source: trunk/packages/xen-3.1/xen-3.1/tools/vnet/vnetd/select.h @ 34

Last change on this file since 34 was 34, checked in by hartmans, 18 years ago

Add xen and xen-common

File size: 2.0 KB
Line 
1/*
2 * Copyright (C) 2003 - 2004 Mike Wray <mike.wray@hp.com>.
3 *
4 * This library is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License as
6 * published by the Free Software Foundation; either version 2.1 of the
7 * License, or  (at your option) any later version. This library is
8 * distributed in the  hope that it will be useful, but WITHOUT ANY
9 * WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE.
11 * See the GNU Lesser General Public License for more details.
12 *
13 * You should have received a copy of the GNU Lesser General Public License
14 * along with this library; if not, write to the Free Software Foundation,
15 * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
16 */
17#ifndef _VFC_SELECT_H_
18#define _VFC_SELECT_H_
19
20/** Set of file descriptors for select.
21 */
22typedef struct SelectSet {
23    int n;
24    fd_set rd, wr, er;
25} SelectSet;
26
27enum {
28    SELECT_READ  = 1,
29    SELECT_WRITE = 2,
30    SELECT_ERROR = 4,
31};
32
33extern void SelectSet_zero(SelectSet *set);
34extern void SelectSet_add(SelectSet *set, int fd, int mode);
35extern void SelectSet_add_read(SelectSet *set, int fd);
36extern void SelectSet_add_write(SelectSet *set, int fd);
37extern void SelectSet_add_error(SelectSet *set, int fd);
38extern int SelectSet_select(SelectSet *set, struct timeval *timeout);
39
40static inline int SelectSet_in(SelectSet *set, int fd){
41    return ((fd >= 0)
42            ? ((FD_ISSET(fd, &set->rd) ? SELECT_READ : 0) |
43               (FD_ISSET(fd, &set->wr) ? SELECT_WRITE : 0) |
44               (FD_ISSET(fd, &set->er) ? SELECT_ERROR : 0))
45            : 0);
46}
47
48static inline int SelectSet_in_read(SelectSet *set, int fd){
49    return (fd >= 0) && FD_ISSET(fd, &set->rd);
50}
51
52static inline int SelectSet_in_write(SelectSet *set, int fd){
53    return (fd >= 0) && FD_ISSET(fd, &set->wr);
54}
55
56static inline int SelectSet_in_err(SelectSet *set, int fd){
57    return (fd >= 0) && FD_ISSET(fd, &set->er);
58}
59
60#endif /* ! _VFC_SELECT_H_ */
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