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events_api_thread.c
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events_api_thread.c
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// Copyright(c) 2018-2022, Intel Corporation
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of Intel Corporation nor the names of its contributors
// may be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif // HAVE_CONFIG_H
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#ifndef __USE_GNU
#define __USE_GNU
#endif
#include <sys/socket.h>
#include <sys/un.h>
#include <poll.h>
#include <inttypes.h>
#include "events_api_thread.h"
#include "api/opae_events_api.h"
#include "mock/opae_std.h"
#ifdef LOG
#undef LOG
#endif
#define LOG(format, ...) \
log_printf("events_api_thread: " format, ##__VA_ARGS__)
events_api_thread_config events_api_config = {
.global = &global_config,
.sched_policy = SCHED_RR,
.sched_priority = 10,
};
#define MAX_CLIENT_CONNECTIONS 1023
#define SRV_SOCKET 0
#define FIRST_CLIENT_SOCKET 1
/* array keeping track of all connection file descriptors (plus server socket) */
STATIC struct pollfd pollfds[MAX_CLIENT_CONNECTIONS+1];
STATIC nfds_t num_fds = 1;
STATIC void remove_client(int conn_socket)
{
nfds_t i, j;
nfds_t removed = 0;
opae_api_unregister_all_events_for(conn_socket);
LOG("closing connection conn_socket=%d.\n", conn_socket);
opae_close(conn_socket);
for (i = j = FIRST_CLIENT_SOCKET ; i < num_fds ; ++i) {
if (conn_socket != pollfds[i].fd) {
if (j != i)
pollfds[j] = pollfds[i];
++j;
} else {
++removed;
}
}
num_fds -= removed;
}
STATIC int handle_message(int conn_socket)
{
struct msghdr mh;
struct cmsghdr *cmh;
struct iovec iov[1];
struct event_request req;
char buf[CMSG_SPACE(sizeof(int))];
ssize_t n;
int *fd_ptr;
/* set up ancillary data message header */
iov[0].iov_base = &req;
iov[0].iov_len = sizeof(req);
memset(buf, 0, sizeof(buf));
mh.msg_name = NULL;
mh.msg_namelen = 0;
mh.msg_iov = iov;
mh.msg_iovlen = sizeof(iov) / sizeof(iov[0]);
mh.msg_control = buf;
mh.msg_controllen = CMSG_LEN(sizeof(int));
mh.msg_flags = 0;
cmh = CMSG_FIRSTHDR(&mh);
cmh->cmsg_len = CMSG_LEN(sizeof(int));
cmh->cmsg_level = SOL_SOCKET;
cmh->cmsg_type = SCM_RIGHTS;
n = recvmsg(conn_socket, &mh, 0);
if (n < 0) {
LOG("recvmsg() failed: %s\n", strerror(errno));
return (int)n;
}
if (!n) { // socket closed by peer
remove_client(conn_socket);
return (int)n;
}
switch (req.type) {
case REGISTER_EVENT:
fd_ptr = (int *)CMSG_DATA(cmh);
if (opae_api_register_event(conn_socket, *fd_ptr,
req.event, req.object_id)) {
LOG("failed to register event\n");
return -1;
}
LOG("registered event sock=%d:fd=%d"
"(event=%d object_id=0x%" PRIx64 ")\n",
conn_socket, *fd_ptr, req.event, req.object_id);
break;
case UNREGISTER_EVENT:
if (opae_api_unregister_event(conn_socket,
req.event,
req.object_id)) {
LOG("failed to unregister event\n");
return -1;
}
LOG("unregistered event sock=%d:"
"(event=%d object_id=0x%" PRIx64 ")\n",
conn_socket, req.event, req.object_id);
break;
default:
LOG("unknown request type %d\n", req.type);
return -1;
}
return 0;
}
STATIC volatile bool evt_api_is_ready = false;
bool events_api_is_ready(void)
{
return evt_api_is_ready;
}
void *events_api_thread(void *thread_context)
{
events_api_thread_config *c =
(events_api_thread_config *)thread_context;
struct sched_param sched_param;
int policy = 0;
int res;
nfds_t i;
struct sockaddr_un addr;
int server_socket;
int conn_socket;
size_t len;
LOG("starting\n");
res = pthread_getschedparam(pthread_self(), &policy, &sched_param);
if (res) {
LOG("error getting scheduler params: %s\n", strerror(res));
} else {
policy = c->sched_policy;
sched_param.sched_priority = c->sched_priority;
res = pthread_setschedparam(pthread_self(),
policy,
&sched_param);
if (res) {
LOG("error setting scheduler params"
" (got root?): %s\n", strerror(res));
}
}
unlink(c->global->api_socket);
server_socket = socket(AF_UNIX, SOCK_STREAM, 0);
if (server_socket < 0) {
LOG("failed to create server socket.\n");
goto out_exit;
}
LOG("created server socket.\n");
addr.sun_family = AF_UNIX;
len = strnlen(c->global->api_socket, sizeof(addr.sun_path) - 1);
memcpy(addr.sun_path, c->global->api_socket, len);
addr.sun_path[len] = '\0';
if (bind(server_socket, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
LOG("failed to bind server socket.\n");
goto out_close_server;
}
LOG("server socket bind success.\n");
if (listen(server_socket, 20) < 0) {
LOG("failed to listen on socket.\n");
goto out_close_server;
}
LOG("listening for connections.\n");
evt_api_is_ready = true;
pollfds[SRV_SOCKET].fd = server_socket;
pollfds[SRV_SOCKET].events = POLLIN | POLLPRI;
num_fds = 1;
while (c->global->running) {
res = poll(pollfds, num_fds, 100);
if (res < 0) {
LOG("poll error\n");
continue;
}
if (0 == res) // timeout
continue;
if ((nfds_t)res > num_fds) { // weird
LOG("something bad happened during poll!\n");
continue;
}
// handle requests on existing sockets
for (i = FIRST_CLIENT_SOCKET ; i < num_fds ; ++i) {
if (pollfds[i].revents) {
handle_message(pollfds[i].fd);
}
}
// handle new connection requests
if (pollfds[SRV_SOCKET].revents) {
if (num_fds == MAX_CLIENT_CONNECTIONS+1) {
LOG("exceeded max connections!\n");
continue;
}
conn_socket = accept(server_socket, NULL, NULL);
if (conn_socket < 0) {
LOG("failed to accept new connection!\n");
} else {
LOG("accepting connection %d.\n", conn_socket);
pollfds[num_fds].fd = conn_socket;
pollfds[num_fds].events = POLLIN | POLLPRI;
++num_fds;
}
}
}
opae_api_unregister_all_events();
// close any active client sockets
for (i = FIRST_CLIENT_SOCKET ; i < num_fds ; ++i) {
opae_close(pollfds[i].fd);
}
out_close_server:
evt_api_is_ready = false;
opae_close(server_socket);
out_exit:
LOG("exiting\n");
return NULL;
}