sysv: linux: Add 64-bit time_t variant for semctl

Different than others 64-bit time_t syscalls, the SysIPC interface
does not provide a new set of syscall for y2038 safeness.  Instead it
uses unused fields in semid_ds structure to return the high bits for
the timestamps.

To provide a y2038 safe interface a new symbol __semctl64 is added
and __semctl is change to call it instead (it adds some extra buffer
copying for the 32 bit time_t implementation).

Two new structures are added:

  1. kernel_semid64_ds: used internally only on 32-bit architectures
     to issue the syscall.  A handful of architectures (hppa, i386,
     mips, powerpc32, sparc32) require specific implementations due
     their kernel ABI.

  2. semid_ds64: this is only for __TIMESIZE != 64 to use along with
     the 64-bit semctl.  It is different than the kernel struct because
     the exported 64-bit time_t might require different alignment
     depending on the architecture ABI.

So the resulting implementation does:

  1. For 64-bit architectures it assumes semid_ds already contains
     64-bit time_t fields and will result in just the __semctl symbol
     using the __semctl64 code.  The semid_ds argument is passed as-is
     to the syscall.

  2. For 32-bit architectures with default 64-bit time_t (newer ABIs
     such riscv32 or arc), it will also result in only one exported
     symbol but with the required high/low handling.

     It might be possible to optimize it further to avoid the
     kernel_semid64_ds to semun transformation if the exported ABI
     for the architectures matches the expected kernel ABI, but the
     implementation is already complex enough and don't think this
     should be a hotspot in any case.

  3. Finally for 32-bit architecture with both 32-bit and 64-bit time_t
     support we follow the already set way to provide one symbol with
     64-bit time_t support and implement the 32-bit time_t support
     using the 64-bit one.

     The default 32-bit symbol will allocate and copy the semid_ds
     over multiple buffers, but this should be deprecated in favor
     of the __semctl64 anyway.

Checked on i686-linux-gnu and x86_64-linux-gnu.  I also did some sniff
tests on powerpc, powerpc64, mips, mips64, armhf, sparcv9, and
sparc64.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Tested-by: Alistair Francis <alistair.francis@wdc.com>
Tested-by: Vineet Gupta <vgupta@synopsys.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>

include/sys/sem.h

@@ -1,9 +1 @@
-#ifndef _SYS_SEM_H
-# include <sysvipc/sys/sem.h>
-
-# ifndef _ISOMAC
-
-__typeof__ (semtimedop) __semtimedop attribute_hidden;
-
-# endif
-#endif
+#include_next <sys/sem.h>

sysdeps/unix/sysv/linux/bits/types/struct_semid64_ds.h

@@ -0,0 +1,33 @@
+/* Generic implementation of the semaphore struct semid64_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_SEM_H
+# error "Never include <bits/types/struct_semid_ds.h> directly; use <sys/sem.h> instead."
+#endif
+
+#if __TIMESIZE == 64
+# define __semid64_ds semid_ds
+#else
+struct __semid64_ds
+{
+  struct ipc_perm sem_perm;		/* operation permission struct */
+  __time64_t sem_otime;			/* last semop() time */
+  __time64_t sem_ctime;			/* last time changed by semctl() */
+  __syscall_ulong_t sem_nsems;		/* number of semaphores in set */
+};
+#endif

sysdeps/unix/sysv/linux/bits/types/struct_semid_ds.h

@@ -21,26 +21,19 @@
 #endif
 
 /* Data structure describing a set of semaphores.  */
-#if __TIMESIZE == 32
 struct semid_ds
 {
   struct ipc_perm sem_perm;        /* operation permission struct */
+#if __TIMESIZE == 32
   __time_t sem_otime;              /* last semop() time */
-  __syscall_ulong_t __glibc_reserved1;
+  __syscall_ulong_t __sem_otime_high;
   __time_t sem_ctime;             /* last time changed by semctl() */
-  __syscall_ulong_t __glibc_reserved2;
+  __syscall_ulong_t __sem_ctime_high;
+#else
+  __time_t sem_otime;
+  __time_t sem_ctime;
+#endif
   __syscall_ulong_t sem_nsems;    /* number of semaphores in set */
   __syscall_ulong_t __glibc_reserved3;
   __syscall_ulong_t __glibc_reserved4;
 };
-#else
-struct semid_ds
-{
-  struct ipc_perm sem_perm;		/* operation permission struct */
-  __time_t sem_otime;			/* last semop() time */
-  __time_t sem_ctime;			/* 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;
-};
-#endif

