   #PHP Manual Direct IO functions dio_close dio_open

   PHP Manual
   Prev  Next
   ______________________________________________________________________

                                   dio_fcntl

   (PHP 4 >= 4.2.0)
   dio_fcntl -- Performs a c library fcntl on fd

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.
     * F_SETFL - Sets the file descriptors flags to the value specified
       by arg, which can be O_APPEND,O_NONBLOCK or O_ASYNC. To use
       O_ASYNC you will need to use the PCNTL extension.
   ______________________________________________________________________

   Prev      Home     Next
   dio_close  Up  dio_open
