| /* io_getevents.c |
| libaio Linux async I/O interface |
| Copyright 2002 Red Hat, Inc. |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include <libaio.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <time.h> |
| #include "syscall.h" |
| |
| io_syscall5(int, __io_getevents_0_4, io_getevents, io_context_t, ctx, long, min_nr, long, nr, struct io_event *, events, struct timespec *, timeout) |
| |
| #define AIO_RING_MAGIC 0xa10a10a1 |
| |
| /* Ben will hate me for this */ |
| struct aio_ring { |
| unsigned id; /* kernel internal index number */ |
| unsigned nr; /* number of io_events */ |
| unsigned head; |
| unsigned tail; |
| |
| unsigned magic; |
| unsigned compat_features; |
| unsigned incompat_features; |
| unsigned header_length; /* size of aio_ring */ |
| }; |
| |
| int io_getevents_0_4(io_context_t ctx, long min_nr, long nr, struct io_event * events, struct timespec * timeout) |
| { |
| struct aio_ring *ring; |
| ring = (struct aio_ring*)ctx; |
| if (ring==NULL || ring->magic != AIO_RING_MAGIC) |
| goto do_syscall; |
| if (timeout!=NULL && timeout->tv_sec == 0 && timeout->tv_nsec == 0) { |
| if (ring->head == ring->tail) |
| return 0; |
| } |
| |
| do_syscall: |
| return __io_getevents_0_4(ctx, min_nr, nr, events, timeout); |
| } |
| |
| DEFSYMVER(io_getevents_0_4, io_getevents, 0.4) |