+ struct lttng_kernel_channel channel;
+
+ if (lttng_kernel_use_old_abi) {
+ struct lttng_kernel_old_channel old_channel;
+
+ old_channel.overwrite = chops->overwrite;
+ old_channel.subbuf_size = chops->subbuf_size;
+ old_channel.num_subbuf = chops->num_subbuf;
+ old_channel.switch_timer_interval = chops->switch_timer_interval;
+ old_channel.read_timer_interval = chops->read_timer_interval;
+ old_channel.output = chops->output;
+
+ memset(old_channel.padding, 0, sizeof(old_channel.padding));
+ /*
+ * The new channel padding is smaller than the old ABI so we use the
+ * new ABI padding size for the memcpy.
+ */
+ memcpy(old_channel.padding, chops->padding, sizeof(chops->padding));
+
+ return ioctl(fd, LTTNG_KERNEL_OLD_CHANNEL, &old_channel);
+ }
+
+ channel.overwrite = chops->overwrite;
+ channel.subbuf_size = chops->subbuf_size;
+ channel.num_subbuf = chops->num_subbuf;
+ channel.switch_timer_interval = chops->switch_timer_interval;
+ channel.read_timer_interval = chops->read_timer_interval;
+ channel.output = chops->output;
+ memcpy(channel.padding, chops->padding, sizeof(chops->padding));
+
+ return ioctl(fd, LTTNG_KERNEL_CHANNEL, &channel);
+}
+
+int kernctl_enable_syscall(int fd, const char *syscall_name)
+{
+ struct lttng_kernel_event event;
+
+ memset(&event, 0, sizeof(event));
+ strncpy(event.name, syscall_name, sizeof(event.name));
+ event.name[sizeof(event.name) - 1] = '\0';
+ event.instrumentation = LTTNG_KERNEL_SYSCALL;
+ event.u.syscall.enable = 1;
+ return ioctl(fd, LTTNG_KERNEL_EVENT, &event);
+}
+
+int kernctl_disable_syscall(int fd, const char *syscall_name)
+{
+ struct lttng_kernel_event event;
+
+ memset(&event, 0, sizeof(event));
+ strncpy(event.name, syscall_name, sizeof(event.name));
+ event.name[sizeof(event.name) - 1] = '\0';
+ event.instrumentation = LTTNG_KERNEL_SYSCALL;
+ event.u.syscall.enable = 0;
+ return ioctl(fd, LTTNG_KERNEL_EVENT, &event);
+}
+
+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 = ioctl(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 = ioctl(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;