/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Execution.h"
#include "Shell.h"
#include <LibCore/ArgsParser.h>
#include <LibCore/Event.h>
#include <LibCore/EventLoop.h>
#include <LibCore/File.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
RefPtr<Line::Editor> editor;
Shell* s_shell;
void FileDescriptionCollector::collect()
{
for (auto fd : m_fds)
close(fd);
m_fds.clear();
}
FileDescriptionCollector::~FileDescriptionCollector()
{
collect();
}
void FileDescriptionCollector::add(int fd)
{
m_fds.append(fd);
}
SavedFileDescriptors::SavedFileDescriptors(const NonnullRefPtrVector<AST::Rewiring>& intended_rewirings)
{
for (auto& rewiring : intended_rewirings) {
int new_fd = dup(rewiring.source_fd);
if (new_fd < 0) {
if (errno != EBADF)
perror("dup");
// The fd that will be overwritten isn't open right now,
// it will be cleaned up by the exec()-side collector
// and we have nothing to do here, so just ignore this error.
continue;
}
auto flags = fcntl(new_fd, F_GETFL);
auto rc = fcntl(new_fd, F_SETFL, flags | FD_CLOEXEC);
ASSERT(rc == 0);
m_saves.append({ rewiring.source_fd, new_fd });
m_collector.add(new_fd);
}
}
SavedFileDescriptors::~SavedFileDescriptors()
{
for (auto& save : m_saves) {
if (dup2(save.saved, save.original) < 0) {
perror("dup2(~SavedFileDescriptors)");
continue;
}
}
}
int main(int argc, char** argv)
{
Core::EventLoop loop;
Core::EventLoop::register_signal(SIGINT, [](int) {
editor->interrupted();
s_shell->kill_job(s_shell->current_job(), SIGINT);
});
Core::EventLoop::register_signal(SIGWINCH, [](int) {
editor->resized();
s_shell->kill_job(s_shell->current_job(), SIGWINCH);
});
Core::EventLoop::register_signal(SIGTTIN, [](int) {});
Core::EventLoop::register_signal(SIGTTOU, [](int) {});
Core::EventLoop::register_signal(SIGHUP, [](int) {
for (auto& it : s_shell->jobs)
s_shell->kill_job(it.value.ptr(), SIGHUP);
s_shell->save_history();
});
Core::EventLoop::register_signal(SIGCHLD, [](int) {
auto& jobs = s_shell->jobs;
Vector<u64> disowned_jobs;
for (auto& it : jobs) {
auto job_id = it.key;
auto& job = *it.value;
int wstatus = 0;
auto child_pid = waitpid(job.pid(), &wstatus, WNOHANG | WUNTRACED);
if (child_pid < 0) {
if (errno == ECHILD) {
// The child process went away before we could process its death, just assume it exited all ok.
// FIXME: This should never happen, the child should stay around until we do the waitpid above.
dbg() << "Child process gone, cannot get exit code for " << job_id;
child_pid = job.pid();
} else {
ASSERT_NOT_REACHED();
}
}
#ifndef __serenity__
if (child_pid == 0) {
// Linux: if child didn't "change state", but existed.
continue;
}
#endif
if (child_pid == job.pid()) {
if (WIFSIGNALED(wstatus) && !WIFSTOPPED(wstatus)) {
job.set_signalled(WTERMSIG(wstatus));
} else if (WIFEXITED(wstatus)) {
job.set_has_exit(WEXITSTATUS(wstatus));
} else if (WIFSTOPPED(wstatus)) {
job.unblock();
job.set_is_suspended(true);
}
}
if (job.should_be_disowned())
disowned_jobs.append(job_id);
}
for (auto job_id : disowned_jobs)
jobs.remove(job_id);
});
Core::EventLoop::register_signal(SIGTSTP, [](auto) {
auto job = s_shell->current_job();
s_shell->kill_job(job, SIGTSTP);
if (job) {
job->set_is_suspended(true);
job->unblock();
}
});
#ifndef __serenity__
sigset_t blocked;
sigemptyset(&blocked);
sigaddset(&blocked, SIGTTOU);
sigaddset(&blocked, SIGTTIN);
pthread_sigmask(SIG_BLOCK, &blocked, NULL);
#endif
#ifdef __serenity__
if (pledge("stdio rpath wpath cpath proc exec tty accept sigaction", nullptr) < 0) {
perror("pledge");
return 1;
}
#endif
editor = Line::Editor::construct();
auto shell = Shell::construct();
s_shell = shell.ptr();
editor->initialize();
shell->termios = editor->termios();
shell->default_termios = editor->default_termios();
editor->on_display_refresh = [&](auto& editor) {
editor.strip_styles();
shell->highlight(editor);
};
editor->on_tab_complete = [&](const Line::Editor& editor) {
return shell->complete(editor);
};
const char* command_to_run = nullptr;
const char* file_to_read_from = nullptr;
Vector<const char*> script_args;
bool skip_rc_files = false;
Core::ArgsParser parser;
parser.add_option(command_to_run, "String to read commands from", "command-string", 'c', "command-string");
parser.add_option(skip_rc_files, "Skip running shellrc files", "skip-shellrc", 0);
parser.add_positional_argument(file_to_read_from, "File to read commands from", "file", Core::ArgsParser::Required::No);
parser.add_positional_argument(script_args, "Extra argumets to pass to the script (via $* and co)", "argument", Core::ArgsParser::Required::No);
parser.parse(argc, argv);
if (!skip_rc_files) {
auto run_rc_file = [&](auto& name) {
String file_path = name;
if (file_path.starts_with('~'))
file_path = shell->expand_tilde(file_path);
if (Core::File::exists(file_path)) {
shell->run_file(file_path, false);
}
};
run_rc_file(Shell::global_init_file_path);
run_rc_file(Shell::local_init_file_path);
}
{
Vector<String> args;
for (auto* arg : script_args)
args.empend(arg);
shell->set_local_variable("ARGV", adopt(*new AST::ListValue(move(args))));
}
if (command_to_run) {
dbgprintf("sh -c '%s'\n", command_to_run);
shell->run_command(command_to_run);
return 0;
}
if (file_to_read_from && StringView { "-" } != file_to_read_from) {
if (shell->run_file(file_to_read_from))
return 0;
return 1;
}
editor->on_interrupt_handled = [&] {
editor->finish();
};
shell->add_child(*editor);
Core::EventLoop::current().post_event(*shell, make<Core::CustomEvent>(Shell::ShellEventType::ReadLine));
return loop.exec();
}