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