sysdeps/unix/sysv/linux/hppa/bits/types/struct_semid_ds.h

@@ -21,16 +21,14 @@
 #endif
 
 /* Data structure describing a set of semaphores.  */
-#if __TIMESIZE == 32
 struct semid_ds
 {
   struct ipc_perm sem_perm;   /* operation permission struct */
-  __syscall_ulong_t __glibc_reserved1;
+  __syscall_ulong_t __sem_otime_high;
   __time_t sem_otime;         /* last semop() time */
-  __syscall_ulong_t __glibc_reserved2;
+  __syscall_ulong_t __sem_ctime_high;
   __time_t sem_ctime;         /* 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;
 };
-#endif

sysdeps/unix/sysv/linux/hppa/struct_kernel_semid64_ds.h

@@ -0,0 +1,12 @@
+/* Analogous to kernel struct semid64_ds used on semctl.  */
+struct kernel_semid64_ds
+{
+  struct ipc_perm sem_perm;
+  unsigned long sem_otime_high;
+  unsigned long sem_otime;
+  unsigned long sem_ctime_high;
+  unsigned long sem_ctime;
+  unsigned long sem_nsems;
+  unsigned long __ununsed1;
+  unsigned long __ununsed2;
+};

sysdeps/unix/sysv/linux/i386/struct_kernel_semid64_ds.h

@@ -0,0 +1,12 @@
+/* Analogous to kernel struct semid64_ds used on semctl.  */
+struct kernel_semid64_ds
+{
+  struct ipc_perm sem_perm;
+  unsigned long sem_otime;
+  unsigned long sem_otime_high;
+  unsigned long sem_ctime;
+  unsigned long sem_ctime_high;
+  __syscall_ulong_t sem_nsems;
+  __syscall_ulong_t __unused3;
+  __syscall_ulong_t __unused4;
+};

sysdeps/unix/sysv/linux/include/sys/sem.h

@@ -0,0 +1,16 @@
+#ifndef _SYS_SEM_H
+# include <sysvipc/sys/sem.h>
+
+# ifndef _ISOMAC
+
+__typeof__ (semtimedop) __semtimedop attribute_hidden;
+
+#if __TIMESIZE == 64
+# define __semctl64 __semctl
+#else
+extern int __semctl64 (int semid, int semnum, int cmd, ...);
+libc_hidden_proto (__semctl64);
+#endif
+
+# endif
+#endif

sysdeps/unix/sysv/linux/ipc_priv.h

@@ -53,4 +53,14 @@ struct __old_ipc_perm
 #define SEMTIMEDOP_IPC_ARGS(__nsops, __sops, __timeout) \
   (__nsops), 0, (__sops), (__timeout)
 
+/* Linux SysV ipc does not provide new syscalls for 64-bit time support on
+   32-bit architectures, but rather split the timestamp into high and low;
+   storing the high value in previously unused fields.  */
+#if (__WORDSIZE == 32 \
+     && (!defined __SYSCALL_WORDSIZE || __SYSCALL_WORDSIZE == 32))
+# define __IPC_TIME64 1
+#else
+# define __IPC_TIME64 0
+#endif
+
 #include <ipc_ops.h>

sysdeps/unix/sysv/linux/mips/bits/types/struct_semid_ds.h

@@ -27,6 +27,6 @@ struct semid_ds
   __time_t sem_otime;	/* last semop() time */
   __time_t sem_ctime;	/* 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;
+  __syscall_ulong_t __sem_otime_high;
+  __syscall_ulong_t __sem_ctime_high;
 };

