realpath(3) [netbsd man page]

REALPATH(3)						   BSD Library Functions Manual 					       REALPATH(3)

NAME

     realpath -- returns the canonicalized absolute pathname

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <sys/param.h>
     #include <stdlib.h>

     char *
     realpath(const char * restrict pathname, char * restrict resolvedname);

DESCRIPTION

     The realpath() function resolves all symbolic links, extra ``/'' characters and references to /./ and /../ in pathname, and copies the
     resulting absolute pathname into the memory referenced by resolvedname.  The resolvedname argument must refer to a buffer capable of storing
     at least MAXPATHLEN characters.

     The realpath() function will resolve both absolute and relative paths and return the absolute pathname corresponding to pathname.

RETURN VALUES

     If resolvednamed is NULL, it will be allocated and the returned pointer can be deallocated using free(3).	The realpath() function returns
     resolvedname on success.  If an error occurs, realpath() returns NULL, and resolvedname was not allocated by realpath, it will contain 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 chdir(2),
     close(2), fchdir(2), lstat(2), malloc(3), open(2), readlink(2) and getcwd(3).

SEE ALSO

     getcwd(3)

STANDARDS

     realpath() first appeared in X/Open Portability Guide Issue 4, Version 2 (``XPG4.2'') and is part of IEEE Std 1003.1-2001 (``POSIX.1'').

HISTORY

     The realpath() function call first appeared in 4.4BSD.  In NetBSD 7.0 the function was updated to accept a NULL pointer for the resolvedname
     argument.

BUGS

     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 resolvedname when given a relative pathname.

BSD
								   June 21, 2012							       BSD

REALPATH(3)						   BSD Library Functions Manual 					       REALPATH(3)

NAME

     realpath -- returns the canonicalized absolute pathname

SYNOPSIS

     #include <stdlib.h>

     char *
     realpath(const char *restrict file_name, char *restrict resolved_name);

DESCRIPTION

     The realpath() function resolves all symbolic links, extra ``/'' characters, and references to /./ and /../ in file_name.	If the
     resolved_name argument is non-NULL, the resulting absolute pathname is copied there (it must refer to a buffer capable of storing at least
     PATH_MAX characters).

     As a permitted extension to the standard, if resolved_name is NULL, memory is allocated for the resulting absolute pathname, and is returned
     by realpath().  This memory should be freed by a call to free(3) when no longer needed.

     The realpath() function will resolve both absolute and relative paths and return the absolute pathname corresponding to file_name.  All com-
     ponents of file_name must exist when realpath() is called.

RETURN VALUES

     On success, the realpath() function returns the address of the resulting absolute pathname, which is resolved_name if it was non-NULL, or the
     address of newly allocated memory.  If an error occurs, realpath() returns NULL.  If resolved_name was non-NULL, it will contains the path-
     name which caused the problem.

VARIANTS

     Defining _DARWIN_C_SOURCE or _DARWIN_BETTER_REALPATH before including stdio.h will cause the provided implementation of realpath() to use
     F_GETPATH from fcntl(2) to discover the path.

ERRORS

     The function realpath() may fail and set the external variable errno for any of the errors specified for the library functions alloca(3),
     getattrlist(2), getcwd(3), lstat(2), readlink(2), stat(2), and strdup(3).

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

     free(3), getcwd(3), compat(5)

HISTORY

     The realpath() function first appeared in 4.4BSD.

BSD
								   April 5, 2008							       BSD