X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust-comm%2Flttng-ust-comm.c;h=f9398e0d9891311ef2cdb3837905a4a67944c9ca;hb=HEAD;hp=5322702cfd6cd524dd5206a28a51ac3e4837a9cd;hpb=ebabbf580131acd1fe246c4d31fc5c044d36a038;p=lttng-ust.git diff --git a/liblttng-ust-comm/lttng-ust-comm.c b/liblttng-ust-comm/lttng-ust-comm.c deleted file mode 100644 index 5322702c..00000000 --- a/liblttng-ust-comm/lttng-ust-comm.c +++ /dev/null @@ -1,1896 +0,0 @@ -/* - * Copyright (C) 2011 - David Goulet - * Copyright (C) 2011-2013 - Mathieu Desnoyers - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; only - * version 2.1 of the License. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include - -#include "../liblttng-ust/compat.h" - -#define USTCOMM_CODE_OFFSET(code) \ - (code == LTTNG_UST_OK ? 0 : (code - LTTNG_UST_ERR + 1)) - -#define USTCOMM_MAX_SEND_FDS 4 - -static -ssize_t count_fields_recursive(size_t nr_fields, - const struct lttng_event_field *lttng_fields); -static -int serialize_one_field(struct lttng_session *session, - struct ustctl_field *fields, size_t *iter_output, - const struct lttng_event_field *lf); -static -int serialize_fields(struct lttng_session *session, - struct ustctl_field *ustctl_fields, - size_t *iter_output, size_t nr_lttng_fields, - const struct lttng_event_field *lttng_fields); - -/* - * Human readable error message. - */ -static const char *ustcomm_readable_code[] = { - [ USTCOMM_CODE_OFFSET(LTTNG_UST_OK) ] = "Success", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR) ] = "Unknown error", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOENT) ] = "No entry", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXIST) ] = "Object already exists", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL) ] = "Invalid argument", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_PERM) ] = "Permission denied", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_NOSYS) ] = "Not implemented", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_EXITING) ] = "Process is exiting", - - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_MAGIC) ] = "Invalid magic number", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_INVAL_SOCKET_TYPE) ] = "Invalid socket type", - [ USTCOMM_CODE_OFFSET(LTTNG_UST_ERR_UNSUP_MAJOR) ] = "Unsupported major version", -}; - -/* - * lttng_ust_strerror - * - * Receives positive error value. - * Return ptr to string representing a human readable - * error code from the ustcomm_return_code enum. - */ -const char *lttng_ust_strerror(int code) -{ - if (code == LTTNG_UST_OK) - return ustcomm_readable_code[USTCOMM_CODE_OFFSET(code)]; - if (code < LTTNG_UST_ERR) - return strerror(code); - if (code >= LTTNG_UST_ERR_NR) - code = LTTNG_UST_ERR; - return ustcomm_readable_code[USTCOMM_CODE_OFFSET(code)]; -} - -/* - * ustcomm_connect_unix_sock - * - * Connect to unix socket using the path name. - * - * Caller handles FD tracker. - */ -int ustcomm_connect_unix_sock(const char *pathname, long timeout) -{ - struct sockaddr_un sun; - int fd, ret; - - /* - * libust threads require the close-on-exec flag for all - * resources so it does not leak file descriptors upon exec. - * SOCK_CLOEXEC is not used since it is linux specific. - */ - fd = socket(PF_UNIX, SOCK_STREAM, 0); - if (fd < 0) { - PERROR("socket"); - ret = -errno; - goto error; - } - if (timeout >= 0) { - /* Give at least 10ms. */ - if (timeout < 10) - timeout = 10; - ret = ustcomm_setsockopt_snd_timeout(fd, timeout); - if (ret < 0) { - WARN("Error setting connect socket send timeout"); - } - } - ret = fcntl(fd, F_SETFD, FD_CLOEXEC); - if (ret < 0) { - PERROR("fcntl"); - ret = -errno; - goto error_fcntl; - } - - memset(&sun, 0, sizeof(sun)); - sun.sun_family = AF_UNIX; - strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); - sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; - - ret = connect(fd, (struct sockaddr *) &sun, sizeof(sun)); - if (ret < 0) { - /* - * Don't print message on connect ENOENT error, because - * connect is used in normal execution to detect if - * sessiond is alive. ENOENT is when the unix socket - * file does not exist, and ECONNREFUSED is when the - * file exists but no sessiond is listening. - */ - if (errno != ECONNREFUSED && errno != ECONNRESET - && errno != ENOENT && errno != EACCES) - PERROR("connect"); - ret = -errno; - if (ret == -ECONNREFUSED || ret == -ECONNRESET) - ret = -EPIPE; - goto error_connect; - } - - return fd; - -error_connect: -error_fcntl: - { - int closeret; - - closeret = close(fd); - if (closeret) - PERROR("close"); - } -error: - return ret; -} - -/* - * ustcomm_accept_unix_sock - * - * Do an accept(2) on the sock and return the - * new file descriptor. The socket MUST be bind(2) before. - */ -int ustcomm_accept_unix_sock(int sock) -{ - int new_fd; - struct sockaddr_un sun; - socklen_t len = 0; - - /* Blocking call */ - new_fd = accept(sock, (struct sockaddr *) &sun, &len); - if (new_fd < 0) { - if (errno != ECONNABORTED) - PERROR("accept"); - new_fd = -errno; - if (new_fd == -ECONNABORTED) - new_fd = -EPIPE; - } - return new_fd; -} - -/* - * ustcomm_create_unix_sock - * - * Creates a AF_UNIX local socket using pathname - * bind the socket upon creation and return the fd. - */ -int ustcomm_create_unix_sock(const char *pathname) -{ - struct sockaddr_un sun; - int fd, ret; - - /* Create server socket */ - if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) { - PERROR("socket"); - ret = -errno; - goto error; - } - - memset(&sun, 