sysvipc: Split out linux struct shmid_ds

This will allow us to have architectures specify their own version.

Not semantic changes expected.  Checked with a build against the
all affected ABIs.

3 files changed, 59 insertions, 33 deletions

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index f15392b499..a8f171bdc5 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -93,6 +93,7 @@ sysdep_headers += sys/mount.h sys/acct.h \
 		  bits/termios-misc.h \
 		  bits/types/struct_semid_ds.h \
 		  bits/types/struct_msqid_ds.h \
+		  bits/types/struct_shmid_ds.h \
 		  bits/ipc-perm.h \
 		  sys/rseq.h bits/rseq.h
 
diff --git a/sysdeps/unix/sysv/linux/bits/shm.h b/sysdeps/unix/sysv/linux/bits/shm.h
index 113c05ee89..9ef6aeaf92 100644
--- a/sysdeps/unix/sysv/linux/bits/shm.h
+++ b/sysdeps/unix/sysv/linux/bits/shm.h
@@ -43,39 +43,7 @@ __BEGIN_DECLS
 /* Type to count number of attaches.  */
 typedef __syscall_ulong_t shmatt_t;
 
-#if __SHM_PAD_BEFORE_TIME
-# define __SHM_PAD_TIME(NAME, RES)				\
-  unsigned long int __glibc_reserved ## RES; __time_t NAME
-#elif __SHM_PAD_AFTER_TIME
-# define __SHM_PAD_TIME(NAME, RES)				\
-  __time_t NAME; unsigned long int __glibc_reserved ## RES
-#else
-# define __SHM_PAD_TIME(NAME, RES)		\
-  __time_t NAME
-#endif
-
-/* Data structure describing a shared memory segment.  */
-struct shmid_ds
-  {
-    struct ipc_perm shm_perm;		/* operation permission struct */
-#if !__SHM_SEGSZ_AFTER_TIME
-    size_t shm_segsz;			/* size of segment in bytes */
-#endif
-    __SHM_PAD_TIME (shm_atime, 1);	/* time of last shmat() */
-    __SHM_PAD_TIME (shm_dtime, 2);	/* time of last shmdt() */
-    __SHM_PAD_TIME (shm_ctime, 3);	/* time of last change by shmctl() */
-#if __SHM_PAD_BETWEEN_TIME_AND_SEGSZ
-    unsigned long int __glibc_reserved4;
-#endif
-#if __SHM_SEGSZ_AFTER_TIME
-    size_t shm_segsz;			/* size of segment in bytes */
-#endif
-    __pid_t shm_cpid;			/* pid of creator */
-    __pid_t shm_lpid;			/* pid of last shmop */
-    shmatt_t shm_nattch;		/* number of current attaches */
-    __syscall_ulong_t __glibc_reserved5;
-    __syscall_ulong_t __glibc_reserved6;
-  };
+#include <bits/types/struct_shmid_ds.h>
 
 #ifdef __USE_MISC
 
diff --git a/sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h b/sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h
new file mode 100644
index 0000000000..938bbedfcd
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h
@@ -0,0 +1,57 @@
+/* Generic implementation of the shared memory struct shmid_ds.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#ifndef _SYS_SHM_H
+# error "Never include <bits/types/struct_shmid_ds.h> directly; use <sys/shm.h> instead."
+#endif
+
+#include <bits/shm-pad.h>
+
+#if __SHM_PAD_BEFORE_TIME
+# define __SHM_PAD_TIME(NAME, RES)				\
+  unsigned long int __glibc_reserved ## RES; __time_t NAME
+#elif __SHM_PAD_AFTER_TIME
+# define __SHM_PAD_TIME(NAME, RES)				\
+  __time_t NAME; unsigned long int __glibc_reserved ## RES
+#else
+# define __SHM_PAD_TIME(NAME, RES)		\
+  __time_t NAME
+#endif
+
+/* Data structure describing a shared memory segment.  */
+struct shmid_ds
+  {
+    struct ipc_perm shm_perm;		/* operation permission struct */
+#if !__SHM_SEGSZ_AFTER_TIME
+    size_t shm_segsz;			/* size of segment in bytes */
+#endif
+    __SHM_PAD_TIME (shm_atime, 1);	/* time of last shmat() */
+    __SHM_PAD_TIME (shm_dtime, 2);	/* time of last shmdt() */
+    __SHM_PAD_TIME (shm_ctime, 3);	/* time of last change by shmctl() */
+#if __SHM_PAD_BETWEEN_TIME_AND_SEGSZ
+    unsigned long int __glibc_reserved4;
+#endif
+#if __SHM_SEGSZ_AFTER_TIME
+    size_t shm_segsz;			/* size of segment in bytes */
+#endif
+    __pid_t shm_cpid;			/* pid of creator */
+    __pid_t shm_lpid;			/* pid of last shmop */
+    shmatt_t shm_nattch;		/* number of current attaches */
+    __syscall_ulong_t __glibc_reserved5;
+    __syscall_ulong_t __glibc_reserved6;
+  };