auto merge of #12380 : alexcrichton/rust/run-rewrite, r=brson

The std::run module is a relic from a standard library long since past, and
there's not much use to having two modules to execute processes with where one
is slightly more convenient. This commit merges the two modules, moving lots of
functionality from std::run into std::io::process and then deleting
std::run.

New things you can find in std::io::process are:

* Process::new() now only takes prog/args
* Process::configure() takes a ProcessConfig
* Process::status() is the same as run::process_status
* Process::output() is the same as run::process_output
* I/O for spawned tasks is now defaulted to captured in pipes instead of ignored
* Process::kill() was added (plus an associated green/native implementation)
* Process::wait_with_output() is the same as the old finish_with_output()
* destroy() is now signal_exit()
* force_destroy() is now signal_kill()

Closes #2625
Closes #10016

src/compiletest/procsrv.rs

@@ -9,9 +9,8 @@
 // except according to those terms.
 
 use std::os;
-use std::run;
 use std::str;
-use std::io::process::ProcessExit;
+use std::io::process::{ProcessExit, Process, ProcessConfig, ProcessOutput};
 
 #[cfg(target_os = "win32")]
 fn target_env(lib_path: &str, prog: &str) -> ~[(~str,~str)] {
@@ -49,17 +48,19 @@ pub fn run(lib_path: &str,
            input: Option<~str>) -> Option<Result> {
 
     let env = env + target_env(lib_path, prog);
-    let mut opt_process = run::Process::new(prog, args, run::ProcessOptions {
-        env: Some(env),
-        .. run::ProcessOptions::new()
+    let mut opt_process = Process::configure(ProcessConfig {
+        program: prog,
+        args: args,
+        env: Some(env.as_slice()),
+        .. ProcessConfig::new()
     });
 
     match opt_process {
         Ok(ref mut process) => {
             for input in input.iter() {
-                process.input().write(input.as_bytes()).unwrap();
+                process.stdin.get_mut_ref().write(input.as_bytes()).unwrap();
             }
-            let run::ProcessOutput { status, output, error } = process.finish_with_output();
+            let ProcessOutput { status, output, error } = process.wait_with_output();
 
             Some(Result {
                 status: status,
@@ -75,18 +76,20 @@ pub fn run_background(lib_path: &str,
            prog: &str,
            args: &[~str],
            env: ~[(~str, ~str)],
-           input: Option<~str>) -> Option<run::Process> {
+           input: Option<~str>) -> Option<Process> {
 
     let env = env + target_env(lib_path, prog);
-    let opt_process = run::Process::new(prog, args, run::ProcessOptions {
-        env: Some(env),
-        .. run::ProcessOptions::new()
+    let opt_process = Process::configure(ProcessConfig {
+        program: prog,
+        args: args,
+        env: Some(env.as_slice()),
+        .. ProcessConfig::new()
     });
 
     match opt_process {
         Ok(mut process) => {
             for input in input.iter() {
-                process.input().write(input.as_bytes()).unwrap();
+                process.stdin.get_mut_ref().write(input.as_bytes()).unwrap();
             }
 
             Some(process)

src/compiletest/runtest.rs

@@ -360,7 +360,7 @@ fn run_debuginfo_test(config: &config, props: &TestProps, testfile: &Path) {
                                stdout: out,
                                stderr: err,
                                cmdline: cmdline};
-            process.force_destroy().unwrap();
+            process.signal_kill().unwrap();
         }
 
         _=> {

src/libextra/workcache.rs

@@ -464,8 +464,8 @@ impl<'a, T:Send +
 #[test]
 #[cfg(not(target_os="android"))] // FIXME(#10455)
 fn test() {
-    use std::{os, run};
-    use std::io::fs;
+    use std::os;
+    use std::io::{fs, Process};
     use std::str::from_utf8_owned;
 
     // Create a path to a new file 'filename' in the directory in which
@@ -499,9 +499,9 @@ fn test() {
         prep.exec(proc(_exe) {
             let out = make_path(~"foo.o");
             // FIXME (#9639): This needs to handle non-utf8 paths
-            run::process_status("gcc", [pth.as_str().unwrap().to_owned(),
-                                        ~"-o",
-                                        out.as_str().unwrap().to_owned()]).unwrap();
+            Process::status("gcc", [pth.as_str().unwrap().to_owned(),
+                                    ~"-o",
+                                    out.as_str().unwrap().to_owned()]).unwrap();
 
             let _proof_of_concept = subcx.prep("subfn");
             // Could run sub-rules inside here.

