If the `get_next_task` did not explicitly called child_process_init
and only filled in some fields, there may have been some stale data
in the child process. This is hard to debug and also adds a review
burden for each new user of that API. To improve the situation, we
pass only cleanly initialized child structs to the get_next_task.
As an invariant you can now assume any child not in use is
cleaned up and ready for its next reuse.
Signed-off-by: Stefan Beller <sbel...@google.com>
---
run-command.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/run-command.c b/run-command.c
index b9363da..a5ef874 100644
--- a/run-command.c
+++ b/run-command.c
@@ -13,6 +13,12 @@ void child_process_init(struct child_process *child)
argv_array_init(&child->env_array);
}
+void child_process_deinit(struct child_process *child)
+{
+ argv_array_clear(&child->args);
+ argv_array_clear(&child->env_array);
+}
+
struct child_to_clean {
pid_t pid;
struct child_to_clean *next;
@@ -962,6 +968,7 @@ static struct parallel_processes *pp_init(int n,
for (i = 0; i < n; i++) {
strbuf_init(&pp->children[i].err, 0);
+ child_process_init(&pp->children[i].process);
pp->pfd[i].events = POLLIN;
pp->pfd[i].fd = -1;
}
@@ -973,8 +980,10 @@ static void pp_cleanup(struct parallel_processes *pp)
{
int i;
- for (i = 0; i < pp->max_processes; i++)
+ for (i = 0; i < pp->max_processes; i++) {
strbuf_release(&pp->children[i].err);
+ child_process_deinit(&pp->children[i].process);
+ }
free(pp->children);
free(pp->pfd);
@@ -1134,6 +1143,8 @@ static int pp_collect_finished(struct parallel_processes
*pp)
pp->nr_processes--;
pp->children[i].in_use = 0;
pp->pfd[i].fd = -1;
+ child_process_deinit(&pp->children[i].process);
+ child_process_init(&pp->children[i].process);
if (i != pp->output_owner) {
strbuf_addbuf(&pp->buffered_output,
&pp->children[i].err);
--
2.5.0.275.gbfc1651.dirty
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