channels: reflect exit due to signals in exit status code (#10573)

Uses `128 + term_signal` in case of exit due to a signal.

Fixes https://github.com/neovim/neovim/issues/10571.

src/nvim/eval.c

@@ -12354,7 +12354,6 @@ static void f_jobstop(typval_T *argvars, typval_T *rettv, FunPtr fptr)
     return;
   }
 
-
   Channel *data = find_job(argvars[0].vval.v_number, true);
   if (!data) {
     return;

src/nvim/event/libuv_process.c

@@ -101,6 +101,10 @@ static void close_cb(uv_handle_t *handle)
 static void exit_cb(uv_process_t *handle, int64_t status, int term_signal)
 {
   Process *proc = handle->data;
-  proc->status = (int)status;
+#if defined(WIN32)
+  // Use stored/expected signal.
+  term_signal = proc->exit_signal;
+#endif
+  proc->status = term_signal ? 128 + term_signal : (int)status;
   proc->internal_exit_cb(proc);
 }

src/nvim/event/process.c

@@ -159,7 +159,7 @@ void process_close_streams(Process *proc) FUNC_ATTR_NONNULL_ALL
 ///                 0 for no wait. -1 to wait until the process quits.
 /// @return Exit code of the process. proc->status will have the same value.
 ///         -1 if the timeout expired while the process is still running.
-///         -2 if the user interruped the wait.
+///         -2 if the user interrupted the wait.
 int process_wait(Process *proc, int ms, MultiQueue *events)
   FUNC_ATTR_NONNULL_ARG(1)
 {
@@ -220,6 +220,7 @@ void process_stop(Process *proc) FUNC_ATTR_NONNULL_ALL
     return;
   }
   proc->stopped_time = os_hrtime();
+  proc->exit_signal = SIGTERM;
 
   switch (proc->type) {
     case kProcessTypeUv:
@@ -253,8 +254,10 @@ static void children_kill_cb(uv_timer_t *handle)
     }
     uint64_t term_sent = UINT64_MAX == proc->stopped_time;
     if (kProcessTypePty != proc->type || term_sent) {
+      proc->exit_signal = SIGKILL;
       os_proc_tree_kill(proc->pid, SIGKILL);
     } else {
+      proc->exit_signal = SIGTERM;
       os_proc_tree_kill(proc->pid, SIGTERM);
       proc->stopped_time = UINT64_MAX;  // Flag: SIGTERM was sent.
       // Restart timer.
@@ -403,4 +406,3 @@ static void on_process_stream_close(Stream *stream, void *data)
   Process *proc = data;
   decref(proc);
 }
-

src/nvim/event/process.h

@@ -19,6 +19,7 @@ struct process {
   Loop *loop;
   void *data;
   int pid, status, refcount;
+  uint8_t exit_signal;  // Signal used when killing (on Windows).
   uint64_t stopped_time;  // process_stop() timestamp
   const char *cwd;
   char **argv;

src/nvim/os/pty_process_unix.c

@@ -288,7 +288,7 @@ static void chld_handler(uv_signal_t *handle, int signum)
     if (WIFEXITED(stat)) {
       proc->status = WEXITSTATUS(stat);
     } else if (WIFSIGNALED(stat)) {
-      proc->status = WTERMSIG(stat);
+      proc->status = 128 + WTERMSIG(stat);
     }
     proc->internal_exit_cb(proc);
   }

src/nvim/os/pty_process_win.c

@@ -252,7 +252,7 @@ static void pty_process_finish2(PtyProcess *ptyproc)
 
   DWORD exit_code = 0;
   GetExitCodeProcess(ptyproc->process_handle, &exit_code);
-  proc->status = (int)exit_code;
+  proc->status = proc->exit_signal ? 128 + proc->exit_signal : (int)exit_code;
 
   CloseHandle(ptyproc->process_handle);
   ptyproc->process_handle = NULL;