[zbin] Fix check for existence of most recent output byte
[ipxe.git] / src / usr / sync.c
1 /*
2 * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA.
18 */
19
20 FILE_LICENCE ( GPL2_OR_LATER );
21
22 #include <stddef.h>
23 #include <ipxe/job.h>
24 #include <ipxe/monojob.h>
25 #include <ipxe/pending.h>
26 #include <usr/sync.h>
27
28 /** @file
29 *
30 * Wait for pending operations to complete
31 *
32 */
33
34 /**
35 * Report progress
36 *
37 * @v intf Interface
38 * @v progress Progress report to fill in
39 * @ret ongoing_rc Ongoing job status code (if known)
40 */
41 static int sync_progress ( struct interface *intf,
42 struct job_progress *progress __unused ) {
43
44 /* Terminate successfully if no pending operations remain */
45 if ( ! have_pending() )
46 intf_close ( intf, 0 );
47
48 return 0;
49 }
50
51 /** Synchroniser interface operations */
52 static struct interface_operation sync_intf_op[] = {
53 INTF_OP ( job_progress, struct interface *, sync_progress ),
54 };
55
56 /** Synchroniser interface descriptor */
57 static struct interface_descriptor sync_intf_desc =
58 INTF_DESC_PURE ( sync_intf_op );
59
60 /** Synchroniser */
61 static struct interface sync_intf = INTF_INIT ( sync_intf_desc );
62
63 /**
64 * Wait for pending operations to complete
65 *
66 * @v timeout Timeout period, in ticks (0=indefinite)
67 * @ret rc Return status code
68 */
69 int sync ( unsigned long timeout ) {
70
71 /* Attach synchroniser and wait for completion */
72 intf_plug_plug ( &monojob, &sync_intf );
73 return monojob_wait ( NULL, timeout );
74 }