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Diffstat (limited to 'qemu/contrib/ivshmem-client/main.c')
| -rw-r--r-- | qemu/contrib/ivshmem-client/main.c | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/qemu/contrib/ivshmem-client/main.c b/qemu/contrib/ivshmem-client/main.c new file mode 100644 index 000000000..33ae1daa1 --- /dev/null +++ b/qemu/contrib/ivshmem-client/main.c @@ -0,0 +1,241 @@ +/* + * 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; +} |