RFIO_LOCKF

Section: Rfio Library Functions (3)
Updated: $Date: 2005/03/31 13:13:03 $
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NAME

rfio_lockf - provide record locking on files

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

int rfio_lockf (int sd, int op, long siz);

Under Linux, for large files:
#define _LARGEFILE64_SOURCE
#include <sys/types.h>
#include "rfio_api.h"

int rfio_lockf64 (int sd, int op, off64_t siz);

For large files, under other systems:
#include <sys/types.h>
#include "rfio_api.h"

int rfio_lockf64 (int sd, int op, off64_t siz);

rfio_lockf restricts access to regions of files to the calling process.

sd is the file descriptor returned by a previous rfio_open.

op specifies the action to be taken:

siz gives the size of the region to be locked, starting at the current file offset.

rfio_lockf64 must be used for large files and uses an off64_t instead of a long to specify the size of the region to be locked.

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

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