devrdev.c

UNIX高级环境编程（第二版）文件系统部分的程序

#include    <sys/types.h>    /* BSD: defines major() and minor() */
#include    <sys/stat.h>
#include    "ourhdr.h"

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

    for (i = 1; i < argc; i++) {
        printf("%s: ", argv[i]);
        if (lstat(argv[i], &buf) < 0) {
            err_ret("lstat error");
            continue;
        }

        printf("dev = %d/%d", major(buf.st_dev),  minor(buf.st_dev));

        if (S_ISCHR(buf.st_mode) || S_ISBLK(buf.st_mode)) {
            printf(" (%s) rdev = %d/%d",
                    (S_ISCHR(buf.st_mode)) ? "character" : "block",
                    major(buf.st_rdev), minor(buf.st_rdev));
        }
        printf("\n");
    }
    exit(0);
}