1/* Copyright (C) 1995-2020 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <sys/msg.h>
20#include <ipc_priv.h>
21#include <sysdep.h>
22#include <shlib-compat.h>
23#include <errno.h>
24
25#ifndef DEFAULT_VERSION
26# ifndef __ASSUME_SYSVIPC_BROKEN_MODE_T
27# define DEFAULT_VERSION GLIBC_2_2
28# else
29# define DEFAULT_VERSION GLIBC_2_31
30# endif
31#endif
32
33static int
34msgctl_syscall (int msqid, int cmd, struct msqid_ds *buf)
35{
36#ifdef __ASSUME_DIRECT_SYSVIPC_SYSCALLS
37 return INLINE_SYSCALL_CALL (msgctl, msqid, cmd | __IPC_64, buf);
38#else
39 return INLINE_SYSCALL_CALL (ipc, IPCOP_msgctl, msqid, cmd | __IPC_64, 0,
40 buf);
41#endif
42}
43
44int
45__new_msgctl (int msqid, int cmd, struct msqid_ds *buf)
46{
47 /* POSIX states ipc_perm mode should have type of mode_t. */
48 _Static_assert (sizeof ((struct msqid_ds){0}.msg_perm.mode)
49 == sizeof (mode_t),
50 "sizeof (msqid_ds.msg_perm.mode) != sizeof (mode_t)");
51
52#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
53 struct msqid_ds tmpds;
54 if (cmd == IPC_SET)
55 {
56 tmpds = *buf;
57 tmpds.msg_perm.mode *= 0x10000U;
58 buf = &tmpds;
59 }
60#endif
61
62 int ret = msgctl_syscall (msqid, cmd, buf);
63
64#ifdef __ASSUME_SYSVIPC_BROKEN_MODE_T
65 if (ret >= 0)
66 {
67 switch (cmd)
68 {
69 case IPC_STAT:
70 case MSG_STAT:
71 case MSG_STAT_ANY:
72 buf->msg_perm.mode >>= 16;
73 }
74 }
75#endif
76
77 return ret;
78}
79versioned_symbol (libc, __new_msgctl, msgctl, DEFAULT_VERSION);
80
81#if defined __ASSUME_SYSVIPC_BROKEN_MODE_T \
82 && SHLIB_COMPAT (libc, GLIBC_2_2, GLIBC_2_31)
83int
84attribute_compat_text_section
85__msgctl_mode16 (int msqid, int cmd, struct msqid_ds *buf)
86{
87 return msgctl_syscall (msqid, cmd, buf);
88}
89compat_symbol (libc, __msgctl_mode16, msgctl, GLIBC_2_2);
90#endif
91
92#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2)
93struct __old_msqid_ds
94{
95 struct __old_ipc_perm msg_perm; /* structure describing operation permission */
96 struct msg *__msg_first; /* pointer to first message on queue */
97 struct msg *__msg_last; /* pointer to last message on queue */
98 __time_t msg_stime; /* time of last msgsnd command */
99 __time_t msg_rtime; /* time of last msgrcv command */
100 __time_t msg_ctime; /* time of last change */
101 struct wait_queue *__wwait; /* ??? */
102 struct wait_queue *__rwait; /* ??? */
103 unsigned short int __msg_cbytes; /* current number of bytes on queue */
104 unsigned short int msg_qnum; /* number of messages currently on queue */
105 unsigned short int msg_qbytes; /* max number of bytes allowed on queue */
106 __ipc_pid_t msg_lspid; /* pid of last msgsnd() */
107 __ipc_pid_t msg_lrpid; /* pid of last msgrcv() */
108};
109
110int
111attribute_compat_text_section
112__old_msgctl (int msqid, int cmd, struct __old_msqid_ds *buf)
113{
114#if defined __ASSUME_DIRECT_SYSVIPC_SYSCALLS \
115 && !defined __ASSUME_SYSVIPC_DEFAULT_IPC_64
116 /* For architecture that have wire-up msgctl but also have __IPC_64 to a
117 value different than default (0x0) it means the compat symbol used the
118 __NR_ipc syscall. */
119 return INLINE_SYSCALL_CALL (msgctl, msqid, cmd, buf);
120#else
121 return INLINE_SYSCALL_CALL (ipc, IPCOP_msgctl, msqid, cmd, 0, buf);
122#endif
123}
124compat_symbol (libc, __old_msgctl, msgctl, GLIBC_2_0);
125#endif
126