/* 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 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, 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 <shlib-compat.h> #include <bp-checks.h> #include "kernel-features.h" struct __old_msqid_ds { struct __old_ipc_perm msg_perm; /* structure describing operation permission */ struct msg *__unbounded __msg_first; /* pointer to first message on queue */ struct msg *__unbounded __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 *__unbounded __wwait; /* ??? */ struct wait_queue *__unbounded __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 __old_msgctl (int msqid, int cmd, struct __old_msqid_ds *buf) { return INLINE_SYSCALL (ipc, 5, IPCOP_msgctl, msqid, cmd, 0, CHECK_1 (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, CHECK_1 (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, CHECK_1 (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 (ipc, 5, IPCOP_msgctl, msqid, cmd | __IPC_64, 0, CHECK_1 (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 (ipc, 5, IPCOP_msgctl, msqid, cmd, 0, __ptrvalue (&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);