From 9328beec56caa104304d16547c724ebb7df5fb69 Mon Sep 17 00:00:00 2001
From: Robert O'Callahan <robert@ocallahan.org>
Date: Fri, 23 Aug 2024 16:36:31 +1200
Subject: [PATCH] Use `syscall(SYS_gettid)` because `gettid()` is only in
 new-ish glibc

---
 src/ContextSwitchEvent.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ContextSwitchEvent.cc b/src/ContextSwitchEvent.cc
index 541ca0184d0..4eb45e69a12 100644
--- a/src/ContextSwitchEvent.cc
+++ b/src/ContextSwitchEvent.cc
@@ -73,7 +73,7 @@ static bool can_use_switch_records() {
   }
   struct f_owner_ex own;
   own.type = F_OWNER_TID;
-  own.pid = gettid();
+  own.pid = syscall(SYS_gettid);
   ret = fcntl(fd, F_SETOWN_EX, &own);
   if (ret < 0) {
     FATAL() << "Failed to fcntl(SETOWN_EX)";