src/libnative/io/mod.rs

@@ -287,6 +287,9 @@ impl rtio::IoFactory for IoFactory {
              io.move_iter().map(|p| p.map(|p| ~p as ~RtioPipe)).collect())
         })
     }
+    fn kill(&mut self, pid: libc::pid_t, signum: int) -> IoResult<()> {
+        process::Process::kill(pid, signum)
+    }
     fn pipe_open(&mut self, fd: c_int) -> IoResult<~RtioPipe> {
         Ok(~file::FileDesc::new(fd, true) as ~RtioPipe)
     }

src/libnative/io/process.rs

@@ -66,35 +66,33 @@ impl Process {
         -> Result<(Process, ~[Option<file::FileDesc>]), io::IoError>
     {
         // right now we only handle stdin/stdout/stderr.
-        if config.io.len() > 3 {
+        if config.extra_io.len() > 0 {
             return Err(super::unimpl());
         }
 
-        fn get_io(io: &[p::StdioContainer],
-                  ret: &mut ~[Option<file::FileDesc>],
-                  idx: uint) -> (Option<os::Pipe>, c_int) {
-            if idx >= io.len() { return (None, -1); }
-            ret.push(None);
-            match io[idx] {
-                p::Ignored => (None, -1),
-                p::InheritFd(fd) => (None, fd),
+        fn get_io(io: p::StdioContainer, ret: &mut ~[Option<file::FileDesc>])
+            -> (Option<os::Pipe>, c_int)
+        {
+            match io {
+                p::Ignored => { ret.push(None); (None, -1) }
+                p::InheritFd(fd) => { ret.push(None); (None, fd) }
                 p::CreatePipe(readable, _writable) => {
                     let pipe = os::pipe();
                     let (theirs, ours) = if readable {
                         (pipe.input, pipe.out)
                     } else {
                         (pipe.out, pipe.input)
                     };
-                    ret[idx] = Some(file::FileDesc::new(ours, true));
+                    ret.push(Some(file::FileDesc::new(ours, true)));
                     (Some(pipe), theirs)
                 }
             }
         }
 
         let mut ret_io = ~[];
-        let (in_pipe, in_fd) = get_io(config.io, &mut ret_io, 0);
-        let (out_pipe, out_fd) = get_io(config.io, &mut ret_io, 1);
-        let (err_pipe, err_fd) = get_io(config.io, &mut ret_io, 2);
+        let (in_pipe, in_fd) = get_io(config.stdin, &mut ret_io);
+        let (out_pipe, out_fd) = get_io(config.stdout, &mut ret_io);
+        let (err_pipe, err_fd) = get_io(config.stderr, &mut ret_io);
 
         let env = config.env.map(|a| a.to_owned());
         let cwd = config.cwd.map(|a| Path::new(a));
@@ -115,6 +113,10 @@ impl Process {
             Err(e) => Err(e)
         }
     }
+
+    pub fn kill(pid: libc::pid_t, signum: int) -> IoResult<()> {
+        unsafe { killpid(pid, signum) }
+    }
 }
 
 impl rtio::RtioProcess for Process {
@@ -144,34 +146,58 @@ impl rtio::RtioProcess for Process {
             None => {}
         }
         return unsafe { killpid(self.pid, signum) };
+    }
+}
 
