[compiler-rt] [compiler-rt][rtsan] Fix recvmmsg rtsan interceptor for glibc < 2.21 (PR #123664)

[David CARLIER via llvm-commits]

https://github.com/devnexen updated https://github.com/llvm/llvm-project/pull/123664

>From e08634bf10ea39fbf1e2eb8d2fb63035e94a6f7d Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen at gmail.com>
Date: Mon, 20 Jan 2025 20:00:30 +0000
Subject: [PATCH] [compiler-rt][rtsan] Fix recvmmsg rtsan interceptor for glibc
 < 2.21

linux/glibc prior to 2.21 had a different signature for recvmmsg.

Fix #123434
---
 compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp b/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
index 34c2d4cb37fd0c..2d8ab696835081 100644
--- a/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
+++ b/compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
@@ -927,8 +927,13 @@ INTERCEPTOR(ssize_t, recvmsg, int socket, struct msghdr *message, int flags) {
 }
 
 #if SANITIZER_INTERCEPT_RECVMMSG
+#if defined(__GLIBC_MINOR__) && __GLIBC_MINOR__ < 21
+INTERCEPTOR(int, recvmmsg, int socket, struct mmsghdr *message,
+            unsigned int len, int flags, const struct timespec *timeout) {
+#else
 INTERCEPTOR(int, recvmmsg, int socket, struct mmsghdr *message,
             unsigned int len, int flags, struct timespec *timeout) {
+#endif
   __rtsan_notify_intercepted_call("recvmmsg");
   return REAL(recvmmsg)(socket, message, len, flags, timeout);
 }