Description
mixed
dio_fcntl ( resource fd, int cmd [, mixed arg])
The dio_fcntl() function performs the
operation specified by cmd on the file
descriptor fd. Some commands require
additional arguments args to be supplied.
arg is an associative array, when
cmd is F_SETLK or F_SETLLW, with the
following keys:
"start" - offset where lock begins
"length" - size of locked area. zero means to end of file
"wenth" - Where l_start is relative to: can be SEEK_SET,
SEEK_END and SEEK_CUR
"type" - type of lock: can be F_RDLCK (read lock), F_WRLCK
(write lock) or F_UNLCK (unlock)
cmd can be one of the following
operations:
F_SETLK - Lock is set or cleared. If the lock
is held by someone else dio_fcntl() returns
-1.
F_SETLKW - like F_SETLK, but in case the lock
is held by someone else, dio_fcntl() waits
until the lock is released.
F_GETLK - dio_fcntl() returns an
associative array (as described above) if someone else
prevents lock. If there is no obstruction key "type" will set
to F_UNLCK.
F_DUPFD - finds the lowest numbered available file descriptor
greater or equal than arg and returns
them.
