72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
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/* Copyright (c) 2017 Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <linux/bpf.h>
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#include <string.h>
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#include <linux/perf_event.h>
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#include <errno.h>
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#include <assert.h>
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#include <stdbool.h>
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#include <sys/resource.h>
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#include "libbpf.h"
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#include "bpf_load.h"
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/* This program verifies bpf attachment to tracepoint sys_enter_* and sys_exit_*.
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* This requires kernel CONFIG_FTRACE_SYSCALLS to be set.
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*/
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static void verify_map(int map_id)
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{
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__u32 key = 0;
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__u32 val;
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if (bpf_map_lookup_elem(map_id, &key, &val) != 0) {
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fprintf(stderr, "map_lookup failed: %s\n", strerror(errno));
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return;
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}
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if (val == 0)
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fprintf(stderr, "failed: map #%d returns value 0\n", map_id);
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}
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int main(int argc, char **argv)
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{
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struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
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char filename[256];
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int fd;
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setrlimit(RLIMIT_MEMLOCK, &r);
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snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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if (load_bpf_file(filename)) {
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fprintf(stderr, "%s", bpf_log_buf);
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return 1;
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}
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/* current load_bpf_file has perf_event_open default pid = -1
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* and cpu = 0, which permits attached bpf execution on
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* all cpus for all pid's. bpf program execution ignores
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* cpu affinity.
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*/
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/* trigger some "open" operations */
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr, "open failed: %s\n", strerror(errno));
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return 1;
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}
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close(fd);
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/* verify the map */
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verify_map(map_fd[0]);
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verify_map(map_fd[1]);
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return 0;
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}
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