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