Refactor ShellManager process spawning
This commit is contained in:
Maxime Coste
parent
8898571a44
commit
bb96ad44b2
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@ -34,7 +34,7 @@ public:
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void run(EventMode mode);
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void close_fd();
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bool closed() const { return m_fd == -1; }
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void disable() { m_fd = -1; }
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private:
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int m_fd;
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@ -13,8 +13,6 @@
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namespace Kakoune
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{
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static const Regex env_var_regex(R"(\bkak_(\w+)\b)");
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ShellManager::ShellManager()
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{
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const char* path = getenv("PATH");
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@ -22,117 +20,152 @@ ShellManager::ShellManager()
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setenv("PATH", new_path.c_str(), 1);
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}
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namespace
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{
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struct Pipe
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{
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Pipe() { pipe(m_fd); }
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~Pipe() { close_read_fd(); close_write_fd(); }
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int read_fd() const { return m_fd[0]; }
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int write_fd() const { return m_fd[1]; }
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void close_read_fd() { close_fd(m_fd[0]); }
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void close_write_fd() { close_fd(m_fd[1]); }
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private:
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void close_fd(int& fd) { if (fd != -1) { close(fd); fd = -1; } }
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int m_fd[2];
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};
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pid_t spawn_process(StringView cmdline, ConstArrayView<String> params, ConstArrayView<String> kak_env,
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const Pipe& child_stdout, const Pipe& child_stdin, const Pipe& child_stderr)
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{
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Vector<const char*> envptrs;
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for (char** envp = environ; *envp; ++envp)
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envptrs.push_back(*envp);
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for (auto& env : kak_env)
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envptrs.push_back(env.c_str());
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envptrs.push_back(nullptr);
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const char* shell = "/bin/sh";
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auto cmdlinezstr = cmdline.zstr();
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Vector<const char*> execparams = { shell, "-c", cmdlinezstr };
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if (not params.empty())
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execparams.push_back(shell);
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for (auto& param : params)
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execparams.push_back(param.c_str());
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execparams.push_back(nullptr);
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if (pid_t pid = fork())
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return pid;
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auto move = [](int oldfd, int newfd) { dup2(oldfd, newfd); close(oldfd); };
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close(child_stdout.write_fd());
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move(child_stdout.read_fd(), 0);
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close(child_stdin.read_fd());
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move(child_stdin.write_fd(), 1);
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close(child_stderr.read_fd());
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move(child_stderr.write_fd(), 2);
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execve(shell, (char* const*)execparams.data(), (char* const*)envptrs.data());
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exit(-1);
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return -1;
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}
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}
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std::pair<String, int> ShellManager::eval(
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StringView cmdline, const Context& context, StringView input,
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Flags flags, ConstArrayView<String> params, const EnvVarMap& env_vars)
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{
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int write_pipe[2]; // child stdin
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int read_pipe[2]; // child stdout
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int error_pipe[2]; // child stderr
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static const Regex re(R"(\bkak_(\w+)\b)");
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::pipe(write_pipe);
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::pipe(read_pipe);
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::pipe(error_pipe);
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if (pid_t pid = fork())
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Vector<String> kak_env;
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for (RegexIterator<const char*> it{cmdline.begin(), cmdline.end(), re}, end;
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it != end; ++it)
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{
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close(write_pipe[0]);
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close(read_pipe[1]);
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close(error_pipe[1]);
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StringView name{(*it)[1].first, (*it)[1].second};
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write(write_pipe[1], input.data(), (int)input.length());
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close(write_pipe[1]);
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auto match_name = [&](const String& s) {
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return s.length() > name.length() and
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prefix_match(s, name) and s[name.length()] == '=';
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};
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if (find_if(kak_env, match_name) != kak_env.end())
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continue;
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String child_stdout, child_stderr;
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int status = 0;
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auto var_it = env_vars.find(name);
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try
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{
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auto pipe_reader = [](String& output) {
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return [&output](FDWatcher& watcher, EventMode) {
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char buffer[1024];
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size_t size = read(watcher.fd(), buffer, 1024);
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if (size <= 0)
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watcher.close_fd();
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output += StringView{buffer, buffer+size};
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};
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};
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const String& value = var_it != env_vars.end() ?
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var_it->value : get_val(name, context);
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FDWatcher stdout_watcher{read_pipe[0], pipe_reader(child_stdout)};
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FDWatcher stderr_watcher{error_pipe[0], pipe_reader(child_stderr)};
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// block SIGCHLD to make sure we wont receive it before
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// our call to pselect, that will end up blocking indefinitly.
