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//! Uname and other system-level functions.
//!
//! # Safety
//!
//! This function converts from `struct utsname` fields provided from the
//! kernel into `&str` references, which assumes that they're NUL-terminated.
#![allow(unsafe_code)]
use crate::backend;
use crate::ffi::CStr;
#[cfg(not(target_os = "emscripten"))]
use crate::io;
use core::fmt;
#[cfg(linux_kernel)]
pub use backend::system::types::Sysinfo;
/// `uname()`—Returns high-level information about the runtime OS and
/// hardware.
///
/// # References
/// - [POSIX]
/// - [Linux]
///
/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/uname.html
/// [Linux]: https://man7.org/linux/man-pages/man2/uname.2.html
#[inline]
pub fn uname() -> Uname {
Uname(backend::system::syscalls::uname())
}
/// `struct utsname`—Return type for [`uname`].
#[doc(alias = "utsname")]
pub struct Uname(backend::system::types::RawUname);
impl Uname {
/// `sysname`—Operating system release name
#[inline]
pub fn sysname(&self) -> &CStr {
Self::to_cstr(self.0.sysname.as_ptr().cast())
}
/// `nodename`—Name with vague meaning
///
/// This is intended to be a network name, however it's unable to convey
/// information about hosts that have multiple names, or any information
/// about where the names are visible.
#[inline]
pub fn nodename(&self) -> &CStr {
Self::to_cstr(self.0.nodename.as_ptr().cast())
}
/// `release`—Operating system release version string
#[inline]
pub fn release(&self) -> &CStr {
Self::to_cstr(self.0.release.as_ptr().cast())
}
/// `version`—Operating system build identifiers
#[inline]
pub fn version(&self) -> &CStr {
Self::to_cstr(self.0.version.as_ptr().cast())
}
/// `machine`—Hardware architecture identifier
#[inline]
pub fn machine(&self) -> &CStr {
Self::to_cstr(self.0.machine.as_ptr().cast())
}
/// `domainname`—NIS or YP domain identifier
#[cfg(linux_kernel)]
#[inline]
pub fn domainname(&self) -> &CStr {
Self::to_cstr(self.0.domainname.as_ptr().cast())
}
#[inline]
fn to_cstr<'a>(ptr: *const u8) -> &'a CStr {
// SAFETY: Strings returned from the kernel are always NUL-terminated.
unsafe { CStr::from_ptr(ptr.cast()) }
}
}
impl fmt::Debug for Uname {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
#[cfg(not(linux_kernel))]
{
write!(
fmt,
"{} {} {} {} {}",
self.sysname().to_string_lossy(),
self.nodename().to_string_lossy(),
self.release().to_string_lossy(),
self.version().to_string_lossy(),
self.machine().to_string_lossy(),
)
}
#[cfg(linux_kernel)]
{
write!(
fmt,
"{} {} {} {} {} {}",
self.sysname().to_string_lossy(),
self.nodename().to_string_lossy(),
self.release().to_string_lossy(),
self.version().to_string_lossy(),
self.machine().to_string_lossy(),
self.domainname().to_string_lossy(),
)
}
}
}
/// `sysinfo()`—Returns status information about the runtime OS.
///
/// # References
/// - [Linux]
///
/// [Linux]: https://man7.org/linux/man-pages/man2/uname.2.html
#[cfg(linux_kernel)]
#[inline]
pub fn sysinfo() -> Sysinfo {
backend::system::syscalls::sysinfo()
}
/// `sethostname(name)`—Sets the system host name.
///
/// # References
/// - [Linux]
///
/// [Linux]: https://man7.org/linux/man-pages/man2/sethostname.2.html
#[cfg(not(any(target_os = "emscripten", target_os = "redox", target_os = "wasi")))]
#[inline]
pub fn sethostname(name: &[u8]) -> io::Result<()> {
backend::system::syscalls::sethostname(name)
}
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