minix/lib/posix/_opendir.c

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2005-04-21 16:53:53 +02:00
/* 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;
}