Linux/Alpha specific msgctl implementation.

diff --git a/sysdeps/unix/sysv/linux/alpha/msgctl.c b/sysdeps/unix/sysv/linux/alpha/msgctl.c
new file mode 100644 (file)
index 0000000..2d07b1f
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/msgctl.c
@@ -0,0 +1,120 @@
+/* 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/msg.h>
+#include <ipc_priv.h>
+
+#include <sysdep.h>
+#include <string.h>
+#include <sys/syscall.h>
+
+#include "kernel-features.h"
+
+struct __old_msqid_ds
+{
+  struct __old_ipc_perm msg_perm;      /* structure describing operation permission */
+  struct msg *__msg_first;             /* pointer to first message on queue */
+  struct msg *__msg_last;              /* pointer to last message on queue */
+  __time_t msg_stime;                  /* time of last msgsnd command */
+  __time_t msg_rtime;                  /* time of last msgrcv command */
+  __time_t msg_ctime;                  /* time of last change */
+  struct wait_queue *__wwait;          /* ??? */
+  struct wait_queue *__rwait;          /* ??? */
+  unsigned short int __msg_cbytes;     /* current number of bytes on queue */
+  unsigned short int msg_qnum;         /* number of messages currently on queue */
+  unsigned short int msg_qbytes;       /* max number of bytes allowed on queue */
+  __ipc_pid_t msg_lspid;               /* pid of last msgsnd() */
+  __ipc_pid_t msg_lrpid;               /* pid of last msgrcv() */
+};
+
+/* Allows to control internal state and destruction of message queue
+   objects.  */
+int __new_msgctl (int, int, struct msqid_ds *);
+
+int
+__new_msgctl (int msqid, int cmd, struct msqid_ds *buf)
+{
+#if __ASSUME_32BITUIDS > 0
+  return INLINE_SYSCALL (msgctl, 3, msqid, cmd | __IPC_64, buf);
+#else
+  switch (cmd) {
+    case MSG_STAT:
+    case IPC_STAT:
+    case IPC_SET:
+      break;
+    default:
+      return INLINE_SYSCALL (msgctl, 3, msqid, cmd, buf);
+  }
+
+  {
+    int save_errno = errno, result;
+    struct __old_msqid_ds old;
+
+    /* Unfortunately there is no way how to find out for sure whether
+       we should use old or new msgctl.  */
+    result = INLINE_SYSCALL (msgctl, 3, msqid, cmd | __IPC_64, buf);
+    if (result != -1 || errno != EINVAL)
+      return result;
+
+    __set_errno(save_errno);
+    if (cmd == IPC_SET)
+      {
+       old.msg_perm.uid = buf->msg_perm.uid;
+       old.msg_perm.gid = buf->msg_perm.gid;
+       old.msg_perm.mode = buf->msg_perm.mode;
+       old.msg_qbytes = buf->msg_qbytes;
+       if (old.msg_perm.uid != buf->msg_perm.uid ||
+           old.msg_perm.gid != buf->msg_perm.gid ||
+           old.msg_qbytes != buf->msg_qbytes)
+         {
+           __set_errno (EINVAL);
+           return -1;
+         }
+      }
+    result = INLINE_SYSCALL (msgctl, 3, msqid, cmd, &old);
+    if (result != -1 && cmd != IPC_SET)
+      {
+       memset(buf, 0, sizeof(*buf));
+       buf->msg_perm.__key = old.msg_perm.__key;
+       buf->msg_perm.uid = old.msg_perm.uid;
+       buf->msg_perm.gid = old.msg_perm.gid;
+       buf->msg_perm.cuid = old.msg_perm.cuid;
+       buf->msg_perm.cgid = old.msg_perm.cgid;
+       buf->msg_perm.mode = old.msg_perm.mode;
+       buf->msg_perm.__seq = old.msg_perm.__seq;
+       buf->msg_stime = old.msg_stime;
+       buf->msg_rtime = old.msg_rtime;
+       buf->msg_ctime = old.msg_ctime;
+       buf->__msg_cbytes = old.__msg_cbytes;
+       buf->msg_qnum = old.msg_qnum;
+       buf->msg_qbytes = old.msg_qbytes;
+       buf->msg_lspid = old.msg_lspid;
+       buf->msg_lrpid = old.msg_lrpid;
+      }
+    return result;
+  }
+#endif
+}
+
+#if defined PIC && DO_VERSIONING
+default_symbol_version (__new_msgctl, msgctl, GLIBC_2.2);
+#else
+weak_alias (__new_msgctl, msgctl);
+#endif