) {
perror(". in " PATH_DEV);
return 1;
}
while((e=readdir(dev))) {
struct stat st;
if(stat(e->d_name, &st) < 0) {
continue;
}
if((st.st_mode & (S_IFBLK | S_IFCHR)) && dev_n == st.st_rdev) {
printf("%s/%s\n", PATH_DEV, e->d_name);
return 0;
}
}
return 1;
}