*
* Linux Trace Toolkit Netlink Control Library
*
- * Controls the ltt-control kernel module through a netlink socket.
- *
- * Heavily inspired from libipq.c (iptables) made by
- * James Morris <jmorris@intercode.com.au>
+ * Controls the ltt-control kernel module through debugfs.
*
* Copyright 2005 -
* Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
- *
+ *
*/
#ifdef HAVE_CONFIG_H
#include <liblttctl/lttctl.h>
#include <errno.h>
#include <stdio.h>
-#include <error.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <unistd.h>
#include <string.h>
+#include <dirent.h>
+#include <limits.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#define MAX_CHANNEL (256)
+static char debugfsmntdir[PATH_MAX];
-/* Private interface */
-
-enum {
- LTTCTL_ERR_NONE = 0,
- LTTCTL_ERR_IMPL,
- LTTCTL_ERR_HANDLE,
- LTTCTL_ERR_SOCKET,
- LTTCTL_ERR_BIND,
- LTTCTL_ERR_BUFFER,
- LTTCTL_ERR_RECV,
- LTTCTL_ERR_NLEOF,
- LTTCTL_ERR_ADDRLEN,
- LTTCTL_ERR_STRUNC,
- LTTCTL_ERR_RTRUNC,
- LTTCTL_ERR_NLRECV,
- LTTCTL_ERR_SEND,
- LTTCTL_ERR_SUPP,
- LTTCTL_ERR_RECVBUF,
- LTTCTL_ERR_TIMEOUT,
- LTTCTL_ERR_PROTOCOL,
-};
-#define LTTCTL_MAXERR LTTCTL_ERR_PROTOCOL
-
-
-struct lttctl_errmap_t {
- int errcode;
- char *message;
-} lttctl_errmap[] = {
- { LTTCTL_ERR_NONE, "Unknown error" },
- { LTTCTL_ERR_IMPL, "Implementation error" },
- { LTTCTL_ERR_HANDLE, "Unable to create netlink handle" },
- { LTTCTL_ERR_SOCKET, "Unable to create netlink socket" },
- { LTTCTL_ERR_BIND, "Unable to bind netlink socket" },
- { LTTCTL_ERR_BUFFER, "Unable to allocate buffer" },
- { LTTCTL_ERR_RECV, "Failed to receive netlink message" },
- { LTTCTL_ERR_NLEOF, "Received EOF on netlink socket" },
- { LTTCTL_ERR_ADDRLEN, "Invalid peer address length" },
- { LTTCTL_ERR_STRUNC, "Sent message truncated" },
- { LTTCTL_ERR_RTRUNC, "Received message truncated" },
- { LTTCTL_ERR_NLRECV, "Received error from netlink" },
- { LTTCTL_ERR_SEND, "Failed to send netlink message" },
- { LTTCTL_ERR_SUPP, "Operation not supported" },
- { LTTCTL_ERR_RECVBUF, "Receive buffer size invalid" },
- { LTTCTL_ERR_TIMEOUT, "Timeout"},
- { LTTCTL_ERR_PROTOCOL, "Invalid protocol specified" }
-};
-
-static int lttctl_errno = LTTCTL_ERR_NONE;
-
-
-static ssize_t lttctl_netlink_sendto(const struct lttctl_handle *h,
- const void *msg, size_t len);
-
-static ssize_t lttctl_netlink_recvfrom(const struct lttctl_handle *h,
- unsigned char *buf, size_t len,
- int timeout);
-
-static ssize_t lttctl_netlink_sendmsg(const struct lttctl_handle *h,
- const struct msghdr *msg,
- unsigned int flags);
-
-static char *lttctl_strerror(int errcode);
-
-void lttctl_perror(const char *s);
-
-static ssize_t lttctl_netlink_sendto(const struct lttctl_handle *h,
- const void *msg, size_t len)
-{
- int status = sendto(h->fd, msg, len, 0,
- (struct sockaddr *)&h->peer, sizeof(h->peer));
- if (status < 0)
- lttctl_errno = LTTCTL_ERR_SEND;
-
- return status;
-}
-
-static ssize_t lttctl_netlink_sendmsg(const struct lttctl_handle *h,
- const struct msghdr *msg,
- unsigned int flags)
