3 * 32 bit emulation for POSIX message queue system calls
5 * Copyright (C) 2004 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author: Arnd Bergmann <arnd@arndb.de>
9 #include <linux/compat.h>
11 #include <linux/kernel.h>
12 #include <linux/mqueue.h>
13 #include <linux/syscalls.h>
15 #include <asm/uaccess.h>
17 struct compat_mq_attr {
18 compat_long_t mq_flags; /* message queue flags */
19 compat_long_t mq_maxmsg; /* maximum number of messages */
20 compat_long_t mq_msgsize; /* maximum message size */
21 compat_long_t mq_curmsgs; /* number of messages currently queued */
22 compat_long_t __reserved[4]; /* ignored for input, zeroed for output */
25 static inline int get_compat_mq_attr(struct mq_attr *attr,
26 const struct compat_mq_attr __user *uattr)
28 if (verify_area(VERIFY_READ, uattr, sizeof *uattr))
31 return __get_user(attr->mq_flags, &uattr->mq_flags)
32 | __get_user(attr->mq_maxmsg, &uattr->mq_maxmsg)
33 | __get_user(attr->mq_msgsize, &uattr->mq_msgsize)
34 | __get_user(attr->mq_curmsgs, &uattr->mq_curmsgs);
37 static inline int put_compat_mq_attr(const struct mq_attr *attr,
38 struct compat_mq_attr __user *uattr)
40 if (clear_user(uattr, sizeof *uattr))
43 return __put_user(attr->mq_flags, &uattr->mq_flags)
44 | __put_user(attr->mq_maxmsg, &uattr->mq_maxmsg)
45 | __put_user(attr->mq_msgsize, &uattr->mq_msgsize)
46 | __put_user(attr->mq_curmsgs, &uattr->mq_curmsgs);
49 asmlinkage long compat_sys_mq_open(const char __user *u_name,
50 int oflag, compat_mode_t mode,
51 struct compat_mq_attr __user *u_attr)
58 if ((oflag & O_CREAT) == 0 || !u_attr)
59 return sys_mq_open(u_name, oflag, mode, 0);
61 if (get_compat_mq_attr(&attr, u_attr))
64 name = getname(u_name);
70 ret = sys_mq_open(name, oflag, mode, &attr);
77 static struct timespec __user *compat_prepare_timeout(
78 const struct compat_timespec __user *u_abs_timeout)
80 struct timespec ts, __user *u_ts;
85 u_ts = compat_alloc_user_space(sizeof(*u_ts));
86 if (get_compat_timespec(&ts, u_abs_timeout)
87 || copy_to_user(u_ts, &ts, sizeof(*u_ts)))
88 return ERR_PTR(-EFAULT);
93 asmlinkage long compat_sys_mq_timedsend(mqd_t mqdes,
94 const char __user *u_msg_ptr,
95 size_t msg_len, unsigned int msg_prio,
96 const struct compat_timespec __user *u_abs_timeout)
98 struct timespec __user *u_ts;
100 u_ts = compat_prepare_timeout(u_abs_timeout);
104 return sys_mq_timedsend(mqdes, u_msg_ptr, msg_len,
108 asmlinkage ssize_t compat_sys_mq_timedreceive(mqd_t mqdes,
109 char __user *u_msg_ptr,
110 size_t msg_len, unsigned int __user *u_msg_prio,
111 const struct compat_timespec __user *u_abs_timeout)
113 struct timespec *u_ts;
115 u_ts = compat_prepare_timeout(u_abs_timeout);
119 return sys_mq_timedreceive(mqdes, u_msg_ptr, msg_len,
123 static int get_compat_sigevent(struct sigevent *event,
124 const struct compat_sigevent __user *u_event)
126 if (verify_area(VERIFY_READ, u_event, sizeof(*u_event)))
129 return __get_user(event->sigev_value.sival_int,
130 &u_event->sigev_value.sival_int)
131 | __get_user(event->sigev_signo, &u_event->sigev_signo)
132 | __get_user(event->sigev_notify, &u_event->sigev_notify)
133 | __get_user(event->sigev_notify_thread_id,
134 &u_event->sigev_notify_thread_id);
137 asmlinkage long compat_sys_mq_notify(mqd_t mqdes,
138 const struct compat_sigevent __user *u_notification)
141 struct sigevent notification;
142 char cookie[NOTIFY_COOKIE_LEN];
143 compat_uptr_t u_cookie;
147 return sys_mq_notify(mqdes, 0);
149 if (get_compat_sigevent(¬ification, u_notification))
152 if (notification.sigev_notify == SIGEV_THREAD) {
153 u_cookie = (compat_uptr_t)notification.sigev_value.sival_int;
154 if (copy_from_user(cookie, compat_ptr(u_cookie),
155 NOTIFY_COOKIE_LEN)) {
158 notification.sigev_value.sival_ptr = cookie;
163 ret = sys_mq_notify(mqdes, ¬ification);
169 asmlinkage long compat_sys_mq_getsetattr(mqd_t mqdes,
170 const struct compat_mq_attr __user *u_mqstat,
171 struct compat_mq_attr __user *u_omqstat)
173 struct mq_attr mqstat, omqstat;
174 struct mq_attr *p_mqstat = 0, *p_omqstat = 0;
180 if (get_compat_mq_attr(p_mqstat, u_mqstat))
185 p_omqstat = &omqstat;
189 ret = sys_mq_getsetattr(mqdes, p_mqstat, p_omqstat);
195 return (u_omqstat) ? put_compat_mq_attr(&omqstat, u_omqstat) : 0;