stat.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>

static char *filetype(mode_t mode);

int
main(int argc, char *argv[])
{
    struct stat st;

    if (argc != 2) {
        fprintf(stderr, "wrong argument\n");
        exit(1);
    }
    if (lstat(argv[1], &st) < 0) {
        perror(argv[1]);
        exit(1);
    }
    printf("type\t%o (%s)\n", (st.st_mode & S_IFMT), filetype(st.st_mode));
    printf("mode\t%o\n", st.st_mode & ~S_IFMT);
    printf("dev\t%llu\n", (unsigned long long)st.st_dev);
    printf("ino\t%lu\n", (unsigned long)st.st_ino);
    printf("rdev\t%llu\n", (unsigned long long)st.st_rdev);
    printf("nlink\t%lu\n", (unsigned long)st.st_nlink);
    printf("uid\t%d\n", st.st_uid);
    printf("gid\t%d\n", st.st_gid);
    printf("size\t%ld\n", st.st_size);
    printf("blksize\t%lu\n", (unsigned long)st.st_blksize);
    printf("blocks\t%lu\n", (unsigned long)st.st_blocks);
    printf("atime\t%s", ctime(&st.st_atime));
    printf("mtime\t%s", ctime(&st.st_mtime));
    printf("ctime\t%s", ctime(&st.st_ctime));
    exit(0);
}

static char*
filetype(mode_t mode)
{
    if (S_ISREG(mode)) return "file";
    if (S_ISDIR(mode)) return "directory";
    if (S_ISCHR(mode)) return "chardev";
    if (S_ISBLK(mode)) return "blockdev";
    if (S_ISFIFO(mode)) return "fifo";
    if (S_ISLNK(mode)) return "symlink";
    if (S_ISSOCK(mode)) return "socket";
    return "unknown";
}