+static int initdebugfsmntdir(void)
{
- int status = sendmsg(h->fd, msg, flags);
- if (status < 0)
- lttctl_errno = LTTCTL_ERR_SEND;
- return status;
-}
+ char mnt_dir[PATH_MAX];
+ char mnt_type[PATH_MAX];
-static ssize_t lttctl_netlink_recvfrom(const struct lttctl_handle *h,
- unsigned char *buf, size_t len,
- int timeout)
-{
- int addrlen, status;
- struct nlmsghdr *nlh;
-
- if (len < sizeof(struct nlmsghdr)) {
- lttctl_errno = LTTCTL_ERR_RECVBUF;
- lttctl_perror("Netlink recvfrom");
- return -1;
- }
- addrlen = sizeof(h->peer);
-
- if (timeout != 0) {
- int ret;
- struct timeval tv;
- fd_set read_fds;
-
- if (timeout < 0) {
- /* non-block non-timeout */
- tv.tv_sec = 0;
- tv.tv_usec = 0;
- } else {
- tv.tv_sec = timeout / 1000000;
- tv.tv_usec = timeout % 1000000;
- }
+ FILE *fp = fopen("/proc/mounts", "r");
+ if (!fp) {
+ fprintf(stderr, "%s: Can't open /proc/mounts\n", __func__);
+ return 1;
+ }
- FD_ZERO(&read_fds);
- FD_SET(h->fd, &read_fds);
- ret = select(h->fd+1, &read_fds, NULL, NULL, &tv);
- if (ret < 0) {
- if (errno == EINTR) {
- printf("eintr\n");
- return 0;
- } else {
- lttctl_errno = LTTCTL_ERR_RECV;
- lttctl_perror("Netlink recvfrom");
- return -1;
- }
+ while (1) {
+ if (fscanf(fp, "%*s %s %s %*s %*s %*s", mnt_dir, mnt_type)
+ <= 0) {
+ fprintf(stderr, "%s: debugfs mountpoint not found\n",
+ __func__);
+ return 1;
}
- if (!FD_ISSET(h->fd, &read_fds)) {
- lttctl_errno = LTTCTL_ERR_TIMEOUT;
- printf("timeout\n");
+ if (!strcmp(mnt_type, "debugfs")) {
+ strcpy(debugfsmntdir, mnt_dir);
return 0;
}
}
- status = recvfrom(h->fd, buf, len, 0,
- (struct sockaddr *)&h->peer, &addrlen);
-
- if (status < 0) {
- lttctl_errno = LTTCTL_ERR_RECV;
- lttctl_perror("Netlink recvfrom");
- return status;
- }
- if (addrlen != sizeof(h->peer)) {
- lttctl_errno = LTTCTL_ERR_RECV;
- lttctl_perror("Netlink recvfrom");
- return -1;
- }
- if (h->peer.nl_pid != 0) {
- lttctl_errno = LTTCTL_ERR_RECV;
- lttctl_perror("Netlink recvfrom");
- return -1;
- }
- if (status == 0) {
- lttctl_errno = LTTCTL_ERR_NLEOF;
- lttctl_perror("Netlink recvfrom");
- return -1;
- }
- nlh = (struct nlmsghdr *)buf;
- if (nlh->nlmsg_flags & MSG_TRUNC || nlh->nlmsg_len > status) {
- lttctl_errno = LTTCTL_ERR_RTRUNC;
- lttctl_perror("Netlink recvfrom");
- return -1;
+}
+
+int lttctl_init(void)
+{
+ int ret;
+ DIR *dir;
+ char controldirname[PATH_MAX];
+
+ ret = initdebugfsmntdir();
+ if (ret) {
+ fprintf(stderr, "Debugfs mount point not found\n");
+ return 1;
}
-
- return status;
-}
+ /* check ltt control's debugfs dir */
+ sprintf(controldirname, "%s/ltt/control/", debugfsmntdir);
+ dir = opendir(controldirname);
+ if (!dir) {
+ fprintf(stderr, "ltt-trace-control's debugfs dir not found\n");
+ closedir(dir);
+ return -errno;
+ }
-static char *lttctl_strerror(int errcode)
-{
- if (errcode < 0 || errcode > LTTCTL_MAXERR)
- errcode = LTTCTL_ERR_IMPL;
- return lttctl_errmap[errcode].message;
-}
+ closedir(dir);
+ return 0;
+}
-char *lttctl_errstr(void)
+int lttctl_destroy(void)
{
- return lttctl_strerror(lttctl_errno);
+ return 0;
