1local suite = require("test_helper") 2local ffi = require("ffi") 3local TestUprobes = {} 4 5ffi.cdef[[ 6 int getpid(void); 7 void malloc_stats(void); 8]] 9 10function TestUprobes:test_simple_library() 11 local text = [[ 12#include <uapi/linux/ptrace.h> 13BPF_ARRAY(stats, u64, 1); 14static void incr(int idx) { 15 u64 *ptr = stats.lookup(&idx); 16 if (ptr) 17 ++(*ptr); 18} 19int count(struct pt_regs *ctx) { 20 u32 pid = bpf_get_current_pid_tgid(); 21 if (pid == PID) 22 incr(0); 23 return 0; 24}]] 25 26 local pid = tonumber(ffi.C.getpid()) 27 local text = text:gsub("PID", tostring(pid)) 28 29 local b = BPF:new{text=text} 30 b:attach_uprobe{name="c", sym="malloc_stats", fn_name="count", pid=pid} 31 b:attach_uprobe{name="c", sym="malloc_stats", fn_name="count", pid=pid, retprobe=true} 32 33 assert_equals(BPF.num_open_uprobes(), 2) 34 35 ffi.C.malloc_stats() 36 37 local stats = b:get_table("stats") 38 assert_equals(tonumber(stats:get(0)), 2) 39end 40 41function TestUprobes:test_simple_binary() 42 local text = [[ 43#include <uapi/linux/ptrace.h> 44BPF_ARRAY(stats, u64, 1); 45static void incr(int idx) { 46 u64 *ptr = stats.lookup(&idx); 47 if (ptr) 48 ++(*ptr); 49} 50int count(struct pt_regs *ctx) { 51 u32 pid = bpf_get_current_pid_tgid(); 52 incr(0); 53 return 0; 54}]] 55 56 local b = BPF:new{text=text} 57 local pythonpath = "/usr/bin/python3" 58 local symname = "_start" 59 b:attach_uprobe{name=pythonpath, sym=symname, fn_name="count"} 60 b:attach_uprobe{name=pythonpath, sym=symname, fn_name="count", retprobe=true} 61 62 os.spawn(pythonpath .. " -V") 63 64 local stats = b:get_table("stats") 65 assert_true(tonumber(stats:get(0)) >= 2) 66end 67 68function TestUprobes:teardown() 69 BPF.cleanup() 70end 71 72suite("TestUprobes", TestUprobes) 73