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/* Copyright (C) 1995-2020 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
<https://www.gnu.org/licenses/>. */
#include <sys/msg.h>
#include <ipc_priv.h>
#include <sysdep.h>
#include <shlib-compat.h>
#include <errno.h>
#include <linux/posix_types.h> /* For __kernel_mode_t. */
/* POSIX states ipc_perm mode should have type of mode_t. */
_Static_assert (sizeof ((struct msqid_ds){0}.msg_perm.mode)
== sizeof (mode_t),
"sizeof (msqid_ds.msg_perm.mode) != sizeof (mode_t)");
#if __IPC_TIME64 == 0
typedef struct msqid_ds msgctl_arg_t;
#else
# include <struct_kernel_msqid64_ds.h>
static void
msqid64_to_kmsqid64 (const struct __msqid64_ds *msqid64,
struct kernel_msqid64_ds *kmsqid)
{
kmsqid->msg_perm = msqid64->msg_perm;
kmsqid->msg_stime = msqid64->msg_stime;
kmsqid->msg_stime_high = msqid64->msg_stime >> 32;
kmsqid->msg_rtime = msqid64->msg_rtime;
kmsqid->msg_rtime_high = msqid64->msg_rtime >> 32;
kmsqid->msg_ctime = msqid64->msg_ctime;
kmsqid->msg_ctime_high = msqid64->msg_ctime >> 32;
kmsqid->msg_cbytes = msqid64->msg_cbytes;
kmsqid->msg_qnum = msqid64->msg_qnum;
kmsqid->msg_qbytes = msqid64->msg_qbytes;
kmsqid->msg_lspid = msqid64->msg_lspid;
kmsqid->msg_lrpid = msqid64->msg_lrpid;
}
static void
kmsqid64_to_msqid64 (const struct kernel_msqid64_ds *kmsqid,
struct __msqid64_ds *msqid64)
{
msqid64->msg_perm = kmsqid->msg_perm;
msqid64->msg_stime = kmsqid->msg_stime
| ((__time64_t) kmsqid->msg_stime_high << 32);
msqid64->msg_rtime = kmsqid->msg_rtime
| ((__time64_t) kmsqid->msg_rtime_high << 32);
msqid64->msg_ctime = kmsqid->msg_ctime
| ((__time64_t) kmsqid->msg_ctime_high << 32);
msqid64->msg_cbytes = kmsqid->msg_cbytes;
msqid64->msg_qnum = kmsqid->msg_qnum;
msqid64->msg_qbytes = kmsqid->msg_qbytes;
msqid64->msg_lspid = kmsqid->msg_lspid;
msqid64->msg_lrpid = kmsqid->msg_lrpid;
}
typedef struct kernel_msqid64_ds msgctl_arg_t;
#endif
static int
msgctl_syscall (int msqid, int cmd, msgctl_arg_t *buf)
{
#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
return INLINE_SYSCALL_CALL (msgctl, msqid, cmd | __IPC_64, buf);
#else
return INLINE_SYSCALL_CALL (ipc, IPCOP_msgctl, msqid, cmd | __IPC_64, 0,
buf);
#endif
}
int
__msgctl64 (int msqid, int cmd, struct __msqid64_ds *buf)
{
#if __IPC_TIME64
struct kernel_msqid64_ds ksemid, *arg = NULL;
#else
msgctl_arg_t *arg;
#endif
switch (cmd)
{
case IPC_RMID:
arg = NULL;
break;
case IPC_SET:
case IPC_STAT:
case MSG_STAT:
case MSG_STAT_ANY:
#if __IPC_TIME64
if (buf != NULL)
{
msqid64_to_kmsqid64 (buf, &ksemid);
arg = &ksemid;
}
# ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
if (cmd == IPC_SET)
arg->msg_perm.mode *= 0x10000U;
# endif
#else
arg = buf;
#endif
break;
case IPC_INFO:
case MSG_INFO:
/* This is a Linux extension where kernel returns a 'struct msginfo'
instead. */
arg = (__typeof__ (arg)) buf;
break;
default:
__set_errno (EINVAL);
return -1;
}
int ret = msgctl_syscall (msqid, cmd, arg);
if (ret < 0)
return ret;
switch (cmd)
{
case IPC_STAT:
case MSG_STAT:
case MSG_STAT_ANY:
#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
arg->msg_perm.mode >>= 16;