}
-void lttctl_perror(const char *s)
+static int lttctl_sendop(const char *fname, const char *op)
{
- if (s)
- fputs(s, stderr);
- else
- fputs("ERROR", stderr);
- if (lttctl_errno)
- fprintf(stderr, ": %s", lttctl_errstr());
- if (errno)
- fprintf(stderr, ": %s", strerror(-errno));
- fputc('\n', stderr);
-}
+ int fd;
+
+ if (!fname) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ return 1;
+ }
+
+ fd = open(fname, O_WRONLY);
+ if (fd == -1) {
+ fprintf(stderr, "%s: open %s failed: %s\n", __func__, fname,
+ strerror(errno));
+ return errno;
+ }
+
+ if (write(fd, op, strlen(op)) == -1) {
+ fprintf(stderr, "%s: write %s to %s failed: %s\n", __func__, op,
+ fname, strerror(errno));
+ close(fd);
+ return 1;
+ }
-/* public interface */
+ close(fd);
+
+ return 0;
+}
/*
- * Create and initialise an lttctl handle.
+ * check is trace exist(check debugfsmntdir too)
+ * expect:
+ * 0: expect that trace not exist
+ * !0: expect that trace exist
+ *
+ * ret:
+ * 0: check pass
+ * 1: check failed
+ * -ERRNO: error happened (no check)
*/
-struct lttctl_handle *lttctl_create_handle(void)
+static int lttctl_check_trace(const char *name, int expect)
{
- int status;
- struct lttctl_handle *h;
+ char tracedirname[PATH_MAX];
+ DIR *dir;
+ int exist;
- h = (struct lttctl_handle *)malloc(sizeof(struct lttctl_handle));
- if (h == NULL) {
- lttctl_errno = LTTCTL_ERR_HANDLE;
- lttctl_perror("Create handle");
- goto alloc_error;
+ if (!name) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ return -EINVAL;
}
-
- memset(h, 0, sizeof(struct lttctl_handle));
-
- h->fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_LTT);
-
- if (h->fd == -1) {
- lttctl_errno = LTTCTL_ERR_SOCKET;
- lttctl_perror("Create handle");
- goto socket_error;
- }
- memset(&h->local, 0, sizeof(struct sockaddr_nl));
- h->local.nl_family = AF_NETLINK;
- h->local.nl_pid = getpid();
- h->local.nl_groups = 0;
- status = bind(h->fd, (struct sockaddr *)&h->local, sizeof(h->local));
- if (status == -1) {
- lttctl_errno = LTTCTL_ERR_BIND;
- lttctl_perror("Create handle");
- goto bind_error;
- }
- memset(&h->peer, 0, sizeof(struct sockaddr_nl));
- h->peer.nl_family = AF_NETLINK;
- h->peer.nl_pid = 0;
- h->peer.nl_groups = 0;
- return h;
-
- /* Error condition */
-bind_error:
-socket_error:
- close(h->fd);
-alloc_error:
- free(h);
- return NULL;
+
+ if (!debugfsmntdir[0]) {
+ fprintf(stderr, "%s: debugfsmntdir not valid\n", __func__);
+ return -EINVAL;
+ }
+
+ sprintf(tracedirname, "%s/ltt/control/%s", debugfsmntdir, name);
+
+ dir = opendir(tracedirname);
+ if (dir) {
+ exist = 1;
+ } else {
+ if (errno != ENOENT) {
+ fprintf(stderr, "%s: %s\n", __func__, strerror(errno));
+ return -EINVAL;
+ }
+ exist = 0;
+ }
+
+ closedir(dir);
+
+ if (!expect != !exist) {
+ if (exist)
+ fprintf(stderr, "Trace %s already exist\n", name);
+ else
+ fprintf(stderr, "Trace %s not exist\n", name);
+ return 1;
+ }
+
+ return 0;
}
/*
- * No error condition is checked here at this stage, but it may happen
- * if/when reliable messaging is implemented.
