diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha/msgctl.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/alpha/msgctl.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/msgctl.c b/sysdeps/unix/sysv/linux/alpha/msgctl.c new file mode 100644 index 0000000000..2d07b1f400 --- /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 |