Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 264 insertions, 0 deletions

diff --git a/third_party/rust/nix/src/macros.rs b/third_party/rust/nix/src/macros.rs
new file mode 100644
index 0000000000..3d1b0e4b76
--- /dev/null
+++ b/third_party/rust/nix/src/macros.rs
@@ -0,0 +1,264 @@
+/// The `libc_bitflags!` macro helps with a common use case of defining a public bitflags type
+/// with values from the libc crate. It is used the same way as the `bitflags!` macro, except
+/// that only the name of the flag value has to be given.
+///
+/// The `libc` crate must be in scope with the name `libc`.
+///
+/// # Example
+/// ```
+/// libc_bitflags!{
+///     pub struct ProtFlags: libc::c_int {
+///         PROT_NONE;
+///         PROT_READ;
+///         /// PROT_WRITE enables write protect
+///         PROT_WRITE;
+///         PROT_EXEC;
+///         #[cfg(any(target_os = "linux", target_os = "android"))]
+///         PROT_GROWSDOWN;
+///         #[cfg(any(target_os = "linux", target_os = "android"))]
+///         PROT_GROWSUP;
+///     }
+/// }
+/// ```
+///
+/// Example with casting, due to a mistake in libc. In this example, the
+/// various flags have different types, so we cast the broken ones to the right
+/// type.
+///
+/// ```
+/// libc_bitflags!{
+///     pub struct SaFlags: libc::c_ulong {
+///         SA_NOCLDSTOP as libc::c_ulong;
+///         SA_NOCLDWAIT;
+///         SA_NODEFER as libc::c_ulong;
+///         SA_ONSTACK;
+///         SA_RESETHAND as libc::c_ulong;
+///         SA_RESTART as libc::c_ulong;
+///         SA_SIGINFO;
+///     }
+/// }
+/// ```
+macro_rules! libc_bitflags {
+    (
+        $(#[$outer:meta])*
+        pub struct $BitFlags:ident: $T:ty {
+            $(
+                $(#[$inner:ident $($args:tt)*])*
+                $Flag:ident $(as $cast:ty)*;
+            )+
+        }
+    ) => {
+        bitflags! {
+            $(#[$outer])*
+            pub struct $BitFlags: $T {
+                $(
+                    $(#[$inner $($args)*])*
+                    const $Flag = libc::$Flag $(as $cast)*;
+                )+
+            }
+        }
+    };
+}
+
+/// The `libc_enum!` macro helps with a common use case of defining an enum exclusively using
+/// values from the `libc` crate. This macro supports both `pub` and private `enum`s.
+///
+/// The `libc` crate must be in scope with the name `libc`.
+///
+/// # Example
+/// ```
+/// libc_enum!{
+///     pub enum ProtFlags {
+///         PROT_NONE,
+///         PROT_READ,
+///         PROT_WRITE,
+///         PROT_EXEC,
+///         #[cfg(any(target_os = "linux", target_os = "android"))]
+///         PROT_GROWSDOWN,
+///         #[cfg(any(target_os = "linux", target_os = "android"))]
+///         PROT_GROWSUP,
+///     }
+/// }
+/// ```
+macro_rules! libc_enum {
+    // (non-pub) Exit rule.
+    (@make_enum
+        {
+            name: $BitFlags:ident,
+            attrs: [$($attrs:tt)*],
+            entries: [$($entries:tt)*],
+        }
+    ) => {
+        $($attrs)*
+        #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
+        enum $BitFlags {
+            $($entries)*
+        }
+    };
+
+    // (pub) Exit rule.
+    (@make_enum
+        {
+            pub,
+            name: $BitFlags:ident,
+            attrs: [$($attrs:tt)*],
+            entries: [$($entries:tt)*],
+        }
+    ) => {
+        $($attrs)*
+        #[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
+        pub enum $BitFlags {
+            $($entries)*
+        }
+    };
+
+    // (non-pub) Done accumulating.
+    (@accumulate_entries
+        {
+            name: $BitFlags:ident,
+            attrs: $attrs:tt,
+        },
+        $entries:tt;
+    ) => {
+        libc_enum! {
+            @make_enum
+            {
+                name: $BitFlags,
+                attrs: $attrs,
+                entries: $entries,
+            }
+        }
+    };
+
+    // (pub) Done accumulating.
+    (@accumulate_entries
+        {
+            pub,
+            name: $BitFlags:ident,
+            attrs: $attrs:tt,
+        },
+        $entries:tt;
+    ) => {
+        libc_enum! {
+            @make_enum
+            {
+                pub,
+                name: $BitFlags,
+                attrs: $attrs,
+                entries: $entries,
+            }
+        }
+    };
+
+    // Munch an attr.
+    (@accumulate_entries
+        $prefix:tt,
+        [$($entries:tt)*];
+        #[$attr:meta] $($tail:tt)*
+    ) => {
+        libc_enum! {
+            @accumulate_entries
+            $prefix,
+            [
+                $($entries)*
+                #[$attr]
+            ];
+            $($tail)*
+        }
+    };
+
+    // Munch last ident if not followed by a comma.
+    (@accumulate_entries
+        $prefix:tt,
+        [$($entries:tt)*];
+        $entry:ident
+    ) => {
+        libc_enum! {
+            @accumulate_entries
+            $prefix,
+            [
+                $($entries)*
+                $entry = libc::$entry,
+            ];
+        }
+    };
+
+    // Munch an ident; covers terminating comma case.
+    (@accumulate_entries
+        $prefix:tt,
+        [$($entries:tt)*];
+        $entry:ident, $($tail:tt)*
+    ) => {
+        libc_enum! {
+            @accumulate_entries
+            $prefix,
+            [
+                $($entries)*
+                $entry = libc::$entry,
+            ];
+            $($tail)*
+        }
+    };
+
+    // Munch an ident and cast it to the given type; covers terminating comma.
+    (@accumulate_entries
+        $prefix:tt,
+        [$($entries:tt)*];
+        $entry:ident as $ty:ty, $($tail:tt)*
+    ) => {
+        libc_enum! {
+            @accumulate_entries
+            $prefix,
+            [
+                $($entries)*
+                $entry = libc::$entry as $ty,
+            ];
+            $($tail)*
+        }
+    };
+
+    // (non-pub) Entry rule.
+    (
+        $(#[$attr:meta])*
+        enum $BitFlags:ident {
+            $($vals:tt)*
+        }
+    ) => {
+        libc_enum! {
+            @accumulate_entries
+            {
+                name: $BitFlags,
+                attrs: [$(#[$attr])*],
+            },
+            [];
+            $($vals)*
+        }
+    };
+
+    // (pub) Entry rule.
+    (
+        $(#[$attr:meta])*
+        pub enum $BitFlags:ident {
+            $($vals:tt)*
+        }
+    ) => {
+        libc_enum! {
+            @accumulate_entries
+            {
+                pub,
+                name: $BitFlags,
+                attrs: [$(#[$attr])*],
+            },
+            [];
+            $($vals)*
+        }
+    };
+}
+
+/// A Rust version of the familiar C `offset_of` macro.  It returns the byte
+/// offset of `field` within struct `ty`
+macro_rules! offset_of {
+    ($ty:ty, $field:ident) => {
+        &(*(0 as *const $ty)).$field as *const _ as usize
+    }
+}