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109 lines
1.8 KiB
C
109 lines
1.8 KiB
C
#include "syshdrs.h"
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/*
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* Return zero if the operation timed-out or erred-out, otherwise non-zero.
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*/
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int
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SWaitUntilReadyForReading(const int sfd, const int tlen)
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{
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fd_set ss, ss2;
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struct timeval tv;
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int result;
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int tleft;
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time_t now, done;
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if (sfd < 0) {
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errno = EBADF;
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return (0);
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}
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time(&now);
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done = now + tlen;
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tleft = tlen;
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forever {
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FD_ZERO(&ss);
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FD_SET(sfd, &ss);
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ss2 = ss;
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tv.tv_sec = tleft;
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tv.tv_usec = 0;
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result = select(sfd + 1, SELECT_TYPE_ARG234 &ss, NULL, SELECT_TYPE_ARG234 &ss2, &tv);
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if (result == 1) {
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/* ready */
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return (1);
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} else if (result < 0) {
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if (errno != EINTR) {
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/* error */
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return (0);
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}
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/* try again */
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time(&now);
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if (now > done) {
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/* timed-out */
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errno = ETIMEDOUT;
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return (0);
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}
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tleft = (int) (done - now);
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} else {
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/* timed-out */
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errno = ETIMEDOUT;
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return (0);
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}
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}
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} /* SWaitUntilReadyForReading */
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/*
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* Return zero if the operation timed-out or erred-out, otherwise non-zero.
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*/
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int
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SWaitUntilReadyForWriting(const int sfd, const int tlen)
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{
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fd_set ss, ss2;
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struct timeval tv;
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int result;
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int tleft;
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time_t now, done;
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if (sfd < 0) {
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errno = EBADF;
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return (0);
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}
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time(&now);
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done = now + tlen;
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tleft = tlen;
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forever {
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FD_ZERO(&ss);
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FD_SET(sfd, &ss);
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ss2 = ss;
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tv.tv_sec = tleft;
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tv.tv_usec = 0;
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result = select(sfd + 1, NULL, SELECT_TYPE_ARG234 &ss, SELECT_TYPE_ARG234 &ss2, &tv);
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if (result == 1) {
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/* ready */
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return (1);
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} else if (result < 0) {
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if (errno != EINTR) {
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/* error */
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return (0);
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}
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/* try again */
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time(&now);
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if (now > done) {
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/* timed-out */
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errno = ETIMEDOUT;
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return (0);
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}
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tleft = (int) (done - now);
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} else {
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/* timed-out */
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errno = ETIMEDOUT;
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return (0);
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}
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}
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} /* SWaitUntilReadyForWriting */
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