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use super::super::c;
#[cfg(any(
all(target_os = "android", target_pointer_width = "64"),
target_os = "linux",
))]
use crate::ffi::CStr;
// `getauxval` wasn't supported in glibc until 2.16.
#[cfg(any(
all(target_os = "android", target_pointer_width = "64"),
target_os = "linux",
))]
weak!(fn getauxval(c::c_ulong) -> *mut c::c_void);
#[inline]
pub(crate) fn page_size() -> usize {
unsafe { c::sysconf(c::_SC_PAGESIZE) as usize }
}
#[cfg(not(target_os = "wasi"))]
#[inline]
pub(crate) fn clock_ticks_per_second() -> u64 {
unsafe { c::sysconf(c::_SC_CLK_TCK) as u64 }
}
#[cfg(any(
all(target_os = "android", target_pointer_width = "64"),
target_os = "linux",
))]
#[inline]
pub(crate) fn linux_hwcap() -> (usize, usize) {
if let Some(libc_getauxval) = getauxval.get() {
unsafe {
let hwcap = libc_getauxval(c::AT_HWCAP) as usize;
let hwcap2 = libc_getauxval(c::AT_HWCAP2) as usize;
(hwcap, hwcap2)
}
} else {
(0, 0)
}
}
#[cfg(any(
all(target_os = "android", target_pointer_width = "64"),
target_os = "linux",
))]
#[inline]
pub(crate) fn linux_execfn() -> &'static CStr {
if let Some(libc_getauxval) = getauxval.get() {
unsafe { CStr::from_ptr(libc_getauxval(c::AT_EXECFN).cast()) }
} else {
cstr!("")
}
}
/// Initialize process-wide state.
#[cfg(any(
target_vendor = "mustang",
not(any(target_env = "gnu", target_env = "musl")),
))]
#[inline]
#[doc(hidden)]
pub(crate) unsafe fn init(_envp: *mut *mut u8) {
// Nothing to do. This is the libc backend, and libc does the
// initialization for us.
}
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