+ memcpy(channel.padding, chops->padding, sizeof(chops->padding));
+
+ return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_CHANNEL, &channel);
+}
+
+int kernctl_syscall_mask(int fd, char **syscall_mask, uint32_t *nr_bits)
+{
+ struct lttng_kernel_syscall_mask kmask_len, *kmask = NULL;
+ size_t array_alloc_len;
+ char *new_mask;
+ int ret = 0;
+
+ if (!syscall_mask) {
+ ret = -1;
+ goto end;
+ }
+
+ if (!nr_bits) {
+ ret = -1;
+ goto end;
+ }
+
+ kmask_len.len = 0;
+ ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, &kmask_len);
+ if (ret) {
+ goto end;
+ }
+
+ array_alloc_len = ALIGN(kmask_len.len, 8) >> 3;
+
+ kmask = zmalloc(sizeof(*kmask) + array_alloc_len);
+ if (!kmask) {
+ ret = -1;
+ goto end;
+ }
+
+ kmask->len = kmask_len.len;
+ ret = LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SYSCALL_MASK, kmask);
+ if (ret) {
+ goto end;
+ }
+
+ new_mask = realloc(*syscall_mask, array_alloc_len);
+ if (!new_mask) {
+ ret = -1;
+ goto end;
+ }
+ memcpy(new_mask, kmask->mask, array_alloc_len);
+ *syscall_mask = new_mask;
+ *nr_bits = kmask->len;
+
+end:
+ free(kmask);
+ return ret;
+}
+
+int kernctl_track_pid(int fd, int pid)
+{
+ return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_TRACK_PID, pid);
+}
+
+int kernctl_untrack_pid(int fd, int pid)
+{
+ return LTTNG_IOCTL_CHECK(fd, LTTNG_KERNEL_SESSION_UNTRACK_PID, pid);
+}
+
+int kernctl_list_tracker_pids(int fd)
+{
+ return LTTNG_IOCTL_NO_CHECK(fd, LTTNG_KERNEL_SESSION_LIST_TRACKER_PIDS);
+}
+
+static enum lttng_kernel_tracker_type get_kernel_tracker_type(
+ enum lttng_process_attr process_attr)
+{
+ switch (process_attr) {
+ case LTTNG_PROCESS_ATTR_PROCESS_ID:
+ return LTTNG_KERNEL_TRACKER_PID;
+ case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
+ return LTTNG_KERNEL_TRACKER_VPID;
+ case LTTNG_PROCESS_ATTR_USER_ID:
+ return LTTNG_KERNEL_TRACKER_UID;
+ case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
+ return LTTNG_KERNEL_TRACKER_VUID;
+ case LTTNG_PROCESS_ATTR_GROUP_ID:
+ return LTTNG_KERNEL_TRACKER_GID;
+ case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
+ return LTTNG_KERNEL_TRACKER_VGID;
+ default:
+ return LTTNG_KERNEL_TRACKER_UNKNOWN;
+ }
+}