[glibc/vineet/arc-port-latest] sysvipc: Split out linux struct semid_ds

[Vineet Gupta]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3721447c84e4a500c5af87f9048a9de6b4fe4964

commit 3721447c84e4a500c5af87f9048a9de6b4fe4964
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Mon Jun 29 18:21:14 2020 -0300

    sysvipc: Split out linux struct semid_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.

Diff:
---
 sysdeps/unix/sysv/linux/Makefile                   |  1 +
 sysdeps/unix/sysv/linux/bits/msq.h                 | 39 +++--------------
 .../unix/sysv/linux/bits/types/struct_msqid_ds.h   | 51 ++++++++++++++++++++++
 3 files changed, 58 insertions(+), 33 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index e02065dc8d..70e2d9e044 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -92,6 +92,7 @@ sysdep_headers += sys/mount.h sys/acct.h \
 		  bits/termios-c_lflag.h bits/termios-tcflow.h \
 		  bits/termios-misc.h \
 		  bits/types/struct_semid_ds.h \
+		  bits/types/struct_msqid_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/msq.h b/sysdeps/unix/sysv/linux/bits/msq.h
index cc4ebae0f0..6ce6408ebc 100644
--- a/sysdeps/unix/sysv/linux/bits/msq.h
+++ b/sysdeps/unix/sysv/linux/bits/msq.h
@@ -20,7 +20,12 @@
 #endif
 
 #include <bits/types.h>
-#include <bits/msq-pad.h>
+
+/* Types used in the MSQID_DS structure definition.  */
+typedef __syscall_ulong_t msgqnum_t;
+typedef __syscall_ulong_t msglen_t;
+
+#include <bits/types/struct_msqid_ds.h>
 
 /* Define options for message queue functions.  */
 #define MSG_NOERROR	010000	/* no error if message is too big */
@@ -29,38 +34,6 @@
 # define MSG_COPY	040000	/* copy (not remove) all queue messages */
 #endif
 
-/* Types used in the structure definition.  */
-typedef __syscall_ulong_t msgqnum_t;
-typedef __syscall_ulong_t msglen_t;
-
-#if __MSQ_PAD_BEFORE_TIME
-# define __MSQ_PAD_TIME(NAME, RES)				\
-  unsigned long int __glibc_reserved ## RES; __time_t NAME
-#elif __MSQ_PAD_AFTER_TIME
-# define __MSQ_PAD_TIME(NAME, RES)				\
-  __time_t NAME; unsigned long int __glibc_reserved ## RES
-#else
-# define __MSQ_PAD_TIME(NAME, RES)		\
-  __time_t NAME
-#endif
-
-/* Structure of record for one message inside the kernel.
-   The type `struct msg' is opaque.  */
-struct msqid_ds
-{
-  struct ipc_perm msg_perm;	/* structure describing operation permission */
-  __MSQ_PAD_TIME (msg_stime, 1);	/* time of last msgsnd command */
-  __MSQ_PAD_TIME (msg_rtime, 2);	/* time of last msgrcv command */
-  __MSQ_PAD_TIME (msg_ctime, 3);	/* time of last change */
-  __syscall_ulong_t __msg_cbytes; /* current number of bytes on queue */
-  msgqnum_t msg_qnum;		/* number of messages currently on queue */
-  msglen_t msg_qbytes;		/* max number of bytes allowed on queue */
-  __pid_t msg_lspid;		/* pid of last msgsnd() */
-  __pid_t msg_lrpid;		/* pid of last msgrcv() */
-  __syscall_ulong_t __glibc_reserved4;
-  __syscall_ulong_t __glibc_reserved5;
-};
-
 #ifdef __USE_MISC
 
 # define msg_cbytes	__msg_cbytes
diff --git a/sysdeps/unix/sysv/linux/bits/types/struct_msqid_ds.h b/sysdeps/unix/sysv/linux/bits/types/struct_msqid_ds.h
new file mode 100644
index 0000000000..bfc56f6ac1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/types/struct_msqid_ds.h
@@ -0,0 +1,51 @@
+/* Generic implementation of the SysV message struct msqid_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_MSG_H
+# error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
+#endif
+
+#include <bits/msq-pad.h>
+
+#if __MSQ_PAD_BEFORE_TIME
+# define __MSQ_PAD_TIME(NAME, RES)				\
+  unsigned long int __glibc_reserved ## RES; __time_t NAME
+#elif __MSQ_PAD_AFTER_TIME
+# define __MSQ_PAD_TIME(NAME, RES)				\
+  __time_t NAME; unsigned long int __glibc_reserved ## RES
+#else
+# define __MSQ_PAD_TIME(NAME, RES)		\
+  __time_t NAME
+#endif
+
+/* Structure of record for one message inside the kernel.
+   The type `struct msg' is opaque.  */
+struct msqid_ds
+{
+  struct ipc_perm msg_perm;	/* structure describing operation permission */
+  __MSQ_PAD_TIME (msg_stime, 1);	/* time of last msgsnd command */
+  __MSQ_PAD_TIME (msg_rtime, 2);	/* time of last msgrcv command */
+  __MSQ_PAD_TIME (msg_ctime, 3);	/* time of last change */
+  __syscall_ulong_t __msg_cbytes; /* current number of bytes on queue */
+  msgqnum_t msg_qnum;		/* number of messages currently on queue */
+  msglen_t msg_qbytes;		/* max number of bytes allowed on queue */
+  __pid_t msg_lspid;		/* pid of last msgsnd() */
+  __pid_t msg_lrpid;		/* pid of last msgrcv() */
+  __syscall_ulong_t __glibc_reserved4;
+  __syscall_ulong_t __glibc_reserved5;
+};