_IOW(0xF6, 0x55, struct lttng_kernel_channel)
#define LTTNG_KERNEL_SESSION_START _IO(0xF6, 0x56)
#define LTTNG_KERNEL_SESSION_STOP _IO(0xF6, 0x57)
+#define LTTNG_KERNEL_SESSION_TRACK_PID \
+ _IOR(0xF6, 0x58, int32_t)
+#define LTTNG_KERNEL_SESSION_UNTRACK_PID \
+ _IOR(0xF6, 0x59, int32_t)
/* Channel FD ioctl */
#define LTTNG_KERNEL_STREAM _IO(0xF6, 0x62)