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nvim_get_proc_children: fallback to shell

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/proc/…/children may be unavailable because of an unset kernel option.
Fallback to `pgrep` invoked in a shell.
This commit is contained in:
Justin M. Keyes
2018-03-14 23:26:37 +01:00
parent dbad797edd
commit 12af7016e2
3 changed files with 43 additions and 8 deletions
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24
src/nvim/api/vim.c
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@@ -1482,7 +1482,7 @@ Array nvim_list_uis(void)
/// Gets the immediate children of process `pid`.
///
/// @return Array of child process ids, or empty array if process not found.
/// @return Array of child process ids. Empty array if process not found.
Array nvim_get_proc_children(Integer pid, Error *err)
FUNC_API_SINCE(4)
{
@@ -1490,17 +1490,27 @@ Array nvim_get_proc_children(Integer pid, Error *err)
int *proc_list = NULL;
if (pid <= 0 || pid > INT_MAX) {
api_set_error(err, kErrorTypeException, "Invalid pid: %d", pid);
api_set_error(err, kErrorTypeException, "Invalid pid: %" PRId64, pid);
goto end;
}
size_t proc_count;
int rv = os_proc_children((int)pid, &proc_list, &proc_count);
if (rv == 1) {
goto end; // Process not found; return empty list.
} else if (rv != 0) {
api_set_error(err, kErrorTypeException,
"Failed to get process children. pid=%d error=%d", pid, rv);
if (rv != 0) {
// syscall failed (possibly because of kernel options), try shelling out.
Array a = ARRAY_DICT_INIT;
ADD(a, INTEGER_OBJ(pid));
String s = cstr_to_string("return vim._os_proc_children(select(1, ...))");
Object o = nvim_execute_lua(s, a, err);
api_free_string(s);
api_free_array(a);
if (o.type == kObjectTypeArray) {
proc_array = o.data.array;
} else if (!ERROR_SET(err)) {
api_set_error(err, kErrorTypeException,
"Failed to get process children. pid=%" PRId64 " error=%d",
pid, rv);
}
goto end;
}