diff options
Diffstat (limited to 'qemu/contrib/ivshmem-server')
| -rw-r--r-- | qemu/contrib/ivshmem-server/Makefile.objs | 1 | ||||
| -rw-r--r-- | qemu/contrib/ivshmem-server/ivshmem-server.c | 457 | ||||
| -rw-r--r-- | qemu/contrib/ivshmem-server/ivshmem-server.h | 166 | ||||
| -rw-r--r-- | qemu/contrib/ivshmem-server/main.c | 273 |
4 files changed, 897 insertions, 0 deletions
diff --git a/qemu/contrib/ivshmem-server/Makefile.objs b/qemu/contrib/ivshmem-server/Makefile.objs new file mode 100644 index 000000000..c060dd369 --- /dev/null +++ b/qemu/contrib/ivshmem-server/Makefile.objs @@ -0,0 +1 @@ +ivshmem-server-obj-y = ivshmem-server.o main.o diff --git a/qemu/contrib/ivshmem-server/ivshmem-server.c b/qemu/contrib/ivshmem-server/ivshmem-server.c new file mode 100644 index 000000000..172db78b3 --- /dev/null +++ b/qemu/contrib/ivshmem-server/ivshmem-server.c @@ -0,0 +1,457 @@ +/* + * 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 "qemu/sockets.h" + +#include <sys/mman.h> +#include <sys/socket.h> +#include <sys/un.h> + +#include "ivshmem-server.h" + +/* log a message on stdout if verbose=1 */ +#define IVSHMEM_SERVER_DEBUG(server, fmt, ...) do { \ + if ((server)->verbose) { \ + printf(fmt, ## __VA_ARGS__); \ + } \ + } while (0) + +/** maximum size of a huge page, used by ivshmem_server_ftruncate() */ +#define IVSHMEM_SERVER_MAX_HUGEPAGE_SIZE (1024 * 1024 * 1024) + +/** default listen backlog (number of sockets not accepted) */ +#define IVSHMEM_SERVER_LISTEN_BACKLOG 10 + +/* send message to a client unix socket */ +static int +ivshmem_server_send_one_msg(int sock_fd, int64_t peer_id, int fd) +{ + int ret; + struct msghdr msg; + struct iovec iov[1]; + union { + struct cmsghdr cmsg; + char control[CMSG_SPACE(sizeof(int))]; + } msg_control; + struct cmsghdr *cmsg; + + peer_id = GINT64_TO_LE(peer_id); + iov[0].iov_base = &peer_id; + iov[0].iov_len = sizeof(peer_id); + + memset(&msg, 0, sizeof(msg)); + msg.msg_iov = iov; + msg.msg_iovlen = 1; + + /* if fd is specified, add it in a cmsg */ + if (fd >= 0) { + memset(&msg_control, 0, sizeof(msg_control)); + msg.msg_control = &msg_control; + msg.msg_controllen = sizeof(msg_control); + cmsg = CMSG_FIRSTHDR(&msg); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + cmsg->cmsg_len = CMSG_LEN(sizeof(int)); + memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd)); + } + + ret = sendmsg(sock_fd, &msg, 0); + if (ret <= 0) { + return -1; + } + + return 0; +} + +/* free a peer when the server advertises a disconnection or when the + * server is freed */ +static void +ivshmem_server_free_peer(IvshmemServer *server, IvshmemServerPeer *peer) +{ + unsigned vector; + IvshmemServerPeer *other_peer; + + IVSHMEM_SERVER_DEBUG(server, "free peer %" PRId64 "\n", peer->id); + close(peer->sock_fd); + QTAILQ_REMOVE(&server->peer_list, peer, next); + + /* advertise the deletion to other peers */ + QTAILQ_FOREACH(other_peer, &server->peer_list, next) { + ivshmem_server_send_one_msg(other_peer->sock_fd, peer->id, -1); + } + + for (vector = 0; vector < peer->vectors_count; vector++) { + event_notifier_cleanup(&peer->vectors[vector]); + } + + g_free(peer); +} + +/* send the peer id and the shm_fd just after a new client connection */ +static int +ivshmem_server_send_initial_info(IvshmemServer *server, IvshmemServerPeer *peer) +{ + int ret; + + /* send our protocol version first */ + ret = ivshmem_server_send_one_msg(peer->sock_fd, IVSHMEM_PROTOCOL_VERSION, + -1); + if (ret < 0) { + IVSHMEM_SERVER_DEBUG(server, "cannot send