Use the client and server programs,change it so that the client sends an integer to the client. The server multiplies the number by 10 and returns the integer*10 back to the client. When writing the integers to the FIFO, use sizeof(int) as the number of bytes in the 3rd parameter of the write( ) and read( ).

//Client Program

#include #include

main (void) { int fda; // to write to server int fdb; // to read response from server int charbuff[1]; // buffer holds a character int outchar[7]; // server puts string here memset(charbuff,0,1); memset(outchar,0,7);

if((fda=open("FIFO_to_server", O_WRONLY))<0) printf("cant open fifo to write");

if((fdb=open("FIFO_to_client", O_RDONLY))<0) printf("cant open fifo to read");

printf("Client: Please enter a character: "); scanf("%d", &charbuff);

write(fda, charbuff, 1); printf(" Client: Got the character sent, now waiting for response "); read(fdb, outchar, 7); printf(" Client: received from server %s", outchar);

close(fda); close(fdb);

printf (" all done! "); }

//Server Program

#include #include #include

main (void) { int fda; // to read from client int fdb; // to write to client int finish; // lets me know that client is done int i; // because C needs this defined as int

int charbuff[1]; // buffer holds a character int outchar[7]; // server puts string here memset(charbuff,0,1); memset(outchar,0,7);

/* Create the fifos and open them */ if ((mkfifo("FIFO_to_server",0666)<0 && errno != EEXIST)) { perror("cant create FIFO_to_server"); exit(-1); }

if ((mkfifo("FIFO_to_client",0666)<0 && errno != EEXIST)) { perror("cant create FIFO_to_client"); exit(-1); }

if((fda=open("FIFO_to_server", O_RDONLY))<0) printf("cant open fifo to write");

if((fdb=open("FIFO_to_client", O_WRONLY))<0) printf("cant open fifo to read"); finish=read(fda, charbuff, 1); //read the character printf("Server: just got character: ,%d", charbuff[0]);

for( i = 0; i<5; i++) outchar[i] = '*'; outchar[5] = charbuff[0]; outchar[6] = 0; printf(" Server: outchar is,%d", outchar);

write(fdb, outchar, 7); printf(" Server: Got the characters sent"); if(finish == 1) printf(" Server: This says I am ready to close ");

close(fda); close(fdb); unlink("FIFO_to_server"); unlink("FIFO_to_client");

}