//Demonstration of named pipes 
//Write opens a pipe then it writes into the pipe

#include <stdio.h>
#include <stdlib.h>
//Pipe call
#include <fcntl.h>
//mknod call
#include <sys/types.h>
#include <sys/stat.h>

#define BUFLEN 100

//Prototypes

int main (void);
void input(char *);

//Var's

//Filedescritpor 
int fdes;
int a,i;
char *s, buffer[BUFLEN];

int main(void)
{
/*
Creates a  FIFO-File with the rights read/write 
for the user and read for others. 
*/
mknod(\"pipe1\",S_IFIFO | 0666,0);

/*
Opens a pipe. This process can only write into a pipe. If its opend successfull open() gives the filedescriptor back otherwise -1. 
*/
if((fdes=open(\"pipe1\",O_WRONLY))==-1){
puts(\"Error couldn't open pipe\");
exit(-1);
}

//Writes the buffer into the FIFO file
input(buffer);
if((i=write(fdes,buffer,BUFLEN)) !=BUFLEN) {
printf(\"Error couldn't write\");
exit(-1);
}

//Now we have to close the FIFO File
close(fdes);
exit(0);
}

//Get input?:0
void input(char *buffer)
{
printf(\"Enter a String(max 100 Chars):\");
buffer = gets(buffer);
}

//open and reads a pipe 
#include <stdio.h>
#include <stdlib.h>
//Pipe call
#include <fcntl.h>
//mknod call
#include <sys/types.h>
#include <sys/stat.h>

#define BUFLEN 100

//Protoypes
int main(void);

//Vars
int fdes;
char buffer[BUFLEN];
char c;

int main(void)
{
	//A pipe gets opend in \"read only\" mode. 
	if((fdes=open(\"pipe1\",O_RDONLY))==(-1))
	{
	printf(\"Error couldn't open pipe\");
	exit(-1);
	}
	read(fdes,buffer,BUFLEN);
	puts(buffer);
	close(fdes);
	exit(0);
}