Assume you have a server with two clients and two child processes. The server retrieves data from the
children through a pipe (one each) and writes data to the clients through a socket (one each). child1
produces data for client1, and child2 for client2.
Write a C loop that performs the above actions, making sure that at no time will the server sit and wait
for data from one child when the other child has data to pass. If either child dies, exit the loop.
You need to write only the loop transferring the data. Assume that all connections to pipes and sockets
have been established, and no more clients will try to connect to this server.
The pipes are declared in arrays p1 and p2, respectively. The sockets are s1, and s2.
You may use this function (you do not have to write it):
int transfer(int p, int s)
which gets data from pipe p and puts it into socket s, and returns the number of bytes read from the pipe.
is this correct?
Code:
while(1) {
rset = allset;
nready = select(maxfd+1, &rset, NULL, NULL, NULL);
if (nready < 0) {
perror("ERROR select error");
}
else if (FD_ISSET(p1[0], &rset)) {
if ((bytes = transfer(p1[0], s1)) < 0) {
perror("ERROR read error");
}
else if (bytes==0) {
break;
}
}
else if (FD_ISSET(p2[0], &rset)) {
if ((bytes = transfer(p2[0], s2)) < 0) {
perror("ERROR read error");
}
else if (bytes==0) {
break;
}
}
}
For this question, this code isn't from a program, i am just assuming the other parts are there, i just want to get the loop right. So just assume the rest is there. The question says just to write the loop part. By the way you did read the question right?
Assume you have a server with two clients and two child processes. The server retrieves data from the <copypasted newline>
children through a pipe (one each) and writes data to the clients through a socket (one each). child1 <copypasted newline>
produces data for client1, and child2 for client2. <copypasted newline>
Write a C loop that performs the above actions, making sure that at no time will the server sit and wait <copypasted newline>
for data from one child when the other child has data to pass. If either child dies, exit the loop. <copypasted newline>
You need to write only the loop transferring the data. Assume that all connections to pipes and sockets <copypasted newline>
have been established, and no more clients will try to connect to this server. <copypasted newline>
The pipes are declared in arrays p1 and p2, respectively. The sockets are s1, and s2. <copypasted newline> You may use this function (you do not have to write it): <copypasted newline>
int transfer(int p, int s)<copypasted newline>
which gets data from pipe p and puts it into socket s, and returns the number of bytes read from the pipe. <copypasted newline>
is this correct?
I'm not helping you with your homework. And now I'm forced to suspect that everything you've posted so far is homework. It'd explain your bizzare reluctance to post all your code -- maybe it's not all yours.
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More-than-likely, posting homework in the main forums has resulting in a forum infraction. If you did not post homework, please explain the company you work for and the nature of the problem you are working on.
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