fpFlock

Lock a file (advisory lock)

Declaration

Source position: unix.pp line 101

function fpFlock(

var T: text;

mode: cint

):cint; function fpFlock(

var F: file;

mode: cint

):cint; function fpFlock(

fd: cint;

mode: cint

):cint;

Description

FpFLock implements file locking. it sets or removes a lock on the file F. F can be of type Text or File, or it can be a Linux filedescriptor (a longint) Mode can be one of the following constants :

LOCK_SH: sets a shared lock.
LOCK_EX: sets an exclusive lock.
LOCK_UN: unlocks the file.
LOCK_NB: This can be OR-ed together with the other. If this is done the application doesn't block when locking.

The function returns zero if successful, a nonzero return value indicates an error.

Errors

Extended error information is returned by the FpGetErrno function:

#rtl.baseunix.FpFcntl		File control operations.
FSync		Synchronize file's kernel data with disk.

fpFlock

Declaration

Description

Errors

See also