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local suite = require("test_helper")
local ffi = require("ffi")
local TestUprobes = {}
ffi.cdef[[
int getpid(void);
void malloc_stats(void);
]]
function TestUprobes:test_simple_library()
local text = [[
#include <uapi/linux/ptrace.h>
BPF_ARRAY(stats, u64, 1);
static void incr(int idx) {
u64 *ptr = stats.lookup(&idx);
if (ptr)
++(*ptr);
}
int count(struct pt_regs *ctx) {
u32 pid = bpf_get_current_pid_tgid();
if (pid == PID)
incr(0);
return 0;
}]]
local pid = tonumber(ffi.C.getpid())
local text = text:gsub("PID", tostring(pid))
local b = BPF:new{text=text}
b:attach_uprobe{name="c", sym="malloc_stats", fn_name="count", pid=pid}
b:attach_uprobe{name="c", sym="malloc_stats", fn_name="count", pid=pid, retprobe=true}
assert_equals(BPF.num_open_uprobes(), 2)
ffi.C.malloc_stats()
local stats = b:get_table("stats")
assert_equals(tonumber(stats:get(0)), 2)
end
function TestUprobes:test_simple_binary()
local text = [[
#include <uapi/linux/ptrace.h>
BPF_ARRAY(stats, u64, 1);
static void incr(int idx) {
u64 *ptr = stats.lookup(&idx);
if (ptr)
++(*ptr);
}
int count(struct pt_regs *ctx) {
u32 pid = bpf_get_current_pid_tgid();
incr(0);
return 0;
}]]
local b = BPF:new{text=text}
b:attach_uprobe{name="/usr/bin/python", sym="main", fn_name="count"}
b:attach_uprobe{name="/usr/bin/python", sym="main", fn_name="count", retprobe=true}
os.spawn("/usr/bin/python -V")
local stats = b:get_table("stats")
assert_true(tonumber(stats:get(0)) >= 2)
end
function TestUprobes:teardown()
BPF.cleanup()
end
suite("TestUprobes", TestUprobes)
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