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sio
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SSend.c
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C/C++ Source or Header
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2001-11-19
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4KB
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185 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
SSend(int sfd, char *buf0, size_t size, int fl, int tlen)
{
char *volatile buf = buf0;
send_return_t nwrote;
volatile send_size_t nleft;
alarm_time_t tleft;
vsio_sigproc_t sigalrm, sigpipe;
time_t done, now;
if (SSetjmp(gNetTimeoutJmp) != 0) {
alarm(0);
(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
nwrote = (send_return_t) size - (send_return_t) nleft;
if (nwrote > 0)
return ((int) nwrote);
errno = ETIMEDOUT;
return (kTimeoutErr);
}
if (SSetjmp(gPipeJmp) != 0) {
alarm(0);
(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
nwrote = (send_return_t) size - (send_return_t) nleft;
if (nwrote > 0)
return ((int) nwrote);
errno = EPIPE;
return (kBrokenPipeErr);
}
sigalrm = (vsio_sigproc_t) SSignal(SIGALRM, SIOHandler);
sigpipe = (vsio_sigproc_t) SSignal(SIGPIPE, SIOHandler);
nleft = (send_size_t) size;
time(&now);
done = now + tlen;
forever {
tleft = (done < now) ? ((alarm_time_t) (done - now)) : 0;
if (tleft < 1) {
nwrote = (send_return_t) size - (send_return_t) nleft;
if (nwrote == 0) {
nwrote = kTimeoutErr;
errno = ETIMEDOUT;
}
goto done;
}
(void) alarm(tleft);
nwrote = send(sfd, buf, nleft, fl);
(void) alarm(0);
if (nwrote < 0) {
if (errno != EINTR) {
nwrote = (send_return_t) size - (send_return_t) nleft;
if (nwrote == 0)
nwrote = (send_return_t) -1;
goto done;
} else {
errno = 0;
nwrote = 0;
/* Try again. */
}
}
nleft -= (send_size_t) nwrote;
if (nleft == 0)
break;
buf += nwrote;
time(&now);
}
nwrote = (send_return_t) size - (send_return_t) nleft;
done:
(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);
return ((int) nwrote);
} /* SSend */
#else
int
SSend(int sfd, char *buf0, size_t size, int fl, int tlen)
{
char *buf = buf0;
send_return_t nwrote;
send_size_t nleft;
int tleft;
time_t done, now;
fd_set ss;
struct timeval tv;
int result;
nleft = (send_size_t) size;
time(&now);
done = now + tlen;
forever {
tleft = (int) (done - now);
if (tleft < 1) {
nwrote = (send_return_t) size - (send_return_t) nleft;
if (nwrote == 0) {
nwrote = kTimeoutErr;
errno = ETIMEDOUT;
SETWSATIMEOUTERR
}
goto done;
}
/* Unfortunately this doesn't help when the
* send buffer fills during the time we're
* writing to it, so you could still be
* blocked after breaking this loop and starting
* the write.
*/
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) tlen;
tv.tv_usec = 0;
result = select(sfd + 1, NULL, SELECT_TYPE_ARG234 &ss, NULL, SELECT_TYPE_ARG5 &tv);
if (result == 1) {
/* ready */
break;
} else if (result == 0) {
/* timeout */
nwrote = (send_return_t) size - (send_return_t) nleft;
if (nwrote > 0)
return ((int) nwrote);
errno = ETIMEDOUT;
SETWSATIMEOUTERR
return (kTimeoutErr);
} else if (errno != EINTR) {
return (-1);
}
}
nwrote = send(sfd, buf, nleft, fl);
if (nwrote < 0) {
if (errno != EINTR) {
nwrote = (send_return_t) size - (send_return_t) nleft;
if (nwrote == 0)
nwrote = (send_return_t) -1;
goto done;
} else {
errno = 0;
nwrote = 0;
/* Try again. */
}
}
nleft -= (send_size_t) nwrote;
if (nleft == 0)
break;
buf += nwrote;
time(&now);
}
nwrote = (send_return_t) size - (send_return_t) nleft;
done:
return ((int) nwrote);
} /* SSend */
#endif