cregit-Linux how code gets into the kernel

Release 4.10 samples/bpf/spintest_user.c

Directory: samples/bpf
#include <stdio.h>
#include <unistd.h>
#include <linux/bpf.h>
#include <string.h>
#include <assert.h>
#include <sys/resource.h>
#include "libbpf.h"
#include "bpf_load.h"

int main(int ac, char **argv) { struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; long key, next_key, value; char filename[256]; struct ksym *sym; int i; snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); setrlimit(RLIMIT_MEMLOCK, &r); if (load_kallsyms()) { printf("failed to process /proc/kallsyms\n"); return 2; } if (load_bpf_file(filename)) { printf("%s", bpf_log_buf); return 1; } for (i = 0; i < 5; i++) { key = 0; printf("kprobing funcs:"); while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) { bpf_map_lookup_elem(map_fd[0], &next_key, &value); assert(next_key == value); sym = ksym_search(value); printf(" %s", sym->name); key = next_key; } if (key) printf("\n"); key = 0; while (bpf_map_get_next_key(map_fd[0], &key, &next_key) == 0) bpf_map_delete_elem(map_fd[0], &next_key); sleep(1); } return 0; }


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Directory: samples/bpf
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