271 lines
9.0 KiB
Zig
271 lines
9.0 KiB
Zig
const io = @import("../io.zig");
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const os = @import("index.zig");
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const posix = os.posix;
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const mem = @import("../mem.zig");
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const Allocator = mem.Allocator;
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const errno = @import("errno.zig");
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const debug = @import("../debug.zig");
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const assert = debug.assert;
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const BufMap = @import("../buf_map.zig").BufMap;
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pub const ChildProcess = struct {
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pid: i32,
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err_pipe: [2]i32,
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stdin: ?io.OutStream,
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stdout: ?io.InStream,
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stderr: ?io.InStream,
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pub const Term = enum {
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Clean: i32,
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Signal: i32,
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Stopped: i32,
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Unknown: i32,
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};
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pub const StdIo = enum {
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Inherit,
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Ignore,
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Pipe,
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Close,
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};
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pub fn spawn(exe_path: []const u8, args: []const []const u8, env_map: &const BufMap,
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stdin: StdIo, stdout: StdIo, stderr: StdIo, allocator: &Allocator) -> %ChildProcess
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{
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switch (@compileVar("os")) {
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Os.linux, Os.macosx, Os.ios, Os.darwin => {
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return spawnPosix(exe_path, args, env_map, stdin, stdout, stderr, allocator);
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},
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else => @compileError("Unsupported OS"),
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}
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}
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pub fn wait(self: &ChildProcess) -> %Term {
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defer {
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os.posixClose(self.err_pipe[0]);
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os.posixClose(self.err_pipe[1]);
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};
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var status: i32 = undefined;
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while (true) {
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const err = posix.getErrno(posix.waitpid(self.pid, &status, 0));
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if (err > 0) {
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switch (err) {
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errno.EINVAL, errno.ECHILD => unreachable,
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errno.EINTR => continue,
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else => {
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if (const *stdin ?= self.stdin) { stdin.close(); }
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if (const *stdout ?= self.stdin) { stdout.close(); }
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if (const *stderr ?= self.stdin) { stderr.close(); }
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return error.Unexpected;
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},
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}
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}
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break;
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}
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if (const *stdin ?= self.stdin) { stdin.close(); }
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if (const *stdout ?= self.stdin) { stdout.close(); }
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if (const *stderr ?= self.stdin) { stderr.close(); }
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// Write @maxValue(ErrInt) to the write end of the err_pipe. This is after
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// waitpid, so this write is guaranteed to be after the child
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// pid potentially wrote an error. This way we can do a blocking
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// read on the error pipe and either get @maxValue(ErrInt) (no error) or
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// an error code.
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%return writeIntFd(self.err_pipe[1], @maxValue(ErrInt));
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const err_int = %return readIntFd(self.err_pipe[0]);
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// Here we potentially return the fork child's error
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// from the parent pid.
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if (err_int != @maxValue(ErrInt)) {
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return error(err_int);
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}
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return statusToTerm(status);
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}
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fn statusToTerm(status: i32) -> Term {
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return if (posix.WIFEXITED(status)) {
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Term.Clean { posix.WEXITSTATUS(status) }
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} else if (posix.WIFSIGNALED(status)) {
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Term.Signal { posix.WTERMSIG(status) }
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} else if (posix.WIFSTOPPED(status)) {
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Term.Stopped { posix.WSTOPSIG(status) }
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} else {
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Term.Unknown { status }
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};
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}
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fn spawnPosix(exe_path: []const u8, args: []const []const u8, env_map: &const BufMap,
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stdin: StdIo, stdout: StdIo, stderr: StdIo, allocator: &Allocator) -> %ChildProcess
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{
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// TODO issue #295
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//const stdin_pipe = if (stdin == StdIo.Pipe) %return makePipe() else undefined;
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var stdin_pipe: [2]i32 = undefined;
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if (stdin == StdIo.Pipe)
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stdin_pipe = %return makePipe();
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%defer if (stdin == StdIo.Pipe) { destroyPipe(stdin_pipe); };
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// TODO issue #295
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//const stdout_pipe = if (stdout == StdIo.Pipe) %return makePipe() else undefined;
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var stdout_pipe: [2]i32 = undefined;
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if (stdout == StdIo.Pipe)
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stdout_pipe = %return makePipe();
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%defer if (stdout == StdIo.Pipe) { destroyPipe(stdout_pipe); };
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// TODO issue #295
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//const stderr_pipe = if (stderr == StdIo.Pipe) %return makePipe() else undefined;
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var stderr_pipe: [2]i32 = undefined;
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if (stderr == StdIo.Pipe)
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stderr_pipe = %return makePipe();
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%defer if (stderr == StdIo.Pipe) { destroyPipe(stderr_pipe); };
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const any_ignore = (stdin == StdIo.Ignore or stdout == StdIo.Ignore or stderr == StdIo.Ignore);
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// TODO issue #295
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//const dev_null_fd = if (any_ignore) {
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// %return os.posixOpen("/dev/null", posix.O_RDWR, 0, null)
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//} else {
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// undefined
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//};
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var dev_null_fd: i32 = undefined;
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if (any_ignore)
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dev_null_fd = %return os.posixOpen("/dev/null", posix.O_RDWR, 0, null);
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// This pipe is used to communicate errors between the time of fork
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// and execve from the child process to the parent process.
