| //! Implementation of `std::os` functionality for unix systems |
| |
| #![allow(unused_imports)] // lots of cfg code here |
| |
| #[cfg(test)] |
| mod tests; |
| |
| use crate::os::unix::prelude::*; |
| |
| use crate::convert::TryFrom; |
| use crate::error::Error as StdError; |
| use crate::ffi::{CStr, CString, OsStr, OsString}; |
| use crate::fmt; |
| use crate::io; |
| use crate::iter; |
| use crate::mem; |
| use crate::path::{self, PathBuf}; |
| use crate::ptr; |
| use crate::slice; |
| use crate::str; |
| use crate::sync::{PoisonError, RwLock}; |
| use crate::sys::common::small_c_string::{run_path_with_cstr, run_with_cstr}; |
| use crate::sys::cvt; |
| use crate::sys::fd; |
| use crate::sys::memchr; |
| use crate::vec; |
| |
| #[cfg(all(target_env = "gnu", not(target_os = "vxworks")))] |
| use crate::sys::weak::weak; |
| |
| use libc::{c_char, c_int, c_void}; |
| |
| const TMPBUF_SZ: usize = 128; |
| |
| cfg_if::cfg_if! { |
| if #[cfg(target_os = "redox")] { |
| const PATH_SEPARATOR: u8 = b';'; |
| } else { |
| const PATH_SEPARATOR: u8 = b':'; |
| } |
| } |
| |
| extern "C" { |
| #[cfg(not(any(target_os = "dragonfly", target_os = "vxworks")))] |
| #[cfg_attr( |
| any( |
| target_os = "linux", |
| target_os = "emscripten", |
| target_os = "fuchsia", |
| target_os = "l4re" |
| ), |
| link_name = "__errno_location" |
| )] |
| #[cfg_attr( |
| any( |
| target_os = "netbsd", |
| target_os = "openbsd", |
| target_os = "android", |
| target_os = "redox", |
| target_env = "newlib" |
| ), |
| link_name = "__errno" |
| )] |
| #[cfg_attr(any(target_os = "solaris", target_os = "illumos"), link_name = "___errno")] |
| #[cfg_attr( |
| any(target_os = "macos", target_os = "ios", target_os = "freebsd", target_os = "watchos"), |
| link_name = "__error" |
| )] |
| #[cfg_attr(target_os = "haiku", link_name = "_errnop")] |
| fn errno_location() -> *mut c_int; |
| } |
| |
| /// Returns the platform-specific value of errno |
| #[cfg(not(any(target_os = "dragonfly", target_os = "vxworks")))] |
| pub fn errno() -> i32 { |
| unsafe { (*errno_location()) as i32 } |
| } |
| |
| /// Sets the platform-specific value of errno |
| #[cfg(all(not(target_os = "dragonfly"), not(target_os = "vxworks")))] // needed for readdir and syscall! |
| #[allow(dead_code)] // but not all target cfgs actually end up using it |
| pub fn set_errno(e: i32) { |
| unsafe { *errno_location() = e as c_int } |
| } |
| |
| #[cfg(target_os = "vxworks")] |
| pub fn errno() -> i32 { |
| unsafe { libc::errnoGet() } |
| } |
| |
| #[cfg(target_os = "dragonfly")] |
| pub fn errno() -> i32 { |
| extern "C" { |
| #[thread_local] |
| static errno: c_int; |
| } |
| |
| unsafe { errno as i32 } |
| } |
| |
| #[cfg(target_os = "dragonfly")] |
| #[allow(dead_code)] |
| pub fn set_errno(e: i32) { |
| extern "C" { |
| #[thread_local] |
| static mut errno: c_int; |
| } |
| |
| unsafe { |
| errno = e; |
| } |
| } |
| |
| /// Gets a detailed string description for the given error number. |
| pub fn error_string(errno: i32) -> String { |
| extern "C" { |
| #[cfg_attr(any(target_os = "linux", target_env = "newlib"), link_name = "__xpg_strerror_r")] |
| fn strerror_r(errnum: c_int, buf: *mut c_char, buflen: libc::size_t) -> c_int; |
| } |
| |
| let mut buf = [0 as c_char; TMPBUF_SZ]; |
| |
| let p = buf.as_mut_ptr(); |
| unsafe { |
| if strerror_r(errno as c_int, p, buf.len()) < 0 { |
| panic!("strerror_r failure"); |
| } |
| |
