Am 02.04.2013 12:31, schrieb Felipe Contreras:
> And persistent_waitpid() to recover the information from the last run.
I'm not a fan of this new API, because it looks like a workaround
for a problem that should have been solved in a cleaner way. But if
we can't avoid it, please also add a paragraph to
Documentation/technical/api-run-command.txt
> +int check_command(struct child_process *cmd)
> +{
> + int status;
> + pid_t waiting;
> +
> + if (cmd->last_status.valid)
> + return 0;
> +
> + while ((waiting = waitpid(cmd->pid, &status, WNOHANG)) < 0 && errno ==
> EINTR)
> + ; /* nothing */
> +
> + if (!waiting)
> + return 1;
> +
> + if (waiting == cmd->pid) {
> + cmd->last_status.valid = 1;
> + cmd->last_status.status = status;
> + return 0;
> + }
> +
> + if (waiting > 0)
> + die("BUG: waitpid reported a random pid?");
> +
> + return 0;
> +}
> +
> static void prepare_run_command_v_opt(struct child_process *cmd,
> const char **argv,
> int opt)
> @@ -729,7 +770,7 @@ error:
> int finish_async(struct async *async)
> {
> #ifdef NO_PTHREADS
> - return wait_or_whine(async->pid, "child process");
> + return wait_or_whine(cmd, async->pid, "child process");
This breaks the NO_PTHREADS build because cmd is undeclared. Perhaps
this on top:
diff --git a/run-command.c b/run-command.c
index a9fa779..a02ef62 100644
--- a/run-command.c
+++ b/run-command.c
@@ -230,7 +230,7 @@ static pid_t persistent_waitpid(struct child_process *cmd,
pid_t pid, int *statu
{
pid_t waiting;
- if (cmd->last_status.valid) {
+ if (cmd && cmd->last_status.valid) {
*status = cmd->last_status.status;
return pid;
}
@@ -771,7 +771,7 @@ int start_async(struct async *async)
int finish_async(struct async *async)
{
#ifdef NO_PTHREADS
- return wait_or_whine(cmd, async->pid, "child process");
+ return wait_or_whine(NULL, async->pid, "child process");
#else
void *ret = (void *)(intptr_t)(-1);
--
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