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Questions tagged [setsockopt]

142 questions
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Is the tcp window size relevant to the SND_BUF or RCV_BUF of the tcp socket?

I want to know when I change the SND_BUF of a socket via setsockopt API, will the original window size of the TCP layer be changed accordingly?
ciphor
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LWIP -- using option `SO_BINDTODEVICE` with `lwip_setsockopt()` returns error `ENODEV`

With LWIP, I usually set up my ethernet interface on my embedded device like this (not all argument definitions are specified here): struct netif gnetif; // Set up the ethernet interface on embedded device. netif_add(&gnetif, &ipaddr, &netmask,…
71GA
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setsockopt() returns 10042 error code with winsock.h

I am trying to listen a socket using multicast but it seems that am not using the setsockopt function well. I have been searching the meaning of the error code 10042 and I have found…
Londo
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Should the values set with setsockopt stay valid during lifetime of the socket?

I'm trying to create helper functions to setup the keep alive of a tcp socket. The setsockopt function accepts a pointer to a value. My question is, does the value have to stay valid for the entire lifetime of the socket or only while executing this…
Bas Visscher
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How do I setsockopt of a TcpStream via libc?

I know TcpStream has stream.set_read_timeout but I need to make it in libc for Windows, but my code don´t works and I believe it is because I can't understand the way to put milliseconds in _value: *const c_char. In Rust I wrote let qtie =…
navetix
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Error setsockopt IP_ADD_MEMBERSHIP: No such device

I writting an application that should be able to receive IPv4 or IPv6 multicast datagrams on a socket. I wrote a function that enables the reception of multicast datagrams for a socket through setsockopt (see code below). The strange problem that i…
mab0189
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What is the predictable behavior of changing SOL_SOCKET, SO_RCVBUF on the fly on a UDP socket?

What should be expected to happen if we resize the input buffer of a UDP server socket on the fly on a Linux system? setsockopt(sock, SOL_SOCKET, SO_RCVBUF, ...) I am particularly interested in these questions: If I shrink below what is currently…
FlorianB
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Why are there no scm_timestamping control messages coming up?

My code consists of two programs: a TCP server and a TCP client. The goal of the project is to get timestamping for TCP working. I consulted this piece of linux documentation, and I can't seem to find anything that would indicate that my code…
wojtat
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Setting Python GRPC client socket options

I am looking at a way to set socket options in grpc python. Scenario: I am running a GRPC client on a host with multiple interfaces and routes defined per interface, called VRF (Virtual Routing and Forwarding). My application has to bind to a…
user489023
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Socket C - setsockopt timeout do some things before closing

I use setsockopt with SO_RCVTIMEO option to set a timeout on my socket recv function. It works, but it instantly closes the socket when time is exceeded. I want to send a message before closing, is it possible ? (My program have to work on Windows…
Silta
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How to resolve "setsockopt(3, SOL_SOCKET, SO_MARK, [10], 4) = -1 EPERM" Operation denied for none root users

I got two network interfaces (ethernet and wlan). Now I found a little script on github (https://github.com/Intika-Linux-Firewall/App-Route-Jail) which seems to allow me to route specific applications through the none default gateway to loadbalance…
Dominik S.
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How to modify IP header options for SYN/ACK packets?

To produce packets with extended IP header setsockopt operation can be performed with level SOL_IP and option IP_OPTIONS: int ipoption=0xbaadf00d; int sockfd=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP); setsockopt(sockfd, SOL_IP, IP_OPTIONS,…
Mikhail Sorokhtin
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Why recv returns -1 and errno=EINTR when set SO_RCVTIMEO?

This problem only hapens when socket is set timeout with SO_RCVTIMEO. recv should block for 3sec. But it returns because of EINTR as soon as another thread starts. If I run thread t2, recv in thread t1 will return -1 without blocking and sets errno…
zero15
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(recv() == 0) means disconnected or timed out? (sockets, Linux&Windows)

I have set a timeout on my blocking socket .. DWORD to = 1200; if (setsockopt (soc, SOL_SOCKET, SO_RCVTIMEO, (char *)&to, sizeof(to))) { ... } In the case that recv () then returns zero, how can I tell this is link disconnected or read timed…
RichEarle
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Why no error when setting socket send/receive buffer size higher than sysctl max?

Why no error when setting socket send/receive buffer size higher than sysctl max (as I have demonstrated below)? is no error the "expected behavior"? My sysctl values for socket rmem_max and wmem_max are both set to 212992: net.core.rmem_default =…
Trevor Boyd Smith
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