From: Ulrich Drepper <drepper@redhat.com>
Date: Fri, 11 Feb 2000 21:00:16 +0000 (+0000)
Subject: Linux/Alpha specific semctl implementation.
X-Git-Tag: upstream/2.30~10627^2~2669
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3b6c96e67b0aee54e255605a4126f029d0ec1c8b;p=external%2Fglibc.git

Linux/Alpha specific semctl implementation.
---

diff --git a/sysdeps/unix/sysv/linux/alpha/semctl.c b/sysdeps/unix/sysv/linux/alpha/semctl.c
new file mode 100644
index 0000000..6281e44
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/semctl.c
@@ -0,0 +1,132 @@
+/* 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 <stdarg.h>
+#include <sys/sem.h>
+#include <ipc_priv.h>
+
+#include <sysdep.h>
+#include <string.h>
+#include <sys/syscall.h>
+
+#include "kernel-features.h"
+
+struct __old_semid_ds
+{
+  struct __old_ipc_perm sem_perm;	/* operation permission struct */
+  __time_t sem_otime;			/* last semop() time */
+  __time_t sem_ctime;			/* last time changed by semctl() */
+  struct sem *__sembase;		/* ptr to first semaphore in array */
+  struct sem_queue *__sem_pending;	/* pending operations */
+  struct sem_queue *__sem_pending_last; /* last pending operation */
+  struct sem_undo *__undo;		/* ondo requests on this array */
+  unsigned short int sem_nsems;		/* number of semaphores in set */
+};
+
+/* Define a `union semun' suitable for Linux here.  */
+union semun
+{
+  int val;			/* value for SETVAL */
+  struct semid_ds *buf;		/* buffer for IPC_STAT & IPC_SET */
+  unsigned short int *array;	/* array for GETALL & SETALL */
+  struct seminfo *__buf;	/* buffer for IPC_INFO */
+};
+
+
+/* Return identifier for array of NSEMS semaphores associated with
+   KEY.  */
+int __new_semctl (int semid, int semnum, int cmd, ...);
+
+int
+__new_semctl (int semid, int semnum, int cmd, ...)
+{
+  union semun arg;
+  va_list ap;
+
+  va_start (ap, cmd);
+
+  /* Get the argument.  */
+  arg = va_arg (ap, union semun);
+
+  va_end (ap);
+
+#if __ASSUME_32BITUIDS > 0
+  return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64, &arg);
+#else
+  switch (cmd) {
+    case SEM_STAT:
+    case IPC_STAT:
+    case IPC_SET:
+      break;
+    default:
+      return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd, &arg);
+  }
+
+  {
+    int save_errno = errno, result;
+    struct __old_semid_ds old;
+    struct semid_ds *buf;
+
+    /* Unfortunately there is no way how to find out for sure whether
+       we should use old or new semctl.  */
+    result = INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64, &arg);
+    if (result != -1 || errno != EINVAL)
+      return result;
+
+    __set_errno(save_errno);
+    buf = arg.buf;
+    arg.buf = (struct semid_ds *)&old;
+    if (cmd == IPC_SET)
+      {
+	old.sem_perm.uid = buf->sem_perm.uid;
+	old.sem_perm.gid = buf->sem_perm.gid;
+	old.sem_perm.mode = buf->sem_perm.mode;
+	if (old.sem_perm.uid != buf->sem_perm.uid ||
+	    old.sem_perm.gid != buf->sem_perm.gid)
+	  {
+	    __set_errno (EINVAL);
+	    return -1;
+	  }
+      }
+    result = INLINE_SYSCALL (semctl, 4, semid, semnum, cmd, &arg);
+    if (result != -1 && cmd != IPC_SET)
+      {
+	memset(buf, 0, sizeof(*buf));
+	buf->sem_perm.__key = old.sem_perm.__key;
+	buf->sem_perm.uid = old.sem_perm.uid;
+	buf->sem_perm.gid = old.sem_perm.gid;
+	buf->sem_perm.cuid = old.sem_perm.cuid;
+	buf->sem_perm.cgid = old.sem_perm.cgid;
+	buf->sem_perm.mode = old.sem_perm.mode;
+	buf->sem_perm.__seq = old.sem_perm.__seq;
+	buf->sem_otime = old.sem_otime;
+	buf->sem_ctime = old.sem_ctime;
+	buf->sem_nsems = old.sem_nsems;
+      }
+    return result;
+  }
+#endif
+}
+
+#if defined PIC && DO_VERSIONING
+default_symbol_version (__new_semctl, semctl, GLIBC_2.2);
+#else
+weak_alias (__new_semctl, semctl);
+#endif