version: %s\n", + strerror(errno)); + return -1; + } + + /* send the peer id to the client */ + ret = ivshmem_server_send_one_msg(peer->sock_fd, peer->id, -1); + if (ret < 0) { + IVSHMEM_SERVER_DEBUG(server, "cannot send peer id: %s\n", + strerror(errno)); + return -1; + } + + /* send the shm_fd */ + ret = ivshmem_server_send_one_msg(peer->sock_fd, -1, server->shm_fd); + if (ret < 0) { + IVSHMEM_SERVER_DEBUG(server, "cannot send shm fd: %s\n", + strerror(errno)); + return -1; + } + + return 0; +} + +/* handle message on listening unix socket (new client connection) */ +static int +ivshmem_server_handle_new_conn(IvshmemServer *server) +{ + IvshmemServerPeer *peer, *other_peer; + struct sockaddr_un unaddr; + socklen_t unaddr_len; + int newfd; + unsigned i; + + /* accept the incoming connection */ + unaddr_len = sizeof(unaddr); + newfd = qemu_accept(server->sock_fd, + (struct sockaddr *)&unaddr, &unaddr_len); + + if (newfd < 0) { + IVSHMEM_SERVER_DEBUG(server, "cannot accept() %s\n", strerror(errno)); + return -1; + } + + qemu_set_nonblock(newfd); + IVSHMEM_SERVER_DEBUG(server, "accept()=%d\n", newfd); + + /* allocate new structure for this peer */ + peer = g_malloc0(sizeof(*peer)); + peer->sock_fd = newfd; + + /* get an unused peer id */ + /* XXX: this could use id allocation such as Linux IDA, or simply + * a free-list */ + for (i = 0; i < G_MAXUINT16; i++) { + if (ivshmem_server_search_peer(server, server->cur_id) == NULL) { + break; + } + server->cur_id++; + } + if (i == G_MAXUINT16) { + IVSHMEM_SERVER_DEBUG(server, "cannot allocate new client id\n"); + close(newfd); + g_free(peer); + return -1; + } + peer->id = server->cur_id++; + + /* create eventfd, one per vector */ + peer->vectors_count = server->n_vectors; + for (i = 0; i < peer->vectors_count; i++) { + if (event_notifier_init(&peer->vectors[i], FALSE) < 0) { + IVSHMEM_SERVER_DEBUG(server, "cannot create eventfd\n"); + goto fail; + } + } + + /* send peer id and shm fd */ + if (ivshmem_server_send_initial_info(server, peer) < 0) { + IVSHMEM_SERVER_DEBUG(server, "cannot send initial info\n"); + goto fail; + } + + /* advertise the new peer to others */ + QTAILQ_FOREACH(other_peer, &server->peer_list, next) { + for (i = 0; i < peer->vectors_count; i++) { + ivshmem_server_send_one_msg(other_peer->sock_fd, peer->id, + peer->vectors[i].wfd); + } + } + + /* advertise the other peers to the new one */ + QTAILQ_FOREACH(other_peer, &server->peer_list, next) { + for (i = 0; i < peer->vectors_count; i++) { + ivshmem_server_send_one_msg(peer->sock_fd, other_peer->id, + other_peer->vectors[i].wfd); + } + } + + /* advertise the new peer to itself */ + for (i = 0; i < peer->vectors_count; i++) { + ivshmem_server_send_one_msg(peer->sock_fd, peer->id, + event_notifier_get_fd(&peer->vectors[i])); + } + + QTAILQ_INSERT_TAIL(&server->peer_list, peer, next); + IVSHMEM_SERVER_DEBUG(server, "new peer id = %" PRId64 "\n", + peer->id); + return 0; + +fail: + while (i--) { + event_notifier_cleanup(&peer->vectors[i]); + } + close(newfd); + g_free(peer); + return -1; +} + +/* Try to ftruncate a file to next power of 2 of shmsize. + * If it fails; all power of 2 above shmsize are tested until + * we reach the maximum huge page size. This is useful + * if the shm file is in a hugetlbfs that cannot be truncated to the + * shm_size value. */ +static int +ivshmem_server_ftruncate(int fd, unsigned shmsize) +{ + int ret; + struct stat mapstat; + + /* align shmsize to next power of 2 */ + shmsize = pow2ceil(shmsize); + + if (fstat(fd, &mapstat) != -1 && mapstat.st_size == shmsize) { + return 0; + } + + while (shmsize <= IVSHMEM_SERVER_MAX_HUGEPAGE_SIZE) { + ret = ftruncate(fd, shmsize); + if (ret == 0) { + return ret; + } + shmsize *= 2; + } + + return -1; +} + +/* Init a new ivshmem server */ +int +ivshmem_server_init(IvshmemServer *server, const char *unix_sock_path, + const char *shm_path, bool use_shm_open, + size_t shm_size, unsigned n_vectors, + bool verbose) +{ + int ret; + + memset(server, 0, sizeof(*server)); + server->verbose = verbose; + + ret = snprintf(server->unix_sock_path, sizeof(server->unix_sock_path), + "%s", unix_sock_path); + if (ret < 0 || ret >= sizeof(server->unix_sock_path)) { + IVSHMEM_SERVER_DEBUG(server, "could not copy unix socket path\n"); + return -1; + } + ret = snprintf(server->shm_path, sizeof(server->shm_path), + "%s", shm_path); + if (ret < 0 || ret >= sizeof(server->shm_path)) { + IVSHMEM_SERVER_DEBUG(server, "could not copy shm path\n"); + return -1; + } + + server->use_shm_open = use_shm_open; + server->shm_size = shm_size; + server->n_vectors = n_vectors; + + QTAILQ_INIT(&server->peer_list); + + return 0; +} + +/* open shm, create and bind to the unix socket */ +int +ivshmem_server_start(IvshmemServer *server) +{ + struct sockaddr_un sun; + int shm_fd, sock_fd, ret; + + /* open shm file */ + if (server->use_shm_open) { + IVSHMEM_SERVER_DEBUG(server, "Using POSIX shared memory: %s\n", + server->shm_path); + shm_fd = shm_open(server->shm_path, O_CREAT | O_RDWR, S_IRWXU); + } else { + gchar *filename = g_strdup_printf("%s/ivshmem.XXXXXX", server->shm_path); + IVSHMEM_SERVER_DEBUG(server, "Using file-backed shared memory: %s\n", + server->shm_path); + shm_fd = mkstemp(filename); + unlink(filename); + g_free(filename); + } + + if (shm_fd < 0) { + fprintf(stderr, "cannot open shm file %s: %s\n", server->shm_path, + strerror(errno)); + return -1; + } + if (ivshmem_server_ftruncate(shm_fd, server->shm_size) < 0) { + fprintf(stderr, "ftruncate(%s) failed: %s\n", server->shm_path, + strerror(errno)); + goto err_close_shm; + } + + IVSHMEM_SERVER_DEBUG(server, "create & bind socket %s\n", + server->unix_sock_path); + + /* create the unix listening socket */ + sock_fd = socket(AF_UNIX, SOCK_STREAM, 0); + if (sock_fd < 0) { + IVSHMEM_SERVER_DEBUG(server, "cannot create socket: %s\n", + strerror(errno)); + goto err_close_shm; + } + + sun.sun_family = AF_UNIX; + ret = snprintf(sun.sun_path, sizeof(sun.sun_path), "%s", + server->unix_sock_path); + if (ret < 0 || ret >= sizeof(sun.sun_path)) { + IVSHMEM_SERVER_DEBUG(server, "could not copy unix socket path\n"); + goto err_close_sock; + } + if (bind(sock_fd, (struct sockaddr *)&sun, sizeof(sun)) < 0) { + IVSHMEM_SERVER_DEBUG(server, "cannot connect to %s: %s\n", sun.sun_path, + strerror(errno)); + goto err_close_sock; + } + + if (listen(sock_fd, IVSHMEM_SERVER_LISTEN_BACKLOG) < 0) { + IVSHMEM_SERVER_DEBUG(server, "listen() failed: %s\n", strerror(errno)); + goto err_close_sock; + } + + server->sock_fd = sock_fd; + server->shm_fd = shm_fd; + + return 0; + +err_close_sock: + close(sock_fd); +err_close_shm: + close(shm_fd); + return -1; +} + +/* close connections to clients, the unix socket and the shm fd */ +void +ivshmem_server_close(IvshmemServer *server) +{ + IvshmemServerPeer *peer, *npeer; + + IVSHMEM_SERVER_DEBUG(server, "close server\n"); + + QTAILQ_FOREACH_SAFE(peer, &server->peer_list, next, npeer) { + ivshmem_server_free_peer(server, peer); + } + + unlink(server->unix_sock_path); + close(server->sock_fd); + close(server->shm_fd); + server->sock_fd = -1; + server->shm_fd = -1; +} + +/* get the fd_set according to the unix socket and the peer list */ +void +ivshmem_server_get_fds(const IvshmemServer *server, fd_set *fds, int *maxfd) +{ + IvshmemServerPeer *peer; + + if (server->sock_fd == -1) { + return; + } + + FD_SET(server->sock_fd, fds); + if (server->sock_fd >= *maxfd) { + *maxfd = server->sock_fd + 1; + } + + QTAILQ_FOREACH(peer, &server->peer_list, next) { + FD_SET(peer->sock_fd, fds); + if (peer->sock_fd >= *maxfd) { + *maxfd = peer->sock_fd + 1; + } + } +} + +/* process incoming messages on the sockets in fd_set */ +int +ivshmem_server_handle_fds(IvshmemServer *server, fd_set *fds, int maxfd) +{ + IvshmemServerPeer *peer, *peer_next; + + if (server->sock_fd < maxfd && FD_ISSET(server->sock_fd, fds) && + ivshmem_server_handle_new_conn(server) < 0 && errno != EINTR) { + IVSHMEM_SERVER_DEBUG(server, "ivshmem_server_handle_new_conn() " + "failed\n"); + return -1; + } + + QTAILQ_FOREACH_SAFE(peer, &server->peer_list, next, peer_next) { + /* any message from a peer socket result in a close() */ + IVSHMEM_SERVER_DEBUG(server, "peer->sock_fd=%d\n", peer->sock_fd); + if (peer->sock_fd < maxfd && FD_ISSET(peer->sock_fd, fds)) { + ivshmem_server_free_peer(server, peer); + } + } + + return 0; +} + +/* lookup peer from its id */ +IvshmemServerPeer * +ivshmem_server_search_peer(IvshmemServer *server, int64_t peer_id) +{ + IvshmemServerPeer *peer; + + QTAILQ_FOREACH(peer, &server->peer_list, next) { + if (peer->id == peer_id) { + return peer; + } + } + return NULL; +} + +/* dump our info, the list of peers their vectors on stdout */ +void +ivshmem_server_dump(const IvshmemServer *server) +{ + const IvshmemServerPeer *peer; + unsigned vector; + + /* dump peers */ + QTAILQ_FOREACH(peer, &server->peer_list, next) { + printf("peer_id = %" PRId64 "\n", peer->id); + + for (vector = 0; vector < peer->vectors_count; vector++) { + printf(" vector %d is enabled (fd=%d)\n", vector, + event_notifier_get_fd(&peer->vectors[vector])); + } + } +} diff --git a/qemu/contrib/ivshmem-server/ivshmem-server.h b/qemu/contrib/ivshmem-server/ivshmem-server.h new file mode 100644 index 000000000..385163961 --- /dev/null +++ b/qemu/contrib/ivshmem-server/ivshmem-server.h @@ -0,0 +1,166 @@ +/* + * 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. + */ + +#ifndef _IVSHMEM_SERVER_H_ +#define _IVSHMEM_SERVER_H_ + +/** + * The ivshmem server is a daemon that creates a unix socket in listen + * mode. The ivshmem clients (qemu or ivshmem-client) connect to this + * unix socket. For each client, the server will create some eventfd + * (see EVENTFD(2)), one per vector. These fd are transmitted to all + * clients using the SCM_RIGHTS cmsg message. Therefore, each client is + * able to send a notification to another client without beeing + * "profixied" by the server. + * + * We use this mechanism to send interruptions between guests. + * qemu is able to transform an event on a eventfd into a PCI MSI-x + * interruption in the guest. + * + * The ivshmem server is also able to share the file descriptor + * associated to the ivshmem shared memory. + */ + +#include <sys/select.h> + +#include "qemu/event_notifier.h" +#include "qemu/queue.h" +#include "hw/misc/ivshmem.h" + +/** + * Maximum number of notification vectors supported by the server + */ +#define IVSHMEM_SERVER_MAX_VECTORS 64 + +/** + * Structure storing a peer + * + * Each time a client connects to an ivshmem server, a