freebsd/netlink: hide feature between "future-freebsd-netlink" flag

To allow the "Netlink on FreeBSD" feature to be usable before 0.3 gets
released, this builds on top of both the netlink feature patch from rust-lang#3201
if explicitely requested through a feature flag, but by default
provides the ifmib constants where they are located in previous 0.2
releases.

Since this relies on creating the netlink constants in a separate
module, and it seems we cannot check those automatically, avoids
testing them.

Signed-off-by: Yann Dirson <yann.dirson@vates.fr>

Author: ydirson

Cargo.toml

@@ -177,6 +177,9 @@ align = []
 
 # use_std is deprecated, use `std` instead
 use_std = ['std']
+# get Netlink support on FreeBSD, but with breaking API change,
+# see https://github.com/rust-lang/libc/pull/3367
+future-freebsd-netlink = []
 
 [workspace]
 members = [

libc-test/build.rs

@@ -2795,7 +2795,9 @@ fn test_freebsd(target: &str) {
             | "CTRL_ATTR_MCAST_GRP_UNSPEC"
             | "CTRL_ATTR_MCAST_GRP_NAME"
             | "CTRL_ATTR_MCAST_GRP_ID"
-                if Some(13) > freebsd_ver =>
+                if env!("CARGO_PKG_VERSION_MAJOR") == "0"
+                    && env!("CARGO_PKG_VERSION_MINOR") == "2"
+                    || Some(13) > freebsd_ver =>
             {
                 true
             }

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -2560,104 +2560,6 @@ pub const SO_TS_MONOTONIC: c_int = 3;
 pub const SO_TS_DEFAULT: c_int = SO_TS_REALTIME_MICRO;
 pub const SO_TS_CLOCK_MAX: c_int = SO_TS_MONOTONIC;
 
