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Kernel: Add support for the WSTOPPED flag to the waitpid() syscall.
This makes waitpid() return when a child process is stopped via a signal. Use this in Shell to catch stopped children and return control to the command line. :^) Fixes #298.
This commit is contained in:
parent
de03b72979
commit
3073ea7d84
Notes:
sideshowbarker
2024-07-19 13:16:33 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/3073ea7d84b
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@ -1393,8 +1393,12 @@ int Process::reap(Process& process)
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pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
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{
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dbgprintf("sys$waitpid(%d, %p, %d)\n", waitee, wstatus, options);
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// FIXME: Respect options
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(void)options;
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if (!options) {
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// FIXME: This can't be right.. can it? Figure out how this should actually work.
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options = WEXITED;
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}
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if (wstatus)
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if (!validate_write_typed(wstatus))
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return -EFAULT;
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@ -1409,6 +1413,7 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
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}
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if (options & WNOHANG) {
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// FIXME: Figure out what WNOHANG should do with stopped children.
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if (waitee == -1) {
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pid_t reaped_pid = 0;
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InterruptDisabler disabler;
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@ -1417,7 +1422,7 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
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reaped_pid = process.pid();
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exit_status = reap(process);
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}
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return true;
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return IterationDecision::Continue;
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});
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return reaped_pid;
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} else {
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@ -1435,17 +1440,22 @@ pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
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}
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current->m_waitee_pid = waitee;
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current->m_wait_options = options;
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current->block(Thread::State::BlockedWait);
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if (current->m_was_interrupted_while_blocked)
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return -EINTR;
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Process* waitee_process;
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{
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InterruptDisabler disabler;
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// NOTE: If waitee was -1, m_waitee will have been filled in by the scheduler.
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waitee_process = Process::from_pid(current->m_waitee_pid);
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}
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InterruptDisabler disabler;
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// NOTE: If waitee was -1, m_waitee_pid will have been filled in by the scheduler.
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Process* waitee_process = Process::from_pid(current->m_waitee_pid);
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ASSERT(waitee_process);
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exit_status = reap(*waitee_process);
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if (waitee_process->is_dead()) {
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exit_status = reap(*waitee_process);
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} else {
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ASSERT(waitee_process->main_thread().state() == Thread::State::Stopped);
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exit_status = 0x7f;
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}
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return current->m_waitee_pid;
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}
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@ -411,7 +411,7 @@ inline void Process::for_each_child(Callback callback)
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for (auto* process = g_processes->head(); process;) {
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auto* next_process = process->next();
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if (process->ppid() == my_pid) {
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if (!callback(*process))
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if (callback(*process) == IterationDecision::Break)
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break;
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}
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process = next_process;
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@ -83,14 +83,21 @@ bool Scheduler::pick_next()
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if (thread.state() == Thread::BlockedWait) {
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process.for_each_child([&](Process& child) {
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if (!child.is_dead())
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return true;
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if (thread.waitee_pid() == -1 || thread.waitee_pid() == child.pid()) {
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thread.m_waitee_pid = child.pid();
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thread.unblock();
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return false;
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}
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return true;
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if (thread.waitee_pid() != -1 && thread.waitee_pid() != child.pid())
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return IterationDecision::Continue;
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bool child_exited = child.is_dead();
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bool child_stopped = child.main_thread().state() == Thread::State::Stopped;
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bool wait_finished = ((thread.m_wait_options & WEXITED) && child_exited)
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|| ((thread.m_wait_options & WSTOPPED) && child_stopped);
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if (!wait_finished)
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return IterationDecision::Continue;
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thread.m_waitee_pid = child.pid();
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thread.unblock();
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return IterationDecision::Break;
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});
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return IterationDecision::Continue;
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}
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@ -182,6 +182,7 @@ private:
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RefPtr<Region> m_kernel_stack_region;
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RefPtr<Region> m_kernel_stack_for_signal_handler_region;
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pid_t m_waitee_pid { -1 };
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int m_wait_options { 0 };
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RefPtr<FileDescription> m_blocked_description;
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timeval m_select_timeout;
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SignalActionData m_signal_action_data[32];
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@ -3,6 +3,10 @@
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#include <AK/Types.h>
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#define WNOHANG 1
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#define WUNTRACED 2
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#define WSTOPPED WUNTRACED
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#define WEXITED 4
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#define WCONTINUED 8
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#define R_OK 4
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#define W_OK 2
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@ -488,7 +488,7 @@ static int run_command(const String& cmd)
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for (int i = 0; i < children.size(); ++i) {
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auto& child = children[i];
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do {
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int rc = waitpid(child.pid, &wstatus, 0);
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int rc = waitpid(child.pid, &wstatus, WEXITED | WSTOPPED);
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if (rc < 0 && errno != EINTR) {
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if (errno != ECHILD)
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perror("waitpid");
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@ -499,6 +499,8 @@ static int run_command(const String& cmd)
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printf("Shell: %s(%d) exited with status %d\n", child.name.characters(), child.pid, WEXITSTATUS(wstatus));
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if (i == 0)
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return_value = WEXITSTATUS(wstatus);
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} else if (WIFSTOPPED(wstatus)) {
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printf("Shell: %s(%d) stopped.\n", child.name.characters(), child.pid);
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} else {
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if (WIFSIGNALED(wstatus)) {
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printf("Shell: %s(%d) exited due to signal '%s'\n", child.name.characters(), child.pid, strsignal(WTERMSIG(wstatus)));
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