0, sizeof(sun)); - sun.sun_family = AF_UNIX; - strncpy(sun.sun_path, pathname, sizeof(sun.sun_path)); - sun.sun_path[sizeof(sun.sun_path) - 1] = '\0'; - - /* Unlink the old file if present */ - (void) unlink(pathname); - ret = bind(fd, (struct sockaddr *) &sun, sizeof(sun)); - if (ret < 0) { - PERROR("bind"); - ret = -errno; - goto error_close; - } - - return fd; - -error_close: - { - int closeret; - - closeret = close(fd); - if (closeret) { - PERROR("close"); - } - } -error: - return ret; -} - -/* - * ustcomm_listen_unix_sock - * - * Make the socket listen using LTTNG_UST_COMM_MAX_LISTEN. - */ -int ustcomm_listen_unix_sock(int sock) -{ - int ret; - - ret = listen(sock, LTTNG_UST_COMM_MAX_LISTEN); - if (ret < 0) { - ret = -errno; - PERROR("listen"); - } - - return ret; -} - -/* - * ustcomm_close_unix_sock - * - * Shutdown cleanly a unix socket. - * - * Handles fd tracker internally. - */ -int ustcomm_close_unix_sock(int sock) -{ - int ret; - - lttng_ust_lock_fd_tracker(); - ret = close(sock); - if (!ret) { - lttng_ust_delete_fd_from_tracker(sock); - } else { - PERROR("close"); - ret = -errno; - } - lttng_ust_unlock_fd_tracker(); - - return ret; -} - -/* - * ustcomm_recv_unix_sock - * - * Receive data of size len in put that data into - * the buf param. Using recvmsg API. - * Return the size of received data. - * Return 0 on orderly shutdown. - */ -ssize_t ustcomm_recv_unix_sock(int sock, void *buf, size_t len) -{ - struct msghdr msg; - struct iovec iov[1]; - ssize_t ret = -1; - size_t len_last; - - memset(&msg, 0, sizeof(msg)); - - iov[0].iov_base = buf; - iov[0].iov_len = len; - msg.msg_iov = iov; - msg.msg_iovlen = 1; - - do { - len_last = iov[0].iov_len; - ret = recvmsg(sock, &msg, 0); - if (ret > 0) { - iov[0].iov_base += ret; - iov[0].iov_len -= ret; - assert(ret <= len_last); - } - } while ((ret > 0 && ret < len_last) || (ret < 0 && errno == EINTR)); - - if (ret < 0) { - int shutret; - - if (errno != EPIPE && errno != ECONNRESET && errno != ECONNREFUSED) - PERROR("recvmsg"); - ret = -errno; - if (ret == -ECONNRESET || ret == -ECONNREFUSED) - ret = -EPIPE; - - shutret = shutdown(sock, SHUT_RDWR); - if (shutret) - ERR("Socket shutdown error"); - } else if (ret > 0) { - ret = len; - } - /* ret = 0 means an orderly shutdown. */ - - return ret; -} - -/* - * ustcomm_send_unix_sock - * - * Send buf data of size len. Using sendmsg API. - * Return the size of sent data. - */ -ssize_t ustcomm_send_unix_sock(int sock, const void *buf, size_t len) -{ - struct msghdr msg; - struct iovec iov[1]; - ssize_t ret; - - memset(&msg, 0, sizeof(msg)); - - iov[0].iov_base = (void *) buf; - iov[0].iov_len = len; - msg.msg_iov = iov; - msg.msg_iovlen = 1; - - /* - * Using the MSG_NOSIGNAL when sending data from sessiond to - * libust, so libust does not receive an unhandled SIGPIPE or - * SIGURG. The sessiond receiver side can be made more resilient - * by ignoring SIGPIPE, but we don't have this luxury on the - * libust side. - */ - do { - ret = sendmsg(sock, &msg, MSG_NOSIGNAL); - } while (ret < 0 && errno == EINTR); - - if (ret < 0) { - int shutret; - - if (errno != EPIPE && errno != ECONNRESET) - PERROR("sendmsg"); - ret = -errno; - if (ret == -ECONNRESET) - ret = -EPIPE; - - shutret = shutdown(sock, SHUT_RDWR); - if (shutret) - ERR("Socket shutdown error"); - } - - return ret; -} - -/* - * Send a message accompanied by fd(s) over a unix socket. - * - * Returns the size of data sent, or negative error value. - */ -ssize_t ustcomm_send_fds_unix_sock(int sock, int *fds, size_t nb_fd) -{ - struct msghdr msg; - struct cmsghdr *cmptr; - struct iovec iov[1]; - ssize_t ret = -1; - unsigned int sizeof_fds = nb_fd * sizeof(int); - char tmp[CMSG_SPACE(sizeof_fds)]; - char dummy = 0; - - memset(&msg, 0, sizeof(msg)); - memset(tmp, 0, CMSG_SPACE(sizeof_fds) * sizeof(char)); - - if (nb_fd > USTCOMM_MAX_SEND_FDS) - return -EINVAL; - - msg.msg_control = (caddr_t)tmp; - msg.msg_controllen = CMSG_LEN(sizeof_fds); - - cmptr = CMSG_FIRSTHDR(&msg); - if (!cmptr) - return -EINVAL; - cmptr->cmsg_level = SOL_SOCKET; - cmptr->cmsg_type = SCM_RIGHTS; - cmptr->cmsg_len = CMSG_LEN(sizeof_fds); - memcpy(CMSG_DATA(cmptr), fds, sizeof_fds); - /* Sum of the length of all control messages in the buffer: */ - msg.msg_controllen = cmptr->cmsg_len; - - iov[0].iov_base = &dummy; - iov[0].iov_len = 1; - msg.msg_iov = iov; - msg.msg_iovlen = 1; - - do { - ret = sendmsg(sock, &msg, MSG_NOSIGNAL); - } while (ret < 0 && errno == EINTR); - if (ret < 0) { - /* - * We consider EPIPE and ECONNRESET as expected. - */ - if (errno != EPIPE && errno != ECONNRESET) { - PERROR("sendmsg"); - } - ret = -errno; - if (ret == -ECONNRESET) - ret = -EPIPE; - } - return ret; -} - -/* - * Recv a message accompanied by fd(s) from a unix socket. - * - * Expect at most "nb_fd" file descriptors. Returns the number of fd - * actually received in nb_fd. - * Returns -EPIPE on orderly shutdown. - */ -ssize_t ustcomm_recv_fds_unix_sock(int sock, int *fds, size_t nb_fd) -{ - struct iovec iov[1]; - ssize_t ret = 0; - struct cmsghdr *cmsg; - size_t sizeof_fds = nb_fd * sizeof(int); - char recv_fd[CMSG_SPACE(sizeof_fds)]; - struct msghdr msg; - char dummy; - int i; - - memset(&msg, 0, sizeof(msg)); - - /* Prepare to receive the structures */ - iov[0].iov_base = &dummy; - iov[0].iov_len = 1; - msg.msg_iov = iov; - msg.msg_iovlen = 1; - msg.msg_control = recv_fd; - msg.msg_controllen = sizeof(recv_fd); - - do { - ret = recvmsg(sock, &msg, 0); - } while (ret < 0 && errno == EINTR); - if (ret < 0) { - if (errno != EPIPE && errno != ECONNRESET) { - PERROR("recvmsg fds"); - } - ret = -errno; - if (ret == -ECONNRESET) - ret = -EPIPE; - goto end; - } - if (ret == 0) { - /* orderly shutdown */ - ret = -EPIPE; - goto end; - } - if (ret != 1) { - ERR("Error: Received %zd bytes, expected %d\n", - ret, 1); - goto end; - } - if (msg.msg_flags & MSG_CTRUNC) { - ERR("Error: Control message truncated.