library/std/src/sys/mod.rs

   1 //! Platform-dependent platform abstraction.
   2 //!
   3 //! The `std::sys` module is the abstracted interface through which
   4 //! `std` talks to the underlying operating system. It has different
   5 //! implementations for different operating system families, today
   6 //! just Unix and Windows, and initial support for Redox.
   7 //!
   8 //! The centralization of platform-specific code in this module is
   9 //! enforced by the "platform abstraction layer" tidy script in
  10 //! `tools/tidy/src/pal.rs`.
  11 //!
  12 //! This module is closely related to the platform-independent system
  13 //! integration code in `std::sys_common`. See that module's
  14 //! documentation for details.
  15 //!
  16 //! In the future it would be desirable for the independent
  17 //! implementations of this module to be extracted to their own crates
  18 //! that `std` can link to, thus enabling their implementation
  19 //! out-of-tree via crate replacement. Though due to the complex
  20 //! inter-dependencies within `std` that will be a challenging goal to
  21 //! achieve.
  22
  23 #![allow(missing_debug_implementations)]
  24
  25 cfg_if::cfg_if! {
  26     if #[cfg(target_os = "vxworks")] {
  27         mod vxworks;
  28         pub use self::vxworks::*;
  29     } else if #[cfg(unix)] {
  30         mod unix;
  31         pub use self::unix::*;
  32     } else if #[cfg(windows)] {
  33         mod windows;
  34         pub use self::windows::*;
  35     } else if #[cfg(target_os = "hermit")] {
  36         mod hermit;
  37         pub use self::hermit::*;
  38     } else if #[cfg(target_os = "wasi")] {
  39         mod wasi;
  40         pub use self::wasi::*;
  41     } else if #[cfg(target_arch = "wasm32")] {
  42         mod wasm;
  43         pub use self::wasm::*;
  44     } else if #[cfg(all(target_vendor = "fortanix", target_env = "sgx"))] {
  45         mod sgx;
  46         pub use self::sgx::*;
  47     } else {
  48         mod unsupported;
  49         pub use self::unsupported::*;
  50     }
  51 }
  52
  53 // Import essential modules from both platforms when documenting. These are
  54 // then later used in the `std::os` module when documenting, for example,
  55 // Windows when we're compiling for Linux.
  56
  57 #[cfg(doc)]
  58 cfg_if::cfg_if! {
  59     if #[cfg(unix)] {
  60         // On unix we'll document what's already available
  61         #[stable(feature = "rust1", since = "1.0.0")]
  62         pub use self::ext as unix_ext;
  63     } else if #[cfg(any(target_os = "hermit",
  64                         all(target_arch = "wasm32", not(target_os = "wasi")),
  65                         all(target_vendor = "fortanix", target_env = "sgx")))] {
  66         // On non-WASI wasm right now the module below doesn't compile
  67         // (missing things in `libc` which is empty) so just omit everything
  68         // with an empty module
  69         #[unstable(issue = "none", feature = "std_internals")]
  70         #[allow(missing_docs)]
  71         pub mod unix_ext {}
  72     } else {
  73         // On other platforms like Windows document the bare bones of unix
  74         use crate::os::linux as platform;
  75         #[path = "unix/ext/mod.rs"]
  76         pub mod unix_ext;
  77     }
  78 }
  79
  80 #[cfg(doc)]
  81 cfg_if::cfg_if! {
  82     if #[cfg(windows)] {
  83         // On windows we'll just be documenting what's already available
  84         #[allow(missing_docs)]
  85         #[stable(feature = "rust1", since = "1.0.0")]
  86         pub use self::ext as windows_ext;
  87     } else if #[cfg(any(target_os = "hermit",
  88                         all(target_arch = "wasm32", not(target_os = "wasi")),
  89                         all(target_vendor = "fortanix", target_env = "sgx")))] {
  90         // On non-WASI wasm right now the shim below doesn't compile, so
  91         // just omit it
  92         #[unstable(issue = "none", feature = "std_internals")]
  93         #[allow(missing_docs)]
  94         pub mod windows_ext {}
  95     } else {
  96         // On all other platforms (aka linux/osx/etc) then pull in a "minimal"
  97         // amount of windows goop which ends up compiling
  98         #[macro_use]
  99         #[path = "windows/compat.rs"]
 100         mod compat;
 101
 102         #[path = "windows/c.rs"]
 103         mod c;
 104
 105         #[path = "windows/ext/mod.rs"]
 106         pub mod windows_ext;
 107     }
 108 }
 109
 110 #[cfg(doc)]
 111 cfg_if::cfg_if! {
 112     if #[cfg(target_os = "wasi")] {
 113         // On WASI we'll document what's already available
 114         #[stable(feature = "wasi_ext_doc", since = "1.35.0")]
 115         pub use self::ext as wasi_ext;
 116     } else if #[cfg(any(target_os = "hermit",
 117                         target_arch = "wasm32",
 118                         all(target_vendor = "fortanix", target_env = "sgx")))] {
 119         // On non-WASI wasm right now the module below doesn't compile
 120         // (missing things in `libc` which is empty) so just omit everything
 121         // with an empty module
 122         #[unstable(issue = "none", feature = "std_internals")]
 123         #[allow(missing_docs)]
 124         pub mod wasi_ext {}
 125     } else {
 126         // On other platforms like Windows document the bare bones of WASI
 127         #[path = "wasi/ext/mod.rs"]
 128         #[stable(feature = "wasi_ext_doc", since = "1.35.0")]
 129         pub mod wasi_ext;
 130     }
 131 }