| /* Copyright (C) 1995-2014 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 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <errno.h> |
| #include <sys/msg.h> |
| #include <ipc_priv.h> |
| |
| #include <sysdep.h> |
| #include <string.h> |
| #include <sys/syscall.h> |
| #include <shlib-compat.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. */ |
| #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) |
| int __old_msgctl (int, int, struct __old_msqid_ds *); |
| #endif |
| int __new_msgctl (int, int, struct msqid_ds *); |
| |
| #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) |
| int |
| attribute_compat_text_section |
| __old_msgctl (int msqid, int cmd, struct __old_msqid_ds *buf) |
| { |
| return INLINE_SYSCALL (ipc, 5, IPCOP_msgctl, msqid, cmd, 0, buf); |
| } |
| compat_symbol (libc, __old_msgctl, msgctl, GLIBC_2_0); |
| #endif |
| |
| int |
| __new_msgctl (int msqid, int cmd, struct msqid_ds *buf) |
| { |
| #if __ASSUME_IPC64 > 0 |
| return INLINE_SYSCALL (ipc, 5, IPCOP_msgctl, |
| msqid, cmd | __IPC_64, 0, buf); |
| #else |
| switch (cmd) { |
| case MSG_STAT: |
| case IPC_STAT: |
| case IPC_SET: |
| break; |
| default: |
| return INLINE_SYSCALL (ipc, 5, IPCOP_msgctl, |
| msqid, cmd, 0, buf); |
| } |
| |
| { |
| int 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 (ipc, 5, IPCOP_msgctl, |
| msqid, cmd | __IPC_64, 0, buf); |
| if (result != -1 || errno != EINVAL) |
| return result; |
| |
| 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 (ipc, 5, IPCOP_msgctl, msqid, cmd, 0, &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 |
| } |
| |
| versioned_symbol (libc, __new_msgctl, msgctl, GLIBC_2_2); |