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127 lines
2.5 KiB
C
127 lines
2.5 KiB
C
#include "syshdrs.h"
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#ifndef NO_SIGNALS
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extern volatile Sjmp_buf gNetTimeoutJmp;
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extern volatile Sjmp_buf gPipeJmp;
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#endif
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#ifndef NO_SIGNALS
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int
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SRecvfrom(int sfd, char *const buf, size_t size, int fl, struct sockaddr_in *const fromAddr, int tlen)
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{
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int nread, tleft;
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vsio_sigproc_t sigalrm, sigpipe;
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time_t done, now;
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int alen;
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if (SSetjmp(gNetTimeoutJmp) != 0) {
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alarm(0);
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(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
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(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
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errno = ETIMEDOUT;
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return (kTimeoutErr);
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}
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if (SSetjmp(gPipeJmp) != 0) {
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alarm(0);
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(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
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(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
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errno = EPIPE;
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return (kBrokenPipeErr);
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}
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sigalrm = (vsio_sigproc_t) SSignal(SIGALRM, SIOHandler);
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sigpipe = (vsio_sigproc_t) SSignal(SIGPIPE, SIOHandler);
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time(&now);
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done = now + tlen;
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tleft = (int) (done - now);
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forever {
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alen = sizeof(struct sockaddr_in);
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(void) alarm((unsigned int) tleft);
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nread = recvfrom(sfd, buf, size, fl,
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(struct sockaddr *) fromAddr, &alen);
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(void) alarm(0);
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if (nread >= 0)
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break;
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if (errno != EINTR)
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break; /* Fatal error. */
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errno = 0;
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time(&now);
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tleft = (int) (done - now);
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if (tleft < 1) {
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nread = kTimeoutErr;
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errno = ETIMEDOUT;
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break;
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}
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}
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(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
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(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
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return (nread);
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} /* SRecvfrom */
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#else
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int
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SRecvfrom(int sfd, char *const buf, size_t size, int fl, struct sockaddr_in *const fromAddr, int tlen)
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{
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int nread, tleft;
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fd_set ss;
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struct timeval tv;
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int result;
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time_t done, now;
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int alen;
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time(&now);
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done = now + tlen;
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tleft = (int) (done - now);
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nread = 0;
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forever {
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alen = sizeof(struct sockaddr_in);
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forever {
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errno = 0;
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FD_ZERO(&ss);
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FD_SET(sfd, &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, NULL, SELECT_TYPE_ARG5 &tv);
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if (result == 1) {
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/* ready */
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break;
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} else if (result == 0) {
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/* timeout */
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errno = ETIMEDOUT;
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SETWSATIMEOUTERR
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return (kTimeoutErr);
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} else if (errno != EINTR) {
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return (-1);
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}
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}
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nread = recvfrom(sfd, buf, size, fl,
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(struct sockaddr *) fromAddr, &alen);
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if (nread >= 0)
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break;
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if (errno != EINTR)
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break; /* Fatal error. */
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errno = 0;
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time(&now);
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tleft = (int) (done - now);
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if (tleft < 1) {
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nread = kTimeoutErr;
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errno = ETIMEDOUT;
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SETWSATIMEOUTERR
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break;
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}
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}
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return (nread);
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} /* SRecvfrom */
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#endif
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