man: fix formatting in file-hierarchy

[thirdparty/systemd.git] / src / shared / bpf-link.c

diff --git a/src/shared/bpf-link.c b/src/shared/bpf-link.c
index 720ed40395b416d9bb634b5f134bcec605af386d..c83ebd48040ce9ced8c1d669225f4c3f14d3e644 100644 (file)
--- a/src/shared/bpf-link.c
+++ b/src/shared/bpf-link.c
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: LGPL-2.1+ */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
 
 #include "bpf-dlopen.h"
 #include "bpf-link.h"
@@ -16,7 +16,7 @@ bool bpf_can_link_program(struct bpf_program *prog) {
         link = sym_bpf_program__attach_cgroup(prog, /*cgroup_fd=*/-1);
 
         /* EBADF indicates that bpf_link is supported by kernel. */
-        return sym_libbpf_get_error(link) == -EBADF;
+        return bpf_get_error_translated(link) == -EBADF;
 }
 
 int bpf_serialize_link(FILE *f, FDSet *fds, const char *key, struct bpf_link *link) {
@@ -25,19 +25,26 @@ int bpf_serialize_link(FILE *f, FDSet *fds, const char *key, struct bpf_link *li
         if (!link)
                 return -ENOENT;
 
-        if (sym_libbpf_get_error(link) != 0)
+        if (bpf_get_error_translated(link) != 0)
                 return -EINVAL;
 
         return serialize_fd(f, fds, key, sym_bpf_link__fd(link));
 }
 
-struct bpf_link *bpf_link_free(struct bpf_link *link) {
+struct bpf_link* bpf_link_free(struct bpf_link *link) {
+        /* If libbpf wasn't dlopen()ed, sym_bpf_link__destroy might be unresolved (NULL), so let's not try to
+         * call it if link is NULL. link might also be a non-null "error pointer", but such a value can only
+         * originate from a call to libbpf, but that means that libbpf is available, and we can let
+         * bpf_link__destroy() handle it. */
+        if (link)
+                (void) sym_bpf_link__destroy(link);
 
-        /* Avoid a useless dlopen() if link == NULL */
-        if (!link)
-                return NULL;
+        return NULL;
+}
 
-        (void) sym_bpf_link__destroy(link);
+struct ring_buffer* bpf_ring_buffer_free(struct ring_buffer *rb) {
+        if (rb) /* See the comment in bpf_link_free(). */
+                sym_ring_buffer__free(rb);
 
         return NULL;
 }