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1//========================================================================
2// GLFW 3.5 POSIX - www.glfw.org
3//------------------------------------------------------------------------
4// Copyright (c) 2022 Camilla Löwy <[email protected]>
5//
6// This software is provided 'as-is', without any express or implied
7// warranty. In no event will the authors be held liable for any damages
8// arising from the use of this software.
9//
10// Permission is granted to anyone to use this software for any purpose,
11// including commercial applications, and to alter it and redistribute it
12// freely, subject to the following restrictions:
13//
14// 1. The origin of this software must not be misrepresented; you must not
15//    claim that you wrote the original software. If you use this software
16//    in a product, an acknowledgment in the product documentation would
17//    be appreciated but is not required.
18//
19// 2. Altered source versions must be plainly marked as such, and must not
20//    be misrepresented as being the original software.
21//
22// 3. This notice may not be removed or altered from any source
23//    distribution.
24//
25//========================================================================
26
27#define _GNU_SOURCE
28
29#include "internal.h"
30
31#if defined(GLFW_BUILD_POSIX_POLL)
32
33#include <signal.h>
34#include <time.h>
35#include <errno.h>
36
37GLFWbool _glfwPollPOSIX(struct pollfd* fds, nfds_t count, double* timeout)
38{
39    for (;;)
40    {
41        if (timeout)
42        {
43            const uint64_t base = _glfwPlatformGetTimerValue();
44
45#if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__CYGWIN__)
46            const time_t seconds = (time_t) *timeout;
47            const long nanoseconds = (long) ((*timeout - seconds) * 1e9);
48            const struct timespec ts = { seconds, nanoseconds };
49            const int result = ppoll(fds, count, &ts, NULL);
50#elif defined(__NetBSD__)
51            const time_t seconds = (time_t) *timeout;
52            const long nanoseconds = (long) ((*timeout - seconds) * 1e9);
53            const struct timespec ts = { seconds, nanoseconds };
54            const int result = pollts(fds, count, &ts, NULL);
55#else
56            const int milliseconds = (int) (*timeout * 1e3);
57            const int result = poll(fds, count, milliseconds);
58#endif
59            const int error = errno; // clock_gettime may overwrite our error
60
61            *timeout -= (_glfwPlatformGetTimerValue() - base) /
62                (double) _glfwPlatformGetTimerFrequency();
63
64            if (result > 0)
65                return GLFW_TRUE;
66            else if (result == -1 && error != EINTR && error != EAGAIN)
67                return GLFW_FALSE;
68            else if (*timeout <= 0.0)
69                return GLFW_FALSE;
70        }
71        else
72        {
73            const int result = poll(fds, count, -1);
74            if (result > 0)
75                return GLFW_TRUE;
76            else if (result == -1 && errno != EINTR && errno != EAGAIN)
77                return GLFW_FALSE;
78        }
79    }
80}
81
82#endif // GLFW_BUILD_POSIX_POLL
83
84
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