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