source: trunk/minix/lib/posix/_opendir.c@ 15

/*      opendir()                                       Author: Kees J. Bot
 *                                                              24 Apr 1989
 */
#define nil 0
#include <lib.h>
#define close   _close
#define fcntl   _fcntl
#define fstat   _fstat
#define open    _open
#define opendir _opendir
#define stat    _stat
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>

DIR *opendir(const char *name)
/* Open a directory for reading. */
{
        int d, f;
        DIR *dp;
        struct stat st;

        /* Only read directories. */
        if (stat(name, &st) < 0) return nil;
        if (!S_ISDIR(st.st_mode)) { errno= ENOTDIR; return nil; }

        if ((d= open(name, O_RDONLY | O_NONBLOCK)) < 0) return nil;

        /* Check the type again, mark close-on-exec, get a buffer. */
        if (fstat(d, &st) < 0
                || (errno= ENOTDIR, !S_ISDIR(st.st_mode))
                || (f= fcntl(d, F_GETFD)) < 0
                || fcntl(d, F_SETFD, f | FD_CLOEXEC) < 0
                || (dp= (DIR *) malloc(sizeof(*dp))) == nil
        ) {
                int err= errno;
                (void) close(d);
                errno= err;
                return nil;
        }

        dp->_fd= d;
        dp->_v7= -1;
        dp->_count= 0;
        dp->_pos= 0;

        return dp;
}