sysdeps/unix/sysv/linux/mips/struct_kernel_semid64_ds.h

@@ -0,0 +1,10 @@
+/* Analogous to kernel struct semid64_ds used on semctl.  */
+struct kernel_semid64_ds
+{
+  struct ipc_perm sem_perm;
+  unsigned long sem_otime;
+  unsigned long sem_ctime;
+  unsigned long sem_nsems;
+  unsigned long sem_otime_high;
+  unsigned long sem_ctime_high;
+};

sysdeps/unix/sysv/linux/powerpc/bits/types/struct_semid_ds.h

@@ -25,9 +25,9 @@ struct semid_ds
 {
   struct ipc_perm sem_perm;   /* operation permission struct */
 #if __TIMESIZE == 32
-  __syscall_ulong_t __glibc_reserved1;
+  __syscall_ulong_t __sem_otime_high;
   __time_t sem_otime;         /* last semop() time */
-  __syscall_ulong_t __glibc_reserved2;
+  __syscall_ulong_t __sem_ctime_high;
   __time_t sem_ctime;        /* last time changed by semctl() */
 #else
   __time_t sem_otime;         /* last semop() time */

sysdeps/unix/sysv/linux/powerpc/powerpc32/struct_kernel_semid64_ds.h

@@ -0,0 +1,12 @@
+/* Analogous to kernel struct semid64_ds used on semctl.  */
+struct kernel_semid64_ds
+{
+  struct ipc_perm sem_perm;
+  unsigned long sem_otime_high;
+  unsigned long sem_otime;
+  unsigned long sem_ctime_high;
+  unsigned long sem_ctime;
+  unsigned long sem_nsems;
+  unsigned long __unused3;
+  unsigned long __unused4;
+};

sysdeps/unix/sysv/linux/semctl.c

@@ -21,10 +21,13 @@
 #include <ipc_priv.h>
 #include <sysdep.h>
 #include <shlib-compat.h>
-#include <errno.h>
-#include <linux/posix_types.h>  /* For __kernel_mode_t.  */
+#include <bits/types/struct_semid64_ds.h>  /* For __semid64_ds.  */
+#include <linux/posix_types.h>             /* For __kernel_mode_t.  */
 
-/* Define a `union semun' suitable for Linux here.  */
+/* The struct used to issue the syscall.  For architectures that assume
+   64-bit time as default (!__ASSUME_TIME64_SYSCALLS) the syscall will
+   split the resulting 64-bit sem_{o,c}time in two fields (sem_{o,c}time
+   and __sem_{o,c}time_high).  */
 union semun
 {
   int val;			/* value for SETVAL */
@@ -33,16 +36,90 @@ union semun
   struct seminfo *__buf;	/* buffer for IPC_INFO */
 };
 
