linux add ptrace_syscall_info ptrace query.

closes #1920

libc-test/build.rs

@@ -3325,7 +3325,9 @@ fn test_linux(target: &str) {
         // FIXME: It now takes mode_t since glibc 2.31 on some targets.
         (struct_ == "ipc_perm" && field == "mode"
             && ((x86_64 || i686 || arm || riscv64) && gnu || x86_64_gnux32)
-        )
+        ) ||
+        // the `u` field is in fact an anonymous union
+        (gnu && struct_ == "ptrace_syscall_info" && (field == "u" || field == "pad"))
     });
 
     cfg.skip_roundtrip(move |s| match s {

libc-test/semver/linux-gnu.txt

@@ -350,6 +350,7 @@ PF_MPLS
 PF_XDP
 PROC_SUPER_MAGIC
 PTHREAD_MUTEX_ADAPTIVE_NP
+PTRACE_GET_SYSCALL_INFO
 QNX4_SUPER_MAGIC
 QNX6_SUPER_MAGIC
 RDTGROUP_SUPER_MAGIC
@@ -617,6 +618,7 @@ pthread_rwlockattr_getpshared
 pthread_rwlockattr_setkind_np
 pthread_setname_np
 ptrace_peeksiginfo_args
+ptrace_syscall_info
 pututxline
 pwritev2
 pwritev64

src/unix/linux_like/linux/gnu/b32/mod.rs

@@ -11,6 +11,7 @@ pub type msgqnum_t = ::c_ulong;
 pub type msglen_t = ::c_ulong;
 pub type nlink_t = u32;
 pub type __u64 = ::c_ulonglong;
+pub type __s64 = ::c_longlong;
 pub type __fsword_t = i32;
 pub type fsblkcnt64_t = u64;
 pub type fsfilcnt64_t = u64;

src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs

@@ -6,6 +6,7 @@ pub type nlink_t = u32;
 pub type blksize_t = i32;
 pub type suseconds_t = i64;
 pub type __u64 = ::c_ulonglong;
+pub type __s64 = ::c_longlong;
 
 s! {
     pub struct sigaction {

src/unix/linux_like/linux/gnu/b64/mips64/mod.rs

@@ -8,6 +8,7 @@ pub type nlink_t = u64;
 pub type suseconds_t = i64;
 pub type wchar_t = i32;
 pub type __u64 = ::c_ulong;
+pub type __s64 = ::c_long;
 
 s! {
     pub struct stat {

src/unix/linux_like/linux/gnu/b64/powerpc64/mod.rs

@@ -10,6 +10,7 @@ pub type nlink_t = u64;
 pub type blksize_t = i64;
 pub type suseconds_t = i64;
 pub type __u64 = ::c_ulong;
+pub type __s64 = ::c_long;
 
 s! {
     pub struct sigaction {

src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs

@@ -11,6 +11,7 @@ pub type fsblkcnt64_t = ::c_ulong;
 pub type fsfilcnt64_t = ::c_ulong;
 pub type suseconds_t = i64;
 pub type __u64 = ::c_ulonglong;
+pub type __s64 = ::c_longlong;
 
 s! {
     pub struct pthread_attr_t {

src/unix/linux_like/linux/gnu/b64/s390x.rs

@@ -11,6 +11,7 @@ pub type suseconds_t = i64;
 pub type wchar_t = i32;
 pub type greg_t = u64;
 pub type __u64 = u64;
+pub type __s64 = i64;
 
 s! {
     pub struct sigaction {

src/unix/linux_like/linux/gnu/b64/sparc64/mod.rs

@@ -10,6 +10,7 @@ pub type nlink_t = u32;
 pub type blksize_t = i64;
 pub type suseconds_t = i32;
 pub type __u64 = ::c_ulonglong;
+pub type __s64 = ::c_longlong;
 
 s! {
     pub struct sigaction {

src/unix/linux_like/linux/gnu/b64/x86_64/mod.rs

@@ -7,6 +7,7 @@ pub type blksize_t = i64;
 pub type greg_t = i64;
 pub type suseconds_t = i64;
 pub type __u64 = ::c_ulonglong;
+pub type __s64 = ::c_longlong;
 
