adding a handful of linux fanotify data types.

close rust-lang#3688

(backport <rust-lang#3695>)
(cherry picked from commit 7b338f9)

libc-test/build.rs

@@ -3746,6 +3746,9 @@ fn test_linux(target: &str) {
         if musl && ty == "fanout_args" {
             return true;
         }
+        if sparc64 && ty == "fanotify_event_info_error" {
+            return true;
+        }
 
         match ty {
             // These cannot be tested when "resolv.h" is included and are tested
@@ -4490,7 +4493,11 @@ fn test_linux(target: &str) {
         // the `tcpi_delivery_rate_app_limited` field is a bitfield on musl
         (musl && struct_ == "tcp_info" && field == "tcpi_delivery_rate_app_limited") ||
         // the `tcpi_fast_open_client_fail` field is a bitfield on musl
-        (musl && struct_ == "tcp_info" && field == "tcpi_fast_open_client_fail")
+        (musl && struct_ == "tcp_info" && field == "tcpi_fast_open_client_fail") ||
+        // 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

@@ -628,12 +628,15 @@ dlinfo
 dlmopen
 endutxent
 explicit_bzero
+fanotify_event_info_error
+fanotify_event_info_header
+fanotify_event_info_pidfd
+fgetgrent_r
 fgetspent_r
 futimes
 getauxval
 getentropy
 getgrent_r
-fgetgrent_r
 getloadavg
 getpt
 getpwent_r

libc-test/semver/linux.txt

@@ -3497,6 +3497,7 @@ execvpe
 faccessat
 fallocate
 fallocate64
+fanotify_event_info_fid
 fanotify_event_metadata
 fanotify_init
 fanotify_mark

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

@@ -492,6 +492,17 @@ s! {
         pub tcpi_rcv_space: u32,
         pub tcpi_total_retrans: 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;
@@ -548,6 +549,20 @@ s! {
         pub sh_entsize: Elf64_Xword,
     }
 
+    pub struct __c_anonymous_elf32_rel {
+        pub r_offset: Elf32_Addr,
+        pub r_info: Elf32_Word,
+    }
+
+    pub struct __c_anonymous_elf64_rel {
+        pub r_offset: Elf64_Addr,
+        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,
@@ -615,6 +630,18 @@ s! {
         pub response: __u32,
     }
 
+    pub struct fanotify_event_info_header {
+        pub info_type: __u8,
+        pub pad: __u8,
+        pub len: __u16,
+    }
+
+    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,