RESOLVEPATH(2) System Calls RESOLVEPATH(2)


NAME


resolvepath - resolve all symbolic links of a path name

SYNOPSIS


#include <unistd.h>

int resolvepath(const char *path, char *buf, size_t bufsiz);


DESCRIPTION


The resolvepath() function fully resolves all symbolic links in the path
name path into a resulting path name free of symbolic links and places
the resulting path name in the buffer buf which has size bufsiz. The
resulting path name names the same file or directory as the original path
name. All ``.'' components are eliminated and every non-leading ``..''
component is eliminated together with its preceding directory component.
If leading ``..'' components reach to the root directory, they are
replaced by ``/''. If the number of bytes in the resulting path name is
less than bufsiz, the contents of the remainder of buf are unspecified.

RETURN VALUES


Upon successful completion, resolvepath() returns the count of bytes
placed in the buffer. Otherwise, it returns -1, leaves the buffer
unchanged, and sets errno to indicate the error.

ERRORS


The resolvepath() function will fail if:

EACCES
Search permission is denied for a component of the path
prefix of path or for a path prefix component resulting
from the resolution of a symbolic link.


EFAULT
The path or buf argument points to an illegal address.


EIO
An I/O error occurred while reading from the file system.


ENOENT
The path argument is an empty string or a component of
path or a path name component produced by resolving a
symbolic link does not name an existing file.


ELOOP
Too many symbolic links were encountered in resolving
path.


ENAMETOOLONG
The length of path exceeds PATH_MAX, or a path name
component is longer than NAME_MAX. Path name resolution
of a symbolic link produced an intermediate result whose
length exceeds PATH_MAX or a component whose length
exceeds NAME_MAX.


ENOTDIR
A component of the path prefix of path or of a path
prefix component resulting from the resolution of a
symbolic link is not a directory.


USAGE


No more than PATH_MAX bytes will be placed in the buffer. Applications
should not assume that the returned contents of the buffer are null-
terminated.

SEE ALSO


readlink(2), realpath(3C)


May 12, 1997 RESOLVEPATH(2)