NAME
dirname —
extract the directory part of a
pathname
LIBRARY
library “libc”
SYNOPSIS
#include
<libgen.h>
char *
dirname(const
char *path);
DESCRIPTION
Thedirname()
function is the converse of
basename(3); it returns a pointer to the parent directory of the
pathname pointed to by path. Any trailing
‘/’ characters are not counted as part of the directory name. If
path is a null pointer, the empty string, or contains no
‘/’ characters, dirname() returns a
pointer to the string ".", signifying the current directory.
RETURN VALUES
On successful completion, dirname()
returns a pointer to the parent directory of path.
If dirname() fails, a null pointer is
returned and the global variable errno is set to
indicate the error.
ERRORS
The following error codes may be set in errno:
- [
ENAMETOOLONG] - The path component to be returned was larger than
MAXPATHLEN.
WARNINGS
The
dirname()
function returns a pointer to internal static storage space that will be
overwritten by subsequent calls (each function has its own separate
storage).
Other vendor implementations of
dirname()
may modify the contents of the string passed to
dirname(); this should be taken into account when
writing code which calls this function if portability is desired.
SEE ALSO
STANDARDS
The dirname() function conforms to
X/Open Portability Guide Issue 4, Version 2
(“XPG4.2”).
HISTORY
The dirname() function first appeared in
OpenBSD 2.2 and FreeBSD
4.2.
AUTHORS
Todd C. Miller <Todd.Miller@courtesan.com>