y2038: Use a common definition for shmid_ds

Instead of replicate the same definitions from struct_shmid64_ds.h
on the multiple struct_shmid_ds.h, use a common header which is included
when required (struct_shmid64_ds_helper.h).

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

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

3 files changed, 36 insertions, 11 deletions

diff --git a/sysdeps/unix/sysv/linux/bits/types/struct_shmid64_ds.h b/sysdeps/unix/sysv/linux/bits/types/struct_shmid64_ds.h
index 71100db1b5..a4af8cc5f4 100644
--- a/sysdeps/unix/sysv/linux/bits/types/struct_shmid64_ds.h
+++ b/sysdeps/unix/sysv/linux/bits/types/struct_shmid64_ds.h
@@ -25,13 +25,6 @@
 #else
 struct __shmid64_ds
 {
-  struct ipc_perm shm_perm;	/* operation permission struct */
-  size_t shm_segsz;		/* size of segment in bytes */
-  __time64_t shm_atime;		/* time of last shmat() */
-  __time64_t shm_dtime;		/* time of last shmdt() */
-  __time64_t shm_ctime;		/* time of last change by shmctl() */
-  __pid_t shm_cpid;		/* pid of creator */
-  __pid_t shm_lpid;		/* pid of last shmop */
-  shmatt_t shm_nattch;		/* number of current attaches */
+# include <bits/types/struct_shmid64_ds_helper.h>
 };
 #endif
diff --git a/sysdeps/unix/sysv/linux/bits/types/struct_shmid64_ds_helper.h b/sysdeps/unix/sysv/linux/bits/types/struct_shmid64_ds_helper.h
new file mode 100644
index 0000000000..945e7ce63e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/types/struct_shmid64_ds_helper.h
@@ -0,0 +1,28 @@
+/* Common definitions for struct semid_ds with 64-bit time.
+   Copyright (C) 2020-2021 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/>.  */
+
+  struct ipc_perm shm_perm;	/* operation permission struct */
+  size_t shm_segsz;		/* size of segment in bytes */
+  __time64_t shm_atime;		/* time of last shmat() */
+  __time64_t shm_dtime;		/* time of last shmdt() */
+  __time64_t shm_ctime;		/* time of last change by shmctl() */
+  __pid_t shm_cpid;		/* pid of creator */
+  __pid_t shm_lpid;		/* pid of last shmop */
+  shmatt_t shm_nattch;		/* number of current attaches */
+  unsigned long int __glibc_reserved5;
+  unsigned long int __glibc_reserved6;
diff --git a/sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h b/sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h
index 2bd587d2b0..5f8ac6257b 100644
--- a/sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h
+++ b/sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h
@@ -23,23 +23,27 @@
 /* Data structure describing a shared memory segment.  */
 struct shmid_ds
   {
+#ifdef __USE_TIME_BITS64
+# include <bits/types/struct_shmid64_ds_helper.h>
+#else
     struct ipc_perm shm_perm;		/* operation permission struct */
     size_t shm_segsz;			/* size of segment in bytes */
-#if __TIMESIZE == 32
+# if __TIMESIZE == 32
     __time_t shm_atime;			/* time of last shmat() */
     unsigned long int __shm_atime_high;
     __time_t shm_dtime;			/* time of last shmdt() */
     unsigned long int __shm_dtime_high;
     __time_t shm_ctime;			/* time of last change by shmctl() */
     unsigned long int __shm_ctime_high;
-#else
+# else
     __time_t shm_atime;			/* time of last shmat() */
     __time_t shm_dtime;			/* time of last shmdt() */
     __time_t shm_ctime;			/* time of last change by shmctl() */
-#endif
+# 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;
+#endif
   };