+ * get channel list of a trace
+ * don't include metadata channel when metadata is 0
+ *
+ * return number of channel on success
+ * return negative number on fail
+ * Caller must free channellist.
*/
-int lttctl_destroy_handle(struct lttctl_handle *h)
+static int lttctl_get_channellist(const char *tracename,
+ char ***channellist, int metadata)
{
- if (h) {
- close(h->fd);
- free(h);
+ char tracedirname[PATH_MAX];
+ struct dirent *dirent;
+ DIR *dir;
+ char **list = NULL, **old_list;
+ int nr_chan = 0;
+
+ sprintf(tracedirname, "%s/ltt/control/%s/channel", debugfsmntdir,
+ tracename);
+
+ dir = opendir(tracedirname);
+ if (!dir) {
+ nr_chan = -ENOENT;
+ goto error;
+ }
+
+ for (;;) {
+ dirent = readdir(dir);
+ if (!dirent)
+ break;
+ if (!strcmp(dirent->d_name, ".")
+ || !strcmp(dirent->d_name, ".."))
+ continue;
+ if (!metadata && !strcmp(dirent->d_name, "metadata"))
+ continue;
+ old_list = list;
+ list = malloc(sizeof(char *) * ++nr_chan);
+ memcpy(list, old_list, sizeof(*list) * (nr_chan - 1));
+ free(old_list);
+ list[nr_chan - 1] = strdup(dirent->d_name);
+ }
+
+ closedir(dir);
+
+ *channellist = list;
+ return nr_chan;
+error:
+ free(list);
+ *channellist = NULL;
+ return nr_chan;
+}
+
+int lttctl_setup_trace(const char *name)
+{
+ int ret;
+ char ctlfname[PATH_MAX];
+
+ if (!name) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ ret = -EINVAL;
+ goto arg_error;
+ }
+
+ ret = lttctl_check_trace(name, 0);
+ if (ret)
+ goto arg_error;
+
+ sprintf(ctlfname, "%s/ltt/setup_trace", debugfsmntdir);
+
+ ret = lttctl_sendop(ctlfname, name);
+ if (ret) {
+ fprintf(stderr, "Setup trace failed\n");
+ goto op_err;
}
+
return 0;
+
+op_err:
+arg_error:
+ return ret;
}
+int lttctl_destroy_trace(const char *name)
+{
+ int ret;
+ char ctlfname[PATH_MAX];
+
+ if (!name) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ ret = -EINVAL;
+ goto arg_error;
+ }
+
+ ret = lttctl_check_trace(name, 1);
+ if (ret)
+ goto arg_error;
+
+ sprintf(ctlfname, "%s/ltt/destroy_trace", debugfsmntdir);
+
+ ret = lttctl_sendop(ctlfname, name);
+ if (ret) {
+ fprintf(stderr, "Destroy trace failed\n");
+ goto op_err;
+ }
+
+ return 0;
+
+op_err:
+arg_error:
+ return ret;
+}
-int lttctl_create_trace(const struct lttctl_handle *h,
- char *name, enum trace_mode mode, char *trace_type,
- unsigned subbuf_size_low, unsigned n_subbufs_low,
- unsigned subbuf_size_med, unsigned n_subbufs_med,
- unsigned subbuf_size_high, unsigned n_subbufs_high)
+int lttctl_alloc_trace(const char *name)
{
- int err;
-
- struct {
- struct nlmsghdr nlh;
- lttctl_peer_msg_t msg;
- } req;
- struct {
- struct nlmsghdr nlh;
- struct nlmsgerr nlerr;
- lttctl_peer_msg_t msg;
- } ack;
-
- memset(&req, 0, sizeof(req));
- req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(lttctl_peer_msg_t));