-/// netlink constants
-
-// sys/socket.h
-pub const AF_NETLINK: c_int = 38;
-pub const PF_NETLINK: c_int = AF_NETLINK;
-
-// netlink/netlink.h
-pub const SOL_NETLINK: c_int = 270;
-pub const NETLINK_ADD_MEMBERSHIP: c_int = 1;
-pub const NETLINK_DROP_MEMBERSHIP: c_int = 2;
-pub const NETLINK_PKTINFO: c_int = 3;
-pub const NETLINK_BROADCAST_ERROR: c_int = 4;
-pub const NETLINK_NO_ENOBUFS: c_int = 5;
-pub const NETLINK_RX_RING: c_int = 6;
-pub const NETLINK_TX_RING: c_int = 7;
-pub const NETLINK_LISTEN_ALL_NSID: c_int = 8;
-pub const NETLINK_LIST_MEMBERSHIPS: c_int = 9;
-pub const NETLINK_CAP_ACK: c_int = 10;
-pub const NETLINK_EXT_ACK: c_int = 11;
-pub const NETLINK_GET_STRICT_CHK: c_int = 12;
-//
-pub const NLM_F_REQUEST: c_int = 0x01;
-pub const NLM_F_MULTI: c_int = 0x02;
-pub const NLM_F_ACK: c_int = 0x04;
-pub const NLM_F_ECHO: c_int = 0x08;
-pub const NLM_F_DUMP_INTR: c_int = 0x10;
-pub const NLM_F_DUMP_FILTERED: c_int = 0x20;
-//
-pub const NLM_F_ROOT: c_int = 0x100;
-pub const NLM_F_MATCH: c_int = 0x200;
-pub const NLM_F_ATOMIC: c_int = 0x400;
-pub const NLM_F_DUMP: c_int = NLM_F_ROOT | NLM_F_MATCH;
-//
-pub const NLM_F_REPLACE: c_int = 0x100;
-pub const NLM_F_EXCL: c_int = 0x200;
-pub const NLM_F_CREATE: c_int = 0x400;
-pub const NLM_F_APPEND: c_int = 0x800;
-//
-pub const NLM_F_NONREC: c_int = 0x100;
-//
-pub const NLM_F_CAPPED: c_int = 0x100;
-pub const NLM_F_ACK_TLVS: c_int = 0x200;
-//
-pub const NLMSG_NOOP: c_int = 0x1;
-pub const NLMSG_ERROR: c_int = 0x2;
-pub const NLMSG_DONE: c_int = 0x3;
-pub const NLMSG_OVERRUN: c_int = 0x4;
-//
-pub const NETLINK_ROUTE: c_int = 0;
-pub const NETLINK_UNUSED: c_int = 1;
-pub const NETLINK_USERSOCK: c_int = 2;
-pub const NETLINK_FIREWALL: c_int = 3;
-pub const NETLINK_SOCK_DIAG: c_int = 4;
-pub const NETLINK_NFLOG: c_int = 5;
-pub const NETLINK_XFRM: c_int = 6;
-pub const NETLINK_SELINUX: c_int = 7;
-pub const NETLINK_ISCSI: c_int = 8;
-pub const NETLINK_AUDIT: c_int = 9;
-pub const NETLINK_FIB_LOOKUP: c_int = 10;
-pub const NETLINK_CONNECTOR: c_int = 11;
-pub const NETLINK_NETFILTER: c_int = 12;
-pub const NETLINK_IP6_FW: c_int = 13;
-pub const NETLINK_DNRTMSG: c_int = 14;
-pub const NETLINK_KOBJECT_UEVENT: c_int = 15;
-pub const NETLINK_GENERIC: c_int = 16;
-//
-const NL_ITEM_ALIGN_SIZE: c_int = 4; // mem::size_of::<u32>(); FIXME accept new dep?
-pub const NLMSG_ALIGNTO: c_int = NL_ITEM_ALIGN_SIZE;
-
-// netlink/netlink_generic.h
-pub const CTRL_CMD_UNSPEC: c_int = 0;
-pub const CTRL_CMD_NEWFAMILY: c_int = 1;
-pub const CTRL_CMD_DELFAMILY: c_int = 2;
-pub const CTRL_CMD_GETFAMILY: c_int = 3;
-pub const CTRL_CMD_NEWOPS: c_int = 4;
-pub const CTRL_CMD_DELOPS: c_int = 5;
-pub const CTRL_CMD_GETOPS: c_int = 6;
-pub const CTRL_CMD_NEWMCAST_GRP: c_int = 7;
-pub const CTRL_CMD_DELMCAST_GRP: c_int = 8;
-pub const CTRL_CMD_GETMCAST_GRP: c_int = 9;
-pub const CTRL_CMD_GETPOLICY: c_int = 10;
-//
-pub const CTRL_ATTR_UNSPEC: c_int = 0;
-pub const CTRL_ATTR_FAMILY_ID: c_int = 1;
-pub const CTRL_ATTR_FAMILY_NAME: c_int = 2;
-pub const CTRL_ATTR_VERSION: c_int = 3;
-pub const CTRL_ATTR_HDRSIZE: c_int = 4;
-pub const CTRL_ATTR_MAXATTR: c_int = 5;
-pub const CTRL_ATTR_OPS: c_int = 6;
-pub const CTRL_ATTR_MCAST_GROUPS: c_int = 7;
-pub const CTRL_ATTR_POLICY: c_int = 8;
-pub const CTRL_ATTR_OP_POLICY: c_int = 9;
-pub const CTRL_ATTR_OP: c_int = 10;
-//
-pub const CTRL_ATTR_MCAST_GRP_UNSPEC: c_int = 0;
-pub const CTRL_ATTR_MCAST_GRP_NAME: c_int = 1;
-pub const CTRL_ATTR_MCAST_GRP_ID: c_int = 2;
-
 pub const LOCAL_CREDS: c_int = 2;
 pub const LOCAL_CREDS_PERSISTENT: c_int = 3;
 pub const LOCAL_CONNWAIT: c_int = 4;
@@ -5279,3 +5181,12 @@ cfg_if! {
 
 // sys/net/if_mib.h
 pub mod ifmib;
+
+cfg_if! {
+    if #[cfg(feature = "future-freebsd-netlink")] {
+        mod netlink;
+        pub use self::netlink::*;
+    } else {
+        pub use ifmib::*;
+    }
+}