-        #[cfg(windows)]
-        unsafe fn killpid(pid: pid_t, signal: int) -> Result<(), io::IoError> {
-            match signal {
-                io::process::PleaseExitSignal | io::process::MustDieSignal => {
-                    let ret = libc::TerminateProcess(pid as libc::HANDLE, 1);
-                    super::mkerr_winbool(ret)
-                }
-                _ => Err(io::IoError {
+impl Drop for Process {
+    fn drop(&mut self) {
+        free_handle(self.handle);
+    }
+}
+
+#[cfg(windows)]
+unsafe fn killpid(pid: pid_t, signal: int) -> Result<(), io::IoError> {
+    let handle = libc::OpenProcess(libc::PROCESS_TERMINATE |
+                                   libc::PROCESS_QUERY_INFORMATION,
+                                   libc::FALSE, pid as libc::DWORD);
+    if handle.is_null() {
+        return Err(super::last_error())
+    }
+    let ret = match signal {
+        // test for existence on signal 0
+        0 => {
+            let mut status = 0;
+            let ret = libc::GetExitCodeProcess(handle, &mut status);
+            if ret == 0 {
+                Err(super::last_error())
+            } else if status != libc::STILL_ACTIVE {
+                Err(io::IoError {
                     kind: io::OtherIoError,
-                    desc: "unsupported signal on windows",
+                    desc: "process no longer alive",
                     detail: None,
                 })
+            } else {
+                Ok(())
             }
         }
-
-        #[cfg(not(windows))]
-        unsafe fn killpid(pid: pid_t, signal: int) -> Result<(), io::IoError> {
-            let r = libc::funcs::posix88::signal::kill(pid, signal as c_int);
-            super::mkerr_libc(r)
+        io::process::PleaseExitSignal | io::process::MustDieSignal => {
+            let ret = libc::TerminateProcess(handle, 1);
+            super::mkerr_winbool(ret)
         }
-    }
+        _ => Err(io::IoError {
+            kind: io::OtherIoError,
+            desc: "unsupported signal on windows",
+            detail: None,
+        })
+    };
+    let _ = libc::CloseHandle(handle);
+    return ret;
 }
 
-impl Drop for Process {
-    fn drop(&mut self) {
-        free_handle(self.handle);
-    }
+#[cfg(not(windows))]
+unsafe fn killpid(pid: pid_t, signal: int) -> Result<(), io::IoError> {
+    let r = libc::funcs::posix88::signal::kill(pid, signal as c_int);
+    super::mkerr_libc(r)
 }
 
 struct SpawnProcessResult {
@@ -536,10 +562,10 @@ fn spawn_process_os(config: p::ProcessConfig,
             if !envp.is_null() {
                 set_environ(envp);
             }
-        });
-        with_argv(config.program, config.args, |argv| {
-            let _ = execvp(*argv, argv);
-            fail(&mut output);
+            with_argv(config.program, config.args, |argv| {
+                let _ = execvp(*argv, argv);
+                fail(&mut output);
+            })
         })
     }
 }

src/librustc/back/archive.rs

@@ -20,7 +20,7 @@ use std::io::fs;
 use std::io;
 use std::libc;
 use std::os;
-use std::run::{ProcessOptions, Process, ProcessOutput};
+use std::io::process::{ProcessConfig, Process, ProcessOutput};
 use std::str;
 use std::raw;
 use extra::tempfile::TempDir;
@@ -44,16 +44,19 @@ fn run_ar(sess: Session, args: &str, cwd: Option<&Path>,
     let mut args = ~[args.to_owned()];
     let mut paths = paths.iter().map(|p| p.as_str().unwrap().to_owned());
     args.extend(&mut paths);
-    let mut opts = ProcessOptions::new();
-    opts.dir = cwd;
     debug!("{} {}", ar, args.connect(" "));
     match cwd {
         Some(p) => { debug!("inside {}", p.display()); }
         None => {}
     }
-    match Process::new(ar, args.as_slice(), opts) {
+    match Process::configure(ProcessConfig {
+        program: ar.as_slice(),
+        args: args.as_slice(),
+        cwd: cwd.map(|a| &*a),
+        .. ProcessConfig::new()
+    }) {
         Ok(mut prog) => {
-            let o = prog.finish_with_output();
+            let o = prog.wait_with_output();
             if !o.status.success() {
                 sess.err(format!("{} {} failed with: {}", ar, args.connect(" "),
                                  o.status));

src/librustc/back/link.rs

@@ -30,9 +30,9 @@ use std::c_str::ToCStr;
 use std::char;
 use std::os::consts::{macos, freebsd, linux, android, win32};
 use std::ptr;
-use std::run;
 use std::str;
 use std::io;
+use std::io::Process;
 use std::io::fs;
 use flate;
 use serialize::hex::ToHex;
@@ -101,8 +101,8 @@ pub mod write {
     use syntax::abi;
 
     use std::c_str::ToCStr;
+    use std::io::Process;
     use std::libc::{c_uint, c_int};
-    use std::run;
     use std::str;
 