- req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
- req.nlh.nlmsg_type = LTTCTLM_CONTROL;
- req.nlh.nlmsg_pid = h->local.nl_pid;
- req.nlh.nlmsg_seq = 0;
-
- strncpy(req.msg.trace_name, name, NAME_MAX);
- strncpy(req.msg.trace_type, trace_type, NAME_MAX);
- req.msg.op = OP_CREATE;
- req.msg.args.new_trace.mode = mode;
- req.msg.args.new_trace.subbuf_size_low = subbuf_size_low;
- req.msg.args.new_trace.n_subbufs_low = n_subbufs_low;
- req.msg.args.new_trace.subbuf_size_med = subbuf_size_med;
- req.msg.args.new_trace.n_subbufs_med = n_subbufs_med;
- req.msg.args.new_trace.subbuf_size_high = subbuf_size_high;
- req.msg.args.new_trace.n_subbufs_high = n_subbufs_high;
-
- err = lttctl_netlink_sendto(h, (void *)&req, req.nlh.nlmsg_len);
- if(err < 0) goto senderr;
-
- err = lttctl_netlink_recvfrom(h, (void*)&ack, sizeof(ack), 0);
- if(err < 0) goto senderr;
-
- err = ack.nlerr.error;
- if(err != 0) {
- errno = err;
- lttctl_perror("Create Trace Error");
- return err;
+ int ret;
+ char ctlfname[PATH_MAX];
+
+ if (!name) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ ret = -EINVAL;
+ goto arg_error;
+ }
+
+ ret = lttctl_check_trace(name, 1);
+ if (ret)
+ goto arg_error;
+
+ sprintf(ctlfname, "%s/ltt/control/%s/alloc", debugfsmntdir, name);
+
+ ret = lttctl_sendop(ctlfname, "1");
+ if (ret) {
+ fprintf(stderr, "Allocate trace failed\n");
+ goto op_err;
+ }
+
+ return 0;
+
+op_err:
+arg_error:
+ return ret;
+}
+
+int lttctl_start(const char *name)
+{
+ int ret;
+ char ctlfname[PATH_MAX];
+
+ if (!name) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ ret = -EINVAL;
+ goto arg_error;
+ }
+
+ ret = lttctl_check_trace(name, 1);
+ if (ret)
+ goto arg_error;
+
+ sprintf(ctlfname, "%s/ltt/control/%s/enabled", debugfsmntdir, name);
+
+ ret = lttctl_sendop(ctlfname, "1");
+ if (ret) {
+ fprintf(stderr, "Start trace failed\n");
+ goto op_err;
}
return 0;
-senderr:
- lttctl_perror("Create Trace Error");
- err = EPERM;
- return err;
+op_err:
+arg_error:
+ return ret;
}
-int lttctl_destroy_trace(const struct lttctl_handle *h,
- char *name)
+int lttctl_pause(const char *name)
{
- struct {
- struct nlmsghdr nlh;
- lttctl_peer_msg_t msg;
- } req;
- struct {
- struct nlmsghdr nlh;
- struct nlmsgerr nlerr;
- lttctl_peer_msg_t msg;
- } ack;
- int err;
-
- memset(&req, 0, sizeof(req));
- req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(lttctl_peer_msg_t));
- req.nlh.nlmsg_flags = NLM_F_REQUEST;
- req.nlh.nlmsg_type = LTTCTLM_CONTROL;
- req.nlh.nlmsg_pid = h->local.nl_pid;
-
- strncpy(req.msg.trace_name, name, NAME_MAX);
- req.msg.op = OP_DESTROY;
-
- err = lttctl_netlink_sendto(h, (void *)&req, req.nlh.nlmsg_len);
- if(err < 0) goto senderr;
-
- err = lttctl_netlink_recvfrom(h, (void*)&ack, sizeof(ack), 0);
- if(err < 0) goto senderr;
-
- err = ack.nlerr.error;
