53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
/* opendir() Author: Kees J. Bot
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* 24 Apr 1989
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*/
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#define nil 0
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#include <lib.h>
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#define close _close
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#define fcntl _fcntl
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#define fstat _fstat
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#define open _open
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#define opendir _opendir
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#define stat _stat
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <errno.h>
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DIR *opendir(const char *name)
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/* Open a directory for reading. */
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{
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int d, f;
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DIR *dp;
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struct stat st;
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/* Only read directories. */
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if (stat(name, &st) < 0) return nil;
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if (!S_ISDIR(st.st_mode)) { errno= ENOTDIR; return nil; }
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if ((d= open(name, O_RDONLY | O_NONBLOCK)) < 0) return nil;
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/* Check the type again, mark close-on-exec, get a buffer. */
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if (fstat(d, &st) < 0
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|| (errno= ENOTDIR, !S_ISDIR(st.st_mode))
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|| (f= fcntl(d, F_GETFD)) < 0
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|| fcntl(d, F_SETFD, f | FD_CLOEXEC) < 0
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|| (dp= (DIR *) malloc(sizeof(*dp))) == nil
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) {
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int err= errno;
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(void) close(d);
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errno= err;
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return nil;
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}
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dp->_fd= d;
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dp->_count= 0;
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dp->_pos= 0;
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return dp;
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}
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