realpath(3) BSD Library Functions Manual realpath(3)
NAME
realpath -- returns the canonicalized absolute pathname
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
char *
realpath(const char *restrict file_name, char *restrict resolved_name);
DESCRIPTION
The realpath() function resolves all symbolic links, extra ``/'' charac-
ters, and references to /./ and /../ in file_name, and copies the result-
ing absolute pathname into the memory referenced by resolved_name. The
resolved_name argument must refer to a buffer capable of storing at least
PATH_MAX characters.
The realpath() function will resolve both absolute and relative paths and
return the absolute pathname corresponding to file_name. All components
of file_name must exist when realpath() is called.
RETURN VALUES
The realpath() function returns resolved_name on success. If an error
occurs, realpath() returns NULL and resolved_name contains the pathname
which caused the problem.
ERRORS
The function realpath() may fail and set the external variable errno for
any of the errors specified for the library functions lstat(2),
readlink(2), and getcwd(3).
CAVEATS
This implementation of realpath() differs slightly from the Solaris
implementation. The 4.4BSD version always returns absolute pathnames,
whereas the Solaris implementation will, under certain circumstances,
return a relative resolved_name when given a relative file_name.
LEGACY SYNOPSIS
#include <sys/param.h>
#include <stdlib.h>
The include file <sys/param.h> is necessary.
LEGACY DESCRIPTION
In legacy mode, the last component of file_name does not need to exist
when realpath() is called.
SEE ALSO
getcwd(3), compat(5)
HISTORY
The realpath() function first appeared in 4.4BSD.
BSD February 16, 1994 BSD
Mac OS X 10.5 - Generated Sun Oct 28 21:38:10 EDT 2007