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cwnd-user.c
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cwnd-user.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/resource.h>
// #include <bpf/libbpf.h>
#include <uapi/linux/bpf.h>
// #include <bpf/bpf_helpers.h>
#define MAP_PATH "/sys/fs/bpf/wnd_map"
int main() {
// struct bpf_object *obj;
struct bpf_map *map;
int map_fd;
// Load the eBPF map from the filesystem
map_fd = bpf_obj_get(MAP_PATH);
if (map_fd < 0) {
fprintf(stderr, "Error loading eBPF map: %s\n", strerror(errno));
return 1;
}
// Access the eBPF map
map = bpf_map__next(NULL, map_fd);
if (!map) {
fprintf(stderr, "Error accessing eBPF map: %s\n", strerror(errno));
close(map_fd);
return 1;
}
// Read a value from the map
uint32_t key = 0; // Adjust the key based on your map's key type
uint32_t value;
int ret = bpf_map_lookup_elem(map_fd, &key, &value);
if (ret) {
fprintf(stderr, "Error reading value from eBPF map: %s\n", strerror(errno));
close(map_fd);
return 1;
}
printf("Value from the eBPF map: %llu\n", value);
// Clean up
close(map_fd);
return 0;
}