RFIO_SYMLINK(3) 					      Rfio Library Functions						   RFIO_SYMLINK(3)

NAME

       rfio_symlink - create a symbolic link to a file

SYNOPSIS

       #include <sys/types.h>
       #include "rfio_api.h"

       int rfio_symlink (const char *oldpath, const char *newpath);
       int rfio_msymlink (const char *oldpath, const char *newpath);
       int rfio_msymlink_reset ();
       int rfio_symend ();

DESCRIPTION

       rfio_symlink creates a symbolic link newpath which contains the string oldpath.

       newpath may point to a non existing file.
       If newpath exists already, it will not be overwritten.
       Write permission is required on newpath parent.

       rfio_msymlink  is  identical  to  rfio_symlink  but  keeps the connection open to the server unless there are more than MAXMCON connections
       already opened. This is useful when issuing a series of symlink calls.  The last rfio_msymlink  call  should  be  followed  by  a  call	to
       rfio_symend.

       rfio_msymlink_reset  is	to be used when your program is forking. In such a case the permanent connections opened with rfio_msymlink become
       shared between the parent and the child. Use rfio_msymlink_reset to perform the necessary reset and close of the socket file descriptor	in
       the parent or the child in order to be sure that only of them will receice an answer from the RFIO daemon.

       See NOTES section below.

RETURN VALUE

       This routine returns 0 if the operation was successful or -1 if the operation failed. In the latter case, serrno is set appropriately.

NOTES

       Multiple  connections  using rfio_msymlink are thread-safe but not process-wide, therefore a forked child can share file descriptors opened
       with rfio_msymlink by its parent. Use rfio_msymlink_reset in such case.

       Multiple connections behaviour is undefined if you work in a multi-threaded environment and  with  threads  not	created  using	the  LCG's
       Cthread interface.

ERRORS

       ENOENT	    A component of newpath prefix does not exist or oldpath is a null pathname.

       ENOMEM	    Insufficient memory.

       EACCES	    Search  permission	is  denied  on	a  component  of the newpath prefix or write permission on the newpath parent directory is
		    denied.

       EFAULT	    oldpath or newpath is a NULL pointer.

       EEXIST	    newpath already exists.

       ENOTDIR	    A component of the newpath prefix is not a directory.

       ENAMETOOLONG The length of oldpath or newpath exceeds CA_MAXPATHLEN or the length of a path component exceeds CA_MAXNAMELEN.

       SENOSHOST    Host unknown.

       SENOSSERV    Service unknown.

       SECOMERR     Communication error.

       SEOPNOTSUP   Not supported on Windows.

SEE ALSO

       Castor_limits(4), rfio_readlink(3), rfio_unlink(3), Cthread(3)

AUTHOR

       LCG Grid Deployment Team

LCG
							   $Date: 2005/03/31 13:13:03 $ 					   RFIO_SYMLINK(3)