NAME
realpath — resolve pathname
SYNOPSIS
#include <stdlib.h>
char *realpath(const char *file_name__restrict fP,
char *resolved_name__restrict);
DESCRIPTION
The
realpath()
function derives, from the pathname pointed to by
file_name,
an absolute pathname that names the same file, whose resolution does not
involve
.,
..,
or symbolic links. The generated pathname is stored, up to
a maximum of
{PATH_MAX}
bytes, in the buffer pointed to by
resolved_name.
RETURN VALUE
On successful completion,
realpath()
returns a pointer to the resolved name. Otherwise,
realpath()
returns a null pointer and sets
errno
to indicate the error, and the
contents of the buffer pointed to by
resolved_name
are undefined.
ERRORS
The
realpath()
function will fail if:
- EACCES
Read or search permission was denied for a component of
file_name.
- EINVAL
Either the
file_name
or
resolved_name
argument is a null pointer.
- EIO
An error occurred while reading from the file system.
- ELOOP
Too many symbolic links were encountered in resolving
path.
- ENAMETOOLONG
The
file_name
argument is longer than
{PATH_MAX}
or a pathname component is longer than
{NAME_MAX}.
- ENOENT
A component of
file_name
does not name an existing file
or
file_name
points to an empty string.
- ENOTDIR
A component of the path prefix is not a directory.
The
realpath()
function may fail if:
- ENAMETOOLONG
Pathname resolution of a symbolic link produced an intermediate result whose
length exceeds
{PATH_MAX}.
- ENOMEM
Insufficient storage space is available.
CHANGE HISTORY
First released in Issue 4, Version 2.
Printable version
