X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust-comm%2Flttng-ust-comm.c;h=f9398e0d9891311ef2cdb3837905a4a67944c9ca;hb=HEAD;hp=f469567690b3a9a88a2d7f4252417e130a1c6975;hpb=74d81a6cca2cd4a7718bba9368f382f9f2fbba84;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 f4695676..00000000
--- a/liblttng-ust-comm/lttng-ust-comm.c
+++ /dev/null
@@ -1,582 +0,0 @@
-/*
- * Copyright (C)  2011 - David Goulet <david.goulet@polymtl.ca>
- * Copyright (C)  2011-2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * 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
- */
-
-#define _GNU_SOURCE
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/un.h>
-#include <unistd.h>
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
-
-#include <ust-comm.h>
-#include <helper.h>
-#include <lttng/ust-error.h>
-
-#define USTCOMM_CODE_OFFSET(code)	\
-	(code == LTTNG_UST_OK ? 0 : (code - LTTNG_UST_ERR + 1))
-
-#define USTCOMM_MAX_SEND_FDS	4
-
-/*
- * 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",
-};
-
-/*
- * 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.
- */
-int ustcomm_connect_unix_sock(const char *pathname)
-{
-	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.
-	 */
-	fd = socket(PF_UNIX, SOCK_STREAM, 0);
-	if (fd < 0) {
-		perror("socket");
-		ret = -errno;
-		goto error;
-	}
-	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 error, because connect
-		 * is used in normal execution to detect if sessiond is
-		 * alive.
-		 */
-		ret = -errno;
-		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) {
-		perror("accept");
-		return -errno;
-	}
-	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.
- */
-int ustcomm_close_unix_sock(int sock)
-{
-	int ret;
-
-	ret = close(sock);
-	if (ret < 0) {
-		perror("close");
-		ret = -errno;
-	}
-
-	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;
-
-	memset(&msg, 0, sizeof(msg));
-
-	iov[0].iov_base = buf;
-	iov[0].iov_len = len;
-	msg.msg_iov = iov;
-	msg.msg_iovlen = 1;
-
-	do {
-		ret = recvmsg(sock, &msg, 0);
-	} while (ret < 0 && errno == EINTR);
-
-	if (ret < 0) {
-		int shutret;
-
-		if (errno != EPIPE && errno != ECONNRESET)
-			perror("recvmsg");
-		ret = -errno;
-
-		shutret = shutdown(sock, SHUT_RDWR);
-		if (shutret)
-			fprintf(stderr, "Socket shutdown error");
-	}
-
-	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, void *buf, size_t len)
-{
-	struct msghdr msg;
-	struct iovec iov[1];
-	ssize_t ret;
-
-	memset(&msg, 0, sizeof(msg));
-
-	iov[0].iov_base = 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;
-
-		shutret = shutdown(sock, SHUT_RDWR);
-		if (shutret)
-			fprintf(stderr, "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);
-	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, 0);
-	} while (ret < 0 && errno == EINTR);
-	if (ret < 0) {
-		/*
-		 * We consider EPIPE and ECONNRESET as expected.
-		 */
-		if (errno != EPIPE && errno != ECONNRESET) {
-			perror("sendmsg");
-		}
-	}
-	return ret;
-}
-
-/*
- * Recv a message accompanied by fd(s) from a unix socket.
- *
- * Returns the size of received data, or negative error value.
- *
- * 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;
-
-	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");
-		}
-		if (errno == EPIPE || errno == ECONNRESET)
-			ret = -errno;
-		goto end;
-	}
-	if (ret == 0) {
-		/* orderly shutdown */
-		ret = -EPIPE;
-		goto end;
-	}
-	if (ret != 1) {
-		fprintf(stderr, "Error: Received %zd bytes, expected %d\n",
-				ret, 1);
-		goto end;
-	}
-	if (msg.msg_flags & MSG_CTRUNC) {
-		fprintf(stderr, "Error: Control message truncated.\n");
-		ret = -1;
-		goto end;
-	}
-	cmsg = CMSG_FIRSTHDR(&msg);
-	if (!cmsg) {
-		fprintf(stderr, "Error: Invalid control message header\n");
-		ret = -1;
-		goto end;
-	}
-	if (cmsg->cmsg_level != SOL_SOCKET || cmsg->cmsg_type != SCM_RIGHTS) {
-		fprintf(stderr, "Didn't received any fd\n");
-		ret = -1;
-		goto end;
-	}
-	if (cmsg->cmsg_len != CMSG_LEN(sizeof_fds)) {
-		fprintf(stderr, "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);
-	ret = sizeof_fds;
-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 {
-			fprintf(stderr, "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):
-		if (lur->handle != expected_handle) {
-			fprintf(stderr, "Unexpected result message handle: "
-				"expected: %u vs received: %u\n",
-				expected_handle, lur->handle);
-			return -EINVAL;
-		}
-		if (lur->cmd != expected_cmd) {
-			fprintf(stderr, "Unexpected result message command "
-				"expected: %u vs received: %u\n",
-				expected_cmd, lur->cmd);
-			return -EINVAL;
-		}
-		return lur->ret_code;
-	default:
-		if (len < 0) {
-			/* Transport level error */
-			if (errno == EPIPE || errno == ECONNRESET)
-				len = -errno;
-			return len;
-		} else {
-			fprintf(stderr, "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)
-{
-	void *chan_data;
-	ssize_t len;
-
-	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;
-	}
-	*_chan_data = chan_data;
-	return len;
-
-error_recv:
-	free(chan_data);
-error_alloc:
-error_check:
-	return len;
-}
-
-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 */
-	len = ustcomm_recv_fds_unix_sock(sock, fds, 2);
-	if (len <= 0) {
-		if (len < 0) {
-			ret = len;
-			goto error;
-		} else {
-			ret = -EIO;
-			goto error;
-		}
-	}
-	*shm_fd = fds[0];
-	*wakeup_fd = fds[1];
-	return 0;
-
-error:
-	return ret;
-}