| let p = p as *const _; |
| // We can't always expect a UTF-8 environment. When we don't get that luxury, |
| // it's better to give a low-quality error message than none at all. |
| String::from_utf8_lossy(CStr::from_ptr(p).to_bytes()).into() |
| } |
| } |
| |
| #[cfg(target_os = "espidf")] |
| pub fn getcwd() -> io::Result<PathBuf> { |
| Ok(PathBuf::from("/")) |
| } |
| |
| #[cfg(not(target_os = "espidf"))] |
| pub fn getcwd() -> io::Result<PathBuf> { |
| let mut buf = Vec::with_capacity(512); |
| loop { |
| unsafe { |
| let ptr = buf.as_mut_ptr() as *mut libc::c_char; |
| if !libc::getcwd(ptr, buf.capacity()).is_null() { |
| let len = CStr::from_ptr(buf.as_ptr() as *const libc::c_char).to_bytes().len(); |
| buf.set_len(len); |
| buf.shrink_to_fit(); |
| return Ok(PathBuf::from(OsString::from_vec(buf))); |
| } else { |
| let error = io::Error::last_os_error(); |
| if error.raw_os_error() != Some(libc::ERANGE) { |
| return Err(error); |
| } |
| } |
| |
| // Trigger the internal buffer resizing logic of `Vec` by requiring |
| // more space than the current capacity. |
| let cap = buf.capacity(); |
| buf.set_len(cap); |
| buf.reserve(1); |
| } |
| } |
| } |
| |
| #[cfg(target_os = "espidf")] |
| pub fn chdir(p: &path::Path) -> io::Result<()> { |
| super::unsupported::unsupported() |
| } |
| |
| #[cfg(not(target_os = "espidf"))] |
| pub fn chdir(p: &path::Path) -> io::Result<()> { |
| let result = run_path_with_cstr(p, |p| unsafe { Ok(libc::chdir(p.as_ptr())) })?; |
| if result == 0 { Ok(()) } else { Err(io::Error::last_os_error()) } |
| } |
| |
| pub struct SplitPaths<'a> { |
| iter: iter::Map<slice::Split<'a, u8, fn(&u8) -> bool>, fn(&'a [u8]) -> PathBuf>, |
| } |
| |
| pub fn split_paths(unparsed: &OsStr) -> SplitPaths<'_> { |
| fn bytes_to_path(b: &[u8]) -> PathBuf { |
| PathBuf::from(<OsStr as OsStrExt>::from_bytes(b)) |
| } |
| fn is_separator(b: &u8) -> bool { |
| *b == PATH_SEPARATOR |
| } |
| let unparsed = unparsed.as_bytes(); |
| SplitPaths { |
| iter: unparsed |
| .split(is_separator as fn(&u8) -> bool) |
| .map(bytes_to_path as fn(&[u8]) -> PathBuf), |
| } |
| } |
| |
| impl<'a> Iterator for SplitPaths<'a> { |
| type Item = PathBuf; |
| fn next(&mut self) -> Option<PathBuf> { |
| self.iter.next() |
| } |
| fn size_hint(&self) -> (usize, Option<usize>) { |
| self.iter.size_hint() |
| } |
| } |
| |
| #[derive(Debug)] |
| pub struct JoinPathsError; |
| |
| pub fn join_paths<I, T>(paths: I) -> Result<OsString, JoinPathsError> |
| where |
| I: Iterator<Item = T>, |
| T: AsRef<OsStr>, |
| { |
| let mut joined = Vec::new(); |
| |
| for (i, path) in paths.enumerate() { |
| let path = path.as_ref().as_bytes(); |
| if i > 0 { |
| joined.push(PATH_SEPARATOR) |
| } |
| if path.contains(&PATH_SEPARATOR) { |
| return Err(JoinPathsError); |
| } |
| joined.extend_from_slice(path); |
| } |
| Ok(OsStringExt::from_vec(joined)) |
| } |
| |
| impl fmt::Display for JoinPathsError { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| write!(f, "path segment contains separator `{}`", char::from(PATH_SEPARATOR)) |
| } |
| } |
| |
| impl StdError for JoinPathsError { |
| #[allow(deprecated)] |
| fn description(&self) -> &str { |
| "failed to join paths" |
| } |
| } |
| |
| #[cfg(any(target_os = "freebsd", target_os = "dragonfly"))] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| unsafe { |
| let mut mib = [ |
| libc::CTL_KERN as c_int, |
| libc::KERN_PROC as c_int, |
