/ncftp-3.2.5/sio/SRecvmsg.c

  1#include "syshdrs.h"
  2#ifdef PRAGMA_HDRSTOP
  3#	pragma hdrstop
  4#endif
  5
  6#ifndef HAVE_RECVMSG
  7int
  8SRecvmsg(int UNUSED(sfd), void *const UNUSED(msg), int UNUSED(fl), int UNUSED(tlen))
  9{
 10	LIBSIO_USE_VAR(sfd);
 11	LIBSIO_USE_VAR(msg);
 12	LIBSIO_USE_VAR(fl);
 13	LIBSIO_USE_VAR(tlen);
 14#	ifdef ENOSYS
 15	errno = ENOSYS;
 16#	endif
 17	return (-1);
 18}
 19
 20
 21#else
 22
 23int
 24SRecvmsg(int sfd, void *const msg, int fl, int tlen)
 25{
 26	recv_return_t nread;
 27	int tleft;
 28	time_t done, now;
 29	fd_set ss;
 30	struct timeval tv;
 31	int result;
 32	DECL_SIGPIPE_VARS
 33	
 34	if (msg == NULL) {
 35		errno = EINVAL;
 36		return (-1);
 37	}
 38	
 39	if (tlen <= 0) {
 40		errno = 0;
 41		for (;;) {
 42			nread = recvmsg(sfd, (struct msghdr *) msg, fl);
 43			if ((nread >= 0) || (errno != EINTR))
 44				return ((int) nread);
 45		}
 46	}
 47
 48	time(&now);
 49	done = now + tlen;
 50	tleft = (done > now) ? ((int) (done - now)) : 0;
 51	forever {
 52				
 53		for (;;) {
 54			errno = 0;
 55			MY_FD_ZERO(&ss);
 56#if defined(__DECC) || defined(__DECCXX)
 57#pragma message save
 58#pragma message disable trunclongint
 59#endif
 60			MY_FD_SET(sfd, &ss);
 61#if defined(__DECC) || defined(__DECCXX)
 62#pragma message restore
 63#endif
 64			tv.tv_sec = (tv_sec_t) tleft;
 65			tv.tv_usec = 0;
 66			result = select(sfd + 1, SELECT_TYPE_ARG234 &ss, NULL, NULL, SELECT_TYPE_ARG5 &tv);
 67			if (result >= 1) {
 68				/* ready */
 69				break;
 70			} else if (result == 0) {
 71				/* timeout */
 72				errno = ETIMEDOUT;
 73				SETWSATIMEOUTERR
 74				return (kTimeoutErr);
 75			} else if (errno != EINTR) {
 76				return (-1);
 77			}
 78		}
 79
 80		IGNORE_SIGPIPE
 81		nread = recvmsg(sfd, (struct msghdr *) msg, fl);
 82		RESTORE_SIGPIPE
 83
 84		if (nread >= 0)
 85			break;
 86		if (errno != EINTR)
 87			break;		/* Fatal error. */
 88		errno = 0;
 89		time(&now);
 90		tleft = (done > now) ? ((int) (done - now)) : 0;
 91		if (tleft < 1) {
 92			nread = kTimeoutErr;
 93			errno = ETIMEDOUT;
 94			SETWSATIMEOUTERR
 95			break;
 96		}
 97	}
 98
 99	return ((int) nread);
100}	/* SRecvmsg */
101
102#endif