[compiler-rt] [compiler-rt] intercept macos fpurge (PR #121669)

[David CARLIER via llvm-commits]

https://github.com/devnexen created https://github.com/llvm/llvm-project/pull/121669

None

>From 139845ced2d266fb5ae625088bc30b8bb8d6dd71 Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen at gmail.com>
Date: Sat, 4 Jan 2025 22:40:20 +0000
Subject: [PATCH] [compiler-rt] intercept macos fpurge

---
 .../sanitizer_common_interceptors.inc             | 15 +++++++++++++++
 .../sanitizer_platform_interceptors.h             |  1 +
 2 files changed, 16 insertions(+)

diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
index 24a8a2d4dc55b4..d58ec9f4b6ac03 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -10263,6 +10263,21 @@ INTERCEPTOR(SSIZE_T, freadlink, int fd, char *buf, SIZE_T bufsiz) {
 #  define INIT_FREADLINK
 #endif
 
+#if SANITIZER_INTERCEPT_FPURGE
+INTERCEPTOR(int, fpurge, __sanitizer_FILE *fp) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, fflush, fp);
+  if (fp)
+    unpoison_file(fp);
+  int res = REAL(fpurge)(fp);
+  if (fp) {
+    const FileMetadata *m = GetInterceptorMetadata(fp);
+    if (m) COMMON_INTERCEPTOR_INITIALIZE_RANGE(*m->addr, *m->size);
+  }
+  return res;
+}
+#endif
+
 #include "sanitizer_common_interceptors_netbsd_compat.inc"
 
 namespace __sanitizer {
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h b/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
index 190cad7cf7c3f7..24ff4ad38e4742 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
@@ -640,6 +640,7 @@ SANITIZER_WEAK_IMPORT void *aligned_alloc(__sanitizer::usize __alignment,
 #  define SI_MAC_OS_DEPLOYMENT_MIN_13_00 0
 #endif
 #define SANITIZER_INTERCEPT_FREADLINK (SI_MAC && SI_MAC_OS_DEPLOYMENT_MIN_13_00)
+#define SANITIZER_INTERCEPT_FPURGE SI_MAC
 // This macro gives a way for downstream users to override the above
 // interceptor macros irrespective of the platform they are on. They have
 // to do two things: