NAME
directory, opendir, readdir, rewinddir, closedir, telldir,
seekdir - directory routines
SYNOPSIS
#include <sys/types.h>
#include <dirent.h>
DIR *opendir(const char *dirname)
struct dirent *readdir(DIR *dirp)
void rewinddir(DIR *dirp)
int closedir(DIR *dirp)
#define _MINIX 1
#include <sys/types.h>
#include <dirent.h>
long telldir(DIR *dirp)
int seekdir(DIR *dirp, long pos)
DESCRIPTION
These routines form a system independent interface to access
directories.
Opendir() opens the directory dirname and returns a pointer
to this open directory stream.
Readdir() reads one entry from the directory as a pointer to
a structure containing the field d_name, a character array
containing the null-terminated name of the entry.
Rewinddir() allows the directory to be read again from the
beginning.
Closedir() closes the directory and releases administrative
data.
The MINIX 3 specific functions telldir() and seekdir() allow
one to get the current position in the directory file and to
return there later. Seekdir() may only be called with a
position returned by telldir() or 0 (rewind). These func-
tions should not be used in portable programs.
SEE ALSO
dir(5).
DIAGNOSTICS
Opendir() returns a null pointer if dirname can't be opened,
or if it can't allocate enough memory for the DIR structure.
Readdir() returns null if there are no more directory
entries or on error.
Closedir() and seekdir() returns 0 on success, -1 on error.
Telldir() returns -1 on error.
All of them set errno appropriately. Readdir() will only
set errno on error, not on end-of-dir, so you should set
errno to zero beforehand, and check its value if readdir()
returns null.
NOTES
The return value of readdir() needs to be copied before the
next operation on the same directory if it is to be saved.
AUTHOR
Kees J. Bot (kjb@cs.vu.nl)