mirror of https://github.com/axmolengine/axmol.git
86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
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//========================================================================
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// GLFW 3.4 POSIX - www.glfw.org
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//------------------------------------------------------------------------
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// Copyright (c) 2022 Camilla Löwy <elmindreda@glfw.org>
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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// It is fine to use C99 in this file because it will not be built with VS
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//========================================================================
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#define _GNU_SOURCE
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#include "internal.h"
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#if defined(GLFW_BUILD_POSIX_POLL)
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#include <signal.h>
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#include <time.h>
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#include <errno.h>
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GLFWbool _glfwPollPOSIX(struct pollfd* fds, nfds_t count, double* timeout)
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{
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for (;;)
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{
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if (timeout)
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{
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const uint64_t base = _glfwPlatformGetTimerValue();
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#if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__CYGWIN__)
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const time_t seconds = (time_t) *timeout;
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const long nanoseconds = (long) ((*timeout - seconds) * 1e9);
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const struct timespec ts = { seconds, nanoseconds };
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const int result = ppoll(fds, count, &ts, NULL);
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#elif defined(__NetBSD__)
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const time_t seconds = (time_t) *timeout;
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const long nanoseconds = (long) ((*timeout - seconds) * 1e9);
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const struct timespec ts = { seconds, nanoseconds };
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const int result = pollts(fds, count, &ts, NULL);
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#else
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const int milliseconds = (int) (*timeout * 1e3);
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const int result = poll(fds, count, milliseconds);
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#endif
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const int error = errno; // clock_gettime may overwrite our error
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*timeout -= (_glfwPlatformGetTimerValue() - base) /
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(double) _glfwPlatformGetTimerFrequency();
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if (result > 0)
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return GLFW_TRUE;
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else if (result == -1 && error != EINTR && error != EAGAIN)
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return GLFW_FALSE;
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else if (*timeout <= 0.0)
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return GLFW_FALSE;
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}
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else
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{
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const int result = poll(fds, count, -1);
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if (result > 0)
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return GLFW_TRUE;
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else if (result == -1 && errno != EINTR && errno != EAGAIN)
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return GLFW_FALSE;
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}
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}
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}
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#endif // GLFW_BUILD_POSIX_POLL
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