| libc::KERN_PROC_PATHNAME as c_int, |
| -1 as c_int, |
| ]; |
| let mut sz = 0; |
| cvt(libc::sysctl( |
| mib.as_mut_ptr(), |
| mib.len() as libc::c_uint, |
| ptr::null_mut(), |
| &mut sz, |
| ptr::null_mut(), |
| 0, |
| ))?; |
| if sz == 0 { |
| return Err(io::Error::last_os_error()); |
| } |
| let mut v: Vec<u8> = Vec::with_capacity(sz); |
| cvt(libc::sysctl( |
| mib.as_mut_ptr(), |
| mib.len() as libc::c_uint, |
| v.as_mut_ptr() as *mut libc::c_void, |
| &mut sz, |
| ptr::null_mut(), |
| 0, |
| ))?; |
| if sz == 0 { |
| return Err(io::Error::last_os_error()); |
| } |
| v.set_len(sz - 1); // chop off trailing NUL |
| Ok(PathBuf::from(OsString::from_vec(v))) |
| } |
| } |
| |
| #[cfg(target_os = "netbsd")] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| fn sysctl() -> io::Result<PathBuf> { |
| unsafe { |
| let mib = [libc::CTL_KERN, libc::KERN_PROC_ARGS, -1, libc::KERN_PROC_PATHNAME]; |
| let mut path_len: usize = 0; |
| cvt(libc::sysctl( |
| mib.as_ptr(), |
| mib.len() as libc::c_uint, |
| ptr::null_mut(), |
| &mut path_len, |
| ptr::null(), |
| 0, |
| ))?; |
| if path_len <= 1 { |
| return Err(io::const_io_error!( |
| io::ErrorKind::Uncategorized, |
| "KERN_PROC_PATHNAME sysctl returned zero-length string", |
| )); |
| } |
| let mut path: Vec<u8> = Vec::with_capacity(path_len); |
| cvt(libc::sysctl( |
| mib.as_ptr(), |
| mib.len() as libc::c_uint, |
| path.as_ptr() as *mut libc::c_void, |
| &mut path_len, |
| ptr::null(), |
| 0, |
| ))?; |
| path.set_len(path_len - 1); // chop off NUL |
| Ok(PathBuf::from(OsString::from_vec(path))) |
| } |
| } |
| fn procfs() -> io::Result<PathBuf> { |
| let curproc_exe = path::Path::new("/proc/curproc/exe"); |
| if curproc_exe.is_file() { |
| return crate::fs::read_link(curproc_exe); |
| } |
| Err(io::const_io_error!( |
| io::ErrorKind::Uncategorized, |
| "/proc/curproc/exe doesn't point to regular file.", |
| )) |
| } |
| sysctl().or_else(|_| procfs()) |
| } |
| |
| #[cfg(target_os = "openbsd")] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| unsafe { |
| let mut mib = [libc::CTL_KERN, libc::KERN_PROC_ARGS, libc::getpid(), libc::KERN_PROC_ARGV]; |
| let mib = mib.as_mut_ptr(); |
| let mut argv_len = 0; |
| cvt(libc::sysctl(mib, 4, ptr::null_mut(), &mut argv_len, ptr::null_mut(), 0))?; |
| let mut argv = Vec::<*const libc::c_char>::with_capacity(argv_len as usize); |
| cvt(libc::sysctl(mib, 4, argv.as_mut_ptr() as *mut _, &mut argv_len, ptr::null_mut(), 0))?; |
| argv.set_len(argv_len as usize); |
| if argv[0].is_null() { |
| return Err(io::const_io_error!( |
| io::ErrorKind::Uncategorized, |
| "no current exe available", |
| )); |
| } |
| let argv0 = CStr::from_ptr(argv[0]).to_bytes(); |
| if argv0[0] == b'.' || argv0.iter().any(|b| *b == b'/') { |
| crate::fs::canonicalize(OsStr::from_bytes(argv0)) |
| } else { |
| Ok(PathBuf::from(OsStr::from_bytes(argv0))) |
| } |
| } |
| } |
| |
| #[cfg(any(target_os = "linux", target_os = "android", target_os = "emscripten"))] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| let is_ld_so = |p: &crate::path::Path| -> Option<bool> { |
| let parent_dir_name = p.parent()?.file_name()?; |
| if parent_dir_name != OsStr::new("lib") { |
| return Some(false); |
| } |
| // We assume that the `ld.so` path is always valid unicode, since there's... no reason for |
| // it not to be. :) |
| let file_name = p.file_name()?.to_str()?; |
| Some( |
| file_name.starts_with("ld-linux-") |
