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