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sigset_t mask, orig_mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &mask, &orig_mask);
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// check for termination now that SIGCHLD is blocked
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bool terminated = waitpid(pid, &status, WNOHANG);
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while (not terminated or
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((flags & Flags::WaitForStdout) and
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(not stdout_watcher.closed() or
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not stderr_watcher.closed())))
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{
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EventManager::instance().handle_next_events(EventMode::Urgent, &orig_mask);
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if (not terminated)
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terminated = waitpid(pid, &status, WNOHANG);
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}
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stdout_watcher.close_fd();
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stderr_watcher.close_fd();
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sigprocmask(SIG_SETMASK, &orig_mask, nullptr);
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}
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if (not child_stderr.empty())
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write_to_debug_buffer(format("shell stderr: <<<\n{}>>>", child_stderr));
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return { child_stdout, WIFEXITED(status) ? WEXITSTATUS(status) : - 1 };
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kak_env.push_back(format("kak_{}={}", name, value));
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} catch (runtime_error&) {}
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}
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else try
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Pipe child_stdin, child_stdout, child_stderr;
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pid_t pid = spawn_process(cmdline, params, kak_env,
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child_stdin, child_stdout, child_stderr);
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child_stdin.close_read_fd();
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child_stdout.close_write_fd();
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child_stderr.close_write_fd();
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write(child_stdin.write_fd(), input.data(), (int)input.length());
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child_stdin.close_write_fd();
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struct PipeReader : FDWatcher
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{
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close(write_pipe[1]);
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close(read_pipe[0]);
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close(error_pipe[0]);
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PipeReader(Pipe& pipe, String& contents)
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: FDWatcher(pipe.read_fd(),
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[&contents, &pipe](FDWatcher& watcher, EventMode) {
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char buffer[1024];
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size_t size = read(pipe.read_fd(), buffer, 1024);
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if (size <= 0)
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{
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pipe.close_read_fd();
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watcher.disable();
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return;
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}
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contents += StringView{buffer, buffer+size};
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})
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{}
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};
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dup2(read_pipe[1], 1); close(read_pipe[1]);
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dup2(error_pipe[1], 2); close(error_pipe[1]);
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dup2(write_pipe[0], 0); close(write_pipe[0]);
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String stdout_contents, stderr_contents;
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PipeReader stdout_reader{child_stdout, stdout_contents};
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PipeReader stderr_reader{child_stderr, stderr_contents};
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using RegexIt = RegexIterator<StringView::iterator>;
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for (RegexIt it{cmdline.begin(), cmdline.end(), env_var_regex}, end;
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it != end; ++it)
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{
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auto& match = *it;
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// block SIGCHLD to make sure we wont receive it before
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// our call to pselect, that will end up blocking indefinitly.
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sigset_t mask, orig_mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGCHLD);
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sigprocmask(SIG_BLOCK, &mask, &orig_mask);
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auto restore_mask = on_scope_end([&] { sigprocmask(SIG_SETMASK, &orig_mask, nullptr); });
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StringView name{match[1].first, match[1].second};
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kak_assert(name.length() > 0);
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int status = 0;
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// check for termination now that SIGCHLD is blocked
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bool terminated = waitpid(pid, &status, WNOHANG);
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auto local_var = env_vars.find(name);
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if (local_var != env_vars.end())
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setenv(("kak_" + name).c_str(), local_var->value.c_str(), 1);
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else try
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{
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String value = get_val(name, context);
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setenv(format("kak_{}", name).c_str(), value.c_str(), 1);
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}
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catch (runtime_error&) {}
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}
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const char* shell = "/bin/sh";
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auto cmdlinezstr = cmdline.zstr();
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Vector<const char*> execparams = { shell, "-c", cmdlinezstr };
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if (not params.empty())
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execparams.push_back(shell);
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for (auto& param : params)
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execparams.push_back(param.c_str());
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execparams.push_back(nullptr);
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execvp(shell, (char* const*)execparams.data());
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exit(-1);
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while (not terminated or
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((flags & Flags::WaitForStdout) and
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(child_stdout.read_fd() != -1 or child_stderr.read_fd() != -1)))
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{
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EventManager::instance().handle_next_events(EventMode::Urgent, &orig_mask);
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if (not terminated)
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terminated = waitpid(pid, &status, WNOHANG);
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}
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catch (...) { exit(-1); }
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return {};
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if (not stderr_contents.empty())
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write_to_debug_buffer(format("shell stderr: <<<\n{}>>>", stderr_contents));
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return { stdout_contents, WIFEXITED(status) ? WEXITSTATUS(status) : -1 };
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}
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void ShellManager::register_env_var(StringView str, bool prefix,
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