| && (file_name.ends_with(".so") || file_name.contains(".so.")), |
| ) |
| }; |
| |
| match crate::fs::read_link("/proc/self/exe") { |
| Err(ref e) if e.kind() == io::ErrorKind::NotFound => Err(io::const_io_error!( |
| io::ErrorKind::Uncategorized, |
| "no /proc/self/exe available. Is /proc mounted?", |
| )), |
| Err(x) => Err(x), |
| Ok(p) => { |
| // Chrome OS-specific: in some configurations, Rust binaries are invoked through |
| // `ld.so`. In these cases, we want to present the user with the path to the Rust |
| // binary that was invoked. |
| // |
| // Because the ld.so wrappers _generally_ don't want to invoke things with absolute |
| // paths, this is _generally_ a path relative to dirname(ld.so). |
| if is_ld_so(&p) == Some(true) { |
| if let Some(relative_to_ld) = crate::env::var_os("LD_ARGV0_REL") { |
| let relative_to_ld = PathBuf::from(relative_to_ld); |
| if relative_to_ld.is_absolute() { |
| return Ok(relative_to_ld); |
| } |
| // safety: is_ld_so checks the parent directory of `p`. |
| return Ok(p.parent().unwrap().join(relative_to_ld)); |
| } |
| } |
| Ok(p) |
| } |
| } |
| } |
| |
| #[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| unsafe { |
| let mut sz: u32 = 0; |
| libc::_NSGetExecutablePath(ptr::null_mut(), &mut sz); |
| if sz == 0 { |
| return Err(io::Error::last_os_error()); |
| } |
| let mut v: Vec<u8> = Vec::with_capacity(sz as usize); |
| let err = libc::_NSGetExecutablePath(v.as_mut_ptr() as *mut i8, &mut sz); |
| if err != 0 { |
| return Err(io::Error::last_os_error()); |
| } |
| v.set_len(sz as usize - 1); // chop off trailing NUL |
| Ok(PathBuf::from(OsString::from_vec(v))) |
| } |
| } |
| |
| #[cfg(any(target_os = "solaris", target_os = "illumos"))] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| if let Ok(path) = crate::fs::read_link("/proc/self/path/a.out") { |
| Ok(path) |
| } else { |
| unsafe { |
| let path = libc::getexecname(); |
| if path.is_null() { |
| Err(io::Error::last_os_error()) |
| } else { |
| let filename = CStr::from_ptr(path).to_bytes(); |
| let path = PathBuf::from(<OsStr as OsStrExt>::from_bytes(filename)); |
| |
| // Prepend a current working directory to the path if |
| // it doesn't contain an absolute pathname. |
| if filename[0] == b'/' { Ok(path) } else { getcwd().map(|cwd| cwd.join(path)) } |
| } |
| } |
| } |
| } |
| |
| #[cfg(target_os = "haiku")] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| unsafe { |
| let mut info: mem::MaybeUninit<libc::image_info> = mem::MaybeUninit::uninit(); |
| let mut cookie: i32 = 0; |
| // the executable can be found at team id 0 |
| let result = libc::_get_next_image_info( |
| 0, |
| &mut cookie, |
| info.as_mut_ptr(), |
| mem::size_of::<libc::image_info>(), |
| ); |
| if result != 0 { |
| use crate::io::ErrorKind; |
| Err(io::const_io_error!(ErrorKind::Uncategorized, "Error getting executable path")) |
| } else { |
| let name = CStr::from_ptr((*info.as_ptr()).name.as_ptr()).to_bytes(); |
| Ok(PathBuf::from(OsStr::from_bytes(name))) |
| } |
| } |
| } |
| |
| #[cfg(target_os = "redox")] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| crate::fs::read_to_string("sys:exe").map(PathBuf::from) |
| } |
| |
| #[cfg(target_os = "l4re")] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| use crate::io::ErrorKind; |
| Err(io::const_io_error!(ErrorKind::Unsupported, "Not yet implemented!")) |
| } |
| |
