usendto.c

来自「这是一个开放源代码的与WINNT/WIN2K/WIN2003兼容的操作系统」· C语言 代码 · 共 64 行

#include "syshdrs.h"

#if !defined(NO_UNIX_DOMAIN_SOCKETS) && !defined(NO_SIGNALS)

extern volatile Sjmp_buf gNetTimeoutJmp;
extern volatile Sjmp_buf gPipeJmp;

int
USendto(int sfd, const char *const buf, size_t size, int fl, const struct sockaddr_un *const toAddr, int ualen, int tlen)
{
	int nwrote, 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);
		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 = (int) (done - now);
	forever {
		(void) alarm((unsigned int) tleft);
		nwrote = sendto(sfd, buf, size, fl,
			(struct sockaddr *) toAddr, ualen);
		(void) alarm(0);
		if (nwrote >= 0)
			break;
		if (errno != EINTR)
			break;		/* Fatal error. */
		errno = 0;
		time(&now);
		tleft = (int) (done - now);
		if (tleft < 1) {
			nwrote = kTimeoutErr;
			errno = ETIMEDOUT;
			break;
		}
	}

	(void) SSignal(SIGALRM, (sio_sigproc_t) sigalrm);
	(void) SSignal(SIGPIPE, (sio_sigproc_t) sigpipe);

	return (nwrote);
}	/* USendto */

#endif