     // On android, we by default compile for armv7 processors. This enables
@@ -333,7 +333,7 @@ pub mod write {
             assembly.as_str().unwrap().to_owned()];
 
         debug!("{} '{}'", cc, args.connect("' '"));
-        match run::process_output(cc, args) {
+        match Process::output(cc, args) {
             Ok(prog) => {
                 if !prog.status.success() {
                     sess.err(format!("linking with `{}` failed: {}", cc, prog.status));
@@ -1033,7 +1033,7 @@ fn link_natively(sess: Session, dylib: bool, obj_filename: &Path,
     // Invoke the system linker
     debug!("{} {}", cc_prog, cc_args.connect(" "));
     let prog = time(sess.time_passes(), "running linker", (), |()|
-                    run::process_output(cc_prog, cc_args));
+                    Process::output(cc_prog, cc_args));
     match prog {
         Ok(prog) => {
             if !prog.status.success() {
@@ -1054,7 +1054,7 @@ fn link_natively(sess: Session, dylib: bool, obj_filename: &Path,
     // the symbols
     if sess.targ_cfg.os == abi::OsMacos && sess.opts.debuginfo {
         // FIXME (#9639): This needs to handle non-utf8 paths
-        match run::process_status("dsymutil",
+        match Process::status("dsymutil",
                                   [out_filename.as_str().unwrap().to_owned()]) {
             Ok(..) => {}
             Err(e) => {

src/librustdoc/test.rs

@@ -9,12 +9,12 @@
 // except according to those terms.
 
 use std::cell::RefCell;
-use collections::HashSet;
+use std::io::Process;
 use std::local_data;
 use std::os;
-use std::run;
 use std::str;
 
+use collections::HashSet;
 use testing;
 use extra::tempfile::TempDir;
 use rustc::back::link;
@@ -126,7 +126,7 @@ fn runtest(test: &str, cratename: &str, libs: HashSet<Path>, should_fail: bool)
     driver::compile_input(sess, cfg, &input, &out, &None);
 
     let exe = outdir.path().join("rust_out");
-    let out = run::process_output(exe.as_str().unwrap(), []);
+    let out = Process::output(exe.as_str().unwrap(), []);
     match out {
         Err(e) => fail!("couldn't run the test: {}", e),
         Ok(out) => {

src/librustuv/process.rs

@@ -44,7 +44,10 @@ impl Process {
                 -> Result<(~Process, ~[Option<PipeWatcher>]), UvError>
     {
         let cwd = config.cwd.map(|s| s.to_c_str());
-        let io = config.io;
+        let mut io = ~[config.stdin, config.stdout, config.stderr];
+        for slot in config.extra_io.iter() {
+            io.push(*slot);
+        }
         let mut stdio = vec::with_capacity::<uvll::uv_stdio_container_t>(io.len());
         let mut ret_io = vec::with_capacity(io.len());
         unsafe {
@@ -105,6 +108,15 @@ impl Process {
             Err(e) => Err(e),
         }
     }
+
+    pub fn kill(pid: libc::pid_t, signum: int) -> Result<(), UvError> {
+        match unsafe {
+            uvll::uv_kill(pid as libc::c_int, signum as libc::c_int)
+        } {
+            0 => Ok(()),
+            n => Err(UvError(n))
+        }
+    }
 }
 
 extern fn on_exit(handle: *uvll::uv_process_t,

src/librustuv/uvio.rs

@@ -277,6 +277,10 @@ impl IoFactory for UvIoFactory {
         }
     }
 
+    fn kill(&mut self, pid: libc::pid_t, signum: int) -> Result<(), IoError> {
+        Process::kill(pid, signum).map_err(uv_error_to_io_error)
+    }
+
     fn unix_bind(&mut self, path: &CString) -> Result<~rtio::RtioUnixListener, IoError>
     {
         match PipeListener::bind(self, path) {