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SRecvmsg.c
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C/C++ Source or Header
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2009-12-17
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2KB
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103 lines
#include "syshdrs.h"
#ifdef PRAGMA_HDRSTOP
# pragma hdrstop
#endif
#ifndef HAVE_RECVMSG
int
SRecvmsg(int UNUSED(sfd), void *const UNUSED(msg), int UNUSED(fl), int UNUSED(tlen))
{
LIBSIO_USE_VAR(sfd);
LIBSIO_USE_VAR(msg);
LIBSIO_USE_VAR(fl);
LIBSIO_USE_VAR(tlen);
# ifdef ENOSYS
errno = ENOSYS;
# endif
return (-1);
}
#else
int
SRecvmsg(int sfd, void *const msg, int fl, int tlen)
{
recv_return_t nread;
int tleft;
time_t done, now;
fd_set ss;
struct timeval tv;
int result;
DECL_SIGPIPE_VARS
if (msg == NULL) {
errno = EINVAL;
return (-1);
}
if (tlen <= 0) {
errno = 0;
for (;;) {
nread = recvmsg(sfd, (struct msghdr *) msg, fl);
if ((nread >= 0) || (errno != EINTR))
return ((int) nread);
}
}
time(&now);
done = now + tlen;
tleft = (done > now) ? ((int) (done - now)) : 0;
forever {
for (;;) {
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);
}
}
IGNORE_SIGPIPE
nread = recvmsg(sfd, (struct msghdr *) msg, fl);
RESTORE_SIGPIPE
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);
} /* SRecvmsg */
#endif