124 lines
3.5 KiB
Rust
124 lines
3.5 KiB
Rust
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import str::sbuf;
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import vec::vbuf;
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export program;
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export run_program;
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export start_program;
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export program_output;
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export spawn_process;
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native "rust" mod rustrt {
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fn rust_run_program(argv: vbuf, in_fd: int, out_fd: int, err_fd: int) ->
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int;
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}
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fn arg_vec(prog: str, args: vec[str]) -> vec[sbuf] {
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let argptrs = [str::buf(prog)];
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for arg: str in args { vec::push[sbuf](argptrs, str::buf(arg)); }
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vec::push[sbuf](argptrs, 0 as sbuf);
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ret argptrs;
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}
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fn spawn_process(prog: str, args: vec[str], in_fd: int, out_fd: int,
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err_fd: int) -> int {
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// Note: we have to hold on to this vector reference while we hold a
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// pointer to its buffer
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let argv = arg_vec(prog, args);
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let pid = rustrt::rust_run_program(vec::buf(argv), in_fd, out_fd, err_fd);
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ret pid;
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}
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fn run_program(prog: str, args: vec[str]) -> int {
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ret os::waitpid(spawn_process(prog, args, 0, 0, 0));
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}
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type program =
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obj {
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fn get_id() -> int ;
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fn input() -> io::writer ;
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fn output() -> io::reader ;
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fn err() -> io::reader ;
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fn close_input() ;
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fn finish() -> int ;
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};
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fn start_program(prog: str, args: vec[str]) -> @program {
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let pipe_input = os::pipe();
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let pipe_output = os::pipe();
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let pipe_err = os::pipe();
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let pid = spawn_process(prog, args, pipe_input.in, pipe_output.out,
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pipe_err.out);
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if pid == -1 { fail; }
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os::libc::close(pipe_input.in);
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os::libc::close(pipe_output.out);
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os::libc::close(pipe_err.out);
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obj new_program(pid: int,
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mutable in_fd: int,
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out_file: os::libc::FILE,
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err_file: os::libc::FILE,
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mutable finished: bool) {
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fn get_id() -> int { ret pid; }
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fn input() -> io::writer {
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ret io::new_writer(io::fd_buf_writer(in_fd, false));
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}
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fn output() -> io::reader {
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ret io::new_reader(io::FILE_buf_reader(out_file, option::none));
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}
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fn err() -> io::reader {
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ret io::new_reader(io::FILE_buf_reader(err_file, option::none));
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}
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fn close_input() {
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let invalid_fd = -1;
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if in_fd != invalid_fd {
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os::libc::close(in_fd);
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in_fd = invalid_fd;
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}
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}
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fn finish() -> int {
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if finished { ret 0; }
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finished = true;
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self.close_input();
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ret os::waitpid(pid);
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}
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drop {
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self.close_input();
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if !finished { os::waitpid(pid); }
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os::libc::fclose(out_file);
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os::libc::fclose(err_file);
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}
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}
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ret @new_program(pid,
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pipe_input.out,
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os::fd_FILE(pipe_output.in),
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os::fd_FILE(pipe_err.in),
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false);
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}
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fn read_all(rd: &io::reader) -> str {
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let buf = "";
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while !rd.eof() {
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let bytes = rd.read_bytes(4096u);
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buf += str::unsafe_from_bytes(bytes);
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}
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ret buf;
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}
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fn program_output(prog: str, args: vec[str])
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-> {status: int, out: str, err: str} {
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let pr = start_program(prog, args);
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pr.close_input();
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ret {status: pr.finish(),
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out: read_all(pr.output()),
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err: read_all(pr.err())};
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}
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// Local Variables:
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// mode: rust
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// compile-command: "make -k -C $RBUILD 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
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// End:
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