libdill: Structured Concurrency for C

NAME

tcp_accept - accepts an incoming TCP connection

SYNOPSIS

#include <libdill.h>

int tcp_accept(
    int s,
    struct ipaddr* addr,
    int64_t deadline);

DESCRIPTION

TCP protocol is a reliable bytestream protocol for transporting data over network. It is defined in RFC 793.

This function accepts an incoming TCP connection.

s: Socket created by tcp_listen.

addr: Out parameter. IP address of the connecting endpoint. Can be NULL.

deadline: A point in time when the operation should time out, in milliseconds. Use the now function to get your current point in time. 0 means immediate timeout, i.e., perform the operation if possible or return without blocking if not. -1 means no deadline, i.e., the call will block forever if the operation cannot be performed.

The socket can be cleanly shut down using tcp_close function.

This function is not available if libdill is compiled with --disable-sockets option.

RETURN VALUE

In case of success the function returns handle of the new connection. In case of error it returns -1 and sets errno to one of the values below.

ERRORS

EBADF: Invalid handle.
ECANCELED: Current coroutine was canceled.
EMFILE: The maximum number of file descriptors in the process are already open.
ENFILE: The maximum number of file descriptors in the system are already open.
ENOMEM: Not enough memory.
ENOTSUP: The handle does not support this operation.
ETIMEDOUT: Deadline was reached.

EXAMPLE

struct ipaddr addr;
ipaddr_local(&addr, NULL, 5555, 0);
int ls = tcp_listen(&addr, 10);
int s = tcp_accept(ls, NULL, -1);
bsend(s, "ABC", 3, -1);
char buf[3];
brecv(s, buf, sizeof(buf), -1);
tcp_close(s);
tcp_close(ls);