rfio_lockf(3)

Usage

#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.

`EBADF`	sd is not a valid descriptor.
`EACCES`	The file region is locked and F_TEST or F_TLOCK was specified.
`EINVAL`	incorrect value for op or siz.
`SENOSHOST`	Host unknown.
`SENOSSERV`	Service unknown.
`SETIMEDOUT`	Timed out.
`SECONNDROP`	Connection closed by remote end.
`SECOMERR`	Communication error.

Unchanged in 5 releases since Debian 6.0 (Squeeze).