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convert custom try macro to ? #60581

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merged 2 commits into from
May 22, 2019
Merged

convert custom try macro to ? #60581

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af6ace6
convert custom try macro to `?`
hellow554 May 6, 2019
5458b65
use exhaustive_patterns to be able to use `?`
hellow554 May 6, 2019
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65 changes: 30 additions & 35 deletions src/libstd/sys/redox/process.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -150,7 +150,7 @@ impl Command {
match cvt(syscall::clone(0))? {
0 => {
drop(input);
let err = self.do_exec(theirs);
let Err(err) = self.do_exec(theirs);
let errno = err.raw_os_error().unwrap_or(syscall::EINVAL) as u32;
let bytes = [
(errno >> 24) as u8,
Expand Down Expand Up @@ -218,7 +218,10 @@ impl Command {
}

match self.setup_io(default, true) {
Ok((_, theirs)) => unsafe { self.do_exec(theirs) },
Ok((_, theirs)) => unsafe {
let Err(e) = self.do_exec(theirs);
e
},
Err(e) => e,
}
}
Expand Down Expand Up @@ -253,45 +256,38 @@ impl Command {
// allocation). Instead we just close it manually. This will never
// have the drop glue anyway because this code never returns (the
// child will either exec() or invoke syscall::exit)
unsafe fn do_exec(&mut self, stdio: ChildPipes) -> io::Error {
macro_rules! t {
($e:expr) => (match $e {
Ok(e) => e,
Err(e) => return e,
})
}

unsafe fn do_exec(&mut self, stdio: ChildPipes) -> Result<!, io::Error> {
if let Some(fd) = stdio.stderr.fd() {
t!(cvt(syscall::dup2(fd, 2, &[])));
let mut flags = t!(cvt(syscall::fcntl(2, syscall::F_GETFD, 0)));
cvt(syscall::dup2(fd, 2, &[]))?;
let mut flags = cvt(syscall::fcntl(2, syscall::F_GETFD, 0))?;
flags &= ! syscall::O_CLOEXEC;
t!(cvt(syscall::fcntl(2, syscall::F_SETFD, flags)));
cvt(syscall::fcntl(2, syscall::F_SETFD, flags))?;
}
if let Some(fd) = stdio.stdout.fd() {
t!(cvt(syscall::dup2(fd, 1, &[])));
let mut flags = t!(cvt(syscall::fcntl(1, syscall::F_GETFD, 0)));
cvt(syscall::dup2(fd, 1, &[]))?;
let mut flags = cvt(syscall::fcntl(1, syscall::F_GETFD, 0))?;
flags &= ! syscall::O_CLOEXEC;
t!(cvt(syscall::fcntl(1, syscall::F_SETFD, flags)));
cvt(syscall::fcntl(1, syscall::F_SETFD, flags))?;
}
if let Some(fd) = stdio.stdin.fd() {
t!(cvt(syscall::dup2(fd, 0, &[])));
let mut flags = t!(cvt(syscall::fcntl(0, syscall::F_GETFD, 0)));
cvt(syscall::dup2(fd, 0, &[]))?;
let mut flags = cvt(syscall::fcntl(0, syscall::F_GETFD, 0))?;
flags &= ! syscall::O_CLOEXEC;
t!(cvt(syscall::fcntl(0, syscall::F_SETFD, flags)));
cvt(syscall::fcntl(0, syscall::F_SETFD, flags))?;
}

if let Some(g) = self.gid {
t!(cvt(syscall::setregid(g as usize, g as usize)));
cvt(syscall::setregid(g as usize, g as usize))?;
}
if let Some(u) = self.uid {
t!(cvt(syscall::setreuid(u as usize, u as usize)));
cvt(syscall::setreuid(u as usize, u as usize))?;
}
if let Some(ref cwd) = self.cwd {
t!(cvt(syscall::chdir(cwd)));
cvt(syscall::chdir(cwd))?;
}

for callback in self.closures.iter_mut() {
t!(callback());
callback()?;
}

self.env.apply();
Expand All @@ -313,9 +309,9 @@ impl Command {
};

let mut file = if let Some(program) = program {
t!(File::open(program.as_os_str()))
File::open(program.as_os_str())?
} else {
return io::Error::from_raw_os_error(syscall::ENOENT);
return Err(io::Error::from_raw_os_error(syscall::ENOENT));
};

// Push all the arguments
Expand All @@ -327,7 +323,7 @@ impl Command {
let mut shebang = [0; 2];
let mut read = 0;
loop {
match t!(reader.read(&mut shebang[read..])) {
match reader.read(&mut shebang[read..])? {
0 => break,
n => read += n,
}
Expand All @@ -338,9 +334,9 @@ impl Command {
// First of all, since we'll be passing another file to
// fexec(), we need to manually check that we have permission
// to execute this file:
let uid = t!(cvt(syscall::getuid()));
let gid = t!(cvt(syscall::getgid()));
let meta = t!(file.metadata());
let uid = cvt(syscall::getuid())?;
let gid = cvt(syscall::getgid())?;
let meta = file.metadata()?;

let mode = if uid == meta.uid() as usize {
meta.mode() >> 3*2 & 0o7
Expand All @@ -350,12 +346,12 @@ impl Command {
meta.mode() & 0o7
};
if mode & 1 == 0 {
return io::Error::from_raw_os_error(syscall::EPERM);
return Err(io::Error::from_raw_os_error(syscall::EPERM));
}

