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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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#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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