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const err_pipe = %return makePipe();
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%defer destroyPipe(err_pipe);
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const pid = posix.fork();
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const pid_err = posix.getErrno(pid);
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if (pid_err > 0) {
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return switch (pid_err) {
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errno.EAGAIN, errno.ENOMEM, errno.ENOSYS => error.SysResources,
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else => error.Unexpected,
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};
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}
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if (pid == 0) {
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// we are the child
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setUpChildIo(stdin, stdin_pipe[0], posix.STDIN_FILENO, dev_null_fd) %%
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|err| forkChildErrReport(err_pipe[1], err);
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setUpChildIo(stdout, stdout_pipe[1], posix.STDOUT_FILENO, dev_null_fd) %%
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|err| forkChildErrReport(err_pipe[1], err);
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setUpChildIo(stderr, stderr_pipe[1], posix.STDERR_FILENO, dev_null_fd) %%
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|err| forkChildErrReport(err_pipe[1], err);
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os.posixExecve(exe_path, args, env_map, allocator) %%
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|err| forkChildErrReport(err_pipe[1], err);
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}
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// we are the parent
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if (stdin == StdIo.Pipe) { os.posixClose(stdin_pipe[0]); }
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if (stdout == StdIo.Pipe) { os.posixClose(stdout_pipe[1]); }
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if (stderr == StdIo.Pipe) { os.posixClose(stderr_pipe[1]); }
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if (any_ignore) { os.posixClose(dev_null_fd); }
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return ChildProcess {
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.pid = i32(pid),
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.err_pipe = err_pipe,
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.stdin = if (stdin == StdIo.Pipe) {
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io.OutStream {
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.fd = stdin_pipe[1],
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.buffer = undefined,
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.index = 0,
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}
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} else {
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null
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},
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.stdout = if (stdout == StdIo.Pipe) {
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io.InStream {
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.fd = stdout_pipe[0],
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}
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} else {
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null
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},
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.stderr = if (stderr == StdIo.Pipe) {
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io.InStream {
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.fd = stderr_pipe[0],
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}
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} else {
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null
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},
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};
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}
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fn setUpChildIo(stdio: StdIo, pipe_fd: i32, std_fileno: i32, dev_null_fd: i32) -> %void {
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switch (stdio) {
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StdIo.Pipe => %return os.posixDup2(pipe_fd, std_fileno),
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StdIo.Close => os.posixClose(std_fileno),
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StdIo.Inherit => {},
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StdIo.Ignore => %return os.posixDup2(dev_null_fd, std_fileno),
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}
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}
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};
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fn makePipe() -> %[2]i32 {
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var fds: [2]i32 = undefined;
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const err = posix.getErrno(posix.pipe(&fds));
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if (err > 0) {
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return switch (err) {
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errno.EMFILE, errno.ENFILE => error.SysResources,
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else => error.Unexpected,
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}
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}
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return fds;
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}
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fn destroyPipe(pipe: &const [2]i32) {
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os.posixClose((*pipe)[0]);
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os.posixClose((*pipe)[1]);
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}
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// Child of fork calls this to report an error to the fork parent.
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// Then the child exits.
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fn forkChildErrReport(fd: i32, err: error) -> noreturn {
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_ = writeIntFd(fd, ErrInt(err));
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posix.exit(1);
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}
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const ErrInt = @intType(false, @sizeOf(error) * 8);
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fn writeIntFd(fd: i32, value: ErrInt) -> %void {
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var bytes: [@sizeOf(ErrInt)]u8 = undefined;
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mem.writeInt(bytes[0...], value, true);
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var index: usize = 0;
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while (index < bytes.len) {
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const amt_written = posix.write(fd, &bytes[index], bytes.len - index);
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const err = posix.getErrno(amt_written);
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if (err > 0) {
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switch (err) {
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errno.EINTR => continue,
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errno.EINVAL => unreachable,
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else => return error.SysResources,
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}
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}
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index += amt_written;
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}
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}
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fn readIntFd(fd: i32) -> %ErrInt {
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var bytes: [@sizeOf(ErrInt)]u8 = undefined;
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var index: usize = 0;
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while (index < bytes.len) {
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const amt_written = posix.read(fd, &bytes[index], bytes.len - index);
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const err = posix.getErrno(amt_written);
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if (err > 0) {
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switch (err) {
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errno.EINTR => continue,
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errno.EINVAL => unreachable,
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else => return error.SysResources,
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}
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}
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index += amt_written;
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}
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return mem.readInt(bytes[0...], ErrInt, true);
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}
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