| #[cfg(target_os = "vxworks")] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| #[cfg(test)] |
| use realstd::env; |
| |
| #[cfg(not(test))] |
| use crate::env; |
| |
| let exe_path = env::args().next().unwrap(); |
| let path = path::Path::new(&exe_path); |
| path.canonicalize() |
| } |
| |
| #[cfg(any(target_os = "espidf", target_os = "horizon"))] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| super::unsupported::unsupported() |
| } |
| |
| #[cfg(target_os = "fuchsia")] |
| pub fn current_exe() -> io::Result<PathBuf> { |
| use crate::io::ErrorKind; |
| |
| #[cfg(test)] |
| use realstd::env; |
| |
| #[cfg(not(test))] |
| use crate::env; |
| |
| let exe_path = env::args().next().ok_or(io::const_io_error!( |
| ErrorKind::Uncategorized, |
| "an executable path was not found because no arguments were provided through argv" |
| ))?; |
| let path = PathBuf::from(exe_path); |
| |
| // Prepend the current working directory to the path if it's not absolute. |
| if !path.is_absolute() { getcwd().map(|cwd| cwd.join(path)) } else { Ok(path) } |
| } |
| |
| pub struct Env { |
| iter: vec::IntoIter<(OsString, OsString)>, |
| } |
| |
| impl !Send for Env {} |
| impl !Sync for Env {} |
| |
| impl Iterator for Env { |
| type Item = (OsString, OsString); |
| fn next(&mut self) -> Option<(OsString, OsString)> { |
| self.iter.next() |
| } |
| fn size_hint(&self) -> (usize, Option<usize>) { |
| self.iter.size_hint() |
| } |
| } |
| |
| #[cfg(target_os = "macos")] |
| pub unsafe fn environ() -> *mut *const *const c_char { |
| libc::_NSGetEnviron() as *mut *const *const c_char |
| } |
| |
| #[cfg(not(target_os = "macos"))] |
| pub unsafe fn environ() -> *mut *const *const c_char { |
| extern "C" { |
| static mut environ: *const *const c_char; |
| } |
| ptr::addr_of_mut!(environ) |
| } |
| |
| static ENV_LOCK: RwLock<()> = RwLock::new(()); |
| |
| pub fn env_read_lock() -> impl Drop { |
| ENV_LOCK.read().unwrap_or_else(PoisonError::into_inner) |
| } |
| |
| /// Returns a vector of (variable, value) byte-vector pairs for all the |
| /// environment variables of the current process. |
| pub fn env() -> Env { |
| unsafe { |
| let _guard = env_read_lock(); |
| let mut environ = *environ(); |
| let mut result = Vec::new(); |
| if !environ.is_null() { |
| while !(*environ).is_null() { |
| if let Some(key_value) = parse(CStr::from_ptr(*environ).to_bytes()) { |
| result.push(key_value); |
| } |
| environ = environ.add(1); |
| } |
| } |
| return Env { iter: result.into_iter() }; |
| } |
| |
| fn parse(input: &[u8]) -> Option<(OsString, OsString)> { |
| // Strategy (copied from glibc): Variable name and value are separated |
| // by an ASCII equals sign '='. Since a variable name must not be |
| // empty, allow variable names starting with an equals sign. Skip all |
| // malformed lines. |
| if input.is_empty() { |
| return None; |
| } |
| let pos = memchr::memchr(b'=', &input[1..]).map(|p| p + 1); |
| pos.map(|p| { |
| ( |
| OsStringExt::from_vec(input[..p].to_vec()), |
| OsStringExt::from_vec(input[p + 1..].to_vec()), |
| ) |
| }) |
| } |
| } |
| |
| pub fn getenv(k: &OsStr) -> Option<OsString> { |
| // environment variables with a nul byte can't be set, so their value is |
| // always None as well |
| let s = run_with_cstr(k.as_bytes(), |k| { |
| let _guard = env_read_lock(); |
| Ok(unsafe { libc::getenv(k.as_ptr()) } as *const libc::c_char) |
| }) |
| .ok()?; |
| if s.is_null() { |
| None |
