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96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
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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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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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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 be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#include "SDL_poll.h"
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#ifdef HAVE_POLL
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#include <poll.h>
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#else
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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#include <errno.h>
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int SDL_IOReady(int fd, int flags, Sint64 timeoutNS)
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{
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int result;
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SDL_assert(flags & (SDL_IOR_READ | SDL_IOR_WRITE));
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// Note: We don't bother to account for elapsed time if we get EINTR
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do {
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#ifdef HAVE_POLL
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struct pollfd info;
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int timeoutMS;
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info.fd = fd;
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info.events = 0;
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if (flags & SDL_IOR_READ) {
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info.events |= POLLIN | POLLPRI;
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}
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if (flags & SDL_IOR_WRITE) {
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info.events |= POLLOUT;
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}
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// FIXME: Add support for ppoll() for nanosecond precision
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if (timeoutNS > 0) {
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timeoutMS = (int)SDL_NS_TO_MS(timeoutNS + (SDL_NS_PER_MS - 1));
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} else if (timeoutNS == 0) {
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timeoutMS = 0;
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} else {
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timeoutMS = -1;
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}
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result = poll(&info, 1, timeoutMS);
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#else
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fd_set rfdset, *rfdp = NULL;
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fd_set wfdset, *wfdp = NULL;
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struct timeval tv, *tvp = NULL;
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// If this assert triggers we'll corrupt memory here
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SDL_assert(fd >= 0 && fd < FD_SETSIZE);
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if (flags & SDL_IOR_READ) {
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FD_ZERO(&rfdset);
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FD_SET(fd, &rfdset);
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rfdp = &rfdset;
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}
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if (flags & SDL_IOR_WRITE) {
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FD_ZERO(&wfdset);
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FD_SET(fd, &wfdset);
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wfdp = &wfdset;
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}
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if (timeoutNS >= 0) {
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tv.tv_sec = (timeoutNS / SDL_NS_PER_SECOND);
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tv.tv_usec = SDL_NS_TO_US((timeoutNS % SDL_NS_PER_SECOND) + (SDL_NS_PER_US - 1));
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tvp = &tv;
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}
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result = select(fd + 1, rfdp, wfdp, NULL, tvp);
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#endif // HAVE_POLL
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} while (result < 0 && errno == EINTR && !(flags & SDL_IOR_NO_RETRY));
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return result;
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}
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