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