ber_sockbuf_remove_io - Linux

Overview

ber_sockbuf_remove_io is a highly optimized function for removing a Berkeley socket buffer from an I/O event notification mechanism. It is commonly used in conjunction with the Berkeley Sockets API and is particularly effective for handling large-scale network applications with a focus on performance and scalability.

Syntax

ber_sockbuf_remove_io(sockbuf, opaque)

• sockbuf: A pointer to a ber_socket_buf structure representing the socket buffer that needs to be removed from I/O event notification.
• opaque: A pointer to an opaque value that was previously provided when setting up the I/O event notification for the socket buffer.

Options/Flags

ber_sockbuf_remove_io does not support any options or flags.

Examples

Simple Removal of Socket Buffer from I/O Notification:

#include <sys/types.h>
#include <sys/socket.h>
#include <ber_sockbuf.h>

int main() {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    struct ber_socket_buf *sockbuf = ber_sockbuf_create(sockfd);
    ber_sockbuf_set_io_notification(sockbuf, opaque_value);
    ber_sockbuf_remove_io(sockbuf, opaque_value);
    return 0;
}

Complex Usage with Event Loop:

#include <sys/types.h>
#include <sys/socket.h>
#include <ber_sockbuf.h>
#include <event2/event.h>

int main() {
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
    struct ber_socket_buf *sockbuf = ber_sockbuf_create(sockfd);
    struct event_base *event_base = event_base_new();
    ber_sockbuf_set_io_notification(sockbuf, opaque_value);

    // Create an event to handle read events from the socket buffer
    struct event *event = event_new(event_base, sockfd, EV_READ, &read_callback, opaque_value);

    // Add the event to the event base
    event_add(event, NULL);

    // Enter the event loop
    event_base_dispatch(event_base);

    // Remove the socket buffer from I/O notification when done
    ber_sockbuf_remove_io(sockbuf, opaque_value);
    return 0;
}

Common Issues

• Invalid Socket Buffer or Opaque Value: Passing an invalid socket buffer or opaque value can result in undefined behavior and application crashes. It is crucial to ensure that these values are valid before calling ber_sockbuf_remove_io.
• Concurrent Modifications: Removing a socket buffer from I/O notification while it is still being used by other threads can lead to unexpected behavior. It is advisable to synchronize access to the socket buffer to avoid such issues.

Integration

ber_sockbuf_remove_io can be used in conjunction with other Linux commands and tools for advanced network programming. Here are a few examples:

• epoll_ctl(2): Use ber_sockbuf_remove_io to remove socket buffers from epoll event monitoring.
• select(2): Remove socket buffers from select monitoring by using ber_sockbuf_remove_io.
• poll(2): Stop polling for I/O events on socket buffers using ber_sockbuf_remove_io.

Related Commands

• ber_sockbuf_set_io_notification(3): Sets up I/O event notification for a Berkeley socket buffer.
• event2(3): A high-performance event notification framework that can be used with ber_sockbuf_remove_io for handling I/O events.