missing_socket: drop unnecessary definitions and update comments

- SO_PEERGROUPS is since kernel v4.13
  (28b5ba2aa0f55d80adb2624564ed2b170c19519e),
- SO_BINDTOIFINDEX is since kernel v5.1
  (f5dd3d0c9638a9d9a02b5964c4ad636f06cf7e2c).

diff --git a/src/basic/missing_socket.h b/src/basic/missing_socket.h
index 3dbe735f64adf8c9f56847aa3512619004ab80fb..874e93f37edc62e4363f528867fd5f9d22b527a3 100644 (file)
--- a/src/basic/missing_socket.h
+++ b/src/basic/missing_socket.h
@@ -3,33 +3,29 @@
 
 #include <sys/socket.h>
 
-#ifndef SO_PEERGROUPS
-#define SO_PEERGROUPS 59
-#endif
-
+/* Supported since kernel v6.5 (5e2ff6704a275be009be8979af17c52361b79b89) */
 #ifndef SO_PASSPIDFD
 #define SO_PASSPIDFD 76
 #endif
 
+/* Supported since kernel v6.5 (7b26952a91cf65ff1cc867a2382a8964d8c0ee7d) */
 #ifndef SO_PEERPIDFD
 #define SO_PEERPIDFD 77
 #endif
 
-#ifndef SO_BINDTOIFINDEX
-#define SO_BINDTOIFINDEX 62
-#endif
-
 /* Not exposed yet. Defined in include/linux/socket.h. */
 #ifndef SOL_SCTP
 #define SOL_SCTP 132
 #endif
 
-/* since glibc-2.39 */
+/* Supported since kernel v2.6.17 (2c7946a7bf45ae86736ab3b43d0085e43947945c).
+ * Defined since glibc-2.39 */
 #ifndef SCM_SECURITY
 #define SCM_SECURITY 0x03
 #endif
 
-/* since glibc-2.39 */
+/* Supported since kernel v6.5 (5e2ff6704a275be009be8979af17c52361b79b89).
+ * Defined since glibc-2.39 */
 #ifndef SCM_PIDFD
 #define SCM_PIDFD 0x04
 #endif