Tagged Questions

3
votes
2answers
57 views

Cross-process dup on Linux

I'd like to dup a file descriptor running in an unrelated process on Linux. I know about sendmsg(2) and SCM_RIGHTS (e.g. ...
0
votes
1answer
105 views

Socket buffer and purpose of SO_RCVBUF [closed]

I'm trying to figure out what the SO_RCVBUF actually does. Referring to the Linux kernel, it seems that the value specified with this option is just assigned to a variable (sk_buff.rcvbuf), which ...
0
votes
1answer
226 views

pcap and raw socket [closed]

I want to develop an application (module or user-level if possible) to create a raw socket in RHEL stealing all level-2 packets directly from kernel (without being routed or handled by other open ...
3
votes
2answers
887 views

File descriptor linked to socket or pipe in proc [duplicate]

Possible Duplicate: /proc/PID/fd/X link number i have a question regarding the file descriptors and their linkage in the proc file system. I've observed that if i list the file descriptors ...
0
votes
2answers
273 views

Force getaddrinfo to use IPv4

The man page says: The getaddrinfo(3) function is not limited to creating IPv4 socket address structures; IPv6 socket address structures can be created if IPv6 support is available. These ...
3
votes
1answer
1k views

Kill TIME_WAIT sockets immediately?

Is there anyway to kill those TIME_WAIT sockets immediately ? e.g output of netstat: tcp 0 0 127.0.0.1:8080 127.0.0.1:41500 TIME_WAIT - tcp 0 ...
2
votes
2answers
294 views

Size of data that can be written to / read from sockets

I was wondering if there is an easy way to find the maximum size that is supported by Linux sockets? (Is this configurable? If so where?) For example, most of the socket examples found on the web ...
1
vote
1answer
280 views

How to limit all tcp traffic to the network interface the session was initiated on?

I have an embedded linux system with two network interfaces (lan0, wlan0) that are configured to the same subnet. A server on this system accepts tcp connections on both interfaces. How I can assure ...
4
votes
2answers
2k views

Write inside a socket open by another process in Linux

Is it possible on Linux for a process to write inside a socket open by another one? Let's say I open a connection to google.com using netcat: myuser@linux:~$ nc google.com 80 Now I can lookup for ...
8
votes
1answer
585 views

Kernel socket structure and TCP_DIAG

I'm working on a software which connects to a Real Time data server (using TCP) and I have some connections dropping. My guess is that the clients do not read the data coming from the server fast ...
4
votes
1answer
898 views

How long is a TCP local socket address that has been bound unavailable after closing?

On Linux (my live servers are on RHEL 5.5 - the LXR links below are to the kernel version in that), man 7 ip says: A TCP local socket address that has been bound is unavailable for some time after ...
16
votes
2answers
2k views

Who's got the other end of this unix socketpair?

I want to determine what process has the other end of a unix socket, that was created with socketpair(). I have a program parent which creates a socketpair(AF_UNIX, SOCK_STREAM, 0, fds), and fork()s. ...
7
votes
2answers
2k views

/proc/PID/fd/X link number

In Linux, in /proc/PID/fd/X, the links for file descriptors that are pipes or sockets have a number, like: l-wx------ 1 user user 64 Mar 24 00:05 1 -> pipe:[6839] l-wx------ 1 user user 64 Mar 24 ...