| } else { |
| Some(OsStringExt::from_vec(unsafe { CStr::from_ptr(s) }.to_bytes().to_vec())) |
| } |
| } |
| |
| pub fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> { |
| run_with_cstr(k.as_bytes(), |k| { |
| run_with_cstr(v.as_bytes(), |v| { |
| let _guard = ENV_LOCK.write(); |
| cvt(unsafe { libc::setenv(k.as_ptr(), v.as_ptr(), 1) }).map(drop) |
| }) |
| }) |
| } |
| |
| pub fn unsetenv(n: &OsStr) -> io::Result<()> { |
| run_with_cstr(n.as_bytes(), |nbuf| { |
| let _guard = ENV_LOCK.write(); |
| cvt(unsafe { libc::unsetenv(nbuf.as_ptr()) }).map(drop) |
| }) |
| } |
| |
| #[cfg(not(target_os = "espidf"))] |
| pub fn page_size() -> usize { |
| unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize } |
| } |
| |
| pub fn temp_dir() -> PathBuf { |
| crate::env::var_os("TMPDIR").map(PathBuf::from).unwrap_or_else(|| { |
| if cfg!(target_os = "android") { |
| PathBuf::from("/data/local/tmp") |
| } else { |
| PathBuf::from("/tmp") |
| } |
| }) |
| } |
| |
| pub fn home_dir() -> Option<PathBuf> { |
| return crate::env::var_os("HOME").or_else(|| unsafe { fallback() }).map(PathBuf::from); |
| |
| #[cfg(any( |
| target_os = "android", |
| target_os = "ios", |
| target_os = "watchos", |
| target_os = "emscripten", |
| target_os = "redox", |
| target_os = "vxworks", |
| target_os = "espidf", |
| target_os = "horizon" |
| ))] |
| unsafe fn fallback() -> Option<OsString> { |
| None |
| } |
| #[cfg(not(any( |
| target_os = "android", |
| target_os = "ios", |
| target_os = "watchos", |
| target_os = "emscripten", |
| target_os = "redox", |
| target_os = "vxworks", |
| target_os = "espidf", |
| target_os = "horizon" |
| )))] |
| unsafe fn fallback() -> Option<OsString> { |
| let amt = match libc::sysconf(libc::_SC_GETPW_R_SIZE_MAX) { |
| n if n < 0 => 512 as usize, |
| n => n as usize, |
| }; |
| let mut buf = Vec::with_capacity(amt); |
| let mut passwd: libc::passwd = mem::zeroed(); |
| let mut result = ptr::null_mut(); |
| match libc::getpwuid_r( |
| libc::getuid(), |
| &mut passwd, |
| buf.as_mut_ptr(), |
| buf.capacity(), |
| &mut result, |
| ) { |
| 0 if !result.is_null() => { |
| let ptr = passwd.pw_dir as *const _; |
| let bytes = CStr::from_ptr(ptr).to_bytes().to_vec(); |
| Some(OsStringExt::from_vec(bytes)) |
| } |
| _ => None, |
| } |
| } |
| } |
| |
| pub fn exit(code: i32) -> ! { |
| unsafe { libc::exit(code as c_int) } |
| } |
| |
| pub fn getpid() -> u32 { |
| unsafe { libc::getpid() as u32 } |
| } |
| |
| pub fn getppid() -> u32 { |
| unsafe { libc::getppid() as u32 } |
| } |
| |
| #[cfg(all(target_os = "linux", target_env = "gnu"))] |
| pub fn glibc_version() -> Option<(usize, usize)> { |
| extern "C" { |
| fn gnu_get_libc_version() -> *const libc::c_char; |
| } |
| let version_cstr = unsafe { CStr::from_ptr(gnu_get_libc_version()) }; |
| if let Ok(version_str) = version_cstr.to_str() { |
| parse_glibc_version(version_str) |
| } else { |
| None |
| } |
| } |
| |
| // Returns Some((major, minor)) if the string is a valid "x.y" version, |
| // ignoring any extra dot-separated parts. Otherwise return None. |
| #[cfg(all(target_os = "linux", target_env = "gnu"))] |
| fn parse_glibc_version(version: &str) -> Option<(usize, usize)> { |
| let mut parsed_ints = version.split('.').map(str::parse::<usize>).fuse(); |
| match (parsed_ints.next(), parsed_ints.next()) { |
| (Some(Ok(major)), Some(Ok(minor))) => Some((major, minor)), |
| _ => None, |
| } |
| } |