\n"); - ret = -1; - goto end; - } - cmsg = CMSG_FIRSTHDR(&msg); - if (!cmsg) { - ERR("Error: Invalid control message header\n"); - ret = -1; - goto end; - } - if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) { - ERR("Didn't received any fd\n"); - ret = -1; - goto end; - } - if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) { - ERR("Error: Received %zu bytes of ancillary data, expected %zu\n", - (size_t) cmsg->cmsg_len, (size_t) CMSG_LEN(sizeof_fds)); - ret = -1; - goto end; - } - - memcpy(fds, CMSG_DATA(cmsg), sizeof_fds); - - /* Set FD_CLOEXEC */ - for (i = 0; i < nb_fd; i++) { - ret = fcntl(fds[i], F_SETFD, FD_CLOEXEC); - if (ret < 0) { - PERROR("fcntl failed to set FD_CLOEXEC on fd %d", - fds[i]); - } - } - - ret = nb_fd; -end: - return ret; -} - -int ustcomm_send_app_msg(int sock, struct ustcomm_ust_msg *lum) -{ - ssize_t len; - - len = ustcomm_send_unix_sock(sock, lum, sizeof(*lum)); - switch (len) { - case sizeof(*lum): - break; - default: - if (len < 0) { - return len; - } else { - ERR("incorrect message size: %zd\n", len); - return -EINVAL; - } - } - return 0; -} - -int ustcomm_recv_app_reply(int sock, struct ustcomm_ust_reply *lur, - uint32_t expected_handle, uint32_t expected_cmd) -{ - ssize_t len; - - memset(lur, 0, sizeof(*lur)); - len = ustcomm_recv_unix_sock(sock, lur, sizeof(*lur)); - switch (len) { - case 0: /* orderly shutdown */ - return -EPIPE; - case sizeof(*lur): - { - int err = 0; - - if (lur->handle != expected_handle) { - ERR("Unexpected result message handle: " - "expected: %u vs received: %u\n", - expected_handle, lur->handle); - err = 1; - } - if (lur->cmd != expected_cmd) { - ERR("Unexpected result message command " - "expected: %u vs received: %u\n", - expected_cmd, lur->cmd); - err = 1; - } - if (err) { - return -EINVAL; - } else { - return lur->ret_code; - } - } - default: - if (len >= 0) { - ERR("incorrect message size: %zd\n", len); - } - return len; - } -} - -int ustcomm_send_app_cmd(int sock, - struct ustcomm_ust_msg *lum, - struct ustcomm_ust_reply *lur) -{ - int ret; - - ret = ustcomm_send_app_msg(sock, lum); - if (ret) - return ret; - ret = ustcomm_recv_app_reply(sock, lur, lum->handle, lum->cmd); - if (ret > 0) - return -EIO; - return ret; -} - -/* - * chan_data is allocated internally if this function returns the - * expected var_len. - */ -ssize_t ustcomm_recv_channel_from_sessiond(int sock, - void **_chan_data, uint64_t var_len, - int *_wakeup_fd) -{ - void *chan_data; - ssize_t len, nr_fd; - int wakeup_fd, ret; - - if (var_len > LTTNG_UST_CHANNEL_DATA_MAX_LEN) { - len = -EINVAL; - goto error_check; - } - /* Receive variable length data */ - chan_data = zmalloc(var_len); - if (!chan_data) { - len = -ENOMEM; - goto error_alloc; - } - len = ustcomm_recv_unix_sock(sock, chan_data, var_len); - if (len != var_len) { - goto error_recv; - } - /* recv wakeup fd */ - lttng_ust_lock_fd_tracker(); - nr_fd = ustcomm_recv_fds_unix_sock(sock, &wakeup_fd, 1); - if (nr_fd <= 0) { - lttng_ust_unlock_fd_tracker(); - if (nr_fd < 0) { - len = nr_fd; - goto error_recv; - } else { - len = -EIO; - goto error_recv; - } - } - - ret = lttng_ust_add_fd_to_tracker(wakeup_fd); - if (ret < 0) { - ret = close(wakeup_fd); - if (ret) { - PERROR("close on wakeup_fd"); - } - len = -EIO; - lttng_ust_unlock_fd_tracker(); - goto error_recv; - } - - *_wakeup_fd = ret; - lttng_ust_unlock_fd_tracker(); - - *_chan_data = chan_data; - return len; - -error_recv: - free(chan_data); -error_alloc: -error_check: - return len; -} - -ssize_t ustcomm_recv_event_notifier_notif_fd_from_sessiond(int sock, - int *_event_notifier_notif_fd) -{ - ssize_t nr_fd; - int event_notifier_notif_fd, ret; - - /* Receive event_notifier notification fd */ - lttng_ust_lock_fd_tracker(); - nr_fd = ustcomm_recv_fds_unix_sock(sock, &event_notifier_notif_fd, 1); - if (nr_fd <= 0) { - lttng_ust_unlock_fd_tracker(); - if (nr_fd < 0) { - ret = nr_fd; - goto error; - } else { - ret = -EIO; - goto error; - } - } - - ret = lttng_ust_add_fd_to_tracker(event_notifier_notif_fd); - if (ret < 0) { - ret = close(event_notifier_notif_fd); - if (ret) { - PERROR("close on event_notifier notif fd"); - } - ret = -EIO; - lttng_ust_unlock_fd_tracker(); - goto error; - } - - *_event_notifier_notif_fd = ret; - lttng_ust_unlock_fd_tracker(); - - ret = nr_fd; - -error: - return ret; -} - -int ustcomm_recv_stream_from_sessiond(int sock, - uint64_t *memory_map_size, - int *shm_fd, int *wakeup_fd) -{ - ssize_t len; - int ret; - int fds[2]; - - /* recv shm fd and wakeup fd */ - lttng_ust_lock_fd_tracker(); - len = ustcomm_recv_fds_unix_sock(sock, fds, 2); - if (len <= 0) { - lttng_ust_unlock_fd_tracker(); - if (len < 0) { - ret = len; - goto error; - } else { - ret = -EIO; - goto error; - } - } - - ret = lttng_ust_add_fd_to_tracker(fds[0]); - if (ret < 0) { - ret = close(fds[0]); - if (ret) { - PERROR("close on received shm_fd"); - } - ret = -EIO; - lttng_ust_unlock_fd_tracker(); - goto error; - } - *shm_fd = ret; - - ret = lttng_ust_add_fd_to_tracker(fds[1]); - if (ret < 0) { - ret = close(*shm_fd); - if (ret) { - PERROR("close on shm_fd"); - } - *shm_fd = -1; - ret = close(fds[1]); - if (ret) { - PERROR("close on received wakeup_fd"); - } - ret = -EIO; - lttng_ust_unlock_fd_tracker(); - goto error; - } - *wakeup_fd = ret; - lttng_ust_unlock_fd_tracker(); - return 0; - -error: - return ret; -} - -ssize_t ustcomm_recv_counter_from_sessiond(int sock, - void **_counter_data, uint64_t var_len) -{ - void *counter_data; - ssize_t len; - - if (var_len > LTTNG_UST_COUNTER_DATA_MAX_LEN) { - len = -EINVAL; - goto error_check; - } - /* Receive variable length data */ - counter_data = zmalloc(var_len); - if (!counter_data) { - len = -ENOMEM; - goto error_alloc; - } - len = ustcomm_recv_unix_sock(sock, counter_data, var_len); - if (len != var_len) { - goto error_recv; - } - *_counter_data = counter_data; - return len; - -error_recv: - free(counter_data); -error_alloc: -error_check: - return len; -} - -int ustcomm_recv_counter_shm_from_sessiond(int sock, - int *shm_fd) -{ - ssize_t len; - int ret; - int fds[1]; - - /* recv shm fd fd */ - lttng_ust_lock_fd_tracker(); - len = ustcomm_recv_fds_unix_sock(sock, fds, 1); - if (len <= 0) { - lttng_ust_unlock_fd_tracker(); - if (len < 0) { - ret = len; - goto error; - } else { - ret = -EIO; - goto error; - } - } - - ret = lttng_ust_add_fd_to_tracker(fds[0]); - if (ret < 0) { - ret = close(fds[0]); - if (ret) { - PERROR("close on received shm_fd"); - } - ret = -EIO; - lttng_ust_unlock_fd_tracker(); - goto error; - } - *shm_fd = ret; - lttng_ust_unlock_fd_tracker(); - return 0; - -error: - return ret; -} - -/* - * Returns 0 on success, negative error value on error. - */ -int ustcomm_send_reg_msg(int sock, - enum ustctl_socket_type type, - uint32_t bits_per_long, - uint32_t uint8_t_alignment, - uint32_t uint16_t_alignment, - uint32_t uint32_t_alignment, - uint32_t uint64_t_alignment, - uint32_t long_alignment) -{ - ssize_t len; - struct ustctl_reg_msg reg_msg; - - reg_msg.magic = LTTNG_UST_COMM_MAGIC; - reg_msg.major = LTTNG_UST_ABI_MAJOR_VERSION; - reg_msg.minor = LTTNG_UST_ABI_MINOR_VERSION; - reg_msg.pid = getpid(); - reg_msg.ppid = getppid(); - reg_msg.uid = getuid(); - reg_msg.gid = getgid(); - reg_msg.bits_per_long = bits_per_long; - reg_msg.uint8_t_alignment = uint8_t_alignment; - reg_msg.uint16_t_alignment = uint16_t_alignment; - reg_msg.uint32_t_alignment = uint32_t_alignment; - reg_msg.uint64_t_alignment = uint64_t_alignment; - reg_msg.long_alignment = long_alignment; - reg_msg.socket_type = type; - lttng_pthread_getname_np(reg_msg.name, LTTNG_UST_ABI_PROCNAME_LEN); - memset(reg_msg.padding, 0, sizeof(reg_msg.padding)); - - len = ustcomm_send_unix_sock(sock, ®_msg, sizeof(reg_msg)); - if (len > 0 && len != sizeof(reg_msg)) - return -EIO; - if (len < 0) - return len; - return 0; -} - -static -ssize_t count_one_type(const struct lttng_type *lt) -{ - switch (lt->atype) { - case atype_integer: - case atype_float: - case atype_string: - case atype_enum: - case atype_array: - case atype_sequence: - return 1; - case atype_struct: - return count_fields_recursive(lt->u.legacy._struct.nr_fields, - lt->u.legacy._struct.fields) + 1; - case atype_enum_nestable: - return count_one_type(lt->u.enum_nestable.container_type) + 1; - case atype_array_nestable: - return count_one_type(lt->u.array_nestable.elem_type) + 1; - case atype_sequence_nestable: - return count_one_type(lt->u.sequence_nestable.elem_type) + 1; - case atype_struct_nestable: - return count_fields_recursive(lt->u.struct_nestable.nr_fields, - lt->u.struct_nestable.fields) + 1; - - case atype_dynamic: - { - const struct lttng_event_field *choices; - size_t nr_choices; - int ret; - - ret = lttng_ust_dynamic_type_choices(&nr_choices, - &choices); - if (ret) - return ret; - /* - * Two fields for enum, one field for variant, and - * one field per choice. - */ - return count_fields_recursive(nr_choices, choices) + 3; - } - - default: - return -EINVAL; - } - return 0; -} - -static -ssize_t count_fields_recursive(size_t nr_fields, - const struct lttng_event_field *lttng_fields) -{ - int i; - ssize_t ret, count = 0; - - for (i = 0; i < nr_fields; i++) { - const struct lttng_event_field *lf; - - lf = <tng_fields[i]; - /* skip 'nowrite' fields */ - if (lf->nowrite) - continue; - ret = count_one_type(&lf->type); - if (ret < 0) - return ret; /* error */ - count += ret; - } - return count; -} - -static -ssize_t count_ctx_fields_recursive(size_t nr_fields, - const struct lttng_ctx_field *lttng_fields) -{ - int i; - ssize_t ret, count = 0; - - for (i = 0; i < nr_fields; i++) { - const struct lttng_event_field *lf; - - lf = <tng_fields[i].event_field; - /* skip 'nowrite' fields */ - if (lf->nowrite) - continue; - ret = count_one_type(&lf->type); - if (ret < 0) - return ret; /* error */ - count += ret; - } - return count; -} - -static -int serialize_string_encoding(int32_t *ue, - enum lttng_string_encodings le) -{ - switch (le) { - case lttng_encode_none: - *ue = ustctl_encode_none; - break; - case lttng_encode_UTF8: - *ue = ustctl_encode_UTF8; - break; - case lttng_encode_ASCII: - *ue = ustctl_encode_ASCII; - break; - default: - return -EINVAL; - } - return 0; -} - -static -int serialize_integer_type(struct ustctl_integer_type *uit, - const struct lttng_integer_type *lit) -{ - int32_t encoding; - - uit->size = lit->size; - uit->signedness = lit->signedness; - uit->reverse_byte_order = lit->reverse_byte_order; - uit->base = lit->base; - if (serialize_string_encoding(&encoding, lit->encoding)) - return -EINVAL; - uit->encoding = encoding; - uit->alignment = lit->alignment; - return 0; -} - -static -int serialize_basic_type(struct lttng_session *session, - enum ustctl_abstract_types *uatype, - enum lttng_abstract_types atype, - union _ustctl_basic_type *ubt, - const union _lttng_basic_type *lbt) -{ - switch (atype) { - case atype_integer: - { - if (serialize_integer_type(&ubt->integer, &lbt->integer)) - return -EINVAL; - *uatype = ustctl_atype_integer; - break; - } - case atype_string: - { - int32_t encoding; - - if (serialize_string_encoding(&encoding, lbt->string.encoding)) - return -EINVAL; - ubt->string.encoding = encoding; - *uatype = ustctl_atype_string; - break; - } - case atype_float: - { - struct ustctl_float_type *uft; - const struct lttng_float_type *lft; - - uft = &ubt->_float; - lft = &lbt->_float; - uft->exp_dig = lft->exp_dig; - uft->mant_dig = lft->mant_dig; - uft->alignment = lft->alignment; - uft->reverse_byte_order = lft->reverse_byte_order; - *uatype = ustctl_atype_float; - break; - } - case atype_enum: - { - strncpy(ubt->enumeration.name, lbt->enumeration.desc->name, - LTTNG_UST_SYM_NAME_LEN); - ubt->enumeration.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - if (serialize_integer_type(&ubt->enumeration.container_type, - &lbt->enumeration.container_type)) - return -EINVAL; - if (session) { - const struct lttng_enum *_enum; - - _enum = lttng_ust_enum_get_from_desc(session, lbt->enumeration.desc); - if (!_enum) - return -EINVAL; - ubt->enumeration.id = _enum->id; - } else { - ubt->enumeration.id = -1ULL; - } - *uatype = ustctl_atype_enum; - break; - } - case atype_array: - case atype_array_nestable: - case atype_sequence: - case atype_sequence_nestable: - case atype_enum_nestable: - default: - return -EINVAL; - } - return 0; -} - -static -int serialize_dynamic_type(struct lttng_session *session, - struct ustctl_field *fields, size_t *iter_output, - const char *field_name) -{ - const struct lttng_event_field *choices; - char tag_field_name[LTTNG_UST_SYM_NAME_LEN]; - const struct lttng_type *tag_type; - const struct lttng_event_field *tag_field_generic; - struct lttng_event_field tag_field = { - .name = tag_field_name, - .nowrite = 0, - }; - struct ustctl_field *uf; - size_t nr_choices, i; - int ret; - - tag_field_generic = lttng_ust_dynamic_type_tag_field(); - tag_type = &tag_field_generic->type; - - /* Serialize enum field. */ - strncpy(tag_field_name, field_name, LTTNG_UST_SYM_NAME_LEN); - tag_field_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - strncat(tag_field_name, - "_tag", - LTTNG_UST_SYM_NAME_LEN - strlen(tag_field_name) - 1); - tag_field.type = *tag_type; - ret = serialize_one_field(session, fields, iter_output, - &tag_field); - if (ret) - return ret; - - /* Serialize variant field. */ - uf = &fields[*iter_output]; - ret = lttng_ust_dynamic_type_choices(&nr_choices, &choices); - if (ret) - return ret; - - strncpy(uf->name, field_name, LTTNG_UST_SYM_NAME_LEN); - uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - uf->type.atype = ustctl_atype_variant; - uf->type.u.variant_nestable.nr_choices = nr_choices; - strncpy(uf->type.u.variant_nestable.tag_name, - tag_field_name, - LTTNG_UST_SYM_NAME_LEN); - uf->type.u.variant_nestable.tag_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - uf->type.u.variant_nestable.alignment = 0; - (*iter_output)++; - - /* Serialize choice fields after variant. */ - for (i = 0; i < nr_choices; i++) { - ret = serialize_one_field(session, fields, - iter_output, &choices[i]); - if (ret) - return ret; - } - return 0; -} - -static -int serialize_one_type(struct lttng_session *session, - struct ustctl_field *fields, size_t *iter_output, - const char *field_name, const struct lttng_type *lt) -{ - int ret; - - /* - * Serializing a type (rather than a field) generates a ustctl_field - * entry with 0-length name. - */ - - switch (lt->atype) { - case atype_integer: - case atype_float: - case atype_string: - case atype_enum: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - enum ustctl_abstract_types atype; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_SYM_NAME_LEN); - uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - ret = serialize_basic_type(session, &atype, lt->atype, - &ut->u.legacy.basic, <->u.legacy.basic); - if (ret) - return ret; - ut->atype = atype; - (*iter_output)++; - break; - } - case atype_array: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - struct ustctl_basic_type *ubt; - const struct lttng_basic_type *lbt; - enum ustctl_abstract_types atype; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_SYM_NAME_LEN); - uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - ut->atype = ustctl_atype_array; - ubt = &ut->u.legacy.array.elem_type; - lbt = <->u.legacy.array.elem_type; - ut->u.legacy.array.length = lt->u.legacy.array.length; - ret = serialize_basic_type(session, &atype, lbt->atype, - &ubt->u.basic, &lbt->u.basic); - if (ret) - return -EINVAL; - ubt->atype = atype; - (*iter_output)++; - break; - } - case atype_array_nestable: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_SYM_NAME_LEN); - uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - ut->atype = ustctl_atype_array_nestable; - ut->u.array_nestable.length = lt->u.array_nestable.length; - ut->u.array_nestable.alignment = lt->u.array_nestable.alignment; - (*iter_output)++; - - ret = serialize_one_type(session, fields, iter_output, NULL, - lt->u.array_nestable.elem_type); - if (ret) - return -EINVAL; - break; - } - case atype_sequence: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - struct ustctl_basic_type *ubt; - const struct lttng_basic_type *lbt; - enum ustctl_abstract_types atype; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_SYM_NAME_LEN); - uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - uf->type.atype = ustctl_atype_sequence; - ubt = &ut->u.legacy.sequence.length_type; - lbt = <->u.legacy.sequence.length_type; - ret = serialize_basic_type(session, &atype, lbt->atype, - &ubt->u.basic, &lbt->u.basic); - if (ret) - return -EINVAL; - ubt->atype = atype; - ubt = &ut->u.legacy.sequence.elem_type; - lbt = <->u.legacy.sequence.elem_type; - ret = serialize_basic_type(session, &atype, lbt->atype, - &ubt->u.basic, &lbt->u.basic); - if (ret) - return -EINVAL; - ubt->atype = atype; - (*iter_output)++; - break; - } - case atype_sequence_nestable: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_SYM_NAME_LEN); - uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - ut->atype = ustctl_atype_sequence_nestable; - strncpy(ut->u.sequence_nestable.length_name, - lt->u.sequence_nestable.length_name, - LTTNG_UST_SYM_NAME_LEN); - ut->u.sequence_nestable.length_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - ut->u.sequence_nestable.alignment = lt->u.sequence_nestable.alignment; - (*iter_output)++; - - ret = serialize_one_type(session, fields, iter_output, NULL, - lt->u.sequence_nestable.elem_type); - if (ret) - return -EINVAL; - break; - } - case atype_dynamic: - { - ret = serialize_dynamic_type(session, fields, iter_output, - field_name); - if (ret) - return -EINVAL; - break; - } - case atype_struct: - { - struct ustctl_field *uf = &fields[*iter_output]; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_SYM_NAME_LEN); - uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - uf->type.atype = ustctl_atype_struct; - uf->type.u.legacy._struct.nr_fields = lt->u.legacy._struct.nr_fields; - (*iter_output)++; - - ret = serialize_fields(session, fields, iter_output, - lt->u.legacy._struct.nr_fields, - lt->u.legacy._struct.fields); - if (ret) - return -EINVAL; - break; - } - case atype_struct_nestable: - { - struct ustctl_field *uf = &fields[*iter_output]; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_SYM_NAME_LEN); - uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - uf->type.atype = ustctl_atype_struct_nestable; - uf->type.u.struct_nestable.nr_fields = lt->u.struct_nestable.nr_fields; - uf->type.u.struct_nestable.alignment = lt->u.struct_nestable.alignment; - (*iter_output)++; - - ret = serialize_fields(session, fields, iter_output, - lt->u.struct_nestable.nr_fields, - lt->u.struct_nestable.fields); - if (ret) - return -EINVAL; - break; - } - case atype_enum_nestable: - { - struct ustctl_field *uf = &fields[*iter_output]; - struct ustctl_type *ut = &uf->type; - - if (field_name) { - strncpy(uf->name, field_name, LTTNG_UST_SYM_NAME_LEN); - uf->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - } else { - uf->name[0] = '\0'; - } - strncpy(ut->u.enum_nestable.name, lt->u.enum_nestable.desc->name, - LTTNG_UST_SYM_NAME_LEN); - ut->u.enum_nestable.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - ut->atype = ustctl_atype_enum_nestable; - (*iter_output)++; - - ret = serialize_one_type(session, fields, iter_output, NULL, - lt->u.enum_nestable.container_type); - if (ret) - return -EINVAL; - if (session) { - const struct lttng_enum *_enum; - - _enum = lttng_ust_enum_get_from_desc(session, lt->u.enum_nestable.desc); - if (!_enum) - return -EINVAL; - ut->u.enum_nestable.id = _enum->id; - } else { - ut->u.enum_nestable.id = -1ULL; - } - break; - } - default: - return -EINVAL; - } - return 0; -} - -static -int serialize_one_field(struct lttng_session *session, - struct ustctl_field *fields, size_t *iter_output, - const struct lttng_event_field *lf) -{ - /* skip 'nowrite' fields */ - if (lf->nowrite) - return 0; - - return serialize_one_type(session, fields, iter_output, lf->name, &lf->type); -} - -static -int serialize_fields(struct lttng_session *session, - struct ustctl_field *ustctl_fields, - size_t *iter_output, size_t nr_lttng_fields, - const struct lttng_event_field *lttng_fields) -{ - int ret; - size_t i; - - for (i = 0; i < nr_lttng_fields; i++) { - ret = serialize_one_field(session, ustctl_fields, - iter_output, <tng_fields[i]); - if (ret) - return ret; - } - return 0; -} - -static -int alloc_serialize_fields(struct lttng_session *session, - size_t *_nr_write_fields, - struct ustctl_field **ustctl_fields, - size_t nr_fields, - const struct lttng_event_field *lttng_fields) -{ - struct ustctl_field *fields; - int ret; - size_t iter_output = 0; - ssize_t nr_write_fields; - - nr_write_fields = count_fields_recursive(nr_fields, lttng_fields); - if (nr_write_fields < 0) { - return (int) nr_write_fields; - } - - fields = zmalloc(nr_write_fields * sizeof(*fields)); - if (!fields) - return -ENOMEM; - - ret = serialize_fields(session, fields, &iter_output, nr_fields, - lttng_fields); - if (ret) - goto error_type; - - *_nr_write_fields = nr_write_fields; - *ustctl_fields = fields; - return 0; - -error_type: - free(fields); - return ret; -} - -static -int serialize_entries(struct ustctl_enum_entry **_entries, - size_t nr_entries, - const struct lttng_enum_entry *lttng_entries) -{ - struct ustctl_enum_entry *entries; - int i; - - /* Serialize the entries */ - entries = zmalloc(nr_entries * sizeof(*entries)); - if (!entries) - return -ENOMEM; - for (i = 0; i < nr_entries; i++) { - struct ustctl_enum_entry *uentry; - const struct lttng_enum_entry *lentry; - - uentry = &entries[i]; - lentry = <tng_entries[i]; - - uentry->start.value = lentry->start.value; - uentry->start.signedness = lentry->start.signedness; - uentry->end.value = lentry->end.value; - uentry->end.signedness = lentry->end.signedness; - strncpy(uentry->string, lentry->string, LTTNG_UST_SYM_NAME_LEN); - uentry->string[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - - if (lentry->u.extra.options & LTTNG_ENUM_ENTRY_OPTION_IS_AUTO) { - uentry->u.extra.options |= - USTCTL_UST_ENUM_ENTRY_OPTION_IS_AUTO; - } - } - *_entries = entries; - return 0; -} - -static -int serialize_ctx_fields(struct lttng_session *session, - size_t *_nr_write_fields, - struct ustctl_field **ustctl_fields, - size_t nr_fields, - const struct lttng_ctx_field *lttng_fields) -{ - struct ustctl_field *fields; - int ret; - size_t i, iter_output = 0; - ssize_t nr_write_fields; - - nr_write_fields = count_ctx_fields_recursive(nr_fields, - lttng_fields); - if (nr_write_fields < 0) { - return (int) nr_write_fields; - } - - fields = zmalloc(nr_write_fields * sizeof(*fields)); - if (!fields) - return -ENOMEM; - - for (i = 0; i < nr_fields; i++) { - ret = serialize_one_field(session, fields, &iter_output, - <tng_fields[i].event_field); - if (ret) - goto error_type; - } - - *_nr_write_fields = nr_write_fields; - *ustctl_fields = fields; - return 0; - -error_type: - free(fields); - return ret; -} - -/* - * Returns 0 on success, negative error value on error. - */ -int ustcomm_register_event(int sock, - struct lttng_session *session, - int session_objd, /* session descriptor */ - int channel_objd, /* channel descriptor */ - const char *event_name, /* event name (input) */ - int loglevel, - const char *signature, /* event signature (input) */ - size_t nr_fields, /* fields */ - const struct lttng_event_field *lttng_fields, - const char *model_emf_uri, - uint32_t *id) /* event id (output) */ -{ - ssize_t len; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_event_msg m; - } msg; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_event_reply r; - } reply; - size_t signature_len, fields_len, model_emf_uri_len; - struct ustctl_field *fields = NULL; - size_t nr_write_fields = 0; - int ret; - - memset(&msg, 0, sizeof(msg)); - msg.header.notify_cmd = USTCTL_NOTIFY_CMD_EVENT; - msg.m.session_objd = session_objd; - msg.m.channel_objd = channel_objd; - strncpy(msg.m.event_name, event_name, LTTNG_UST_SYM_NAME_LEN); - msg.m.event_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - msg.m.loglevel = loglevel; - signature_len = strlen(signature) + 1; - msg.m.signature_len = signature_len; - - /* Calculate fields len, serialize fields. */ - if (nr_fields > 0) { - ret = alloc_serialize_fields(session, &nr_write_fields, &fields, - nr_fields, lttng_fields); - if (ret) - return ret; - } - - fields_len = sizeof(*fields) * nr_write_fields; - msg.m.fields_len = fields_len; - if (model_emf_uri) { - model_emf_uri_len = strlen(model_emf_uri) + 1; - } else { - model_emf_uri_len = 0; - } - msg.m.model_emf_uri_len = model_emf_uri_len; - - len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg)); - if (len > 0 && len != sizeof(msg)) { - ret = -EIO; - goto error_fields; - } - if (len < 0) { - ret = len; - goto error_fields; - } - - /* send signature */ - len = ustcomm_send_unix_sock(sock, signature, signature_len); - if (len > 0 && len != signature_len) { - ret = -EIO; - goto error_fields; - } - if (len < 0) { - ret = len; - goto error_fields; - } - - /* send fields */ - if (fields_len > 0) { - len = ustcomm_send_unix_sock(sock, fields, fields_len); - if (len > 0 && len != fields_len) { - ret = -EIO; - goto error_fields; - } - if (len < 0) { - ret = len; - goto error_fields; - } - } - free(fields); - - if (model_emf_uri_len) { - /* send model_emf_uri */ - len = ustcomm_send_unix_sock(sock, model_emf_uri, - model_emf_uri_len); - if (len > 0 && len != model_emf_uri_len) { - return -EIO; - } - if (len < 0) { - return len; - } - } - - /* receive reply */ - len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply)); - switch (len) { - case 0: /* orderly shutdown */ - return -EPIPE; - case sizeof(reply): - if (reply.header.notify_cmd != msg.header.notify_cmd) { - ERR("Unexpected result message command " - "expected: %u vs received: %u\n", - msg.header.notify_cmd, reply.header.notify_cmd); - return -EINVAL; - } - if (reply.r.ret_code > 0) - return -EINVAL; - if (reply.r.ret_code < 0) - return reply.r.ret_code; - *id = reply.r.event_id; - DBG("Sent register event notification for name \"%s\": ret_code %d, event_id %u\n", - event_name, reply.r.ret_code, reply.r.event_id); - return 0; - default: - if (len < 0) { - /* Transport level error */ - if (errno == EPIPE || errno == ECONNRESET) - len = -errno; - return len; - } else { - ERR("incorrect message size: %zd\n", len); - return len; - } - } - /* Unreached. */ - - /* Error path only. */ -error_fields: - free(fields); - return ret; -} - -/* - * Returns 0 on success, negative error value on error. - * Returns -EPIPE or -ECONNRESET if other end has hung up. - */ -int ustcomm_register_enum(int sock, - int session_objd, /* session descriptor */ - const char *enum_name, /* enum name (input) */ - size_t nr_entries, /* entries */ - const struct lttng_enum_entry *lttng_entries, - uint64_t *id) -{ - ssize_t len; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_enum_msg