- if(err != 0) {
- errno = err;
- lttctl_perror("Destroy Trace Channels Error");
- return err;
+ int ret;
+ char ctlfname[PATH_MAX];
+
+ if (!name) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ ret = -EINVAL;
+ goto arg_error;
+ }
+
+ ret = lttctl_check_trace(name, 1);
+ if (ret)
+ goto arg_error;
+
+ sprintf(ctlfname, "%s/ltt/control/%s/enabled", debugfsmntdir, name);
+
+ ret = lttctl_sendop(ctlfname, "0");
+ if (ret) {
+ fprintf(stderr, "Pause trace failed\n");
+ goto op_err;
}
return 0;
-senderr:
- lttctl_perror("Destroy Trace Channels Error");
- err = EPERM;
- return err;
+op_err:
+arg_error:
+ return ret;
+}
+
+int lttctl_set_trans(const char *name, const char *trans)
+{
+ int ret;
+ char ctlfname[PATH_MAX];
+
+ if (!name) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ ret = -EINVAL;
+ goto arg_error;
+ }
+
+ ret = lttctl_check_trace(name, 1);
+ if (ret)
+ goto arg_error;
+
+ sprintf(ctlfname, "%s/ltt/control/%s/trans", debugfsmntdir, name);
+ ret = lttctl_sendop(ctlfname, trans);
+ if (ret) {
+ fprintf(stderr, "Set transport failed\n");
+ goto op_err;
+ }
+
+ return 0;
+
+op_err:
+arg_error:
+ return ret;
}
-int lttctl_start(const struct lttctl_handle *h,
- char *name)
+static int __lttctl_set_channel_enable(const char *name, const char *channel,
+ int enable)
{
- struct {
- struct nlmsghdr nlh;
- lttctl_peer_msg_t msg;
- } req;
- struct {
- struct nlmsghdr nlh;
- struct nlmsgerr nlerr;
- lttctl_peer_msg_t msg;
- } ack;
+ int ret;
+ char ctlfname[PATH_MAX];
- int err;
+ sprintf(ctlfname, "%s/ltt/control/%s/channel/%s/enable", debugfsmntdir,
+ name, channel);
- memset(&req, 0, sizeof(req));
- req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(lttctl_peer_msg_t));
- req.nlh.nlmsg_flags = NLM_F_REQUEST;
- req.nlh.nlmsg_type = LTTCTLM_CONTROL;
- req.nlh.nlmsg_pid = h->local.nl_pid;
+ ret = lttctl_sendop(ctlfname, enable ? "1" : "0");
+ if (ret)
+ fprintf(stderr, "Set channel's enable mode failed\n");
- strncpy(req.msg.trace_name, name, NAME_MAX);
- req.msg.op = OP_START;
+ return ret;
+}
+int lttctl_set_channel_enable(const char *name, const char *channel,
+ int enable)
+{
+ int ret;
- err = lttctl_netlink_sendto(h, (void *)&req, req.nlh.nlmsg_len);
- if(err < 0) goto senderr;
+ if (!name || !channel) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ ret = -EINVAL;
+ goto arg_error;
+ }
- err = lttctl_netlink_recvfrom(h, (void*)&ack, sizeof(ack), 0);
- if(err < 0) goto senderr;
+ ret = lttctl_check_trace(name, 1);
+ if (ret)
+ goto arg_error;
+
+ if (strcmp(channel, "all")) {
+ ret = __lttctl_set_channel_enable(name, channel, enable);
+ if (ret)
+ goto op_err;
+ } else {
+ char **channellist;
+ int n_channel;
+
+ /* Don't allow set enable state for metadata channel */
+ n_channel = lttctl_get_channellist(name, &channellist, 0);
