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75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
#include "syshdrs.h"
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void
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SelectSetInit(SelectSetPtr const ssp, const double timeout)
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{
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double i;
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long l;
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/* Inititalize SelectSet, which will clear the fd_set, the
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* timeval, and the maxfd and numfds to 0.
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*/
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memset(ssp, 0, sizeof(SelectSet));
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l = (long) timeout;
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i = (double) l;
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ssp->timeout.tv_sec = l;
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ssp->timeout.tv_usec = (long) ((timeout - i) * 1000000.0);
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} /* SelectSetInit */
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void
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SelectSetAdd(SelectSetPtr const ssp, const int fd)
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{
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if (fd >= 0) {
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FD_SET(fd, &ssp->fds);
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if (ssp->maxfd < (fd + 1))
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ssp->maxfd = (fd + 1);
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++ssp->numfds;
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}
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} /* SelectSetAdd */
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void
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SelectSetRemove(SelectSetPtr const ssp, const int fd)
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{
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if ((fd >= 0) && (FD_ISSET(fd, &ssp->fds))) {
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FD_CLR(fd, &ssp->fds);
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/* Note that maxfd is left alone, even if maxfd was
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* this one. That is okay.
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*/
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--ssp->numfds;
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}
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} /* SelectSetRemove */
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int
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SelectW(SelectSetPtr ssp, SelectSetPtr resultssp)
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{
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int rc;
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do {
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memcpy(resultssp, ssp, sizeof(SelectSet));
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rc = select(resultssp->maxfd, NULL, SELECT_TYPE_ARG234 &resultssp->fds, NULL, SELECT_TYPE_ARG5 &resultssp->timeout);
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} while ((rc < 0) && (errno == EINTR));
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return (rc);
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} /* SelectW */
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int
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SelectR(SelectSetPtr ssp, SelectSetPtr resultssp)
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{
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int rc;
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do {
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memcpy(resultssp, ssp, sizeof(SelectSet));
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rc = select(resultssp->maxfd, SELECT_TYPE_ARG234 &resultssp->fds, NULL, NULL, SELECT_TYPE_ARG5 &resultssp->timeout);
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} while ((rc < 0) && (errno == EINTR));
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return (rc);
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} /* SelectR */
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