library/std/src/sys/hermit/os.rs

   1 use crate::collections::HashMap;
   2 use crate::error::Error as StdError;
   3 use crate::ffi::{CStr, OsStr, OsString};
   4 use crate::fmt;
   5 use crate::io;
   6 use crate::marker::PhantomData;
   7 use crate::memchr;
   8 use crate::path::{self, PathBuf};
   9 use crate::str;
  10 use crate::sync::Mutex;
  11 use crate::sys::hermit::abi;
  12 use crate::sys::unsupported;
  13 use crate::sys_common::os_str_bytes::*;
  14 use crate::vec;
  15
  16 pub fn errno() -> i32 {
  17     0
  18 }
  19
  20 pub fn error_string(_errno: i32) -> String {
  21     "operation successful".to_string()
  22 }
  23
  24 pub fn getcwd() -> io::Result<PathBuf> {
  25     unsupported()
  26 }
  27
  28 pub fn chdir(_: &path::Path) -> io::Result<()> {
  29     unsupported()
  30 }
  31
  32 pub struct SplitPaths<'a>(!, PhantomData<&'a ()>);
  33
  34 pub fn split_paths(_unparsed: &OsStr) -> SplitPaths<'_> {
  35     panic!("unsupported")
  36 }
  37
  38 impl<'a> Iterator for SplitPaths<'a> {
  39     type Item = PathBuf;
  40     fn next(&mut self) -> Option<PathBuf> {
  41         self.0
  42     }
  43 }
  44
  45 #[derive(Debug)]
  46 pub struct JoinPathsError;
  47
  48 pub fn join_paths<I, T>(_paths: I) -> Result<OsString, JoinPathsError>
  49 where
  50     I: Iterator<Item = T>,
  51     T: AsRef<OsStr>,
  52 {
  53     Err(JoinPathsError)
  54 }
  55
  56 impl fmt::Display for JoinPathsError {
  57     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
  58         "not supported on hermit yet".fmt(f)
  59     }
  60 }
  61
  62 impl StdError for JoinPathsError {
  63     #[allow(deprecated)]
  64     fn description(&self) -> &str {
  65         "not supported on hermit yet"
  66     }
  67 }
  68
  69 pub fn current_exe() -> io::Result<PathBuf> {
  70     unsupported()
  71 }
  72
  73 static mut ENV: Option<Mutex<HashMap<OsString, OsString>>> = None;
  74
  75 pub fn init_environment(env: *const *const i8) {
  76     unsafe {
  77         ENV = Some(Mutex::new(HashMap::new()));
  78
  79         if env.is_null() {
  80             return;
  81         }
  82
  83         let mut guard = ENV.as_ref().unwrap().lock().unwrap();
  84         let mut environ = env;
  85         while !(*environ).is_null() {
  86             if let Some((key, value)) = parse(CStr::from_ptr(*environ).to_bytes()) {
  87                 guard.insert(key, value);
  88             }
  89             environ = environ.add(1);
  90         }
  91     }
  92
  93     fn parse(input: &[u8]) -> Option<(OsString, OsString)> {
  94         // Strategy (copied from glibc): Variable name and value are separated
  95         // by an ASCII equals sign '='. Since a variable name must not be
  96         // empty, allow variable names starting with an equals sign. Skip all
  97         // malformed lines.
  98         if input.is_empty() {
  99             return None;
 100         }
 101         let pos = memchr::memchr(b'=', &input[1..]).map(|p| p + 1);
 102         pos.map(|p| {
 103             (
 104                 OsStringExt::from_vec(input[..p].to_vec()),
 105                 OsStringExt::from_vec(input[p + 1..].to_vec()),
 106             )
 107         })
 108     }
 109 }
 110
 111 pub struct Env {
 112     iter: vec::IntoIter<(OsString, OsString)>,
 113 }
 114
 115 impl !Send for Env {}
 116 impl !Sync for Env {}
 117
 118 impl Iterator for Env {
 119     type Item = (OsString, OsString);
 120     fn next(&mut self) -> Option<(OsString, OsString)> {
 121         self.iter.next()
 122     }
 123     fn size_hint(&self) -> (usize, Option<usize>) {
 124         self.iter.size_hint()
 125     }
 126 }
 127
 128 /// Returns a vector of (variable, value) byte-vector pairs for all the
 129 /// environment variables of the current process.
 130 pub fn env() -> Env {
 131     unsafe {
 132         let guard = ENV.as_ref().unwrap().lock().unwrap();
 133         let mut result = Vec::new();
 134
 135         for (key, value) in guard.iter() {
 136             result.push((key.clone(), value.clone()));
 137         }
 138
 139         return Env { iter: result.into_iter() };
 140     }
 141 }
 142
 143 pub fn getenv(k: &OsStr) -> io::Result<Option<OsString>> {
 144     unsafe {
 145         match ENV.as_ref().unwrap().lock().unwrap().get_mut(k) {
 146             Some(value) => Ok(Some(value.clone())),
 147             None => Ok(None),
 148         }
 149     }
 150 }
 151
 152 pub fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> {
 153     unsafe {
 154         let (k, v) = (k.to_owned(), v.to_owned());
 155         ENV.as_ref().unwrap().lock().unwrap().insert(k, v);
 156     }
 157     Ok(())
 158 }
 159
 160 pub fn unsetenv(k: &OsStr) -> io::Result<()> {
 161     unsafe {
 162         ENV.as_ref().unwrap().lock().unwrap().remove(k);
 163     }
 164     Ok(())
 165 }
 166
 167 pub fn temp_dir() -> PathBuf {
 168     panic!("no filesystem on hermit")
 169 }
 170
 171 pub fn home_dir() -> Option<PathBuf> {
 172     None
 173 }
 174
 175 pub fn exit(code: i32) -> ! {
 176     unsafe {
 177         abi::exit(code);
 178     }
 179 }
 180
 181 pub fn getpid() -> u32 {
 182     unsafe { abi::getpid() }
 183 }