+ if (n_channel < 0) {
+ fprintf(stderr, "%s: lttctl_get_channellist failed\n",
+ __func__);
+ ret = -ENOENT;
+ goto op_err;
+ }
- err = ack.nlerr.error;
- if(err != 0) {
- errno = err;
- lttctl_perror("Start Trace Error");
- return err;
+ for (; n_channel > 0; n_channel--) {
+ ret = __lttctl_set_channel_enable(name,
+ channellist[n_channel - 1], enable);
+ if (ret)
+ goto op_err;
+ }
+ free(channellist);
}
return 0;
-senderr:
- err = EPERM;
- lttctl_perror("Start Trace Error");
- return err;
+op_err:
+arg_error:
+ return ret;
+}
+
+static int __lttctl_set_channel_overwrite(const char *name, const char *channel,
+ int overwrite)
+{
+ int ret;
+ char ctlfname[PATH_MAX];
+
+ sprintf(ctlfname, "%s/ltt/control/%s/channel/%s/overwrite",
+ debugfsmntdir, name, channel);
+
+ ret = lttctl_sendop(ctlfname, overwrite ? "1" : "0");
+ if (ret)
+ fprintf(stderr, "Set channel's overwrite mode failed\n");
+
+ return ret;
+}
+int lttctl_set_channel_overwrite(const char *name, const char *channel,
+ int overwrite)
+{
+ int ret;
+
+ if (!name || !channel) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ ret = -EINVAL;
+ goto arg_error;
+ }
+
+ ret = lttctl_check_trace(name, 1);
+ if (ret)
+ goto arg_error;
+
+ if (strcmp(channel, "all")) {
+ ret = __lttctl_set_channel_overwrite(name, channel, overwrite);
+ if (ret)
+ goto op_err;
+ } else {
+ char **channellist;
+ int n_channel;
+
+ /* Don't allow set overwrite for metadata channel */
+ n_channel = lttctl_get_channellist(name, &channellist, 0);
+ if (n_channel < 0) {
+ fprintf(stderr, "%s: lttctl_get_channellist failed\n",
+ __func__);
+ ret = -ENOENT;
+ goto op_err;
+ }
+
+ for (; n_channel > 0; n_channel--) {
+ ret = __lttctl_set_channel_overwrite(name,
+ channellist[n_channel - 1], overwrite);
+ if (ret)
+ goto op_err;
+ }
+ free(channellist);
+ }
+
+ return 0;
+op_err:
+arg_error:
+ return ret;
}
-int lttctl_stop(const struct lttctl_handle *h,
- char *name)
+static int __lttctl_set_channel_subbuf_num(const char *name,
+ const char *channel, unsigned subbuf_num)
+{
+ int ret;
+ char ctlfname[PATH_MAX];
+ char opstr[32];
+
+ sprintf(ctlfname, "%s/ltt/control/%s/channel/%s/subbuf_num",
+ debugfsmntdir, name, channel);
+
+ sprintf(opstr, "%u", subbuf_num);
+
+ ret = lttctl_sendop(ctlfname, opstr);
+ if (ret)
+ fprintf(stderr, "Set channel's subbuf number failed\n");
+
+ return ret;
+}
+int lttctl_set_channel_subbuf_num(const char *name, const char *channel,
+ unsigned subbuf_num)
{
- struct {
- struct nlmsghdr nlh;
- lttctl_peer_msg_t msg;
- } req;
- struct {
- struct nlmsghdr nlh;
- struct nlmsgerr nlerr;
- lttctl_peer_msg_t msg;
- } ack;
- int err;
-
- memset(&req, 0, sizeof(req));
- req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(lttctl_peer_msg_t));
- req.nlh.nlmsg_flags = NLM_F_REQUEST;