// Second of all, we need to actually read which interpreter it wants
let mut interpreter = Vec::new();
t!(reader.read_until(b'\n', &mut interpreter));
reader.read_until(b'\n', &mut interpreter)?;
// Pop one trailing newline, if any
if interpreter.ends_with(&[b'\n']) {
interpreter.pop().unwrap();
Expand All @@ -373,11 +369,11 @@ impl Command {
};
if let Some(ref interpreter) = interpreter {
let path: &OsStr = OsStr::from_bytes(&interpreter);
file = t!(File::open(path));
file = File::open(path)?;

args.push([interpreter.as_ptr() as usize, interpreter.len()]);
} else {
t!(file.seek(SeekFrom::Start(0)));
file.seek(SeekFrom::Start(0))?;
}

args.push([self.program.as_ptr() as usize, self.program.len()]);
Expand All @@ -396,13 +392,12 @@ impl Command {
}

if let Err(err) = syscall::fexec(file.as_raw_fd(), &args, &vars) {
io::Error::from_raw_os_error(err.errno as i32)
Err(io::Error::from_raw_os_error(err.errno as i32))
} else {
panic!("return from exec without err");
}
}


fn setup_io(&self, default: Stdio, needs_stdin: bool)
-> io::Result<(StdioPipes, ChildPipes)> {
let null = Stdio::Null;
Expand Down
38 changes: 16 additions & 22 deletions src/libstd/sys/unix/process/process_unix.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@ impl Command {
match result {
0 => {
drop(input);
let err = self.do_exec(theirs, envp.as_ref());
let Err(err) = self.do_exec(theirs, envp.as_ref());
let errno = err.raw_os_error().unwrap_or(libc::EINVAL) as u32;
let bytes = [
(errno >> 24) as u8,
Expand Down Expand Up @@ -123,7 +123,8 @@ impl Command {
// environment lock before we try to exec.
let _lock = sys::os::env_lock();

self.do_exec(theirs, envp.as_ref())
let Err(e) = self.do_exec(theirs, envp.as_ref());
e
}
}
Err(e) => e,
Expand Down Expand Up @@ -164,29 +165,22 @@ impl Command {
&mut self,
stdio: ChildPipes,
maybe_envp: Option<&CStringArray>
) -> io::Error {
) -> Result<!, io::Error> {
use crate::sys::{self, cvt_r};

macro_rules! t {
($e:expr) => (match $e {
Ok(e) => e,
Err(e) => return e,
})
}

if let Some(fd) = stdio.stdin.fd() {
t!(cvt_r(|| libc::dup2(fd, libc::STDIN_FILENO)));
cvt_r(|| libc::dup2(fd, libc::STDIN_FILENO))?;
}
if let Some(fd) = stdio.stdout.fd() {
t!(cvt_r(|| libc::dup2(fd, libc::STDOUT_FILENO)));
cvt_r(|| libc::dup2(fd, libc::STDOUT_FILENO))?;
}
if let Some(fd) = stdio.stderr.fd() {
t!(cvt_r(|| libc::dup2(fd, libc::STDERR_FILENO)));
cvt_r(|| libc::dup2(fd, libc::STDERR_FILENO))?;
}

if cfg!(not(any(target_os = "l4re"))) {
if let Some(u) = self.get_gid() {
t!(cvt(libc::setgid(u as gid_t)));
cvt(libc::setgid(u as gid_t))?;
}
if let Some(u) = self.get_uid() {
// When dropping privileges from root, the `setgroups` call
Expand All @@ -198,11 +192,11 @@ impl Command {
// privilege dropping function.
let _ = libc::setgroups(0, ptr::null());

t!(cvt(libc::setuid(u as uid_t)));
cvt(libc::setuid(u as uid_t))?;
}
}
if let Some(ref cwd) = *self.get_cwd() {
t!(cvt(libc::chdir(cwd.as_ptr())));
cvt(libc::chdir(cwd.as_ptr()))?;
}

// emscripten has no signal support.
Expand All @@ -225,18 +219,18 @@ impl Command {
0,
mem::size_of::<libc::sigset_t>());
} else {
t!(cvt(libc::sigemptyset(&mut set)));
cvt(libc::sigemptyset(&mut set))?;
}
t!(cvt(libc::pthread_sigmask(libc::SIG_SETMASK, &set,
ptr::null_mut())));
cvt(libc::pthread_sigmask(libc::SIG_SETMASK, &set,
ptr::null_mut()))?;
let ret = sys::signal(libc::SIGPIPE, libc::SIG_DFL);
if ret == libc::SIG_ERR {
return io::Error::last_os_error()
return Err(io::Error::last_os_error())
}
}

for callback in self.get_closures().iter_mut() {
t!(callback());
callback()?;
}

// Although we're performing an exec here we may also return with an
Expand All @@ -261,7 +255,7 @@ impl Command {
}

libc::execvp(self.get_argv()[0], self.get_argv().as_ptr());
io::Error::last_os_error()
Err(io::Error::last_os_error())
}

#[cfg(not(any(target_os = "macos", target_os = "freebsd",
Expand Down