Linux/Alpha specific shmctl implementation.

diff --git a/sysdeps/unix/sysv/linux/alpha/shmctl.c b/sysdeps/unix/sysv/linux/alpha/shmctl.c
new file mode 100644 (file)
index 0000000..162afee
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/shmctl.c
@@ -0,0 +1,137 @@
+/* Copyright (C) 1995, 1997, 1998, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <sys/shm.h>
+#include <ipc_priv.h>
+
+#include <sysdep.h>
+#include <string.h>
+#include <sys/syscall.h>
+#include <bits/wordsize.h>
+
+#include "kernel-features.h"
+
+struct __old_shmid_ds
+{
+  struct __old_ipc_perm shm_perm;      /* operation permission struct */
+  int shm_segsz;                       /* size of segment in bytes */
+  __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() */
+  __ipc_pid_t shm_cpid;                        /* pid of creator */
+  __ipc_pid_t shm_lpid;                        /* pid of last shmop */
+  unsigned short int shm_nattch;       /* number of current attaches */
+  unsigned short int __shm_npages;     /* size of segment (pages) */
+  unsigned long int *__shm_pages;      /* array of ptrs to frames -> SHMMAX */
+  struct vm_area_struct *__attaches;   /* descriptors for attaches */
+};
+
+struct __old_shminfo
+{
+  int shmmax;
+  int shmmin;
+  int shmmni;
+  int shmseg;
+  int shmall;
+};
+
+/* Provide operations to control over shared memory segments.  */
+int __new_shmctl (int, int, struct shmid_ds *);
+
+int
+__new_shmctl (int shmid, int cmd, struct shmid_ds *buf)
+{
+#if __ASSUME_32BITUIDS > 0
+  return INLINE_SYSCALL (shmctl, 3, shmid, cmd | __IPC_64, buf);
+#else
+  switch (cmd) {
+    case SHM_STAT:
+    case IPC_STAT:
+    case IPC_SET:
+    case IPC_INFO:
+      break;
+    default:
+      return INLINE_SYSCALL (shmctl, 3, shmid, cmd, buf);
+  }
+
+  {
+    int save_errno = errno, result;
+    struct __old_shmid_ds old;
+
+    /* Unfortunately there is no way how to find out for sure whether
+       we should use old or new shmctl.  */
+    result = INLINE_SYSCALL (shmctl, 3, shmid, cmd | __IPC_64, buf);
+    if (result != -1 || errno != EINVAL)
+      return result;
+
+    __set_errno(save_errno);
+    if (cmd == IPC_SET)
+      {
+       old.shm_perm.uid = buf->shm_perm.uid;
+       old.shm_perm.gid = buf->shm_perm.gid;
+       old.shm_perm.mode = buf->shm_perm.mode;
+       if (old.shm_perm.uid != buf->shm_perm.uid ||
+           old.shm_perm.gid != buf->shm_perm.gid)
+         {
+           __set_errno (EINVAL);
+           return -1;
+         }
+      }
+    result = INLINE_SYSCALL (shmctl, 3, shmid, cmd, &old);
+    if (result != -1 && (cmd == SHM_STAT || cmd == IPC_STAT))
+      {
+       memset(buf, 0, sizeof(*buf));
+       buf->shm_perm.__key = old.shm_perm.__key;
+       buf->shm_perm.uid = old.shm_perm.uid;
+       buf->shm_perm.gid = old.shm_perm.gid;
+       buf->shm_perm.cuid = old.shm_perm.cuid;
+       buf->shm_perm.cgid = old.shm_perm.cgid;
+       buf->shm_perm.mode = old.shm_perm.mode;
+       buf->shm_perm.__seq = old.shm_perm.__seq;
+       buf->shm_atime = old.shm_atime;
+       buf->shm_dtime = old.shm_dtime;
+       buf->shm_ctime = old.shm_ctime;
+       buf->shm_segsz = old.shm_segsz;
+       buf->shm_nattch = old.shm_nattch;
+       buf->shm_cpid = old.shm_cpid;
+       buf->shm_lpid = old.shm_lpid;
+      }
+    else if (result != -1 && cmd == IPC_INFO)
+      {
+       struct __old_shminfo *oldi = (struct __old_shminfo *)&old;
+       struct shminfo *i = (struct shminfo *)buf;
+
+       memset(i, 0, sizeof(*i));
+       i->shmmax = oldi->shmmax;
+       i->shmmin = oldi->shmmin;
+       i->shmmni = oldi->shmmni;
+       i->shmseg = oldi->shmseg;
+       i->shmall = oldi->shmall;
+      }
+    return result;
+  }
+#endif
+}
+
+#if defined PIC && DO_VERSIONING
+default_symbol_version (__new_shmctl, shmctl, GLIBC_2.2);
+#else
+weak_alias (__new_shmctl, shmctl);
+#endif