Remove "lib" prefix from .c/.h file names

[lttng-tools.git] / ltt-sessiond / kernel-ctl.c

diff --git a/ltt-sessiond/kernel-ctl.c b/ltt-sessiond/kernel-ctl.c
index 95463aa50fc96c6d6dfc67b8837fc08daa507dbf..cfea8942da7f421d4eeaf272f59b51261fe08e3e 100644 (file)
--- a/ltt-sessiond/kernel-ctl.c
+++ b/ltt-sessiond/kernel-ctl.c
@@ -3,8 +3,8 @@
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
+ * as published by the Free Software Foundation; only version 2
+ * of the License.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -25,8 +25,7 @@
 #include <unistd.h>
 
 #include "lttngerr.h"
-#include "ltt-sessiond.h"
-#include "libkernelctl.h"
+#include "kernelctl.h"
 #include "kernel-ctl.h"
 
 /*
@@ -42,7 +41,12 @@ int kernel_add_channel_context(struct ltt_kernel_channel *chan,
        DBG("Adding context to channel %s", chan->channel->name);
        ret = kernctl_add_context(chan->fd, ctx);
        if (ret < 0) {
-               perror("add context ioctl");
+               if (errno != EEXIST) {
+                       perror("add context ioctl");
+               } else {
+                       /* If EEXIST, we just ignore the error */
+                       ret = 0;
+               }
                goto error;
        }
 
@@ -125,7 +129,6 @@ int kernel_create_session(struct ltt_session *session, int tracer_fd)
 
        lks->kconsumer_fds_sent = 0;
        session->kernel_session = lks;
-       session->kern_session_count++;
 
        DBG("Kernel session created (fd: %d)", lks->fd);
 
@@ -141,13 +144,13 @@ error:
  *  Create a kernel channel, register it to the kernel tracer and add it to the
  *  kernel session.
  */
-int kernel_create_channel(struct ltt_kernel_session *session, struct lttng_channel *chan)
+int kernel_create_channel(struct ltt_kernel_session *session, struct lttng_channel *chan, char *path)
 {
        int ret;
        struct ltt_kernel_channel *lkc;
 
        /* Allocate kernel channel */
-       lkc = trace_create_kernel_channel(chan);
+       lkc = trace_create_kernel_channel(chan, path);
        if (lkc == NULL) {
                goto error;
        }
@@ -211,6 +214,8 @@ int kernel_create_event(struct lttng_event *ev, struct ltt_kernel_channel *chann
 
        /* Add event to event list */
        cds_list_add(&event->list, &channel->events_list.head);
+       channel->event_count++;
+
        DBG("Event %s created (fd: %d)", ev->name, event->fd);
 
        return 0;
@@ -283,6 +288,9 @@ int kernel_enable_event(struct ltt_kernel_event *event)
        ret = kernctl_enable(event->fd);
        if (ret < 0) {
                perror("enable event ioctl");
+               if (errno == EEXIST) {
+                       ret = -EEXIST;
+               }
                goto error;
        }
 
@@ -325,13 +333,13 @@ error:
  *  Create kernel metadata, open from the kernel tracer and add it to the
  *  kernel session.
  */
-int kernel_open_metadata(struct ltt_kernel_session *session)
+int kernel_open_metadata(struct ltt_kernel_session *session, char *path)
 {
        int ret;
        struct ltt_kernel_metadata *lkm;
 
        /* Allocate kernel metadata */
-       lkm = trace_create_kernel_metadata();
+       lkm = trace_create_kernel_metadata(path);
        if (lkm == NULL) {
                goto error;
        }
@@ -400,6 +408,23 @@ void kernel_wait_quiescent(int fd)
        }
 }
 
+/*
+ *  kernel_calibrate
+ */
+int kernel_calibrate(int fd, struct lttng_kernel_calibrate *calibrate)
+{
+       int ret;
+
+       ret = kernctl_calibrate(fd, calibrate);
+       if (ret < 0) {
+               perror("calibrate ioctl");
+               return -1;
+       }
+
+       return 0;
+}
+
+
 /*
  *  kernel_metadata_flush_buffer
  *
@@ -491,8 +516,8 @@ int kernel_open_channel_stream(struct ltt_kernel_channel *channel)
                        perror("fcntl session fd");
                }
 
-               ret = asprintf(&lks->pathname, "%s/trace_%d",
-                               channel->pathname, channel->stream_count);
+               ret = asprintf(&lks->pathname, "%s/%s_%d",
+                               channel->pathname, channel->channel->name, channel->stream_count);
                if (ret < 0) {
                        perror("asprintf kernel create stream");
                        goto error;
@@ -542,18 +567,16 @@ error:
 }
 
 /*
- *  kernel_list_events
- *
- *  Get the event list from the kernel tracer and return that list in the CTF
- *  format.
+ * Get the event list from the kernel tracer and return the number of elements.
  */
-ssize_t kernel_list_events(int tracer_fd, char **list)
+ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events)
 {
-       int fd;
-       char *buf, *line = NULL;
-       size_t nb, nbmem, total = 0;
+       int fd, pos;
+       char *event;
+       size_t nbmem, count = 0;
        ssize_t size;
        FILE *fp;
+       struct lttng_event *elist;
 
        fd = kernctl_tracepoint_list(tracer_fd);
        if (fd < 0) {
@@ -572,29 +595,30 @@ ssize_t kernel_list_events(int tracer_fd, char **list)
         * See kernel-ctl.h for explanation of this value
         */
        nbmem = KERNEL_EVENT_LIST_SIZE;
-       buf = malloc(nbmem);
+       elist = malloc(sizeof(struct lttng_event) * nbmem);
 
-       while ((size = getline(&line, &nb, fp)) != -1) {
-               if (total + size > nbmem) {
-                       DBG("Reallocating event list from %zd to %zd bytes", nbmem,
-                                       total + size + KERNEL_EVENT_LIST_SIZE);
+       while ((size = fscanf(fp, "event { name = %m[^;]; };%n\n", &event, &pos)) == 1) {
+               if (count > nbmem) {
+                       DBG("Reallocating event list from %zu to %zu bytes", nbmem,
+                                       nbmem + KERNEL_EVENT_LIST_SIZE);
                        /* Adding the default size again */
-                       nbmem = total + size + KERNEL_EVENT_LIST_SIZE;
-                       buf = realloc(buf, nbmem);
-                       if (buf == NULL) {
+                       nbmem += KERNEL_EVENT_LIST_SIZE;
+                       elist = realloc(elist, nbmem);
+                       if (elist == NULL) {
                                perror("realloc list events");
                                goto error;
                        }
                }
-               memcpy(buf + total, line, size);
-               total += size;
+               strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN);
+               elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
+               count++;
        }
 
-       *list = buf;
+       *events = elist;
 
-       DBG("Kernel list events done");
+       DBG("Kernel list events done (%zu events)", count);
 
-       return total;
+       return count;
 
 error:
        return -1;