bpf/prog_tests/linked_funcs.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /* Copyright (c) 2021 Facebook */
0003
0004 #include <test_progs.h>
0005 #include <sys/syscall.h>
0006 #include "linked_funcs.skel.h"
0007
0008 void test_linked_funcs(void)
0009 {
0010     int err;
0011     struct linked_funcs *skel;
0012
0013     skel = linked_funcs__open();
0014     if (!ASSERT_OK_PTR(skel, "skel_open"))
0015         return;
0016
0017     /* handler1 and handler2 are marked as SEC("?raw_tp/sys_enter") and
0018      * are set to not autoload by default
0019      */
0020     bpf_program__set_autoload(skel->progs.handler1, true);
0021     bpf_program__set_autoload(skel->progs.handler2, true);
0022
0023     skel->rodata->my_tid = syscall(SYS_gettid);
0024     skel->bss->syscall_id = SYS_getpgid;
0025
0026     err = linked_funcs__load(skel);
0027     if (!ASSERT_OK(err, "skel_load"))
0028         goto cleanup;
0029
0030     err = linked_funcs__attach(skel);
0031     if (!ASSERT_OK(err, "skel_attach"))
0032         goto cleanup;
0033
0034     /* trigger */
0035     syscall(SYS_getpgid);
0036
0037     ASSERT_EQ(skel->bss->output_val1, 2000 + 2000, "output_val1");
0038     ASSERT_EQ(skel->bss->output_ctx1, SYS_getpgid, "output_ctx1");
0039     ASSERT_EQ(skel->bss->output_weak1, 42, "output_weak1");
0040
0041     ASSERT_EQ(skel->bss->output_val2, 2 * 1000 + 2 * (2 * 1000), "output_val2");
0042     ASSERT_EQ(skel->bss->output_ctx2, SYS_getpgid, "output_ctx2");
0043     /* output_weak2 should never be updated */
0044     ASSERT_EQ(skel->bss->output_weak2, 0, "output_weak2");
0045
0046 cleanup:
0047     linked_funcs__destroy(skel);
0048 }