mirror of https://github.com/macssh/macssh.git
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
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/* jpoll.c
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*
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* This code emulates a minimal poll() function, and can be used as a drop-in
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* replacement for the SVID3 implementation. Note that at this time it only
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* emulates the POLLIN and POLLOUT events.
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*
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* $id:$ */
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/*
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* AUTHOR: Sean Reifschneider <jafo@tummy.com>
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* DATE: 1998-10-10
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* COPYING: Free for unlimited use. No warranty expressed or implied.
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* If it breaks, you get to keep both parts.
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*/
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#include "jpoll.h"
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#include <sys/time.h>
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#include <sys/types.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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int poll(struct pollfd *fdlist, nfds_t count, int timeoutInMS)
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{
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struct timeval timeout, *to;
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fd_set readfdset, writefdset;
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nfds_t i;
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int ret, fdcount = 0;
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int tsize = getdtablesize();
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if (timeoutInMS < 0)
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to = NULL;
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else {
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to = &timeout;
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timeout.tv_sec = timeoutInMS / 1000;
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timeout.tv_usec = (timeoutInMS % 1000) * 1000;
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}
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FD_ZERO(&readfdset);
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FD_ZERO(&writefdset);
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for (i = 0; i < count; i++) {
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if (fdlist[i].fd < 0) continue;
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if (fdlist[i].events & POLLIN) FD_SET(fdlist[i].fd, &readfdset);
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if (fdlist[i].events & POLLOUT) FD_SET(fdlist[i].fd, &writefdset);
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fdcount++;
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}
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/* spec says that if all FDs are negative, then *ONLY* return zero */
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if (fdcount == 0)
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return(0);
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/* clear all events */
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for (i = 0; i < count; i++) fdlist[i].revents = 0;
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if ((ret = select(tsize, &readfdset, &writefdset, NULL, to)) == -1)
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return(-1);
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for (i = 0; i < count; i++) {
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if (FD_ISSET(fdlist[i].fd, &readfdset)) fdlist[i].revents |= POLLIN;
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if (FD_ISSET(fdlist[i].fd, &writefdset)) fdlist[i].revents |= POLLOUT;
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/*trace("jpoll.c: Set FD %i = %i\n", i, fdlist[i].revents);*/
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}
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/*trace("jpoll.c: Returning %i\n", ret);*/
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return(ret);
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}
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