-#ifndef DEFAULT_VERSION
-# ifndef __ASSUME_SYSVIPC_BROKEN_MODE_T
-#  define DEFAULT_VERSION GLIBC_2_2
+#if __IPC_TIME64 == 0
+# define semun64 semun
+typedef union semun semctl_arg_t;
+#else
+# include <struct_kernel_semid64_ds.h>
+
+union ksemun64
+{
+  int val;
+  struct kernel_semid64_ds *buf;
+  unsigned short int *array;
+  struct seminfo *__buf;
+};
+
+# if __TIMESIZE == 64
+#  define semun64 semun
 # else
-#  define DEFAULT_VERSION GLIBC_2_31
+/* The struct used when __semctl64 is called.  */
+union semun64
+{
+  int val;
+  struct __semid64_ds *buf;
+  unsigned short int *array;
+  struct seminfo *__buf;
+};
 # endif
+
+static void
+semid64_to_ksemid64 (const struct __semid64_ds *semid64,
+		     struct kernel_semid64_ds *ksemid)
+{
+  ksemid->sem_perm       = semid64->sem_perm;
+  ksemid->sem_otime      = semid64->sem_otime;
+  ksemid->sem_otime_high = semid64->sem_otime >> 32;
+  ksemid->sem_ctime      = semid64->sem_ctime;
+  ksemid->sem_ctime_high = semid64->sem_ctime >> 32;
+  ksemid->sem_nsems      = semid64->sem_nsems;
+}
+
+static void
+ksemid64_to_semid64 (const struct kernel_semid64_ds *ksemid,
+		     struct __semid64_ds *semid64)
+{
+  semid64->sem_perm  = ksemid->sem_perm;
+  semid64->sem_otime = ksemid->sem_otime
+		       | ((__time64_t) ksemid->sem_otime_high << 32);
+  semid64->sem_ctime = ksemid->sem_ctime
+		       | ((__time64_t) ksemid->sem_ctime_high << 32);
+  semid64->sem_nsems = ksemid->sem_nsems;
+}
+
+static union ksemun64
+semun64_to_ksemun64 (int cmd, union semun64 semun64,
+		     struct kernel_semid64_ds *buf)
+{
+  union ksemun64 r = { 0 };
+  switch (cmd)
+    {
+    case SETVAL:
+      r.val = semun64.val;
+      break;
+    case GETALL:
+    case SETALL:
+      r.array = semun64.array;
+      break;
+    case SEM_STAT:
+    case IPC_STAT:
+    case IPC_SET:
+      r.buf = buf;
+      semid64_to_ksemid64 (semun64.buf, r.buf);
+      break;
+    case IPC_INFO:
+    case SEM_INFO:
+      r.__buf = semun64.__buf;
+      break;
+    }
+  return r;
+}
+
+typedef union ksemun64 semctl_arg_t;
 #endif
 
 static int
-semctl_syscall (int semid, int semnum, int cmd, union semun arg)
+semctl_syscall (int semid, int semnum, int cmd, semctl_arg_t arg)
 {
 #ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
   return INLINE_SYSCALL_CALL (semctl, semid, semnum, cmd | __IPC_64,
@@ -53,15 +130,132 @@ semctl_syscall (int semid, int semnum, int cmd, union semun arg)
 #endif
 }
 
-int
-__new_semctl (int semid, int semnum, int cmd, ...)
-{
-  /* POSIX states ipc_perm mode should have type of mode_t.  */
-  _Static_assert (sizeof ((struct semid_ds){0}.sem_perm.mode)
-		  == sizeof (mode_t),
-		  "sizeof (msqid_ds.msg_perm.mode) != sizeof (mode_t)");
+/* POSIX states ipc_perm mode should have type of mode_t.  */
+_Static_assert (sizeof ((struct semid_ds){0}.sem_perm.mode)
+		== sizeof (mode_t),
+		"sizeof (msqid_ds.msg_perm.mode) != sizeof (mode_t)");
 
