shaba/systemd
1
0
Fork 0
mirror of https://github.com/systemd/systemd.git synced 2024-10-27 18:55:40 +03:00
Code

bpf-program: document BPFProgram a bit

Browse Source
This commit is contained in:
Lennart Poettering 2021-06-08 18:49:50 +02:00
parent b57d752326
commit a947ebb515
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/shared/bpf-program.h
View File

@ -12,15 +12,23 @@
typedef struct BPFProgram BPFProgram;
/* This encapsulates three different concepts: the loaded BPF program, the BPF code, and the attachment to a
* cgroup. Typically our BPF programs go through all three stages: we build the code, we load it, and finally
* we attach it, but it might happen that we operate with programs that aren't loaded or aren't attached, or
* where we don't have the code. */
struct BPFProgram {
unsigned n_ref;
/* The loaded BPF program, if loaded */
int kernel_fd;
uint32_t prog_type;
/* The code of it BPF program, if known */
size_t n_instructions;
struct bpf_insn *instructions;
/* The cgroup path the program is attached to, if it is attached. If non-NULL bpf_program_unref()
* will detach on destruction. */
char *attached_path;
int attached_type;
uint32_t attached_flags;
@ -37,6 +45,7 @@ int bpf_program_load_from_bpf_fs(BPFProgram *p, const char *path);
int bpf_program_cgroup_attach(BPFProgram *p, int type, const char *path, uint32_t flags);
int bpf_program_cgroup_detach(BPFProgram *p);
int bpf_program_pin(int prog_fd, const char *bpffs_path);
int bpf_program_get_id_by_fd(int prog_fd, uint32_t *ret_id);