libdill: Structured Concurrency for C

NAME

http_attach_mem - creates HTTP protocol on top of underlying socket

SYNOPSIS

#include <libdill.h>

int http_attach_mem(
    int s,
    struct http_storage* mem);

DESCRIPTION

WARNING: This is experimental functionality and the API may change in the future.

HTTP is an application-level protocol described in RFC 7230. This implementation handles only the request/response exchange. Whatever comes after that must be handled by a different protocol.

This function instantiates HTTP protocol on top of the underlying protocol.

This function allows to avoid one dynamic memory allocation by storing the object in user-supplied memory. Unless you are hyper-optimizing use http_attach instead.

s: Handle of the underlying socket. It must be a bytestream protocol.

mem: The structure to store the newly created object in. It must not be deallocated before the object is closed.

The socket can be cleanly shut down using http_detach function.

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

RETURN VALUE

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

ERRORS

EBADF: Invalid handle.
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.
EPROTO: Underlying socket is not a bytestream socket.

EXAMPLE

int s = tcp_connect(&addr, -1);
s = http_attach(s);
http_sendrequest(s, "GET", "/", -1);
http_sendfield(s, "Host", "www.example.org", -1);
http_done(s, -1);
char reason[256];
http_recvstatus(s, reason, sizeof(reason), -1);
while(1) {
    char name[256];
    char value[256];
    int rc = http_recvfield(s, name, sizeof(name), value, sizeof(value), -1);
    if(rc == -1 && errno == EPIPE) break;
}
s = http_detach(s, -1);
tcp_close(s);