Build error on Windows MSVC

[mbrubeck]

Building sig 1.0.0 on x86_64-pc-windows-msvc failed with these errors:

   Compiling sig v1.0.0
     Running `rustc --crate-name sig C:\projects\servo\.cargo\registry\src\github.com-1ecc6299db9ec823\sig-1.0.0\src\lib.rs --crate-type lib --emit=dep-info,link -C codegen-units=4 -C debuginfo=2 -C metadata=3190650705672a48 -C extra-filename=-3190650705672a48 --out-dir C:\projects\servo\target\debug\deps -L dependency=C:\projects\servo\target\debug\deps --extern libc=C:\projects\servo\target\debug\deps\liblibc-462a4e4826bc7826.rlib --cap-lints allow -W unused-extern-crates`
error[E0432]: unresolved import `libc::pid_t`
 --> C:\projects\servo\.cargo\registry\src\github.com-1ecc6299db9ec823\sig-1.0.0\src\ffi.rs:8:16
  |
8 | pub use libc::{pid_t, c_int, getpid, kill};
  |                ^^^^^ no `pid_t` in the root
error[E0432]: unresolved import `libc::kill`
 --> C:\projects\servo\.cargo\registry\src\github.com-1ecc6299db9ec823\sig-1.0.0\src\ffi.rs:8:38
  |
8 | pub use libc::{pid_t, c_int, getpid, kill};
  |                                      ^^^^ no `kill` in the root
error[E0432]: unresolved import `libc::sigaction`
  --> C:\projects\servo\.cargo\registry\src\github.com-1ecc6299db9ec823\sig-1.0.0\src\lib.rs:27:12
   |
27 | use libc::{sigaction, sighandler_t, sigfillset};
   |            ^^^^^^^^^ no `sigaction` in the root
error[E0432]: unresolved import `libc::sighandler_t`
  --> C:\projects\servo\.cargo\registry\src\github.com-1ecc6299db9ec823\sig-1.0.0\src\lib.rs:27:23
   |
27 | use libc::{sigaction, sighandler_t, sigfillset};
   |                       ^^^^^^^^^^^^ no `sighandler_t` in the root
error[E0432]: unresolved import `libc::sigfillset`
  --> C:\projects\servo\.cargo\registry\src\github.com-1ecc6299db9ec823\sig-1.0.0\src\lib.rs:27:37
   |
27 | use libc::{sigaction, sighandler_t, sigfillset};
   |                                     ^^^^^^^^^^ no `sigfillset` in the root
error

[adjivas]

@mbrubeck: Hello, unfortunately, I haven't a windows's operating system, it's why I can't solve this issue by myself.

[mbrubeck]

Me either, unfortunately. The error above is from AppVeyor CI. For reference in case anyone else runs into this issue, sig 0.1.1 builds successfully on Windows.

[steveklabnik]

I believe that kill doesn't exist on windows?

[henninglive]

You can only use a very limited set of POSIX symbols on windows. The MSVC toolchains links against api-ms-win-crt-runtime-l1-1-0.dll and the GNU MinGW toolchain links against msvcrt.dll. none of these DLLs export the these symbols. They do export signal() , but it doesn’t do anything. Windows doesn’t have anything equivalent to POSIX signal handling, but it is possible to set a ctrl-c handler. This crate should probably use #[cfg(unix)] to conditionally export its functions based on if the system is Unix or not.

Here is what’s available on windows:
x86_64-pc-windows-msv
x86_64-pc-windows-gnu