source: UsbWattMeter/trunk/curl-7.47.1/lib/select.h@ 167

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1#ifndef HEADER_CURL_SELECT_H
2#define HEADER_CURL_SELECT_H
3/***************************************************************************
4 * _ _ ____ _
5 * Project ___| | | | _ \| |
6 * / __| | | | |_) | |
7 * | (__| |_| | _ <| |___
8 * \___|\___/|_| \_\_____|
9 *
10 * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
11 *
12 * This software is licensed as described in the file COPYING, which
13 * you should have received as part of this distribution. The terms
14 * are also available at https://curl.haxx.se/docs/copyright.html.
15 *
16 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
17 * copies of the Software, and permit persons to whom the Software is
18 * furnished to do so, under the terms of the COPYING file.
19 *
20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21 * KIND, either express or implied.
22 *
23 ***************************************************************************/
24
25#include "curl_setup.h"
26
27#ifdef HAVE_SYS_POLL_H
28#include <sys/poll.h>
29#elif defined(HAVE_POLL_H)
30#include <poll.h>
31#endif
32
33/*
34 * Definition of pollfd struct and constants for platforms lacking them.
35 */
36
37#if !defined(HAVE_STRUCT_POLLFD) && \
38 !defined(HAVE_SYS_POLL_H) && \
39 !defined(HAVE_POLL_H)
40
41#define POLLIN 0x01
42#define POLLPRI 0x02
43#define POLLOUT 0x04
44#define POLLERR 0x08
45#define POLLHUP 0x10
46#define POLLNVAL 0x20
47
48struct pollfd
49{
50 curl_socket_t fd;
51 short events;
52 short revents;
53};
54
55#endif
56
57#ifndef POLLRDNORM
58#define POLLRDNORM POLLIN
59#endif
60
61#ifndef POLLWRNORM
62#define POLLWRNORM POLLOUT
63#endif
64
65#ifndef POLLRDBAND
66#define POLLRDBAND POLLPRI
67#endif
68
69/* there are three CSELECT defines that are defined in the public header that
70 are exposed to users, but this *IN2 bit is only ever used internally and
71 therefore defined here */
72#define CURL_CSELECT_IN2 (CURL_CSELECT_ERR << 1)
73
74int Curl_socket_check(curl_socket_t readfd, curl_socket_t readfd2,
75 curl_socket_t writefd,
76 long timeout_ms);
77
78/* provide the former API internally */
79#define Curl_socket_ready(x,y,z) \
80 Curl_socket_check(x, CURL_SOCKET_BAD, y, z)
81
82int Curl_poll(struct pollfd ufds[], unsigned int nfds, int timeout_ms);
83
84/* On non-DOS and non-Winsock platforms, when Curl_ack_eintr is set,
85 * EINTR condition is honored and function might exit early without
86 * awaiting full timeout. Otherwise EINTR will be ignored and full
87 * timeout will elapse. */
88extern int Curl_ack_eintr;
89
90int Curl_wait_ms(int timeout_ms);
91
92#ifdef TPF
93int tpf_select_libcurl(int maxfds, fd_set* reads, fd_set* writes,
94 fd_set* excepts, struct timeval* tv);
95#endif
96
97/* Winsock and TPF sockets are not in range [0..FD_SETSIZE-1], which
98 unfortunately makes it impossible for us to easily check if they're valid
99*/
100#if defined(USE_WINSOCK) || defined(TPF)
101#define VALID_SOCK(x) 1
102#define VERIFY_SOCK(x) Curl_nop_stmt
103#else
104#define VALID_SOCK(s) (((s) >= 0) && ((s) < FD_SETSIZE))
105#define VERIFY_SOCK(x) do { \
106 if(!VALID_SOCK(x)) { \
107 SET_SOCKERRNO(EINVAL); \
108 return -1; \
109 } \
110} WHILE_FALSE
111#endif
112
113#endif /* HEADER_CURL_SELECT_H */
114
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