NAME
dirname —
extract the directory portion of a
pathname
SYNOPSIS
#include
<libgen.h>
char *
dirname(const
char *path);
DESCRIPTION
The
dirname()
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
PATH_MAX.
SEE ALSO
STANDARDS
The dirname() function conforms to the
X/Open System Interfaces option of the IEEE Std 1003.1-2008
(“POSIX.1”) specification.
HISTORY
The dirname() function first appeared in
OpenBSD 2.2.
AUTHORS
Todd C. Miller
CAVEATS
dirname() 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.