os_support: Don't compare a negative number against socket descriptors
[libav.git] / libavformat / os_support.h
1 /*
2 * various OS-feature replacement utilities
3 * copyright (c) 2000, 2001, 2002 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #ifndef AVFORMAT_OS_SUPPORT_H
23 #define AVFORMAT_OS_SUPPORT_H
24
25 /**
26 * @file
27 * miscellaneous OS support macros and functions.
28 */
29
30 #include "config.h"
31
32 #if defined(__MINGW32__) && !defined(__MINGW32CE__)
33 # include <fcntl.h>
34 # define lseek(f,p,w) _lseeki64((f), (p), (w))
35 # define stat _stati64
36 # define fstat(f,s) _fstati64((f), (s))
37 #endif /* defined(__MINGW32__) && !defined(__MINGW32CE__) */
38
39 static inline int is_dos_path(const char *path)
40 {
41 #if HAVE_DOS_PATHS
42 if (path[0] && path[1] == ':')
43 return 1;
44 #endif
45 return 0;
46 }
47
48 #if defined(__OS2__)
49 #define SHUT_RD 0
50 #define SHUT_WR 1
51 #define SHUT_RDWR 2
52 #endif
53
54 #if defined(_WIN32)
55 #define SHUT_RD SD_RECEIVE
56 #define SHUT_WR SD_SEND
57 #define SHUT_RDWR SD_BOTH
58 #endif
59
60 #if defined(_WIN32) && !defined(__MINGW32CE__)
61 int ff_win32_open(const char *filename, int oflag, int pmode);
62 #define open ff_win32_open
63 #endif
64
65 #if CONFIG_NETWORK
66 #if !HAVE_SOCKLEN_T
67 typedef int socklen_t;
68 #endif
69
70 /* most of the time closing a socket is just closing an fd */
71 #if !HAVE_CLOSESOCKET
72 #define closesocket close
73 #endif
74
75 #if !HAVE_POLL_H
76 typedef unsigned long nfds_t;
77
78 struct pollfd {
79 int fd;
80 short events; /* events to look for */
81 short revents; /* events that occurred */
82 };
83
84 /* events & revents */
85 #define POLLIN 0x0001 /* any readable data available */
86 #define POLLOUT 0x0002 /* file descriptor is writeable */
87 #define POLLRDNORM POLLIN
88 #define POLLWRNORM POLLOUT
89 #define POLLRDBAND 0x0008 /* priority readable data */
90 #define POLLWRBAND 0x0010 /* priority data can be written */
91 #define POLLPRI 0x0020 /* high priority readable data */
92
93 /* revents only */
94 #define POLLERR 0x0004 /* errors pending */
95 #define POLLHUP 0x0080 /* disconnected */
96 #define POLLNVAL 0x1000 /* invalid file descriptor */
97
98
99 int poll(struct pollfd *fds, nfds_t numfds, int timeout);
100 #endif /* HAVE_POLL_H */
101 #endif /* CONFIG_NETWORK */
102
103 #endif /* AVFORMAT_OS_SUPPORT_H */