Expose lttng-modules ABI version ioctl

[lttng-modules.git] / lttng-abi.h

diff --git a/lttng-abi.h b/lttng-abi.h
index 8f5c0935cb4037046ca1e1d65ef093396b976761..b63ead8d134c636838bf38baa9b3e2dcdf62879f 100644 (file)
--- a/lttng-abi.h
+++ b/lttng-abi.h
@@ -25,6 +25,13 @@
 
 #include <linux/fs.h>
 
+/*
+ * Major/minor version of ABI exposed to lttng tools. Major number
+ * should be increased when an incompatible ABI change is done.
+ */
+#define LTTNG_MODULES_ABI_MAJOR_VERSION                1
+#define LTTNG_MODULES_ABI_MINOR_VERSION                0
+
 #define LTTNG_KERNEL_SYM_NAME_LEN      256
 
 enum lttng_kernel_instrumentation {
@@ -109,6 +116,11 @@ struct lttng_kernel_tracer_version {
        uint32_t patchlevel;
 } __attribute__((packed));
 
+struct lttng_kernel_tracer_abi_version {
+       uint32_t major;
+       uint32_t minor;
+} __attribute__((packed));
+
 enum lttng_kernel_calibrate_type {
        LTTNG_KERNEL_CALIBRATE_KRETPROBE,
 };
@@ -163,6 +175,8 @@ struct lttng_kernel_context {
 #define LTTNG_KERNEL_CALIBRATE                 \
        _IOWR(0xF6, 0x49, struct lttng_kernel_calibrate)
 #define LTTNG_KERNEL_SYSCALL_LIST              _IO(0xF6, 0x4A)
+#define LTTNG_KERNEL_TRACER_ABI_VERSION                \
+       _IOR(0xF6, 0x4B, struct lttng_kernel_tracer_abi_version)
 
 /* Session FD ioctl */
 #define LTTNG_KERNEL_METADATA                  \