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/*
* Copyright 6WIND S.A., 2014
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* (at your option) any later version. See the COPYING file in the
* top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "ivshmem-client.h"
#define IVSHMEM_CLIENT_DEFAULT_VERBOSE 0
#define IVSHMEM_CLIENT_DEFAULT_UNIX_SOCK_PATH "/tmp/ivshmem_socket"
typedef struct IvshmemClientArgs {
bool verbose;
const char *unix_sock_path;
} IvshmemClientArgs;
/* show ivshmem_client_usage and exit with given error code */
static void
ivshmem_client_usage(const char *name, int code)
{
fprintf(stderr, "%s [opts]\n", name);
fprintf(stderr, " -h: show this help\n");
fprintf(stderr, " -v: verbose mode\n");
fprintf(stderr, " -S <unix_sock_path>: path to the unix socket\n"
" to connect to.\n"
" default=%s\n", IVSHMEM_CLIENT_DEFAULT_UNIX_SOCK_PATH);
exit(code);
}
/* parse the program arguments, exit on error */
static void
ivshmem_client_parse_args(IvshmemClientArgs *args, int argc, char *argv[])
{
int c;
while ((c = getopt(argc, argv,
"h" /* help */
"v" /* verbose */
"S:" /* unix_sock_path */
)) != -1) {
switch (c) {
case 'h': /* help */
ivshmem_client_usage(argv[0], 0);
break;
case 'v': /* verbose */
args->verbose = 1;
break;
case 'S': /* unix_sock_path */
args->unix_sock_path = optarg;
break;
default:
ivshmem_client_usage(argv[0], 1);
break;
}
}
}
/* show command line help */
static void
ivshmem_client_cmdline_help(void)
{
printf("dump: dump peers (including us)\n"
"int <peer> <vector>: notify one vector on a peer\n"
"int <peer> all: notify all vectors of a peer\n"
"int all: notify all vectors of all peers (excepting us)\n");
}
/* read stdin and handle commands */
static int
ivshmem_client_handle_stdin_command(IvshmemClient *client)
{
IvshmemClientPeer *peer;
char buf[128];
char *s, *token;
int ret;
int peer_id, vector;
memset(buf, 0, sizeof(buf));
ret = read(0, buf, sizeof(buf) - 1);
if (ret < 0) {
return -1;
}
s = buf;
while ((token = strsep(&s, "\n\r;")) != NULL) {
if (!strcmp(token, "")) {
continue;
}
if (!strcmp(token, "?")) {
ivshmem_client_cmdline_help();
}
if (!strcmp(token, "help")) {
ivshmem_client_cmdline_help();
} else if (!strcmp(token, "dump")) {
ivshmem_client_dump(client);
} else if (!strcmp(token, "int all")) {
ivshmem_client_notify_broadcast(client);
} else if (sscanf(token, "int %d %d", &peer_id, &vector) == 2) {
peer = ivshmem_client_search_peer(client, peer_id);
if (peer == NULL) {
printf("cannot find peer_id = %d\n", peer_id);
continue;
}
ivshmem_client_notify(client, peer, vector);
} else if (sscanf(token, "int %d all", &peer_id) == 1) {
peer = ivshmem_client_search_peer(client, peer_id);
if (peer == NULL) {
printf("cannot find peer_id = %d\n", peer_id);
continue;
}
ivshmem_client_notify_all_vects(client, peer);
} else {
printf("invalid command, type help\n");
}
}
printf("cmd> ");
fflush(stdout);
return 0;
}
/* listen on stdin (command line), on unix socket (notifications of new
* and dead peers), and on eventfd (IRQ request) */
static int
ivshmem_client_poll_events(IvshmemClient *client)
{
fd_set fds;
int ret, maxfd;
while (1) {
FD_ZERO(&fds);
FD_SET(0, &fds); /* add stdin in fd_set */
maxfd = 1;
ivshmem_client_get_fds(client, &fds, &maxfd);
ret = select(maxfd, &fds, NULL, NULL, NULL);
if (ret < 0) {
if (errno == EINTR) {
continue;
}
fprintf(stderr, "select error: %s\n", strerror(errno));
break;
}
if (ret == 0) {
continue;
}
if (FD_ISSET(0, &fds) &&
ivshmem_client_handle_stdin_command(client) < 0 && errno != EINTR) {
fprintf(stderr, "ivshmem_client_handle_stdin_command() failed\n");
break;
}
if (ivshmem_client_handle_fds(client, &fds, maxfd) < 0) {
fprintf(stderr, "ivshmem_client_handle_fds() failed\n");
break;
}
}
return ret;
}
/* callback when we receive a notification (just display it) */
static void
ivshmem_client_notification_cb(const IvshmemClient *client,
const IvshmemClientPeer *peer,
unsigned vect, void *arg)
{
(void)client;
(void)arg;
printf("receive notification from peer_id=%" PRId64 " vector=%u\n",
peer->id, vect);
}
int
main(int argc, char *argv[])
{
struct sigaction sa;
IvshmemClient client;
IvshmemClientArgs args = {
.verbose = IVSHMEM_CLIENT_DEFAULT_VERBOSE,
.unix_sock_path = IVSHMEM_CLIENT_DEFAULT_UNIX_SOCK_PATH,
};
/* parse arguments, will exit on error */
ivshmem_client_parse_args(&args, argc, argv);
/* Ignore SIGPIPE, see this link for more info:
* http://www.mail-archive.com/libevent-users@monkey.org/msg01606.html */
sa.sa_handler = SIG_IGN;
sa.sa_flags = 0;
if (sigemptyset(&sa.sa_mask) == -1 ||
sigaction(SIGPIPE, &sa, 0) == -1) {
perror("failed to ignore SIGPIPE; sigaction");
return 1;
}
ivshmem_client_cmdline_help();
printf("cmd> ");
fflush(stdout);
if (ivshmem_client_init(&client, args.unix_sock_path,
ivshmem_client_notification_cb, NULL,
args.verbose) < 0) {
fprintf(stderr, "cannot init client\n");
return 1;
}
while (1) {
if (ivshmem_client_connect(&client) < 0) {
fprintf(stderr, "cannot connect to server, retry in 1 second\n");
sleep(1);
continue;
}
fprintf(stdout, "listen on server socket %d\n", client.sock_fd);
if (ivshmem_client_poll_events(&client) == 0) {
continue;
}
/* disconnected from server, reset all peers */
fprintf(stdout, "disconnected from server\n");
ivshmem_client_close(&client);
}
return 0;
}
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