cregit-Linux how code gets into the kernel

Release 4.7 samples/bpf/tracex4_user.c

Directory: samples/bpf
/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <stdbool.h>
#include <string.h>
#include <time.h>
#include <linux/bpf.h>
#include "libbpf.h"
#include "bpf_load.h"


struct pair {
	
long long val;
	
__u64 ip;
};


static __u64 time_get_ns(void) { struct timespec ts; clock_gettime(CLOCK_MONOTONIC, &ts); return ts.tv_sec * 1000000000ull + ts.tv_nsec; }

Contributors

PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov31100.00%1100.00%
Total31100.00%1100.00%


static void print_old_objects(int fd) { long long val = time_get_ns(); __u64 key, next_key; struct pair v; key = write(1, "\e[1;1H\e[2J", 12); /* clear screen */ key = -1; while (bpf_get_next_key(map_fd[0], &key, &next_key) == 0) { bpf_lookup_elem(map_fd[0], &next_key, &v); key = next_key; if (val - v.val < 1000000000ll) /* object was allocated more then 1 sec ago */ continue; printf("obj 0x%llx is %2lldsec old was allocated at ip %llx\n", next_key, (val - v.val) / 1000000000ll, v.ip); } }

Contributors

PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov113100.00%1100.00%
Total113100.00%1100.00%


int main(int ac, char **argv) { char filename[256]; int i; snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); if (load_bpf_file(filename)) { printf("%s", bpf_log_buf); return 1; } for (i = 0; ; i++) { print_old_objects(map_fd[1]); sleep(1); } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov86100.00%1100.00%
Total86100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
alexei starovoitovalexei starovoitov273100.00%1100.00%
Total273100.00%1100.00%
Directory: samples/bpf
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