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//! Feature tests for OS functionality
pub use self::os::*;
#[cfg(any(target_os = "linux", target_os = "android"))]
mod os {
use crate::sys::utsname::uname;
// Features:
// * atomic cloexec on socket: 2.6.27
// * pipe2: 2.6.27
// * accept4: 2.6.28
static VERS_UNKNOWN: usize = 1;
static VERS_2_6_18: usize = 2;
static VERS_2_6_27: usize = 3;
static VERS_2_6_28: usize = 4;
static VERS_3: usize = 5;
#[inline]
fn digit(dst: &mut usize, b: u8) {
*dst *= 10;
*dst += (b - b'0') as usize;
}
fn parse_kernel_version() -> usize {
let u = uname();
let mut curr: usize = 0;
let mut major: usize = 0;
let mut minor: usize = 0;
let mut patch: usize = 0;
for b in u.release().bytes() {
if curr >= 3 {
break;
}
match b {
b'.' | b'-' => {
curr += 1;
}
b'0'..=b'9' => {
match curr {
0 => digit(&mut major, b),
1 => digit(&mut minor, b),
_ => digit(&mut patch, b),
}
}
_ => break,
}
}
if major >= 3 {
VERS_3
} else if major >= 2 {
if minor >= 7 {
VERS_UNKNOWN
} else if minor >= 6 {
if patch >= 28 {
VERS_2_6_28
} else if patch >= 27 {
VERS_2_6_27
} else {
VERS_2_6_18
}
} else {
VERS_UNKNOWN
}
} else {
VERS_UNKNOWN
}
}
fn kernel_version() -> usize {
static mut KERNEL_VERS: usize = 0;
unsafe {
if KERNEL_VERS == 0 {
KERNEL_VERS = parse_kernel_version();
}
KERNEL_VERS
}
}
/// Check if the OS supports atomic close-on-exec for sockets
pub fn socket_atomic_cloexec() -> bool {
kernel_version() >= VERS_2_6_27
}
#[test]
pub fn test_parsing_kernel_version() {
assert!(kernel_version() > 0);
}
}
#[cfg(any(target_os = "illumos"))]
mod os {
/// Check if the OS supports atomic close-on-exec for sockets
pub const fn socket_atomic_cloexec() -> bool {
true
}
}
#[cfg(any(target_os = "macos", target_os = "freebsd",
target_os = "dragonfly", target_os = "ios",
target_os = "openbsd", target_os = "netbsd",
target_os = "redox", target_os = "fuchsia",
target_os = "solaris"))]
mod os {
/// Check if the OS supports atomic close-on-exec for sockets
pub const fn socket_atomic_cloexec() -> bool {
false
}
}
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