openfilleddirunlink.c

lustre 1.6.5 source code

/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
 * vim:expandtab:shiftwidth=8:tabstop=8:
 */

/* for O_DIRECTORY */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <string.h>

char fname[1024];


int main(int argc, char **argv)
{
        char *dname1;
        int fddir1, rc;
        int fd;

        if (argc != 2) {
                fprintf(stderr, "usage: %s dirname1\n", argv[0]);
                exit(1);
        }

        dname1 = argv[1];

        //create the directory
        fprintf(stderr, "creating directory %s\n", dname1);
        rc = mkdir(dname1, 0744);
        if (rc == -1) {
                fprintf(stderr, "creating %s fails: %s\n",
                        dname1, strerror(errno));
                exit(1);
        }

        sprintf(fname, "%s/0", dname1);
        fprintf(stderr, "creating file %s\n", fname);
        fd = creat(fname, 0666);
        if (fd < 0) {
                fprintf(stderr, "creation %s fails: %s\n",
                        fname, strerror(errno));
                exit(1);
        }
        close(fd);

        // open the dir again
        fprintf(stderr, "opening directory\n");
        fddir1 = open(dname1, O_RDONLY | O_DIRECTORY);
        if (fddir1 == -1) {
                fprintf(stderr, "open %s fails: %s\n",
                        dname1, strerror(errno));
                exit(1);
        }

        // delete the dir
        fprintf(stderr, "unlinking %s\n", dname1);
        rc = rmdir(dname1);
        if (rc == 0) {
                fprintf(stderr, "unlinked non-empty %s successfully\n",
                        dname1);
                exit(1);
        }

        if (access(dname1, F_OK) != 0){
                fprintf(stderr, "can't access %s: %s\n",
                        dname1, strerror(errno));
                exit(1);
        }

        fprintf(stderr, "Ok, everything goes well.\n");
        return 0;
}