embed PHP と Stream API で HTTP/1 サーバー。最新版は https://github.com/masakielastic/php-embed-stream-http

server.c

#include <php.h>
#include <Zend/zend_smart_str.h>
#include <sapi/embed/php_embed.h>

static int run_min_server(void);

int main(int argc, char **argv)
{
    PHP_EMBED_START_BLOCK(argc, argv)

    (void) run_min_server();

    PHP_EMBED_END_BLOCK()

    return 0;
}

static int run_min_server(void)
{
    php_stream *server = NULL;
    php_stream *client = NULL;
    zend_string *err_text = NULL;
    zend_string *peer = NULL;
    int errcode = 0;

    server = php_stream_xport_create(
        "tcp://127.0.0.1:8080",
        sizeof("tcp://127.0.0.1:8080") - 1,
        REPORT_ERRORS,
        STREAM_XPORT_SERVER | STREAM_XPORT_BIND | STREAM_XPORT_LISTEN,
        NULL,
        NULL,
        NULL,
        &err_text,
        &errcode
    );

    if (!server) {
        php_printf("server create failed: %s (%d)\n",
            err_text ? ZSTR_VAL(err_text) : "unknown", errcode);
        if (err_text) {
            zend_string_release(err_text);
        }
        return FAILURE;
    }

    for (;;) {
        zend_string *accept_error = NULL;

        if (php_stream_xport_accept(server, &client, &peer, NULL, NULL, NULL, &accept_error) < 0) {
            php_printf("accept failed: %s\n",
                accept_error ? ZSTR_VAL(accept_error) : "unknown");

            if (accept_error) {
                zend_string_release(accept_error);
            }
            break;
        }

        if (client) {
            char buf[4096];
            ssize_t n;

            n = php_stream_read(client, buf, sizeof(buf) - 1);
            if (n > 0) {
                smart_str request_log = {0};
                smart_str response = {0};

                buf[n] = '\0';

                smart_str_appends(&request_log, "request:\n");
                smart_str_appendl(&request_log, buf, (size_t) n);
                smart_str_appends(&request_log, "\n");
                smart_str_0(&request_log);

                php_printf("%s", ZSTR_VAL(request_log.s));

                smart_str_appends(&response, "HTTP/1.1 200 OK\r\n");
                smart_str_appends(&response, "Content-Type: text/plain\r\n");
                smart_str_appends(&response, "Content-Length: 12\r\n");
                smart_str_appends(&response, "Connection: close\r\n");
                smart_str_appends(&response, "\r\n");
                smart_str_appends(&response, "hello world\n");
                smart_str_0(&response);

                php_stream_write(client, ZSTR_VAL(response.s), ZSTR_LEN(response.s));

                smart_str_free(&request_log);
                smart_str_free(&response);
            }

            php_stream_xport_shutdown(client, STREAM_SHUT_RDWR);
            php_stream_close(client);
            client = NULL;
        }

        if (peer) {
            zend_string_release(peer);
            peer = NULL;
        }
    }

    php_stream_close(server);
    return 0;
}