Add 'struct ld_info' and friends.

(backport <#4578>)
(cherry picked from commit 925eb0c)

Author: Xing Xue

libc-test/build.rs

@@ -5702,6 +5702,18 @@ fn test_aix(target: &str) {
             // allow type 'double' to be used in signal contexts.
             "fpreg_t" => true,
 
+            // This type is defined for a union used within `struct ld_info`.
+            // The AIX header does not declare a separate standalone union
+            // type for it.
+            "__ld_info_file" => true,
+
+            // This is a simplified version of the AIX union `_simple_lock`.
+            "_kernel_simple_lock" => true,
+
+            // These structures are guarded by the `_KERNEL` macro in the AIX
+            // header.
+            "fileops_t" | "file" => true,
+
             _ => false,
         }
     });
@@ -5719,6 +5731,11 @@ fn test_aix(target: &str) {
             // The _ALL_SOURCE type of 'f_fsid' differs from POSIX's on AIX.
             ("statvfs", "f_fsid") => true,
 
+            // The type of `_file` is `__ld_info_file`, which is defined
+            // specifically for the union inside `struct ld_info`. The AIX
+            // header does not define a separate standalone union type for it.
+            ("ld_info", "_file") => true,
+
             _ => false,
         }
     });

libc-test/semver/aix.txt

@@ -1791,12 +1791,14 @@ _W_STOPPED
 _W_STRC
 __context64
 __extctx_t
+__ld_info_file
 __pollfd_ext_u
 __tm_context_t
 __vmx_context_t
 __vmxreg_t
 __vsx_context_t
 _exit
+_kernel_simple_lock
 abort
 accept
 access
@@ -1915,7 +1917,9 @@ fgetpos
 fgetpos64
 fgetpwent
 fgets
+file
 fileno
+fileops_t
 flock
 flock64
 fnmatch
@@ -2079,6 +2083,7 @@ kill
 lchown
 lcong48
 lconv
+ld_info
 lfind
 linger
 link
@@ -2090,6 +2095,7 @@ locale_t
 localeconv
 localtime
 localtime_r
+lock_data_instrumented
 lpar_get_info
 lpar_set_resources
 lrand48

src/unix/aix/powerpc64.rs

@@ -1,6 +1,12 @@
 use crate::off_t;
 use crate::prelude::*;
 
+// Define lock_data_instrumented as an empty enum
+missing! {
+    #[cfg_attr(feature = "extra_traits", derive(Debug))]
+    pub enum lock_data_instrumented {}
+}
+
 s! {
     pub struct sigset_t {
         pub ss_set: [c_ulong; 4],
@@ -256,6 +262,74 @@ s_no_extra_traits! {
         pub __pad: [c_int; 3],
     }
 
+    pub union _kernel_simple_lock {
+        pub _slock: c_long,
+        pub _slockp: *mut lock_data_instrumented,
+    }
+
+    pub struct fileops_t {
+        pub fo_rw: Option<
+            extern "C" fn(
+                file: *mut file,
+                rw: crate::uio_rw,
+                io: *mut c_void,
+                ext: c_long,
+                secattr: *mut c_void,
+            ) -> c_int,
+        >,
+        pub fo_ioctl: Option<
+            extern "C" fn(
+                file: *mut file,
+                a: c_long,
+                b: crate::caddr_t,
+                c: c_long,
+                d: c_long,
+            ) -> c_int,
+        >,
+        pub fo_select: Option<
+            extern "C" fn(file: *mut file, a: c_int, b: *mut c_ushort, c: extern "C" fn()) -> c_int,
+        >,
+        pub fo_close: Option<extern "C" fn(file: *mut file) -> c_int>,
+        pub fo_fstat: Option<extern "C" fn(file: *mut file, sstat: *mut crate::stat) -> c_int>,
+    }
+
+    pub struct file {
+        pub f_flag: c_long,
+        pub f_count: c_int,
+        pub f_options: c_short,
+        pub f_type: c_short,
+        // Should be pointer to 'vnode'
+        pub f_data: *mut c_void,
+        pub f_offset: c_longlong,
+        pub f_dir_off: c_long,
+        // Should be pointer to 'cred'
+        pub f_cred: *mut c_void,
+        pub f_lock: _kernel_simple_lock,
+        pub f_offset_lock: _kernel_simple_lock,
+        pub f_vinfo: crate::caddr_t,
+        pub f_ops: *mut fileops_t,
+        pub f_parentp: crate::caddr_t,
+        pub f_fnamep: crate::caddr_t,
+        pub f_fdata: [c_char; 160],
+    }
+
+    pub union __ld_info_file {
+        pub _ldinfo_fd: c_int,
+        pub _ldinfo_fp: *mut file,
+        pub _core_offset: c_long,
+    }
+
+    pub struct ld_info {
+        pub ldinfo_next: c_uint,
+        pub ldinfo_flags: c_uint,
+        pub _file: __ld_info_file,
+        pub ldinfo_textorg: *mut c_void,
+        pub ldinfo_textsize: c_ulong,
+        pub ldinfo_dataorg: *mut c_void,
+        pub ldinfo_datasize: c_ulong,
+        pub ldinfo_filename: [c_char; 2],
+    }
+
     pub union __pollfd_ext_u {
         pub addr: *mut c_void,
         pub data32: u32,
@@ -327,6 +401,7 @@ cfg_if! {
                 self.__si_flags.hash(state);
             }
         }
+
         impl PartialEq for __pollfd_ext_u {
             fn eq(&self, other: &__pollfd_ext_u) -> bool {
                 unsafe {