new + * IvshmemServerPeer structure is created. This peer and all its + * vectors are advertised to all connected clients through the connected + * unix sockets. + */ +typedef struct IvshmemServerPeer { + QTAILQ_ENTRY(IvshmemServerPeer) next; /**< next in list*/ + int sock_fd; /**< connected unix sock */ + int64_t id; /**< the id of the peer */ + EventNotifier vectors[IVSHMEM_SERVER_MAX_VECTORS]; /**< one per vector */ + unsigned vectors_count; /**< number of vectors */ +} IvshmemServerPeer; +QTAILQ_HEAD(IvshmemServerPeerList, IvshmemServerPeer); + +typedef struct IvshmemServerPeerList IvshmemServerPeerList; + +/** + * Structure describing an ivshmem server + * + * This structure stores all information related to our server: the name + * of the server unix socket and the list of connected peers. + */ +typedef struct IvshmemServer { + char unix_sock_path[PATH_MAX]; /**< path to unix socket */ + int sock_fd; /**< unix sock file descriptor */ + char shm_path[PATH_MAX]; /**< path to shm */ + bool use_shm_open; + size_t shm_size; /**< size of shm */ + int shm_fd; /**< shm file descriptor */ + unsigned n_vectors; /**< number of vectors */ + uint16_t cur_id; /**< id to be given to next client */ + bool verbose; /**< true in verbose mode */ + IvshmemServerPeerList peer_list; /**< list of peers */ +} IvshmemServer; + +/** + * Initialize an ivshmem server + * + * @server: A pointer to an uninitialized IvshmemServer structure + * @unix_sock_path: The pointer to the unix socket file name + * @shm_path: Path to the shared memory. The path corresponds to a POSIX + * shm name or a hugetlbfs mount point. + * @shm_size: Size of shared memory + * @n_vectors: Number of interrupt vectors per client + * @verbose: True to enable verbose mode + * + * Returns: 0 on success, or a negative value on error + */ +int +ivshmem_server_init(IvshmemServer *server, const char *unix_sock_path, + const char *shm_path, bool use_shm_open, + size_t shm_size, unsigned n_vectors, + bool verbose); + +/** + * Open the shm, then create and bind to the unix socket + * + * @server: The pointer to the initialized IvshmemServer structure + * + * Returns: 0 on success, or a negative value on error + */ +int ivshmem_server_start(IvshmemServer *server); + +/** + * Close the server + * + * Close connections to all clients, close the unix socket and the + * shared memory file descriptor. The structure remains initialized, so + * it is possible to call ivshmem_server_start() again after a call to + * ivshmem_server_close(). + * + * @server: The ivshmem server + */ +void ivshmem_server_close(IvshmemServer *server); + +/** + * Fill a fd_set with file descriptors to be monitored + * + * This function will fill a fd_set with all file descriptors that must + * be polled (unix server socket and peers unix socket). The function + * will not initialize the fd_set, it is up to the caller to do it. + * + * @server: The ivshmem server + * @fds: The fd_set to be updated + * @maxfd: Must be set to the max file descriptor + 1 in fd_set. This value is + * updated if this function adds a greater fd in fd_set. + */ +void +ivshmem_server_get_fds(const IvshmemServer *server, fd_set *fds, int *maxfd); + +/** + * Read and handle new messages + * + * Given a fd_set (for instance filled by a call to select()), handle + * incoming messages from peers. + * + * @server: The ivshmem server + * @fds: The fd_set containing the file descriptors to be checked. Note that + * file descriptors that are not related to our server are