- req.nlh.nlmsg_type = LTTCTLM_CONTROL;
- req.nlh.nlmsg_pid = h->local.nl_pid;
-
- strncpy(req.msg.trace_name, name, NAME_MAX);
- req.msg.op = OP_STOP;
-
- err = lttctl_netlink_sendto(h, (void *)&req, req.nlh.nlmsg_len);
- if(err < 0) goto senderr;
-
- err = lttctl_netlink_recvfrom(h, (void*)&ack, sizeof(ack), 0);
- if(err < 0) goto senderr;
-
- err = ack.nlerr.error;
- if(err != 0) {
- errno = err;
- lttctl_perror("Stop Trace Error");
- return err;
+ int ret;
+
+ if (!name || !channel) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ ret = -EINVAL;
+ goto arg_error;
+ }
+
+ ret = lttctl_check_trace(name, 1);
+ if (ret)
+ goto arg_error;
+
+ if (strcmp(channel, "all")) {
+ ret = __lttctl_set_channel_subbuf_num(name, channel,
+ subbuf_num);
+ if (ret)
+ goto op_err;
+ } else {
+ char **channellist;
+ int n_channel;
+
+ /* allow set subbuf_num for metadata channel */
+ n_channel = lttctl_get_channellist(name, &channellist, 1);
+ if (n_channel < 0) {
+ fprintf(stderr, "%s: lttctl_get_channellist failed\n",
+ __func__);
+ ret = -ENOENT;
+ goto op_err;
+ }
+
+ for (; n_channel > 0; n_channel--) {
+ ret = __lttctl_set_channel_subbuf_num(name,
+ channellist[n_channel - 1], subbuf_num);
+ if (ret)
+ goto op_err;
+ }
+ free(channellist);
}
return 0;
-senderr:
- err = EPERM;
- lttctl_perror("Stop Trace Error");
- return err;
+op_err:
+arg_error:
+ return ret;
+}
+
+static int __lttctl_set_channel_subbuf_size(const char *name,
+ const char *channel, unsigned subbuf_size)
+{
+ int ret;
+ char ctlfname[PATH_MAX];
+ char opstr[32];
+
+ sprintf(ctlfname, "%s/ltt/control/%s/channel/%s/subbuf_size",
+ debugfsmntdir, name, channel);
+
+ sprintf(opstr, "%u", subbuf_size);
+
+ ret = lttctl_sendop(ctlfname, opstr);
+ if (ret)
+ fprintf(stderr, "Set channel's subbuf size failed\n");
}
+int lttctl_set_channel_subbuf_size(const char *name, const char *channel,
+ unsigned subbuf_size)
+{
+ int ret;
+ if (!name || !channel) {
+ fprintf(stderr, "%s: args invalid\n", __func__);
+ ret = -EINVAL;
+ goto arg_error;
+ }
+
+ ret = lttctl_check_trace(name, 1);
+ if (ret)
+ goto arg_error;
+
+ if (strcmp(channel, "all")) {
+ ret = __lttctl_set_channel_subbuf_size(name, channel,
+ subbuf_size);
+ if (ret)
+ goto op_err;
+ } else {
+ char **channellist;
+ int n_channel;
+
+ /* allow set subbuf_size for metadata channel */
+ n_channel = lttctl_get_channellist(name, &channellist, 1);
+ if (n_channel < 0) {
+ fprintf(stderr, "%s: lttctl_get_channellist failed\n",
+ __func__);
+ ret = -ENOENT;
+ goto op_err;
+ }
+
+ for (; n_channel > 0; n_channel--) {
+ ret = __lttctl_set_channel_subbuf_size(name,
+ channellist[n_channel - 1], subbuf_size);
+ if (ret)
+ goto op_err;
+ }
+ free(channellist);
+ }
+
+ return 0;
+
+op_err:
+arg_error:
+ return ret;
+}
projects / ltt-control.git / blobdiff