src/unix/bsd/freebsdlike/freebsd/netlink.rs

@@ -0,0 +1,95 @@
+// sys/socket.h
+pub const AF_NETLINK: c_int = 38;
+pub const PF_NETLINK: c_int = AF_NETLINK;
+
+// netlink/netlink.h
+pub const SOL_NETLINK: c_int = 270;
+pub const NETLINK_ADD_MEMBERSHIP: c_int = 1;
+pub const NETLINK_DROP_MEMBERSHIP: c_int = 2;
+pub const NETLINK_PKTINFO: c_int = 3;
+pub const NETLINK_BROADCAST_ERROR: c_int = 4;
+pub const NETLINK_NO_ENOBUFS: c_int = 5;
+pub const NETLINK_RX_RING: c_int = 6;
+pub const NETLINK_TX_RING: c_int = 7;
+pub const NETLINK_LISTEN_ALL_NSID: c_int = 8;
+pub const NETLINK_LIST_MEMBERSHIPS: c_int = 9;
+pub const NETLINK_CAP_ACK: c_int = 10;
+pub const NETLINK_EXT_ACK: c_int = 11;
+pub const NETLINK_GET_STRICT_CHK: c_int = 12;
+//
+pub const NLM_F_REQUEST: c_int = 0x01;
+pub const NLM_F_MULTI: c_int = 0x02;
+pub const NLM_F_ACK: c_int = 0x04;
+pub const NLM_F_ECHO: c_int = 0x08;
+pub const NLM_F_DUMP_INTR: c_int = 0x10;
+pub const NLM_F_DUMP_FILTERED: c_int = 0x20;
+//
+pub const NLM_F_ROOT: c_int = 0x100;
+pub const NLM_F_MATCH: c_int = 0x200;
+pub const NLM_F_ATOMIC: c_int = 0x400;
+pub const NLM_F_DUMP: c_int = NLM_F_ROOT | NLM_F_MATCH;
+//
+pub const NLM_F_REPLACE: c_int = 0x100;
+pub const NLM_F_EXCL: c_int = 0x200;
+pub const NLM_F_CREATE: c_int = 0x400;
+pub const NLM_F_APPEND: c_int = 0x800;
+//
+pub const NLM_F_NONREC: c_int = 0x100;
+//
+pub const NLM_F_CAPPED: c_int = 0x100;
+pub const NLM_F_ACK_TLVS: c_int = 0x200;
+//
+pub const NLMSG_NOOP: c_int = 0x1;
+pub const NLMSG_ERROR: c_int = 0x2;
+pub const NLMSG_DONE: c_int = 0x3;
+pub const NLMSG_OVERRUN: c_int = 0x4;
+//
+pub const NETLINK_ROUTE: c_int = 0;
+pub const NETLINK_UNUSED: c_int = 1;
+pub const NETLINK_USERSOCK: c_int = 2;
+pub const NETLINK_FIREWALL: c_int = 3;
+pub const NETLINK_SOCK_DIAG: c_int = 4;
+pub const NETLINK_NFLOG: c_int = 5;
+pub const NETLINK_XFRM: c_int = 6;
+pub const NETLINK_SELINUX: c_int = 7;
+pub const NETLINK_ISCSI: c_int = 8;
+pub const NETLINK_AUDIT: c_int = 9;
+pub const NETLINK_FIB_LOOKUP: c_int = 10;
+pub const NETLINK_CONNECTOR: c_int = 11;
+pub const NETLINK_NETFILTER: c_int = 12;
+pub const NETLINK_IP6_FW: c_int = 13;
+pub const NETLINK_DNRTMSG: c_int = 14;
+pub const NETLINK_KOBJECT_UEVENT: c_int = 15;
+pub const NETLINK_GENERIC: c_int = 16;
+//
+const NL_ITEM_ALIGN_SIZE: c_int = 4; // mem::size_of::<u32>(); FIXME accept new dep?
+pub const NLMSG_ALIGNTO: c_int = NL_ITEM_ALIGN_SIZE;
+
+// netlink/netlink_generic.h
+pub const CTRL_CMD_UNSPEC: c_int = 0;
+pub const CTRL_CMD_NEWFAMILY: c_int = 1;
+pub const CTRL_CMD_DELFAMILY: c_int = 2;
+pub const CTRL_CMD_GETFAMILY: c_int = 3;
+pub const CTRL_CMD_NEWOPS: c_int = 4;
+pub const CTRL_CMD_DELOPS: c_int = 5;
+pub const CTRL_CMD_GETOPS: c_int = 6;
+pub const CTRL_CMD_NEWMCAST_GRP: c_int = 7;
+pub const CTRL_CMD_DELMCAST_GRP: c_int = 8;
+pub const CTRL_CMD_GETMCAST_GRP: c_int = 9;
+pub const CTRL_CMD_GETPOLICY: c_int = 10;
+//
+pub const CTRL_ATTR_UNSPEC: c_int = 0;
+pub const CTRL_ATTR_FAMILY_ID: c_int = 1;
+pub const CTRL_ATTR_FAMILY_NAME: c_int = 2;
+pub const CTRL_ATTR_VERSION: c_int = 3;
+pub const CTRL_ATTR_HDRSIZE: c_int = 4;
+pub const CTRL_ATTR_MAXATTR: c_int = 5;
+pub const CTRL_ATTR_OPS: c_int = 6;
+pub const CTRL_ATTR_MCAST_GROUPS: c_int = 7;
+pub const CTRL_ATTR_POLICY: c_int = 8;
+pub const CTRL_ATTR_OP_POLICY: c_int = 9;
+pub const CTRL_ATTR_OP: c_int = 10;
+//
+pub const CTRL_ATTR_MCAST_GRP_UNSPEC: c_int = 0;
+pub const CTRL_ATTR_MCAST_GRP_NAME: c_int = 1;
+pub const CTRL_ATTR_MCAST_GRP_ID: c_int = 2;