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26 results

recvmsg.c

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  • test_cgrp2_array_pin.c 2.24 KiB
    /* Copyright (c) 2016 Facebook
     *
     * 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 <linux/unistd.h>
    #include <linux/bpf.h>
    
    #include <stdio.h>
    #include <stdint.h>
    #include <unistd.h>
    #include <string.h>
    #include <errno.h>
    #include <fcntl.h>
    
    #include "libbpf.h"
    
    static void usage(void)
    {
    	printf("Usage: test_cgrp2_array_pin [...]\n");
    	printf("       -F <file>   File to pin an BPF cgroup array\n");
    	printf("       -U <file>   Update an already pinned BPF cgroup array\n");
    	printf("       -v <value>  Full path of the cgroup2\n");
    	printf("       -h          Display this help\n");
    }
    
    int main(int argc, char **argv)
    {
    	const char *pinned_file = NULL, *cg2 = NULL;
    	int create_array = 1;
    	int array_key = 0;
    	int array_fd = -1;
    	int cg2_fd = -1;
    	int ret = -1;
    	int opt;
    
    	while ((opt = getopt(argc, argv, "F:U:v:")) != -1) {
    		switch (opt) {
    		/* General args */
    		case 'F':
    			pinned_file = optarg;
    			break;
    		case 'U':
    			pinned_file = optarg;
    			create_array = 0;
    			break;
    		case 'v':
    			cg2 = optarg;
    			break;
    		default:
    			usage();
    			goto out;
    		}
    	}
    
    	if (!cg2 || !pinned_file) {
    		usage();
    		goto out;
    	}
    
    	cg2_fd = open(cg2, O_RDONLY);
    	if (cg2_fd < 0) {
    		fprintf(stderr, "open(%s,...): %s(%d)\n",
    			cg2, strerror(errno), errno);
    		goto out;
    	}
    
    	if (create_array) {
    		array_fd = bpf_create_map(BPF_MAP_TYPE_CGROUP_ARRAY,
    					  sizeof(uint32_t), sizeof(uint32_t),
    					  1, 0);
    		if (array_fd < 0) {
    			fprintf(stderr,
    				"bpf_create_map(BPF_MAP_TYPE_CGROUP_ARRAY,...): %s(%d)\n",
    				strerror(errno), errno);
    			goto out;
    		}
    	} else {
    		array_fd = bpf_obj_get(pinned_file);
    		if (array_fd < 0) {
    			fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n",
    				pinned_file, strerror(errno), errno);
    			goto out;
    		}
    	}
    
    	ret = bpf_update_elem(array_fd, &array_key, &cg2_fd, 0);
    	if (ret) {
    		perror("bpf_update_elem");
    		goto out;
    	}
    
    	if (create_array) {
    		ret = bpf_obj_pin(array_fd, pinned_file);
    		if (ret) {
    			fprintf(stderr, "bpf_obj_pin(..., %s): %s(%d)\n",
    				pinned_file, strerror(errno), errno);
    			goto out;
    		}
    	}
    
    out:
    	if (array_fd != -1)
    		close(array_fd);
    	if (cg2_fd != -1)
    		close(cg2_fd);
    	return ret;
    }