I basically want to inform main that a client disconnected in order to decrement the thread counter. Right now my program is setup to only create a certain number of threads to serve the connecting clients. If the client disconnects the thread count needs to be decremented so that it does not max out and not allow further threads to be made for waiting clients.
Now I can use a global variable, but I am doing this to learn more about Unix system programming and I thought either pipes or message queues would be interesting to try out. My problem is I am not sure how my code can utilize this to send information from child thread to main thread.
I wrote some quick and dirty code as an to test out different ways of what I need to do.
In my code I commented where I want to send message back to main process.
I have client code if you do need I can post, but the code below should be sufficient.
Hi all,
I'm trying to write a program that has some data it wants to send through a filter program(in this case tr), and then recieve the output from that filter program. The way I'm trying to do it is by setting up two pipes between the programs and piping the data in through one pipe and back... (2 Replies)
Hi,
I am stuck up with a strange problem.
I am writing an application - a kinda tracker that reads data from memcache and invokes theads to process each record of the memcache.
I dont want to join all my threads because my tracker should poll the cache in regular intervals say sum 300... (2 Replies)
i have a parent process and 5 child process.
As soon as the parent process is completed the 5 child processes need to start simultaneously (like multithreading)
All I need to do in a shell script
the child process is a function
can any one help me on this
thanks in advance (1 Reply)
Hi guys, I'm having some problem here, I'm studying pipes, and i want to create a shell in C and at this point a don't want to use semaphores, instead I want to use tricks. Straight to the doubt: I've a parent and a child process, and both of them has some code to execute, and the child process... (5 Replies)
Parent Thread Of Child Thread
Suppose a process creates some threads say threadC and threadD.
Later on each of these threads create new child threads say threadC1, threadC2, threadC3 etc. So a tree of threads will get created.
Is there any way to find out the parent thread of one such... (1 Reply)
Hi all,
Can I create multiple threads using single thread_id
like
pthread_t thread_id;
pthread_create(&thread_id, NULL, &print_xs, NULL);
pthread_create(&thread_id, NULL, &print_ys, NULL);
pthread_create(&thread_id, NULL, &print_zs, NULL);
pthread_join(thread_id, NULL);
what... (2 Replies)
Hi!
I am writing a C program that will create a child, child will create a thread and the thread will send a message to a unnamed pipe and will print the message before exiting.
here is my work:
#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include... (6 Replies)
What is the best way for a parent to kill a child thread that has blocked on a command it cannot finish and will never read another line of its code? Will pthread_cancel() work with a thread that will never stop processing its current line of code? Thanks. (4 Replies)
Hi,
I am trying my hand in networking programming in C, and got stuck in piping.
I was following some tutorial and did the forking like :
while (1)
{
newsockfd = accept(sockfd,
(struct sockaddr *) &cli_addr, &clilen);
if (newsockfd < 0)
... (4 Replies)
I would like to know is there any we can kill a single thread among multiple threads belongs to process?
Since Signal action is process wise not per thread, i strongly feel that we can not or for that mater from external sources as well single thread can not be killed which is critical section... (2 Replies)
Discussion started by: murali242512
2 Replies
LEARN ABOUT ULTRIX
telnetd
telnetd(8c)telnetd(8c)Name
telnetd - DARPA TELNET protocol server
Syntax
/etc/telnetd
Description
The server supports the DARPA standard TELNET virtual terminal protocol. The TELNET server is invoked when receives a connection request
on the port indicated in the TELNET service description.
The server operates by allocating a pseudo-terminal device for a client, then creating a login process which has the slave side of the
pseudo-terminal as stdin, stdout, and stderr. The server manipulates the master side of the pseudo terminal, implementing the TELNET pro-
tocol and passing characters between the client and login process.
When a TELNET session is started up, sends a TELNET option to the client side indicating a willingness to do remote echo of characters, to
suppress go ahead, and to receive terminal type information from the remote client. If the remote client is willing, the remote terminal
type is propagated in the environment of the created login process. The pseudo terminal allocated to the client is configured to operate
in cooked mode and with XTABS and CRMOD enabled.
Aside from this initial setup, the only mode changes will carry out are those required for echoing characters at the client side of the
connection.
The server supports binary mode, suppress go ahead, echo, and timing mark. It also allows a remote client to do binary, terminal type, and
suppress go ahead.
Restrictions
Some TELNET commands are only partially implemented.
The TELNET protocol allows the exchange of the number of lines and columns on the user's terminal, but does not make use of them.
The terminal type name received from the remote client is converted to lower case.
The server never sends TELNET go ahead commands.
See Alsotelnet(1c), pty(4), tty(4), services(5), inetd(8c)telnetd(8c)