+int
+__semctl64 (int semid, int semnum, int cmd, ...)
+{
+  union semun64 arg64 = { 0 };
+  va_list ap;
+
+  /* Get the argument only if required.  */
+  switch (cmd)
+    {
+    case SETVAL:        /* arg.val */
+    case GETALL:        /* arg.array */
+    case SETALL:
+    case IPC_STAT:      /* arg.buf */
+    case IPC_SET:
+    case SEM_STAT:
+    case IPC_INFO:      /* arg.__buf */
+    case SEM_INFO:
+      va_start (ap, cmd);
+      arg64 = va_arg (ap, union semun64);
+      va_end (ap);
+      break;
+    }
+
+#if __IPC_TIME64
+  struct kernel_semid64_ds ksemid;
+  union ksemun64 ksemun = semun64_to_ksemun64 (cmd, arg64, &ksemid);
+# ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
+  if (cmd == IPC_SET)
+    ksemid.sem_perm.mode *= 0x10000U;
+# endif
+  union ksemun64 arg = ksemun;
+#else
+  union semun arg = arg64;
+#endif
+
+  int ret = semctl_syscall (semid, semnum, cmd, arg);
+  if (ret < 0)
+    return ret;
+
+  switch (cmd)
+    {
+    case IPC_STAT:
+    case SEM_STAT:
+    case SEM_STAT_ANY:
+#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
+      arg.buf->sem_perm.mode >>= 16;
+#else
+      /* Old Linux kernel versions might not clear the mode padding.  */
+      if (sizeof ((struct semid_ds){0}.sem_perm.mode)
+	  != sizeof (__kernel_mode_t))
+	arg.buf->sem_perm.mode &= 0xFFFF;
+#endif
+
+#if __IPC_TIME64
+      ksemid64_to_semid64 (arg.buf, arg64.buf);
+#endif
+    }
+
+  return ret;
+}
+#if __TIMESIZE != 64
+libc_hidden_def (__semctl64)
+
+
+/* The 64-bit time_t semid_ds version might have a different layout and
+   internal field alignment.  */
+
+static void
+semid_to_semid64 (struct __semid64_ds *ds64, const struct semid_ds *ds)
+{
+  ds64->sem_perm  = ds->sem_perm;
+  ds64->sem_otime = ds->sem_otime
+		    | ((__time64_t) ds->__sem_otime_high << 32);
+  ds64->sem_ctime = ds->sem_ctime
+		    | ((__time64_t) ds->__sem_ctime_high << 32);
+  ds64->sem_nsems = ds->sem_nsems;
+}
+
+static void
+semid64_to_semid (struct semid_ds *ds, const struct __semid64_ds *ds64)
+{
+  ds->sem_perm         = ds64->sem_perm;
+  ds->sem_otime        = ds64->sem_otime;
+  ds->__sem_otime_high = 0;
+  ds->sem_ctime        = ds64->sem_ctime;
+  ds->__sem_ctime_high = 0;
+  ds->sem_nsems        = ds64->sem_nsems;
+}
+
+static union semun64
+semun_to_semun64 (int cmd, union semun semun, struct __semid64_ds *semid64)
+{
+  union semun64 r = { 0 };
+  switch (cmd)
+    {
+    case SETVAL:
+      r.val = semun.val;
+      break;
+    case GETALL:
+    case SETALL:
+      r.array = semun.array;
+      break;
+    case SEM_STAT:
+    case IPC_STAT:
+    case IPC_SET:
+      r.buf = semid64;
+      semid_to_semid64 (r.buf, semun.buf);
+      break;
+    case IPC_INFO:
+    case SEM_INFO:
+      r.__buf = semun.__buf;
+      break;
+    }
+  return r;
+}
+
+int
+__semctl (int semid, int semnum, int cmd, ...)
+{
   union semun arg = { 0 };
+
   va_list ap;
 
   /* Get the argument only if required.  */
@@ -81,39 +275,33 @@ __new_semctl (int semid, int semnum, int cmd, ...)
       break;
     }
 
-#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
-  struct semid_ds tmpds;
-  if (cmd == IPC_SET)
-    {
-      tmpds = *arg.buf;
-      tmpds.sem_perm.mode *= 0x10000U;
-      arg.buf = &tmpds;
-    }
-#endif
+  struct __semid64_ds semid64;
+  union semun64 arg64 = semun_to_semun64 (cmd, arg, &semid64);
 
-  int ret = semctl_syscall (semid, semnum, cmd, arg);
+  int ret = __semctl64 (semid, semnum, cmd, arg64);
+  if (ret < 0)
+    return ret;
 
