0001-More-thorough-use-of-PGShmemHeader-instead-of-void.patch.nocfbot

From 78562cb315da1cc5b35c07aba5a3fd7faacdad48 Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <peter@eisentraut.org>
Date: Tue, 19 Nov 2024 13:15:15 +0100
Subject: [PATCH] More thorough use of PGShmemHeader * instead of void *

---
 src/backend/port/sysv_shmem.c           |  4 ++--
 src/backend/port/win32_shmem.c          |  4 ++--
 src/backend/postmaster/launch_backend.c |  2 +-
 src/backend/storage/ipc/shmem.c         | 13 ++++---------
 src/include/storage/pg_shmem.h          |  2 +-
 src/include/storage/shmem.h             |  3 ++-
 6 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/src/backend/port/sysv_shmem.c b/src/backend/port/sysv_shmem.c
index 362a37d3b3a..fa6ee15ce56 100644
--- a/src/backend/port/sysv_shmem.c
+++ b/src/backend/port/sysv_shmem.c
@@ -92,7 +92,7 @@ typedef enum
 
 
 unsigned long UsedShmemSegID = 0;
-void	   *UsedShmemSegAddr = NULL;
+PGShmemHeader *UsedShmemSegAddr = NULL;
 
 static Size AnonymousShmemSize;
 static void *AnonymousShmem = NULL;
@@ -892,7 +892,7 @@ PGSharedMemoryReAttach(void)
 	IpcMemoryId shmid;
 	PGShmemHeader *hdr;
 	IpcMemoryState state;
-	void	   *origUsedShmemSegAddr = UsedShmemSegAddr;
+	PGShmemHeader *origUsedShmemSegAddr = UsedShmemSegAddr;
 
 	Assert(UsedShmemSegAddr != NULL);
 	Assert(IsUnderPostmaster);
diff --git a/src/backend/port/win32_shmem.c b/src/backend/port/win32_shmem.c
index 3bcce9d3b63..827f9cd79b4 100644
--- a/src/backend/port/win32_shmem.c
+++ b/src/backend/port/win32_shmem.c
@@ -42,7 +42,7 @@
 void	   *ShmemProtectiveRegion = NULL;
 
 HANDLE		UsedShmemSegID = INVALID_HANDLE_VALUE;
-void	   *UsedShmemSegAddr = NULL;
+PGShmemHeader *UsedShmemSegAddr = NULL;
 static Size UsedShmemSegSize = 0;
 
 static bool EnableLockPagesPrivilege(int elevel);
@@ -424,7 +424,7 @@ void
 PGSharedMemoryReAttach(void)
 {
 	PGShmemHeader *hdr;
-	void	   *origUsedShmemSegAddr = UsedShmemSegAddr;
+	PGShmemHeader *origUsedShmemSegAddr = UsedShmemSegAddr;
 
 	Assert(ShmemProtectiveRegion != NULL);
 	Assert(UsedShmemSegAddr != NULL);
diff --git a/src/backend/postmaster/launch_backend.c b/src/backend/postmaster/launch_backend.c
index 1f2d829ec5a..8f48c938968 100644
--- a/src/backend/postmaster/launch_backend.c
+++ b/src/backend/postmaster/launch_backend.c
@@ -94,7 +94,7 @@ typedef struct
 	void	   *ShmemProtectiveRegion;
 	HANDLE		UsedShmemSegID;
 #endif
-	void	   *UsedShmemSegAddr;
+	PGShmemHeader *UsedShmemSegAddr;
 	slock_t    *ShmemLock;
 #ifdef USE_INJECTION_POINTS
 	struct InjectionPointsCtl *ActiveInjectionPoints;
diff --git a/src/backend/storage/ipc/shmem.c b/src/backend/storage/ipc/shmem.c
index 6d5f0839864..50f987ae240 100644
--- a/src/backend/storage/ipc/shmem.c
+++ b/src/backend/storage/ipc/shmem.c
@@ -92,18 +92,13 @@ static HTAB *ShmemIndex = NULL; /* primary index hashtable for shmem */
 
 /*
  *	InitShmemAccess() --- set up basic pointers to shared memory.
- *
- * Note: the argument should be declared "PGShmemHeader *seghdr",
- * but we use void to avoid having to include ipc.h in shmem.h.
  */
 void
-InitShmemAccess(void *seghdr)
+InitShmemAccess(PGShmemHeader *seghdr)
 {
-	PGShmemHeader *shmhdr = (PGShmemHeader *) seghdr;
-
-	ShmemSegHdr = shmhdr;
-	ShmemBase = (void *) shmhdr;
-	ShmemEnd = (char *) ShmemBase + shmhdr->totalsize;
+	ShmemSegHdr = seghdr;
+	ShmemBase = seghdr;
+	ShmemEnd = (char *) ShmemBase + seghdr->totalsize;
 }
 
 /*
diff --git a/src/include/storage/pg_shmem.h b/src/include/storage/pg_shmem.h
index 3065ff5be71..7a07c5807ac 100644
--- a/src/include/storage/pg_shmem.h
+++ b/src/include/storage/pg_shmem.h
@@ -69,7 +69,7 @@ extern PGDLLIMPORT unsigned long UsedShmemSegID;
 extern PGDLLIMPORT HANDLE UsedShmemSegID;
 extern PGDLLIMPORT void *ShmemProtectiveRegion;
 #endif
-extern PGDLLIMPORT void *UsedShmemSegAddr;
+extern PGDLLIMPORT PGShmemHeader *UsedShmemSegAddr;
 
 #if !defined(WIN32) && !defined(EXEC_BACKEND)
 #define DEFAULT_SHARED_MEMORY_TYPE SHMEM_TYPE_MMAP
diff --git a/src/include/storage/shmem.h b/src/include/storage/shmem.h
index 842989111c3..8cdbe7a89c8 100644
--- a/src/include/storage/shmem.h
+++ b/src/include/storage/shmem.h
@@ -27,7 +27,8 @@
 
 /* shmem.c */
 extern PGDLLIMPORT slock_t *ShmemLock;
-extern void InitShmemAccess(void *seghdr);
+struct PGShmemHeader;			/* avoid including storage/pg_shmem.h here */
+extern void InitShmemAccess(struct PGShmemHeader *seghdr);
 extern void InitShmemAllocation(void);
 extern void *ShmemAlloc(Size size);
 extern void *ShmemAllocNoError(Size size);
-- 
2.47.0