adding a handful of linux fanotify data types.

close #3688

libc-test/build.rs

@@ -3615,7 +3615,11 @@ fn test_linux(target: &str) {
             return true;
         }
         // FIXME: sparc64 CI has old headers
-        if sparc64 && (ty == "uinput_ff_erase" || ty == "uinput_abs_setup") {
+        if sparc64
+            && (ty == "uinput_ff_erase"
+                || ty == "uinput_abs_setup"
+                || ty == "fanotify_event_info_error")
+        {
             return true;
         }
         // FIXME(https://github.com/rust-lang/libc/issues/1558): passing by
@@ -4369,7 +4373,11 @@ fn test_linux(target: &str) {
         // the `ifr_ifrn` field is an anonymous union
         (struct_ == "iwreq" && field == "ifr_ifrn") ||
         // the `key` field is a zero-sized array
-        (struct_ == "iw_encode_ext" && field == "key")
+        (struct_ == "iw_encode_ext" && field == "key") ||
+        // either fsid_t or int[2] type
+        (struct_ == "fanotify_event_info_fid" && field == "fsid") ||
+        // `handle` is a VLA
+        (struct_ == "fanotify_event_info_fid" && field == "handle")
     });
 
     cfg.skip_roundtrip(move |s| match s {

libc-test/semver/linux-gnu.txt

@@ -621,6 +621,8 @@ dlinfo
 dlmopen
 endutxent
 explicit_bzero
+fanotify_event_info_error
+fanotify_event_info_pidfd
 fgetgrent_r
 fgetspent_r
 futimes

libc-test/semver/linux.txt

@@ -3537,6 +3537,7 @@ execvpe
 faccessat
 fallocate
 fallocate64
+fanotify_event_info_fid
 fanotify_event_metadata
 fanotify_init
 fanotify_mark

src/unix/linux_like/linux/align.rs

@@ -63,6 +63,13 @@ macro_rules! expand_align {
                 pub fd: ::c_int,
                 pub pid: ::c_int,
             }
+
+            #[repr(align(2))]
+            pub struct fanotify_event_info_header {
+                pub info_type: __u8,
+                pub pad: __u8,
+                pub len: __u16,
+            }
         }
 
         s_no_extra_traits! {

src/unix/linux_like/linux/gnu/mod.rs

@@ -453,6 +453,17 @@ s! {
         pub aio_flags: ::__u32,
         pub aio_resfd: ::__u32,
     }
+
+    pub struct fanotify_event_info_pidfd {
+        pub hdr: ::fanotify_event_info_header,
+        pub pidfd: ::__s32,
+    }
+
+    pub struct fanotify_event_info_error {
+        pub hdr: ::fanotify_event_info_header,
+        pub error: ::__s32,
+        pub error_count: ::__u32,
+    }
 }
 
 impl siginfo_t {

src/unix/linux_like/linux/mod.rs

@@ -16,6 +16,7 @@ pub type loff_t = ::c_longlong;
 pub type pthread_key_t = ::c_uint;
 pub type pthread_once_t = ::c_int;
 pub type pthread_spinlock_t = ::c_int;
+pub type __kernel_fsid_t = __c_anonymous__kernel_fsid_t;
 
 pub type __u8 = ::c_uchar;
 pub type __u16 = ::c_ushort;
@@ -590,6 +591,10 @@ s! {
         pub r_info: Elf64_Xword,
     }
 
+    pub struct __c_anonymous__kernel_fsid_t {
+        pub val: [::c_int; 2],
+    }
+
     pub struct ucred {
         pub pid: ::pid_t,
         pub uid: ::uid_t,
@@ -657,6 +662,12 @@ s! {
         pub response: __u32,
     }
 
+    pub struct fanotify_event_info_fid {
+        pub hdr: fanotify_event_info_header,
+        pub fsid: ::__kernel_fsid_t,
+        pub handle: [::c_uchar; 0],
+    }
+
     pub struct sockaddr_vm {
         pub svm_family: ::sa_family_t,
         pub svm_reserved1: ::c_ushort,