Atlas - SDL_poll.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21
22#include "../../SDL_internal.h"
23
24#include "SDL_assert.h"
25#include "SDL_poll.h"
26
27#ifdef HAVE_POLL
28#include <poll.h>
29#else
30#include <sys/time.h>
31#include <sys/types.h>
32#include <unistd.h>
33#endif
34#include <errno.h>
35
36
37int
38SDL_IOReady(int fd, SDL_bool forWrite, int timeoutMS)
39{
40    int result;
41
42    /* Note: We don't bother to account for elapsed time if we get EINTR */
43    do
44    {
45#ifdef HAVE_POLL
46        struct pollfd info;
47
48        info.fd = fd;
49        if (forWrite) {
50            info.events = POLLOUT;
51        } else {
52            info.events = POLLIN | POLLPRI;
53        }
54        result = poll(&info, 1, timeoutMS);
55#else
56        fd_set rfdset, *rfdp = NULL;
57        fd_set wfdset, *wfdp = NULL;
58        struct timeval tv, *tvp = NULL;
59
60        /* If this assert triggers we'll corrupt memory here */
61        SDL_assert(fd >= 0 && fd < FD_SETSIZE);
62
63        if (forWrite) {
64            FD_ZERO(&wfdset);
65            FD_SET(fd, &wfdset);
66            wfdp = &wfdset;
67        } else {
68            FD_ZERO(&rfdset);
69            FD_SET(fd, &rfdset);
70            rfdp = &rfdset;
71        }
72
73        if (timeoutMS >= 0) {
74            tv.tv_sec = timeoutMS / 1000;
75            tv.tv_usec = (timeoutMS % 1000) * 1000;
76            tvp = &tv;
77        }
78
79        result = select(fd + 1, rfdp, wfdp, NULL, tvp);
80#endif /* HAVE_POLL */
81
82    } while ( result < 0 && errno == EINTR );
83
84    return result;
85}
86
87/* vi: set ts=4 sw=4 expandtab: */
88
[FILE END]
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