Attachment 581826 Details for Bug 817785 – Little test program taken from 'man 2 getdents'

Little test program taken from 'man 2 getdents'

check-dirent-d_type.c (text/plain), 1.85 KB, created by Niels de Vos on 2012-05-03 10:49:51 UTC

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Creator: Niels de Vos

Created: 2012-05-03 10:49:51 UTC

Size: 1.85 KB

patch

obsolete

>/* example program from 'man 2 getdents' */
>
>#define _GNU_SOURCE
>#include <dirent.h>     /* Defines DT_* constants */
>#include <fcntl.h>
>#include <stdio.h>
>#include <unistd.h>
>#include <stdlib.h>
>#include <sys/stat.h>
>#include <sys/syscall.h>
>
>#define handle_error(msg) \
>        do { perror(msg); exit(EXIT_FAILURE); } while (0)
>
>struct linux_dirent {
>    long           d_ino;
>    off_t          d_off;
>    unsigned short d_reclen;
>    char           d_name[];
>};
>
>#define BUF_SIZE 1024
>
>int
>main(int argc, char *argv[])
>{
>    int fd, nread;
>    char buf[BUF_SIZE];
>    struct linux_dirent *d;
>    int bpos;
>    char d_type;
>
>    fd = open(argc > 1 ? argv[1] : ".", O_RDONLY | O_DIRECTORY);
>    if (fd == -1)
>        handle_error("open");
>
>    for ( ; ; ) {
>        nread = syscall(SYS_getdents, fd, buf, BUF_SIZE);
>        if (nread == -1)
>            handle_error("getdents");
>
>        if (nread == 0)
>            break;
>
>        printf("--------------- nread=%d ---------------\n", nread);
>        printf("i-node#  file type  d_reclen  d_off   d_name\n");
>        for (bpos = 0; bpos < nread;) {
>            d = (struct linux_dirent *) (buf + bpos);
>            printf("%8ld  ", d->d_ino);
>            d_type = *(buf + bpos + d->d_reclen - 1);
>            printf("%-10s ", (d_type == DT_REG) ?  "regular" :
>                             (d_type == DT_DIR) ?  "directory" :
>                             (d_type == DT_FIFO) ? "FIFO" :
>                             (d_type == DT_SOCK) ? "socket" :
>                             (d_type == DT_LNK) ?  "symlink" :
>                             (d_type == DT_BLK) ?  "block dev" :
>                             (d_type == DT_CHR) ?  "char dev" : "???");
>            printf("%4d %10lld  %s\n", d->d_reclen,
>                    (long long) d->d_off, (char *) d->d_name);
>            bpos += d->d_reclen;
>        }
>    }
>
>    exit(EXIT_SUCCESS);
>}
>

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Attachments on bug 817785: 581826