bpf/progs/test_subskeleton_lib.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /* Copyright (c) Meta Platforms, Inc. and affiliates. */
0003
0004 #include <stdbool.h>
0005 #include <linux/bpf.h>
0006 #include <bpf/bpf_helpers.h>
0007
0008 /* volatile to force a read */
0009 const volatile int var1;
0010 volatile int var2 = 1;
0011 struct {
0012     int var3_1;
0013     __s64 var3_2;
0014 } var3;
0015 int libout1;
0016
0017 extern volatile bool CONFIG_BPF_SYSCALL __kconfig;
0018
0019 int var4[4];
0020
0021 __weak int var5 SEC(".data");
0022
0023 /* Fully contained within library extern-and-definition */
0024 extern int var6;
0025
0026 int var7 SEC(".data.custom");
0027
0028 int (*fn_ptr)(void);
0029
0030 struct {
0031     __uint(type, BPF_MAP_TYPE_HASH);
0032     __type(key, __u32);
0033     __type(value, __u32);
0034     __uint(max_entries, 16);
0035 } map1 SEC(".maps");
0036
0037 extern struct {
0038     __uint(type, BPF_MAP_TYPE_HASH);
0039     __type(key, __u32);
0040     __type(value, __u32);
0041     __uint(max_entries, 16);
0042 } map2 SEC(".maps");
0043
0044 int lib_routine(void)
0045 {
0046     __u32 key = 1, value = 2;
0047
0048     (void) CONFIG_BPF_SYSCALL;
0049     bpf_map_update_elem(&map2, &key, &value, BPF_ANY);
0050
0051     libout1 = var1 + var2 + var3.var3_1 + var3.var3_2 + var5 + var6;
0052     return libout1;
0053 }
0054
0055 SEC("perf_event")
0056 int lib_perf_handler(struct pt_regs *ctx)
0057 {
0058     return 0;
0059 }
0060
0061 char LICENSE[] SEC("license") = "GPL";