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From c6ea93fcb499c84c3d8e9aad2ced65065a3f6d51 Mon Sep 17 00:00:00 2001
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From: Fujii Masao <fujii@postgresql.org>
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Date: Tue, 19 Jul 2022 22:34:08 +0900
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Subject: [PATCH] Fix bug in handling of child process exit.
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When storage_mon detects that a child process exits with zero,
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it resets the test_forks[] entry for the child process to 0, to avoid
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waitpid() for the process again in the loop. But, previously,
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storage_mon didn't do that when it detected that a child process
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exited with non-zero. Which caused waitpid() to be called again
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for the process already gone and to report an error like
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"waitpid on XXX failed: No child processes" unexpectedly.
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In this case, basically storage_mon should wait until all the child
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processes exit and return the final score, instead.
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This patch fixes this issue by making storage_mon reset test_works[]
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entry even when a child process exits with non-zero.
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---
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tools/storage_mon.c | 8 ++++----
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1 file changed, 4 insertions(+), 4 deletions(-)
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diff --git a/tools/storage_mon.c b/tools/storage_mon.c
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index 3c82d5ee8..83a48ca36 100644
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--- a/tools/storage_mon.c
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+++ b/tools/storage_mon.c
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@@ -232,13 +232,13 @@ int main(int argc, char *argv[])
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if (w == test_forks[i]) {
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if (WIFEXITED(wstatus)) {
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- if (WEXITSTATUS(wstatus) == 0) {
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- finished_count++;
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- test_forks[i] = 0;
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- } else {
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+ if (WEXITSTATUS(wstatus) != 0) {
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syslog(LOG_ERR, "Error reading from device %s", devices[i]);
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final_score += scores[i];
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}
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+
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+ finished_count++;
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+ test_forks[i] = 0;
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}
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}
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}
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