grup chatting in single oprating system

For one member

#include"header.h"

#define MYFILE1 "./myfile1"
#define MYFILE2 "./myfile2"

int main()
{
printf("\n %s : bigen",__FILE__);

struct pollfd mypol = {STDIN_FILENO,POLLIN|POLLPRI};

int ret,fd1,fd2,noc;
char msgr1[50],msgw[50],msgr2[50];

if(access(MYFILE1,F_OK) != 0)
{

ret= mkfifo(MYFILE1,666);
if(ret== -1)
{
printf("mkfifo");
exit(EXIT_FAILURE);
}

printf("\n %s-> fifo created sucessfully",__FILE__);
}
else
printf("\n %s-> fifo already created ",__FILE__);

if(access(MYFILE2,F_OK) != 0)
{

ret= mkfifo(MYFILE2,666);
if(ret== -1)
{
printf("mkfifo");
exit(EXIT_FAILURE);
}

printf("\n %s :1-> fifo created sucessfully",__FILE__, ret);
}
else
printf("\n %s2-> fifo already created ",__FILE__);

fd1= open(MYFILE1,O_RDWR|O_NONBLOCK);
if(fd1 == -1)
{
printf("open");
exit(EXIT_FAILURE);
}
else
printf("\n %s fifo opened sucessfully :%d  ",__FILE__,fd1);

fd2= open(MYFILE2,O_RDWR|O_NONBLOCK);
if(fd1 == -1)
{
printf("open");
exit(EXIT_FAILURE);
}
else
printf("\n %s fifo opened sucessfully :%d  ",__FILE__,fd1);

printf("\n %s welcome to chat ..............\n  ",__FILE__);

while(1)
{
memset(msgr2,'',50);
memset(msgr1,'',50);
memset(msgw,'',50);
if(poll(&mypol,1,500))
{
scanf(" %[^\n]",msgw);
write(fd1,msgw,50);
write(fd2,msgw,50);
}
else
{
noc=read(fd1,msgr1,50);
noc=read(fd2,msgr2,50);
}
if(strlen(msgr1))
printf("\n\t\t MEMBER 2 : %s \n  ",msgr1);

if(strlen(msgr2))
printf("\n\t\t MEMBER 3 : %s \n  ",msgr2);

if(strcmp(msgw,"end")==0 || strcmp(msgr1,"end")==0||strcmp(msgr2,"end")==0)
break;
}

printf("\n  %s : end",__FILE__);

return 0;

}
...........................................................................................end........................................................................................

For 2nd  member

#include"header.h"

#define MYFILE1 "./myfile1"
#define MYFILE3 "./myfile3"

int main()
{
printf("\n %s : bigen",__FILE__);

struct pollfd mypol = {STDIN_FILENO,POLLIN|POLLPRI};

int ret,fd1,fd2,noc;
char msgr1[50],msgw[50],msgr2[50];

if(access(MYFILE1,F_OK) != 0)
{

ret= mkfifo(MYFILE1,666);
if(ret== -1)
{
printf("mkfifo");
exit(EXIT_FAILURE);
}

printf("\n %s-> fifo created sucessfully",__FILE__);
}
else
printf("\n %s-> fifo already created ",__FILE__);

if(access(MYFILE3,F_OK) != 0)
{

ret= mkfifo(MYFILE3,666);
if(ret== -1)
{
printf("mkfifo");
exit(EXIT_FAILURE);
}

printf("\n %s :1-> fifo created sucessfully",__FILE__, ret);
}
else
printf("\n %s2-> fifo already created ",__FILE__);

fd1= open(MYFILE1,O_RDWR|O_NONBLOCK);
if(fd1 == -1)
{
printf("open");
exit(EXIT_FAILURE);
}
else
printf("\n %s fifo opened sucessfully :%d  ",__FILE__,fd1);

fd2= open(MYFILE3,O_RDWR|O_NONBLOCK);
if(fd1 == -1)
{
printf("open");
exit(EXIT_FAILURE);
}
else
printf("\n %s fifo opened sucessfully :%d  ",__FILE__,fd1);

printf("\n %s welcome to chat ..............\n  ",__FILE__);

while(1)
{
memset(msgr2,'',50);
memset(msgr1,'',50);
memset(msgw,'',50);
if(poll(&mypol,1,500))
{
scanf(" %[^\n]",msgw);
write(fd1,msgw,50);
write(fd2,msgw,50);
}
else
{
noc=read(fd1,msgr1,50);
noc=read(fd2,msgr2,50);
}
if(strlen(msgr1))
printf("\n\t\t MEMBER 1 : %s \n  ",msgr1);

if(strlen(msgr2))
printf("\n\t\t MEMBER 3 : %s \n  ",msgr2);

if(strcmp(msgw,"end")==0 || strcmp(msgr1,"end")==0||strcmp(msgr2,"end")==0)
break;
}

printf("\n  %s : end",__FILE__);

return 0;

}
..................................................................................End.....................................................................................

for 3rd  member

#include"header.h"

#define MYFILE2 "./myfile2"
#define MYFILE3 "./myfile3"

int main()
{
printf("\n %s : bigen",__FILE__);

struct pollfd mypol = {STDIN_FILENO,POLLIN|POLLPRI};

int ret,fd1,fd2,noc;
char msgr1[50],msgw[50],msgr2[50];

if(access(MYFILE2,F_OK) != 0)
{

ret= mkfifo(MYFILE2,666);
if(ret== -1)
{
printf("mkfifo");
exit(EXIT_FAILURE);
}

printf("\n %s-> fifo created sucessfully",__FILE__);
}
else
printf("\n %s-> fifo already created ",__FILE__);

if(access(MYFILE3,F_OK) != 0)
{

ret= mkfifo(MYFILE3,666);
if(ret== -1)
{
printf("mkfifo");
exit(EXIT_FAILURE);
}

printf("\n %s :1-> fifo created sucessfully",__FILE__, ret);
}
else
printf("\n %s2-> fifo already created ",__FILE__);

fd1= open(MYFILE2,O_RDWR|O_NONBLOCK);
if(fd1 == -1)
{
printf("open");
exit(EXIT_FAILURE);
}
else
printf("\n %s fifo opened sucessfully :%d  ",__FILE__,fd1);

fd2= open(MYFILE3,O_RDWR|O_NONBLOCK);
if(fd1 == -1)
{
printf("open");
exit(EXIT_FAILURE);
}
else
printf("\n %s fifo opened sucessfully :%d  ",__FILE__,fd1);

printf("\n %s welcome to chat ..............\n  ",__FILE__);

while(1)
{
memset(msgr2,'',50);
memset(msgr1,'',50);
memset(msgw,'',50);
if(poll(&mypol,1,500))
{
scanf(" %[^\n]",msgw);
write(fd1,msgw,50);
write(fd2,msgw,50);
}
else
{
noc=read(fd1,msgr1,50);
noc=read(fd2,msgr2,50);
}
if(strlen(msgr1))
printf("\n\t\t MEMBER 1 : %s \n  ",msgr1);

if(strlen(msgr2))
printf("\n\t\t MEMBER 2 : %s \n  ",msgr2);

if(strcmp(msgw,"end")==0 || strcmp(msgr1,"end")==0||strcmp(msgr2,"end")==0)
break;
}

printf("\n  %s : end",__FILE__);

return 0;

}