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cb36189692
Ryan C. Gordon We should really stick this in SDL_internal.h or something so it's always available.
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2020 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
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SDL_IOReady(int fd, SDL_bool forWrite, int timeoutMS)
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{
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int result;
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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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{
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#ifdef HAVE_POLL
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struct pollfd info;
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info.fd = fd;
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if (forWrite) {
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info.events = POLLOUT;
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} else {
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info.events = POLLIN | POLLPRI;
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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 (forWrite) {
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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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} else {
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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 (timeoutMS >= 0) {
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tv.tv_sec = timeoutMS / 1000;
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tv.tv_usec = (timeoutMS % 1000) * 1000;
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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 );
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return result;
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}
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/* vi: set ts=4 sw=4 expandtab: */
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