#else
/* Old Linux kernel versions might not clear the mode padding. */
if (sizeof ((struct msqid_ds){0}.msg_perm.mode)
!= sizeof (__kernel_mode_t))
arg->msg_perm.mode &= 0xFFFF;
#endif
#if __IPC_TIME64
kmsqid64_to_msqid64 (arg, buf);
#endif
}
return ret;
}
#if __TIMESIZE != 64
libc_hidden_def (__msgctl64)
static void
msqid_to_msqid64 (struct __msqid64_ds *mq64, const struct msqid_ds *mq)
{
mq64->msg_perm = mq->msg_perm;
mq64->msg_stime = mq->msg_stime
| ((__time64_t) mq->__msg_stime_high << 32);
mq64->msg_rtime = mq->msg_rtime
| ((__time64_t) mq->__msg_rtime_high << 32);
mq64->msg_ctime = mq->msg_ctime
| ((__time64_t) mq->__msg_ctime_high << 32);
mq64->msg_cbytes = mq->msg_cbytes;
mq64->msg_qnum = mq->msg_qnum;
mq64->msg_qbytes = mq->msg_qbytes;
mq64->msg_lspid = mq->msg_lspid;
mq64->msg_lrpid = mq->msg_lrpid;
}
static void
msqid64_to_msqid (struct msqid_ds *mq, const struct __msqid64_ds *mq64)
{
mq->msg_perm = mq64->msg_perm;
mq->msg_stime = mq64->msg_stime;
mq->__msg_stime_high = 0;
mq->msg_rtime = mq64->msg_rtime;
mq->__msg_rtime_high = 0;
mq->msg_ctime = mq64->msg_ctime;
mq->__msg_ctime_high = 0;
mq->msg_cbytes = mq64->msg_cbytes;
mq->msg_qnum = mq64->msg_qnum;
mq->msg_qbytes = mq64->msg_qbytes;
mq->msg_lspid = mq64->msg_lspid;
mq->msg_lrpid = mq64->msg_lrpid;
}
int
__msgctl (int msqid, int cmd, struct msqid_ds *buf)
{
struct __msqid64_ds msqid64, *buf64 = NULL;
if (buf != NULL)
{
/* This is a Linux extension where kernel returns a 'struct msginfo'
instead. */
if (cmd == IPC_INFO || cmd == MSG_INFO)
buf64 = (struct __msqid64_ds *) buf;
else
{
msqid_to_msqid64 (&msqid64, buf);
buf64 = &msqid64;
}
}
int ret = __msgctl64 (msqid, cmd, buf64);
if (ret < 0)
return ret;
switch (cmd)
{
case IPC_STAT:
case MSG_STAT:
case MSG_STAT_ANY:
msqid64_to_msqid (buf, buf64);
}
return ret;
}
#endif
#ifndef DEFAULT_VERSION
# ifndef __ASSUME_SYSVIPC_BROKEN_MODE_T
# define DEFAULT_VERSION GLIBC_2_2
# else
# define DEFAULT_VERSION GLIBC_2_31
# endif
#endif
versioned_symbol (libc, __msgctl, msgctl, DEFAULT_VERSION);
#if defined __ASSUME_SYSVIPC_BROKEN_MODE_T \
&& SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_31)
int
attribute_compat_text_section
__msgctl_mode16 (int msqid, int cmd, struct msqid_ds *buf)
{
return msgctl_syscall (msqid, cmd, (msgctl_arg_t *) buf);
}
compat_symbol (libc, __msgctl_mode16, msgctl, GLIBC_2_2);
#endif
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
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() */
};
int
attribute_compat_text_section
__old_msgctl (int msqid, int cmd, struct __old_msqid_ds *buf)
{
#if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS \
&& !defined __ASSUME_SYSVIPC_DEFAULT_IPC_64
/* For architecture that have wire-up msgctl but also have __IPC_64 to a
value different than default (0x0) it means the compat symbol used the
__NR_ipc syscall. */
return INLINE_SYSCALL_CALL (msgctl, msqid, cmd, buf);
#else
return INLINE_SYSCALL_CALL (ipc, IPCOP_msgctl, msqid, cmd, 0, buf);
#endif
}
compat_symbol (libc, __old_msgctl, msgctl, GLIBC_2_0);
#endif
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