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Questions tagged [libevent]

libevent is an API for writing event driven systems. libevent is written in C and should compile on Linux, *BSD, Mac OS X, Solaris and Windows.

From the Homepage: Libevent

libevent is meant to replace the event loop found in event driven network servers. An application just needs to call event_dispatch() and then add or remove events dynamically without having to change the event loop.

Currently, libevent supports /dev/poll, kqueue(2), event ports, select(2), poll(2) and epoll(4). The internal event mechanism is completely independent of the exposed event API, and a simple update of libevent can provide new functionality without having to redesign the applications. As a result, Libevent allows for portable application development and provides the most scalable event notification mechanism available on an operating system. Libevent can also be used for multi-threaded applications; see Steven Grimm's explanation. Libevent should compile on Linux, *BSD, Mac OS X, Solaris and Windows.

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Is it safe to store pointers to bufferevents?

I am working on a daemon, in C using libevent library, which accepts TCP connections and creates bufferevent (socket) for each accepted connection as following struct bufferevent *bev = bufferevent_socket_new( base, sfd, …
fade2black
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can I use curl_multi/multi_socket with libevent

I'm using libevent2 for building a server, and I'm trying to enable the server to use libcurl asynchronously, and I'm wondering about how I do that with libevent2. I would like to be able to get curl to send events so I can inspect the current…
MathGladiator
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Can I replace libcurl with libevent for file download only

I am new to libevent and experimenting some stuff here. I am given a URL of a file, I need to download this file using URL. can I perform this task using libevent in anyway ? I am able to perform above task using libcurl. But interested to know if…
Anup Kavari
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How to call bufferevent_write several times?

I am a newbie in libevent, my program below is quite simple. I want to call bubufferevent_write several times, but is seems that it works only for the 1st time. int main(int argc, char const *argv[]) { struct sockaddr_in serv_addr; struct…
HuangJie
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python socket handle keepalive request

I am using python to write a simple web server, and sending requests to it. And I use libevent as my http client. But every time I send a keep-alive request, the http connection have the close callback before the success callback. I think it might…
Xiaoying Wang
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What is the implementation detail of libevent? An encapsulation of poll mechanism?

libevent provides programmers the ability to write asynchronous programs due to the event notifications and callback function supports. I don't know if the linux kernel provides such system calls to notify user space applications when a particular…
Douglas Su
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Multiple libevent bases in different threads on the same fd

I'm curious to know if anyone else has tried this... I'm about to give it a go, but was hoping someone else may have some experience to share before I sit here at 11:00 pm (having to go to work in the morning) to try this. If I load up a few…
Jonny Whatshisface
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adding timer events with event_base_loop

my ebase thread perform the following loop constexpr int kFlag = EVLOOP_ONCE; while ((res = event_base_loop(ebase_, kFlag)) == 1) { yield(); } and the other (main) thread adds periodic timer event. It adds the event after the ebase…
Roman
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how to properly deal with send/write with a non-blocking socket?

I have a socket which is used to receive and also send packets. And the pseudo codes are: setnonblock(fd); add_event(event_base, recv_ev); while("I have packets to write"){ send(fd, packet); .... } .... now the issue is,…
lily
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My libevent timer stops as soon as another event occurs... is that normal?

Currently I setup two events: Listen for new connections from clients (I'm a server) A timer to run some code once a second to do various background work On startup the timer works and I can wait as long as I want and my callback gets called over…
Alexis Wilke
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the callback passed to evhttp_request_new might get NULL

The following function is a callback passed to evhttp_request_new(). My code sometime abort because of assert fail. I am confusing that what may cause the pointer req to get NULL? void http_request_done(struct evhttp_request *req, void *arg) { …
Ivan Tsang
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php libevent is multithreaded?

I have wrote simple server on php and libevent.
Max P.
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libevent problems with linking on ubuntu server 14.04

I have problem with linking libevent into my c project on ubuntu 14.04 LTS Server. Everything works fine on ArchLinux and Centos7 (both ubuntu and centos I run on virtual machine). These is my Makefile: TARGET: opoznienia CFLAGS = -Wall -O2…
Michał Piotr Stankiewicz
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Protobuf and Non-blocking message send/recv

I am developing my message passing interface using protobuf and non-blocking libevent socket libraries. Because of the non-blocking properties, the read callback by libevent might be invoked at some points where the messages are not complete (e.g.,…
Jes
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File descriptor does write data in C

I am using the joyent http-parser and lib event to create my own simple web server in C. I have it connecting to the port and receiving the HTTP requests fine, however, I am not able to send a response using the socket. So in one window I enter: $…
jnd
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