From 8f7f73e4af916bf1bc6a0cb72be35b7061b297df Mon Sep 17 00:00:00 2001
From: David Steele <david@pgmasters.net>
Date: Thu, 30 Mar 2023 17:46:25 +0500
Subject: [PATCH] Sleep using nanosleep() instead of select().

This is a safer way to sleep due to select's not-portable interaction with signals.

Based on https://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=a948e49e2ef11815be0b211723bfc5b53b7f75a8 from the PostgreSQL project.
---
 src/common/time.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/common/time.c b/src/common/time.c
index da634f857..d9b7d5117 100644
--- a/src/common/time.c
+++ b/src/common/time.c
@@ -28,7 +28,7 @@ timeMSec(void)
 
 /**********************************************************************************************************************************/
 FN_EXTERN void
-sleepMSec(TimeMSec sleepMSec)
+sleepMSec(const TimeMSec sleepMSec)
 {
     FUNCTION_TEST_BEGIN();
         FUNCTION_TEST_PARAM(UINT64, sleepMSec);
@@ -36,10 +36,13 @@ sleepMSec(TimeMSec sleepMSec)
 
     if (sleepMSec > 0)
     {
-        struct timeval delay;
-        delay.tv_sec = (time_t)(sleepMSec / MSEC_PER_SEC);
-        delay.tv_usec = (suseconds_t)(sleepMSec % MSEC_PER_SEC * 1000);
-        select(0, NULL, NULL, NULL, &delay);
+        const struct timespec delay =
+        {
+            .tv_sec = (time_t)(sleepMSec / MSEC_PER_SEC),
+            .tv_nsec = (long)(sleepMSec % MSEC_PER_SEC * 1000000),
+        };
+
+        nanosleep(&delay, NULL);
     }
 
     FUNCTION_TEST_RETURN_VOID();