-  if (ret >= 0)
+  switch (cmd)
     {
-      switch (cmd)
-	{
-        case IPC_STAT:
-        case SEM_STAT:
-        case SEM_STAT_ANY:
-#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
-          arg.buf->sem_perm.mode >>= 16;
-#else
-	  /* Old Linux kernel versions might not clear the mode padding.  */
-	  if (sizeof ((struct semid_ds){0}.sem_perm.mode)
-	      != sizeof (__kernel_mode_t))
-	    arg.buf->sem_perm.mode &= 0xFFFF;
-#endif
-	}
+    case IPC_STAT:
+    case SEM_STAT:
+    case SEM_STAT_ANY:
+      semid64_to_semid (arg.buf, arg64.buf);
     }
 
   return ret;
 }
-versioned_symbol (libc, __new_semctl, semctl, DEFAULT_VERSION);
+#endif
+
+#ifndef DEFAULT_VERSION
+# ifndef __ASSUME_SYSVIPC_BROKEN_MODE_T
+#  define DEFAULT_VERSION GLIBC_2_2
+# else
+#  define DEFAULT_VERSION GLIBC_2_31
+# endif
+#endif
+versioned_symbol (libc, __semctl, semctl, DEFAULT_VERSION);
 
 #if defined __ASSUME_SYSVIPC_BROKEN_MODE_T \
     && SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_31)
@@ -121,7 +309,7 @@ int
 attribute_compat_text_section
 __semctl_mode16 (int semid, int semnum, int cmd, ...)
 {
-  union semun arg = { 0 };
+  semctl_arg_t arg = { 0 };
   va_list ap;
 
   /* Get the argument only if required.  */
@@ -136,7 +324,7 @@ __semctl_mode16 (int semid, int semnum, int cmd, ...)
     case IPC_INFO:      /* arg.__buf */
     case SEM_INFO:
       va_start (ap, cmd);
-      arg = va_arg (ap, union semun);
+      arg = va_arg (ap, semctl_arg_t);
       va_end (ap);
       break;
     }

sysdeps/unix/sysv/linux/sparc/bits/types/struct_semid_ds.h

@@ -25,9 +25,9 @@ struct semid_ds
 {
   struct ipc_perm sem_perm;   /* operation permission struct */
 #if __TIMESIZE == 32
-  __syscall_ulong_t __glibc_reserved1;
+  __syscall_ulong_t __sem_otime_high;
   __time_t sem_otime;         /* last semop() time */
-  __syscall_ulong_t __glibc_reserved2;
+  __syscall_ulong_t __sem_ctime_high;
   __time_t sem_ctime;        /* last time changed by semctl() */
 #else
   __time_t sem_otime;         /* last semop() time */

sysdeps/unix/sysv/linux/sparc/sparc32/struct_kernel_semid64_ds.h

@@ -0,0 +1,12 @@
+/* Analogous to kernel struct semid64_ds used on semctl.  */
+struct kernel_semid64_ds
+{
+  struct ipc_perm sem_perm;
+  unsigned long sem_otime_high;
+  unsigned long sem_otime;
+  unsigned long sem_ctime_high;
+  unsigned long sem_ctime;
+  unsigned long sem_nsems;
+  unsigned long __unused1;
+  unsigned long __unused2;
+};

sysdeps/unix/sysv/linux/struct_kernel_semid64_ds.h

@@ -0,0 +1,12 @@
+/* Analogous to kernel struct semid64_ds used on semctl.  */
+struct kernel_semid64_ds
+{
+  struct ipc_perm sem_perm;
+  unsigned long sem_otime;
+  unsigned long sem_otime_high;
+  unsigned long sem_ctime;
+  unsigned long sem_ctime_high;
+  unsigned long sem_nsems;
+  unsigned long __unused1;
+  unsigned long __unused2;
+};

sysdeps/unix/sysv/linux/x86/bits/types/struct_semid_ds.h

@@ -25,9 +25,9 @@ struct semid_ds
 {
   struct ipc_perm sem_perm;   /* operation permission struct */
   __time_t sem_otime;  /* last semop() time */
-  __syscall_ulong_t __glibc_reserved1;
+  __syscall_ulong_t __sem_otime_high;
   __time_t sem_ctime;  /* last time changed by semctl() */
-  __syscall_ulong_t __glibc_reserved2;
+  __syscall_ulong_t __sem_ctime_high;
   __syscall_ulong_t sem_nsems;    /* number of semaphores in set */
   __syscall_ulong_t __glibc_reserved3;
   __syscall_ulong_t __glibc_reserved4;