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sio
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SRecvfrom.c
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C/C++ Source or Header
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2001-11-19
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3KB
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140 lines
#include "syshdrs.h"
#ifdef PRAGMA_HDRSTOP
# pragma hdrstop
#endif
#ifndef NO_SIGNALS
extern Sjmp_buf gNetTimeoutJmp;
extern Sjmp_buf gPipeJmp;
#endif
#ifndef NO_SIGNALS
int
SRecvfrom(int sfd, char *const buf, size_t size, int fl, struct sockaddr_in *const fromAddr, int tlen)
{
recv_return_t nread;
alarm_time_t tleft;
vsio_sigproc_t sigalrm, sigpipe;
time_t done, now;
sockaddr_size_t alen;
if (SSetjmp(gNetTimeoutJmp) != 0) {
alarm(0);
(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
errno = ETIMEDOUT;
return (kTimeoutErr);
}
if (SSetjmp(gPipeJmp) != 0) {
alarm(0);
(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
errno = EPIPE;
return (kBrokenPipeErr);
}
sigalrm = (vsio_sigproc_t) SSignal(SIGALRM, SIOHandler);
sigpipe = (vsio_sigproc_t) SSignal(SIGPIPE, SIOHandler);
time(&now);
done = now + tlen;
tleft = (done < now) ? ((alarm_time_t) (done - now)) : 0;
forever {
if (tleft < 1) {
nread = kTimeoutErr;
errno = ETIMEDOUT;
break;
}
alen = (sockaddr_size_t) sizeof(struct sockaddr_in);
(void) alarm(tleft);
nread = recvfrom(sfd, buf, (recv_size_t) size, fl,
(struct sockaddr *) fromAddr, &alen);
(void) alarm(0);
if (nread >= 0)
break;
if (errno != EINTR)
break; /* Fatal error. */
errno = 0;
time(&now);
tleft = (done < now) ? ((alarm_time_t) (done - now)) : 0;
}
(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
return ((int) nread);
} /* SRecvfrom */
#else
int
SRecvfrom(int sfd, char *const buf, size_t size, int fl, struct sockaddr_in *const fromAddr, int tlen)
{
recv_return_t nread;
int tleft;
fd_set ss;
struct timeval tv;
int result;
time_t done, now;
sockaddr_size_t alen;
time(&now);
done = now + tlen;
tleft = (done < now) ? ((int) (done - now)) : 0;
nread = 0;
forever {
alen = (sockaddr_size_t) sizeof(struct sockaddr_in);
forever {
errno = 0;
MY_FD_ZERO(&ss);
#if defined(__DECC) || defined(__DECCXX)
#pragma message save
#pragma message disable trunclongint
#endif
MY_FD_SET(sfd, &ss);
#if defined(__DECC) || defined(__DECCXX)
#pragma message restore
#endif
tv.tv_sec = (tv_sec_t) tleft;
tv.tv_usec = 0;
result = select(sfd + 1, SELECT_TYPE_ARG234 &ss, NULL, NULL, SELECT_TYPE_ARG5 &tv);
if (result == 1) {
/* ready */
break;
} else if (result == 0) {
/* timeout */
errno = ETIMEDOUT;
SETWSATIMEOUTERR
return (kTimeoutErr);
} else if (errno != EINTR) {
return (-1);
}
}
nread = recvfrom(sfd, buf, (recv_size_t) size, fl,
(struct sockaddr *) fromAddr, &alen);
if (nread >= 0)
break;
if (errno != EINTR)
break; /* Fatal error. */
errno = 0;
time(&now);
tleft = (done < now) ? ((int) (done - now)) : 0;
if (tleft < 1) {
nread = kTimeoutErr;
errno = ETIMEDOUT;
SETWSATIMEOUTERR
break;
}
}
return ((int) nread);
} /* SRecvfrom */
#endif