aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/unix/sysv/linux/i386/msgctl.c
blob: 108da8a987c2cb61f4313190dba8eae56d804904 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
/* Copyright (C) 1995, 1997, 1998, 2000, 2004 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 <bp-checks.h>

#include "kernel-features.h"
#include <shlib-compat.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 *);

#ifdef __NR_getuid32
# if __ASSUME_32BITUIDS == 0
/* This variable is shared with all files that need to check for 32bit
   uids.  */
extern int __libc_missing_32bit_uids;
# endif
#endif

#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, 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_32BITUIDS > 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 result;
    struct __old_msqid_ds old;

#ifdef __NR_getuid32
    if (__libc_missing_32bit_uids <= 0)
      {
	if (__libc_missing_32bit_uids < 0)
	  {
	    int save_errno = errno;

	    /* Test presence of new IPC by testing for getuid32 syscall.  */
	    result = INLINE_SYSCALL (getuid32, 0);
	    if (result == -1 && errno == ENOSYS)
	      __libc_missing_32bit_uids = 1;
	    else
	      __libc_missing_32bit_uids = 0;
	    __set_errno(save_errno);
	  }
	if (__libc_missing_32bit_uids <= 0)
	  {
	    result = INLINE_SYSCALL (ipc, 5, IPCOP_msgctl,
				     msqid, cmd | __IPC_64, 0, CHECK_1 (buf));
	    return result;
	  }
      }
#endif
    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);