y2038: Use a common definition for msqid_ds

Instead of replicate the same definitions from struct_msqid64_ds.h
on the multiple struct_msqid_ds.h, use a common header which is included
when required (struct_msqid64_ds_helper.h).

The __USE_TIME_BITS64 is not defined internally yet, although the
internal header is used when building the 64-bit stat implementations.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>

3 files changed, 40 insertions, 12 deletions

diff --git a/sysdeps/unix/sysv/linux/bits/types/struct_msqid64_ds.h b/sysdeps/unix/sysv/linux/bits/types/struct_msqid64_ds.h
index 43e8cd7cfc..992734914a 100644
--- a/sysdeps/unix/sysv/linux/bits/types/struct_msqid64_ds.h
+++ b/sysdeps/unix/sysv/linux/bits/types/struct_msqid64_ds.h
@@ -25,14 +25,6 @@
 #else
 struct __msqid64_ds
 {
-  struct ipc_perm msg_perm;	/* structure describing operation permission */
-  __time64_t msg_stime;		/* time of last msgsnd command */
-  __time64_t msg_rtime;		/* time of last msgsnd command */
-  __time64_t msg_ctime;		/* 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() */
+# include <bits/types/struct_msqid64_ds_helper.h>
 };
 #endif
diff --git a/sysdeps/unix/sysv/linux/bits/types/struct_msqid64_ds_helper.h b/sysdeps/unix/sysv/linux/bits/types/struct_msqid64_ds_helper.h
new file mode 100644
index 0000000000..58da9f223b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/types/struct_msqid64_ds_helper.h
@@ -0,0 +1,30 @@
+/* Common definitions for struct msqid_ds with 64-bit time.
+   Copyright (C) 2021 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/>.  */
+
+  /* Content of internal __msqid64_ds.  */
+  struct ipc_perm msg_perm;	/* structure describing operation permission */
+  __time64_t msg_stime;		/* time of last msgsnd command */
+  __time64_t msg_rtime;		/* time of last msgsnd command */
+  __time64_t msg_ctime;		/* 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() */
+  unsigned long int __glibc_reserved4;
+  unsigned long int __glibc_reserved5;
diff --git a/sysdeps/unix/sysv/linux/bits/types/struct_msqid_ds.h b/sysdeps/unix/sysv/linux/bits/types/struct_msqid_ds.h
index 1ed041ae30..ae10a48452 100644
--- a/sysdeps/unix/sysv/linux/bits/types/struct_msqid_ds.h
+++ b/sysdeps/unix/sysv/linux/bits/types/struct_msqid_ds.h
@@ -20,23 +20,28 @@
 # error "Never use <bits/msq.h> directly; include <sys/msg.h> instead."
 #endif
 
+#include <bits/types/time_t.h>
+
 /* Structure of record for one message inside the kernel.
    The type `struct msg' is opaque.  */
 struct msqid_ds
 {
+#ifdef __USE_TIME_BITS64
+# include <bits/types/struct_msqid64_ds_helper.h>
+#else
   struct ipc_perm msg_perm;	/* structure describing operation permission */
-#if __TIMESIZE == 32
+# if __TIMESIZE == 32
   __time_t msg_stime;		/* time of last msgsnd command */
   unsigned long int __msg_stime_high;
   __time_t msg_rtime;		/* time of last msgsnd command */
   unsigned long int __msg_rtime_high;
   __time_t msg_ctime;		/* time of last change */
   unsigned long int __msg_ctime_high;
-#else
+# else
   __time_t msg_stime;		/* time of last msgsnd command */
   __time_t msg_rtime;		/* time of last msgsnd command */
   __time_t msg_ctime;		/* time of last change */
-#endif
+# endif
   __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 */
@@ -44,4 +49,5 @@ struct msqid_ds
   __pid_t msg_lrpid;		/* pid of last msgrcv() */
   __syscall_ulong_t __glibc_reserved4;
   __syscall_ulong_t __glibc_reserved5;
+#endif
 };