realpath(3)realpath(3)NAMErealpath - Resolve pathname
SYNOPSIS
#include <stdlib.h>
char *realpath(
const char *file_name,
char *resolved_name );
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
realpath(): POSIX.1, XPG4-UNIX
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
DESCRIPTION
The realpath() function derives, from the file 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 VALUES
Upon successful completion, the realpath() function 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
If the realpath() function fails, errno may be set to one of the fol‐
lowing values: Read or search permission was denied for a component of
file_name. Either the file_name or resolved_name argument is a null
pointer. An error occurred while reading from the file system. Too
many symbolic links were encountered in resolving path. The file_name
argument is longer than PATH_MAX or a pathname component is longer than
NAME_MAX. A component of file_name does not name an existing file or
file_name points to an empty string. Insufficient storage space avail‐
able. A component of either path prefix is not a directory.
SEE ALSO
Functions: getcwd(3), sysconf(3)
Standards: standards(5)realpath(3)