[glibc] bits/sem.h: Split out struct semid_ds

[glibc] bits/sem.h: Split out struct semid_ds

[Alistair Francis]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=246a53d3c6aeb4ab03b5dc83144207bc6a916011

commit 246a53d3c6aeb4ab03b5dc83144207bc6a916011
Author: Alistair Francis <alistair.francis@wdc.com>
Date:   Tue Feb 25 14:52:27 2020 -0800

    bits/sem.h: Split out struct semid_ds
    
    Split out the struct semid_ds into it's own file. This will allow us to
    have architectures specify their own version.
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 sysdeps/unix/sysv/linux/Makefile                   |  1 +
 sysdeps/unix/sysv/linux/bits/sem.h                 | 24 +-----------
 .../unix/sysv/linux/bits/types/struct_semid_ds.h   | 43 ++++++++++++++++++++++
 3 files changed, 45 insertions(+), 23 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index 089a4899d5..db35c29351 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -90,6 +90,7 @@ sysdep_headers += sys/mount.h sys/acct.h \
 		  bits/termios-baud.h bits/termios-c_cflag.h \
 		  bits/termios-c_lflag.h bits/termios-tcflow.h \
 		  bits/termios-misc.h \
+		  bits/types/struct_semid_ds.h \
 		  bits/ipc-perm.h
 
 tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
diff --git a/sysdeps/unix/sysv/linux/bits/sem.h b/sysdeps/unix/sysv/linux/bits/sem.h
index e0f4155c67..0d1813ec67 100644
--- a/sysdeps/unix/sysv/linux/bits/sem.h
+++ b/sysdeps/unix/sysv/linux/bits/sem.h
@@ -21,6 +21,7 @@
 
 #include <sys/types.h>
 #include <bits/sem-pad.h>
+#include <bits/types/struct_semid_ds.h>
 
 /* Flags for `semop'.  */
 #define SEM_UNDO	0x1000		/* undo the operation on exit */
@@ -34,29 +35,6 @@
 #define SETVAL		16		/* set semval */
 #define SETALL		17		/* set all semval's */
 
-
-#if __SEM_PAD_BEFORE_TIME
-# define __SEM_PAD_TIME(NAME, RES)				\
-  __syscall_ulong_t __glibc_reserved ## RES; __time_t NAME
-#elif __SEM_PAD_AFTER_TIME
-# define __SEM_PAD_TIME(NAME, RES)				\
-  __time_t NAME; __syscall_ulong_t __glibc_reserved ## RES
-#else
-# define __SEM_PAD_TIME(NAME, RES)		\
-  __time_t NAME
-#endif
-
-/* Data structure describing a set of semaphores.  */
-struct semid_ds
-{
-  struct ipc_perm sem_perm;		/* operation permission struct */
-  __SEM_PAD_TIME (sem_otime, 1);	/* last semop() time */
-  __SEM_PAD_TIME (sem_ctime, 2);	/* last time changed by semctl() */
-  __syscall_ulong_t sem_nsems;		/* number of semaphores in set */
-  __syscall_ulong_t __glibc_reserved3;
-  __syscall_ulong_t __glibc_reserved4;
-};
-
 /* The user should define a union like the following to use it for arguments
    for `semctl'.
 
diff --git a/sysdeps/unix/sysv/linux/bits/types/struct_semid_ds.h b/sysdeps/unix/sysv/linux/bits/types/struct_semid_ds.h
new file mode 100644
index 0000000000..0e136961d5
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/types/struct_semid_ds.h
@@ -0,0 +1,43 @@
+/* Generic implementation of the semaphore struct semid_ds.
+   Copyright (C) 1995-2020 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_SEM_H
+# error "Never include <bits/types/struct_semid_ds.h> directly; use <sys/sem.h> instead."
+#endif
+
+#if __SEM_PAD_BEFORE_TIME
+# define __SEM_PAD_TIME(NAME, RES)        \
+  __syscall_ulong_t __glibc_reserved ## RES; __time_t NAME
+#elif __SEM_PAD_AFTER_TIME
+# define __SEM_PAD_TIME(NAME, RES)        \
+  __time_t NAME; __syscall_ulong_t __glibc_reserved ## RES
+#else
+# define __SEM_PAD_TIME(NAME, RES)    \
+  __time_t NAME
+#endif
+
+/* Data structure describing a set of semaphores.  */
+struct semid_ds
+{
+  struct ipc_perm sem_perm;		/* operation permission struct */
+  __SEM_PAD_TIME (sem_otime, 1);	/* last semop() time */
+  __SEM_PAD_TIME (sem_ctime, 2);	/* last time changed by semctl() */
+  __syscall_ulong_t sem_nsems;		/* number of semaphores in set */
+  __syscall_ulong_t __glibc_reserved3;
+  __syscall_ulong_t __glibc_reserved4;
+};