60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
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/* This work is copyrighted. See COPYRIGHT.OLD & COPYRIGHT.NEW for *
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* details. If they are missing then this copy is in violation of *
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* the copyright conditions. */
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/*
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** lib_twait.c
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**
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** The routine timed_wait().
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**
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*/
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#include <string.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include "curses.priv.h"
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int timed_wait(int fd, int wait, int *timeleft)
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{
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int result;
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struct timeval timeout;
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static fd_set set;
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#ifndef GOOD_SELECT
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struct timeval starttime, returntime;
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gettimeofday(&starttime, NULL);
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#endif
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FD_ZERO(&set);
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FD_SET(fd, &set);
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/* the units of wait are milliseconds */
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timeout.tv_sec = wait / 1000;
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timeout.tv_usec = (wait % 1000) * 1000;
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T(("start twait: sec = %d, usec = %d", timeout.tv_sec, timeout.tv_usec));
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result = select(fd+1, &set, NULL, NULL, &timeout);
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#ifndef GOOD_SELECT
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gettimeofday(&returntime, NULL);
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timeout.tv_sec -= (returntime.tv_sec - starttime.tv_sec);
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timeout.tv_usec -= (returntime.tv_usec - starttime.tv_usec);
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if (timeout.tv_usec < 0 && timeout.tv_sec > 0) {
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timeout.tv_sec--;
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timeout.tv_usec += 1000000;
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}
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if (timeout.tv_sec < 0)
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timeout.tv_sec = timeout.tv_usec = 0;
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#endif
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/* return approximate time left on the timeout, in milliseconds */
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if (timeleft)
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*timeleft = (timeout.tv_sec * 1000) + (timeout.tv_usec / 1000);
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T(("end twait: returned %d, sec = %d, usec = %d (%d msec)",
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result, timeout.tv_sec, timeout.tv_usec, *timeleft));
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return(result);
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}
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