Implement basic support for times().

The kernel now bills processes for time spent in kernelspace and userspace
separately. The accounting is forwarded to the parent process in reap().

This makes the "time" builtin in bash work.

1 files changed, 19 insertions, 0 deletions

diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
index c47aaf5def..3a1db69a26 100644
--- a/Kernel/Process.cpp
+++ b/Kernel/Process.cpp
@@ -1415,6 +1415,14 @@ int Process::reap(Process& process)
 {
     InterruptDisabler disabler;
     int exit_status = (process.m_termination_status << 8) | process.m_termination_signal;
+
+    if (process.ppid()) {
+        auto* parent = Process::from_pid(process.ppid());
+        ASSERT(parent);
+        parent->m_ticks_in_user_for_dead_children += process.m_ticks_in_user + process.m_ticks_in_user_for_dead_children;
+        parent->m_ticks_in_kernel_for_dead_children += process.m_ticks_in_kernel + process.m_ticks_in_kernel_for_dead_children;
+    }
+
     dbgprintf("reap: %s(%u) {%s}\n", process.name().characters(), process.pid(), toString(process.state()));
     ASSERT(process.state() == Dead);
     g_processes->remove(&process);
@@ -1763,3 +1771,14 @@ int Process::sys$mkdir(const char* pathname, mode_t mode)
         return error;
     return 0;
 }
+
+Unix::clock_t Process::sys$times(Unix::tms* times)
+{
+    if (!validate_write_typed(times))
+        return -EFAULT;
+    times->tms_utime = m_ticks_in_user;
+    times->tms_stime = m_ticks_in_kernel;
+    times->tms_cutime = m_ticks_in_user_for_dead_children;
+    times->tms_cstime = m_ticks_in_kernel_for_dead_children;
+    return 0;
+}