 s! {
     pub struct sigaction {

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

@@ -324,6 +324,32 @@ s! {
         pub flags: ::__u32,
         pub nr: ::__s32,
     }
+
+    pub struct __c_anonymous_ptrace_syscall_info_entry {
+        pub nr: ::__u64,
+        pub args: [::__u64; 6],
+    }
+
+    pub struct __c_anonymous_ptrace_syscall_info_exit {
+        pub sval: ::__s64,
+        pub is_error: ::__u8,
+    }
+
+    pub struct __c_anonymous_ptrace_syscall_info_seccomp {
+        pub nr: ::__u64,
+        pub args: [::__u64; 6],
+        pub ret_data: ::__u32,
+    }
+
+    pub struct ptrace_syscall_info {
+        pub op: ::__u8,
+        pub pad: [::__u8; 3],
+        pub arch: ::__u32,
+        pub instruction_pointer: ::__u64,
+        pub stack_pointer: ::__u64,
+        #[cfg(libc_union)]
+        pub u: __c_anonymous_ptrace_syscall_info_data,
+    }
 }
 
 impl siginfo_t {
@@ -411,6 +437,18 @@ cfg_if! {
                 self.sifields().sigchld.si_stime
             }
         }
+
+        pub union __c_anonymous_ptrace_syscall_info_data {
+            pub entry: __c_anonymous_ptrace_syscall_info_entry,
+            pub exit: __c_anonymous_ptrace_syscall_info_exit,
+            pub seccomp: __c_anonymous_ptrace_syscall_info_seccomp,
+        }
+        impl ::Copy for __c_anonymous_ptrace_syscall_info_data {}
+        impl ::Clone for __c_anonymous_ptrace_syscall_info_data {
+            fn clone(&self) -> __c_anonymous_ptrace_syscall_info_data {
+                *self
+            }
+        }
     }
 }
 
@@ -509,6 +547,44 @@ cfg_if! {
                 self.__glibc_reserved.hash(state);
             }
         }
+
+        #[cfg(libc_union)]
+        impl PartialEq for __c_anonymous_ptrace_syscall_info_data {
+            fn eq(&self, other: &__c_anonymous_ptrace_syscall_info_data) -> bool {
+                unsafe {
+                self.entry == other.entry ||
+                    self.exit == other.exit ||
+                    self.seccomp == other.seccomp
+                }
+            }
+        }
+
+        #[cfg(libc_union)]
+        impl Eq for __c_anonymous_ptrace_syscall_info_data {}
+
+        #[cfg(libc_union)]
+        impl ::fmt::Debug for __c_anonymous_ptrace_syscall_info_data {
+            fn fmt(&self, f: &mut ::fmt::Formatter) -> ::fmt::Result {
+                unsafe {
+                f.debug_struct("__c_anonymous_ptrace_syscall_info_data")
+                    .field("entry", &self.entry)
+                    .field("exit", &self.exit)
+                    .field("seccomp", &self.seccomp)
+                    .finish()
+                }
+            }
+        }
+
+        #[cfg(libc_union)]
+        impl ::hash::Hash for __c_anonymous_ptrace_syscall_info_data {
+            fn hash<H: ::hash::Hasher>(&self, state: &mut H) {
+                unsafe {
+                self.entry.hash(state);
+                self.exit.hash(state);
+                self.seccomp.hash(state);
+                }
+            }
+        }
     }
 }
 
@@ -906,6 +982,7 @@ pub const PTRACE_SEIZE: ::c_uint = 0x4206;
 pub const PTRACE_INTERRUPT: ::c_uint = 0x4207;
 pub const PTRACE_LISTEN: ::c_uint = 0x4208;
 pub const PTRACE_PEEKSIGINFO: ::c_uint = 0x4209;
+pub const PTRACE_GET_SYSCALL_INFO: ::c_uint = 0x420e;
 
 // linux/fs.h