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SRecv.c
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C/C++ Source or Header
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2003-08-31
|
3KB
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113 lines
#include "syshdrs.h"
#ifdef PRAGMA_HDRSTOP
# pragma hdrstop
#endif
int
SRecv(int sfd, char *const buf0, size_t size, int fl, int tlen, int retry)
{
read_return_t nread;
read_size_t nleft;
char *buf = buf0;
int tleft;
time_t done, now;
fd_set ss;
struct timeval tv;
int result, firstRead;
DECL_SIGPIPE_VARS
if ((buf == NULL) || (size == 0) || (tlen <= 0)) {
errno = EINVAL;
return (-1);
}
IGNORE_SIGPIPE
errno = 0;
nleft = (read_size_t) size;
time(&now);
done = now + tlen;
firstRead = 1;
forever {
tleft = (done > now) ? ((int) (done - now)) : 0;
if (tleft < 1) {
nread = (read_return_t) size - (read_return_t) nleft;
if ((nread == 0) || ((retry & (kFullBufferRequired|kFullBufferRequiredExceptLast)) != 0)) {
nread = kTimeoutErr;
errno = ETIMEDOUT;
SETWSATIMEOUTERR
}
goto done;
}
if (!firstRead || ((retry & kNoFirstSelect) == 0)) {
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 */
nread = (read_return_t) size - (read_return_t) nleft;
if ((nread > 0) && ((retry & (kFullBufferRequired|kFullBufferRequiredExceptLast)) == 0)) {
RESTORE_SIGPIPE
return ((int) nread);
}
errno = ETIMEDOUT;
SETWSATIMEOUTERR
RESTORE_SIGPIPE
return (kTimeoutErr);
} else if (errno != EINTR) {
RESTORE_SIGPIPE
return (-1);
}
}
firstRead = 0;
}
nread = recv(sfd, (char *) buf, (recv_size_t) nleft, fl);
if (nread <= 0) {
if (nread == 0) {
/* EOF */
if (retry == ((retry & (kFullBufferRequiredExceptLast)) != 0))
nread = (read_return_t) size - (read_return_t) nleft;
goto done;
} else if (errno != EINTR) {
nread = (read_return_t) size - (read_return_t) nleft;
if (nread == 0)
nread = (read_return_t) -1;
goto done;
} else {
errno = 0;
nread = 0;
/* Try again. */
}
}
nleft -= (read_size_t) nread;
if ((nleft == 0) || (((retry & (kFullBufferRequired|kFullBufferRequiredExceptLast)) == 0) && (nleft != (read_size_t) size)))
break;
buf += nread;
time(&now);
}
nread = (read_return_t) size - (read_return_t) nleft;
done:
RESTORE_SIGPIPE
return ((int) nread);
} /* SRecv */