m; - } msg; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_enum_reply r; - } reply; - size_t entries_len; - struct ustctl_enum_entry *entries = NULL; - int ret; - - memset(&msg, 0, sizeof(msg)); - msg.header.notify_cmd = USTCTL_NOTIFY_CMD_ENUM; - msg.m.session_objd = session_objd; - strncpy(msg.m.enum_name, enum_name, LTTNG_UST_SYM_NAME_LEN); - msg.m.enum_name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; - - /* Calculate entries len, serialize entries. */ - if (nr_entries > 0) { - ret = serialize_entries(&entries, - nr_entries, lttng_entries); - if (ret) - return ret; - } - - entries_len = sizeof(*entries) * nr_entries; - msg.m.entries_len = entries_len; - - len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg)); - if (len > 0 && len != sizeof(msg)) { - ret = -EIO; - goto error_entries; - } - if (len < 0) { - ret = len; - goto error_entries; - } - - /* send entries */ - if (entries_len > 0) { - len = ustcomm_send_unix_sock(sock, entries, entries_len); - if (len > 0 && len != entries_len) { - ret = -EIO; - goto error_entries; - } - if (len < 0) { - ret = len; - goto error_entries; - } - } - free(entries); - entries = NULL; - - /* receive reply */ - len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply)); - switch (len) { - case 0: /* orderly shutdown */ - return -EPIPE; - case sizeof(reply): - if (reply.header.notify_cmd != msg.header.notify_cmd) { - ERR("Unexpected result message command " - "expected: %u vs received: %u\n", - msg.header.notify_cmd, reply.header.notify_cmd); - return -EINVAL; - } - if (reply.r.ret_code > 0) - return -EINVAL; - if (reply.r.ret_code < 0) - return reply.r.ret_code; - *id = reply.r.enum_id; - DBG("Sent register enum notification for name \"%s\": ret_code %d\n", - enum_name, reply.r.ret_code); - return 0; - default: - if (len < 0) { - /* Transport level error */ - if (errno == EPIPE || errno == ECONNRESET) - len = -errno; - return len; - } else { - ERR("incorrect message size: %zd\n", len); - return len; - } - } - return ret; - -error_entries: - free(entries); - return ret; -} - -/* - * Returns 0 on success, negative error value on error. - * Returns -EPIPE or -ECONNRESET if other end has hung up. - */ -int ustcomm_register_channel(int sock, - struct lttng_session *session, - int session_objd, /* session descriptor */ - int channel_objd, /* channel descriptor */ - size_t nr_ctx_fields, - const struct lttng_ctx_field *ctx_fields, - uint32_t *chan_id, /* channel id (output) */ - int *header_type) /* header type (output) */ -{ - ssize_t len; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_channel_msg m; - } msg; - struct { - struct ustcomm_notify_hdr header; - struct ustcomm_notify_channel_reply r; - } reply; - size_t fields_len; - struct ustctl_field *fields = NULL; - int ret; - size_t nr_write_fields = 0; - - memset(&msg, 0, sizeof(msg)); - msg.header.notify_cmd = USTCTL_NOTIFY_CMD_CHANNEL; - msg.m.session_objd = session_objd; - msg.m.channel_objd = channel_objd; - - /* Calculate fields len, serialize fields. */ - if (nr_ctx_fields > 0) { - ret = serialize_ctx_fields(session, &nr_write_fields, &fields, - nr_ctx_fields, ctx_fields); - if (ret) - return ret; - } - - fields_len = sizeof(*fields) * nr_write_fields; - msg.m.ctx_fields_len = fields_len; - len = ustcomm_send_unix_sock(sock, &msg, sizeof(msg)); - if (len > 0 && len != sizeof(msg)) { - free(fields); - return -EIO; - } - if (len < 0) { - free(fields); - return len; - } - - /* send fields */ - if (fields_len > 0) { - len = ustcomm_send_unix_sock(sock, fields, fields_len); - free(fields); - if (len > 0 && len != fields_len) { - return -EIO; - } - if (len < 0) { - return len; - } - } else { - free(fields); - } - - len = ustcomm_recv_unix_sock(sock, &reply, sizeof(reply)); - switch (len) { - case 0: /* orderly shutdown */ - return -EPIPE; - case sizeof(reply): - if (reply.header.notify_cmd != msg.header.notify_cmd) { - ERR("Unexpected result message command " - "expected: %u vs received: %u\n", - msg.header.notify_cmd, reply.header.notify_cmd); - return -EINVAL; - } - if (reply.r.ret_code > 0) - return -EINVAL; - if (reply.r.ret_code < 0) - return reply.r.ret_code; - *chan_id = reply.r.chan_id; - switch (reply.r.header_type) { - case 1: - case 2: - *header_type = reply.r.header_type; - break; - default: - ERR("Unexpected channel header type %u\n", - reply.r.header_type); - return -EINVAL; - } - DBG("Sent register channel notification: chan_id %d, header_type %d\n", - reply.r.chan_id, reply.r.header_type); - return 0; - default: - if (len < 0) { - /* Transport level error */ - if (errno == EPIPE || errno == ECONNRESET) - len = -errno; - return len; - } else { - ERR("incorrect message size: %zd\n", len); - return len; - } - } -} - -/* - * Set socket reciving timeout. - */ -int ustcomm_setsockopt_rcv_timeout(int sock, unsigned int msec) -{ - int ret; - struct timeval tv; - - tv.tv_sec = msec / 1000; - tv.tv_usec = (msec * 1000 % 1000000); - - ret = setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)); - if (ret < 0) { - PERROR("setsockopt SO_RCVTIMEO"); - ret = -errno; - } - - return ret; -} - -/* - * Set socket sending timeout. - */ -int ustcomm_setsockopt_snd_timeout(int sock, unsigned int msec) -{ - int ret; - struct timeval tv; - - tv.tv_sec = msec / 1000; - tv.tv_usec = (msec * 1000) % 1000000; - - ret = setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)); - if (ret < 0) { - PERROR("setsockopt SO_SNDTIMEO"); - ret = -errno; - } - - return ret; -}