reboot api for openbsd

[CountryMegs]

on openbsd 7.4 trying to build the nix crate reboot feature. missing a bunch of stuff from libc. https://man.openbsd.org/reboot.2

can it be added please for amd64?

error[E0425]: cannot find value `RB_HALT_SYSTEM` in crate `libc`
  --> /nix/src/sys/reboot.rs:17:9
   |
17 |         RB_HALT_SYSTEM,
   |         ^^^^^^^^^^^^^^ not found in `libc`
   |
help: consider importing this unit variant
   |
3  + use crate::sys::reboot::RebootMode::RB_HALT_SYSTEM;
   |

error[E0425]: cannot find value `RB_KEXEC` in crate `libc`
  --> /nix/src/sys/reboot.rs:20:9
   |
20 |         RB_KEXEC,
   |         ^^^^^^^^ not found in `libc`
   |
help: consider importing this unit variant
   |
3  + use crate::sys::reboot::RebootMode::RB_KEXEC;
   |

error[E0425]: cannot find value `RB_POWER_OFF` in crate `libc`
  --> /nix/src/sys/reboot.rs:22:9
   |
22 |         RB_POWER_OFF,
   |         ^^^^^^^^^^^^ not found in `libc`
   |
help: consider importing this unit variant
   |
3  + use crate::sys::reboot::RebootMode::RB_POWER_OFF;
   |

error[E0425]: cannot find value `RB_AUTOBOOT` in crate `libc`
  --> /nix/src/sys/reboot.rs:24:9
   |
24 |         RB_AUTOBOOT,
   |         ^^^^^^^^^^^ not found in `libc`
   |
help: consider importing this unit variant
   |
3  + use crate::sys::reboot::RebootMode::RB_AUTOBOOT;
   |

error[E0425]: cannot find value `RB_SW_SUSPEND` in crate `libc`
  --> /nix/src/sys/reboot.rs:27:9
   |
27 |         RB_SW_SUSPEND,
   |         ^^^^^^^^^^^^^ not found in `libc`
   |
help: consider importing this unit variant
   |
3  + use crate::sys::reboot::RebootMode::RB_SW_SUSPEND;
   |

error[E0425]: cannot find function `reboot` in crate `libc`
  --> /nix/src/sys/reboot.rs:33:20
   |
33 |     unsafe { libc::reboot(how as libc::c_int) };
   |                    ^^^^^^ not found in `libc`

error[E0425]: cannot find value `RB_ENABLE_CAD` in crate `libc`
  --> /nix/src/sys/reboot.rs:42:15
   |
42 |         libc::RB_ENABLE_CAD
   |               ^^^^^^^^^^^^^ not found in `libc`

error[E0425]: cannot find value `RB_DISABLE_CAD` in crate `libc`
  --> /nix/src/sys/reboot.rs:44:15
   |
44 |         libc::RB_DISABLE_CAD
   |               ^^^^^^^^^^^^^^ not found in `libc`

error[E0425]: cannot find function `reboot` in crate `libc`
  --> /nix/src/sys/reboot.rs:46:30
   |
46 |     let res = unsafe { libc::reboot(cmd) };
   |                              ^^^^^^ not found in `libc`

For more information about this error, try `rustc --explain E0425`.
error: could not compile `nix` (lib) due to 9 previous errors

[SteveLauC]

Would you like to file a PR for these missing symbols? Then after a version of libc with these symbols included is released, we can add it to Nix :)

[CountryMegs]

@SteveLauC yes but i wouldnt know where to start with it. so open the issue in case someone does and wants to help in the meantime

[devnexen]

Feel free to open a PR, it s mostly a call and a handful of constants, someone will review nonetheless :)

[SteveLauC]

From your error info (which seems to be incomplete though), you have some missing constants and a function reboot to add, things for OpenBSD should be added to the files under this directory, if these things are not arch-dependent, then it should be added to mod.rs

Missing constants should go to this area

Missing function should go here