/*	FIFO-based server	AUP2, Sec. 7.02.2	Copyright 2003 by Marc J. Rochkind. All rights reserved.	May be copied only for purposes and under conditions described	on the Web page www.basepath.com/aup/copyright.htm.	The Example Files are provided "as is," without any warranty;	without even the implied warranty of merchantability or fitness	for a particular purpose. The author and his publisher are not	responsible for any damages, direct or incidental, resulting	from the use or non-use of these Example Files.	The Example Files may contain defects, and some contain deliberate	coding mistakes that were included for educational reasons.	You are responsible for determining if and how the Example Files	are to be used.*/#include "defs.h"#include "smsg.h"#define WANT_BUGFIX/* Server *//* Assumes no partial reads *//*[main]*/int main(void){	int fd_server, fd_client, i;#ifdef WANT_BUGFIX	int fd_server_w;#endif	ssize_t nread;	struct simple_message msg;	char fifo_name[100];	printf("server started\n");	if (mkfifo(SERVER_FIFO_NAME, PERM_FILE) == -1 && errno != EEXIST)		EC_FAIL	// will block waiting for writer	ec_neg1( fd_server = open(SERVER_FIFO_NAME, O_RDONLY) )#ifdef WANT_BUGFIX	ec_neg1( fd_server_w = open(SERVER_FIFO_NAME, O_WRONLY) )#endif	while (true) {		/* will return EOF if no writers -- a bug! */		ec_neg1( nread = read(fd_server, &msg, sizeof(msg)) )		//printf("back from read; nread = %d\n", nread);		if (nread == 0) {			errno = ENETDOWN;			EC_FAIL		}		for (i = 0; msg.sm_data[i] != '\0'; i++)			msg.sm_data[i] = toupper(msg.sm_data[i]);		ec_false( make_fifo_name(msg.sm_clientpid, fifo_name,		  sizeof(fifo_name)) )		ec_neg1( fd_client = open(fifo_name, O_WRONLY) )		ec_neg1( write(fd_client, &msg, sizeof(msg)) )		ec_neg1( close(fd_client) )	}	/* never actually get here */	ec_neg1( close(fd_server) )#ifdef WANT_BUGFIX	ec_neg1( close(fd_server_w) )#endif	exit(EXIT_SUCCESS);EC_CLEANUP_BGN	exit(EXIT_FAILURE);EC_CLEANUP_END}