ignored. + * @maxfd: The maximum fd in fd_set, plus one. + * + * Returns: 0 on success, or a negative value on error + */ +int ivshmem_server_handle_fds(IvshmemServer *server, fd_set *fds, int maxfd); + +/** + * Search a peer from its identifier + * + * @server: The ivshmem server + * @peer_id: The identifier of the peer structure + * + * Returns: The peer structure, or NULL if not found + */ +IvshmemServerPeer * +ivshmem_server_search_peer(IvshmemServer *server, int64_t peer_id); + +/** + * Dump information of this ivshmem server and its peers on stdout + * + * @server: The ivshmem server + */ +void ivshmem_server_dump(const IvshmemServer *server); + +#endif /* _IVSHMEM_SERVER_H_ */ diff --git a/qemu/contrib/ivshmem-server/main.c b/qemu/contrib/ivshmem-server/main.c new file mode 100644 index 000000000..45776d8af --- /dev/null +++ b/qemu/contrib/ivshmem-server/main.c @@ -0,0 +1,273 @@ +/* + * 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 "qapi/error.h" +#include "qemu/cutils.h" + +#include "ivshmem-server.h" + +#define IVSHMEM_SERVER_DEFAULT_VERBOSE 0 +#define IVSHMEM_SERVER_DEFAULT_FOREGROUND 0 +#define IVSHMEM_SERVER_DEFAULT_PID_FILE "/var/run/ivshmem-server.pid" +#define IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH "/tmp/ivshmem_socket" +#define IVSHMEM_SERVER_DEFAULT_SHM_PATH "ivshmem" +#define IVSHMEM_SERVER_DEFAULT_SHM_SIZE (4*1024*1024) +#define IVSHMEM_SERVER_DEFAULT_N_VECTORS 1 + +/* used to quit on signal SIGTERM */ +static int ivshmem_server_quit; + +/* arguments given by the user */ +typedef struct IvshmemServerArgs { + bool verbose; + bool foreground; + const char *pid_file; + const char *unix_socket_path; + const char *shm_path; + bool use_shm_open; + uint64_t shm_size; + unsigned n_vectors; +} IvshmemServerArgs; + +static void +ivshmem_server_usage(const char *progname) +{ + printf("Usage: %s [OPTION]...\n" + " -h: show this help\n" + " -v: verbose mode\n" + " -F: foreground mode (default is to daemonize)\n" + " -p <pid-file>: path to the PID file (used in daemon mode only)\n" + " default " IVSHMEM_SERVER_DEFAULT_PID_FILE "\n" + " -S <unix-socket-path>: path to the unix socket to listen to\n" + " default " IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH "\n" + " -M <shm-name>: POSIX shared memory object to use\n" + " default " IVSHMEM_SERVER_DEFAULT_SHM_PATH "\n" + " -m <dir-name>: where to create shared memory\n" + " -l <size>: size of shared memory in bytes\n" + " suffixes K, M and G can be used, e.g. 1K means 1024\n" + " default %u\n" + " -n <nvectors>: number of vectors\n" + " default %u\n", + progname, IVSHMEM_SERVER_DEFAULT_SHM_SIZE, + IVSHMEM_SERVER_DEFAULT_N_VECTORS); +} + +static void +ivshmem_server_help(const char *progname) +{ + fprintf(stderr, "Try '%s -h' for more information.\n", progname); +} + +/* parse the program arguments, exit on error */ +static void +ivshmem_server_parse_args(IvshmemServerArgs *args, int argc, char *argv[]) +{ + int c; + unsigned long long v; + Error *err = NULL; + + while ((c = getopt(argc, argv, "hvFp:S:m:M:l:n:")) != -1) { + + switch (c) { + case 'h': /* help */ + ivshmem_server_usage(argv[0]); + exit(0); + break; + + case 'v': /* verbose */ + args->verbose = 1; + break; + + case 'F': /* foreground */ + args->foreground = 1; + break; + + case 'p': /* pid file */ + args->pid_file = optarg; + break; + + case 'S': /* unix socket path */ + args->unix_socket_path = optarg; + break; + + case 'M': /* shm name */ + case 'm': /* dir name */ + args->shm_path = optarg; + args->use_shm_open = c == 'M'; + break; + + case 'l': /* shm size */ + parse_option_size("shm_size", optarg, &args->shm_size, &err); + if (err) { + error_report_err(err); + ivshmem_server_help(argv[0]); + exit(1); + } + break; + + case 'n': /* number of vectors */ + if (parse_uint_full(optarg, &v, 0) < 0) { + fprintf(stderr, "cannot parse n_vectors\n"); + ivshmem_server_help(argv[0]); + exit(1); + } + args->n_vectors = v; + break; + + default: + ivshmem_server_usage(argv[0]); + exit(1); + break; + } + } + + if (args->n_vectors > IVSHMEM_SERVER_MAX_VECTORS) { + fprintf(stderr, "too many requested vectors (max is %d)\n", + IVSHMEM_SERVER_MAX_VECTORS); + ivshmem_server_help(argv[0]); + exit(1); + } + + if (args->verbose == 1 && args->foreground == 0) { + fprintf(stderr, "cannot use verbose in daemon mode\n"); + ivshmem_server_help(argv[0]); + exit(1); + } +} + +/* wait for events on listening server unix socket and connected client + * sockets */ +static int +ivshmem_server_poll_events(IvshmemServer *server) +{ + fd_set fds; + int ret = 0, maxfd; + + while (!ivshmem_server_quit) { + + FD_ZERO(&fds); + maxfd = 0; + ivshmem_server_get_fds(server, &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 (ivshmem_server_handle_fds(server, &fds, maxfd) < 0) { + fprintf(stderr, "ivshmem_server_handle_fds() failed\n"); + break; + } + } + + return ret; +} + +static void +ivshmem_server_quit_cb(int signum) +{ + ivshmem_server_quit = 1; +} + +int +main(int argc, char *argv[]) +{ + IvshmemServer server; + struct sigaction sa, sa_quit; + IvshmemServerArgs args = { + .verbose = IVSHMEM_SERVER_DEFAULT_VERBOSE, + .foreground = IVSHMEM_SERVER_DEFAULT_FOREGROUND, + .pid_file = IVSHMEM_SERVER_DEFAULT_PID_FILE, + .unix_socket_path = IVSHMEM_SERVER_DEFAULT_UNIX_SOCK_PATH, + .shm_path = IVSHMEM_SERVER_DEFAULT_SHM_PATH, + .use_shm_open = true, + .shm_size = IVSHMEM_SERVER_DEFAULT_SHM_SIZE, + .n_vectors = IVSHMEM_SERVER_DEFAULT_N_VECTORS, + }; + int ret = 1; + + /* + * Do not remove this notice without adding proper error handling! + * Start with handling ivshmem_server_send_one_msg() failure. + */ + printf("*** Example code, do not use in production ***\n"); + + /* parse arguments, will exit on error */ + ivshmem_server_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"); + goto err; + } + + sa_quit.sa_handler = ivshmem_server_quit_cb; + sa_quit.sa_flags = 0; + if (sigemptyset(&sa_quit.sa_mask) == -1 || + sigaction(SIGTERM, &sa_quit, 0) == -1) { + perror("failed to add SIGTERM handler; sigaction"); + goto err; + } + + /* init the ivshms structure */ + if (ivshmem_server_init(&server, args.unix_socket_path, + args.shm_path, args.use_shm_open, + args.shm_size, args.n_vectors, args.verbose) < 0) { + fprintf(stderr, "cannot init server\n"); + goto err; + } + + /* start the ivshmem server (open shm & unix socket) */ + if (ivshmem_server_start(&server) < 0) { + fprintf(stderr, "cannot bind\n"); + goto err; + } + + /* daemonize if asked to */ + if (!args.foreground) { + FILE *fp; + + if (qemu_daemon(1, 1) < 0) { + fprintf(stderr, "cannot daemonize: %s\n", strerror(errno)); + goto err_close; + } + + /* write pid file */ + fp = fopen(args.pid_file, "w"); + if (fp == NULL) { + fprintf(stderr, "cannot write pid file: %s\n", strerror(errno)); + goto err_close; + } + + fprintf(fp, "%d\n", (int) getpid()); + fclose(fp); + } + + ivshmem_server_poll_events(&server); + fprintf(stdout, "server disconnected\n"); + ret = 0; + +err_close: + ivshmem_server_close(&server); +err: + return ret; +} |