Remove clone() and Daemon abstraction.

src/call.rs

@@ -38,11 +38,6 @@ pub fn chmod<T: AsRef<str>>(path: T, mode: usize) -> Result<usize> {
     unsafe { syscall3(SYS_CHMOD, path.as_ref().as_ptr() as usize, path.as_ref().len(), mode) }
 }
 
-/// Produce a fork of the current process, or a new process thread
-pub unsafe fn clone(flags: CloneFlags) -> Result<usize> {
-    syscall1(SYS_CLONE, flags.bits())
-}
-
 /// Close a file
 pub fn close(fd: usize) -> Result<usize> {
     unsafe { syscall1(SYS_CLOSE, fd) }

src/daemon.rs

@@ -1,62 +0,0 @@
-use core::convert::Infallible;
-
-use super::{
-    clone,
-    CloneFlags,
-    close,
-    EIO,
-    Error,
-    exit,
-    pipe2,
-    read,
-    Result,
-    write,
-};
-
-#[must_use = "Daemon::ready must be called"]
-pub struct Daemon {
-    write_pipe: usize,
-}
-
-impl Daemon {
-    pub fn new<F: FnOnce(Daemon) -> Infallible>(f: F) -> Result<Infallible> {
-        let mut pipes = [0; 2];
-        pipe2(&mut pipes, 0)?;
-
-        let [read_pipe, write_pipe] = pipes;
-
-        if unsafe { clone(CloneFlags::empty())? } == 0 {
-            let _ = close(read_pipe);
-
-            f(Daemon {
-                write_pipe,
-            });
-            // TODO: Replace Infallible with the never type once it is stabilized.
-            unreachable!();
-        } else {
-            let _ = close(write_pipe);
-
-            let mut data = [0];
-            let res = read(read_pipe, &mut data);
-            let _ = close(read_pipe);
-
-            if res? == 1 {
-                exit(data[0] as usize)?;
-                unreachable!();
-            } else {
-                Err(Error::new(EIO))
-            }
-        }
-    }
-
-    pub fn ready(self) -> Result<()> {
-        let res = write(self.write_pipe, &[0]);
-        let _ = close(self.write_pipe);
-
-        if res? == 1 {
-            Ok(())
-        } else {
-            Err(Error::new(EIO))
-        }
-    }
-}

src/lib.rs

@@ -5,7 +5,6 @@ extern crate core;
 
 pub use self::arch::*;
 pub use self::call::*;
-pub use self::daemon::*;
 pub use self::data::*;
 pub use self::error::*;
 pub use self::flag::*;
@@ -43,9 +42,6 @@ pub mod call;
 /// Complex structures that are used for some system calls
 pub mod data;
 
-/// Wrapper to make daemons easier to write
-pub mod daemon;
-
 /// All errors that can be generated by a system call
 pub mod error;
 

src/number.rs

@@ -41,7 +41,6 @@ pub const SYS_FUTIMENS: usize =   SYS_CLASS_FILE | SYS_ARG_SLICE | 320;
 pub const SYS_EXEC: usize =     101;
 pub const SYS_CHDIR: usize =    12;
 pub const SYS_CLOCK_GETTIME: usize = 265;
-pub const SYS_CLONE: usize =    120;
 pub const SYS_EXIT: usize =     1;
 pub const SYS_FUTEX: usize =    240;
 pub const SYS_GETCWD: usize =   183;