/* $Id$ */

FIXME: Check and tidy it up first!


#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/poll.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <errno.h>


int main(int argc,char **argv)
{
int fdunix,fdpipe;
struct sockaddr_un sockaddr_unix;
const char *pathnameunix,*pathnamepipe;
struct pollfd pollfds[2];
int fdi,fdo;

	if (argc!=3) {
		fprintf(stderr,"%s: <pathname UNIX socket> <pathname PIPE>\n",argv[0]);
		exit(EXIT_FAILURE);
		}
	pathnameunix=argv[1];
	pathnamepipe=argv[2];
	if (unlink(pathnamepipe) && errno!=ENOENT) {
		fprintf(stderr,"unlink(\"%s\"): %m\n",pathnamepipe);
		exit(EXIT_FAILURE);
		}
	if (mkfifo(pathnamepipe,0600)) {
		fprintf(stderr,"mkfifo(\"%s\",0600): %m\n",pathnamepipe);
		exit(EXIT_FAILURE);
		}
	if (-1==(fdpipe=open(pathnamepipe,O_WRONLY))) {
		fprintf(stderr,"open(\"%s\",O_WRONLY)=%d: %m\n",pathnamepipe,fdpipe);
		exit(EXIT_FAILURE);
		}
	if (-1==(fdunix=socket(PF_UNIX,SOCK_STREAM,0))) {
		fprintf(stderr,"socket(PF_UNIX,SOCK_STREAM,0)=%d: %m\n",fdunix);
		exit(EXIT_FAILURE);
		}
	memset(&sockaddr_unix,0,sizeof(sockaddr_unix));
	sockaddr_unix.sun_family=AF_UNIX;
	strncpy(sockaddr_unix.sun_path,pathnameunix,sizeof(sockaddr_unix.sun_path));
	if (connect(fdunix,(const struct sockaddr *)&sockaddr_unix,sizeof(sockaddr_unix))) {
		fprintf(stderr,"connect(UNIX socket,\"%s\"): %m\n",pathnameunix);
		exit(EXIT_FAILURE);
		}
	for (;;) {
		pollfds[0].fd=fdunix;
		pollfds[0].events=POLLIN;
		pollfds[1].fd=fdpipe;
		pollfds[1].events=POLLIN;
		if (0>=poll(pollfds,sizeof(pollfds)/sizeof(*pollfds),-1)) {
			fprintf(stderr,"poll(UNIX socket,PIPE socket): %m\n");
			exit(EXIT_FAILURE);
			}
		if (pollfds[0].revents & (POLLERR|POLLHUP|POLLNVAL)) {
			fprintf(stderr,"poll(UNIX socket): revents=0x%X\n",(unsigned)pollfds[0].revents);
			exit(EXIT_FAILURE);
			}
		if (pollfds[1].revents & (POLLERR|POLLHUP|POLLNVAL)) {
			fprintf(stderr,"poll(PIPE socket): revents=0x%X\n",(unsigned)pollfds[1].revents);
			exit(EXIT_FAILURE);
			}
		for (fdi=0;fdi<1 /*sizeof(pollfds)/sizeof(*pollfds)*/;fdi++) {
			for (;;) {
				ssize_t got;
				char buf[0x1000];

				if (fcntl(pollfds[fdi].fd,F_SETFL,O_NONBLOCK)) {
					fprintf(stderr,"fcntl(%s socket,F_SETFL,O_NONBLOCK): %m\n",
							(fdi==0 ? "UNIX" : (fdi==1 ? "PIPE" : "<UNKNOWN>")));
					exit(EXIT_FAILURE);
					}
				got=read(pollfds[fdi].fd,buf,sizeof(buf));
				if (got<0) {
					if (errno==EAGAIN)
						break;
					fprintf(stderr,"read(%s socket): %m\n",
							(fdi==0 ? "UNIX" : (fdi==1 ? "PIPE" : "<UNKNOWN>")));
					exit(EXIT_FAILURE);
					}
				if (got==0)
					exit(EXIT_SUCCESS);
write(1,buf,got);
				for (fdo=0;fdo<sizeof(pollfds)/sizeof(*pollfds);fdo++) {
					if (fdi==fdo)
						continue;
					if (fcntl(pollfds[fdo].fd,F_SETFL,0 /* !O_NONBLOCK */)) {
						fprintf(stderr,"fcntl(%s socket,F_SETFL,0 /* !O_NONBLOCK */): %m\n",
								(fdi==0 ? "UNIX" : (fdi==1 ? "PIPE" : "<UNKNOWN>")));
						exit(EXIT_FAILURE);
						}
					if (got!=write(pollfds[fdo].fd,buf,got)) {
						fprintf(stderr,"write(%s socket,%ld): %m\n",
								(fdo==0 ? "UNIX" : (fdo==1 ? "PIPE" : "<UNKNOWN>")),
								(long)got);
						exit(EXIT_FAILURE);
						}
					}
				}
			}
		}
	return EXIT_SUCCESS;
}