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signal/timer/event: timerfd compat code

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This patch implements the necessary compat code for the timerfd system call.

Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Davide Libenzi 2007-05-10 22:23:18 -07:00 committed by Linus Torvalds
parent 57ac889850
commit 83f5d12669
3 changed files with 32 additions and 4 deletions
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23
fs/compat.c
View file

@ -2225,3 +2225,26 @@ asmlinkage long compat_sys_signalfd(int ufd,
#endif /* CONFIG_SIGNALFD */
#ifdef CONFIG_TIMERFD
asmlinkage long compat_sys_timerfd(int ufd, int clockid, int flags,
const struct compat_itimerspec __user *utmr)
{
long res;
struct itimerspec t;
struct itimerspec __user *ut;
res = -EFAULT;
if (get_compat_itimerspec(&t, utmr))
goto err_exit;
ut = compat_alloc_user_space(sizeof(*ut));
if (copy_to_user(ut, &t, sizeof(t)) )
goto err_exit;
res = sys_timerfd(ufd, clockid, flags, ut);
err_exit:
return res;
}
#endif /* CONFIG_TIMERFD */

5
include/linux/compat.h
View file

@ -225,6 +225,11 @@ static inline int compat_timespec_compare(struct compat_timespec *lhs,
return lhs->tv_nsec - rhs->tv_nsec;
}
extern int get_compat_itimerspec(struct itimerspec *dst,
const struct compat_itimerspec __user *src);
extern int put_compat_itimerspec(struct compat_itimerspec __user *dst,
const struct itimerspec *src);
asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
extern int compat_printk(const char *fmt, ...);

8
kernel/compat.c
View file

@ -475,8 +475,8 @@ asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
return min_length;
}
static int get_compat_itimerspec(struct itimerspec *dst,
struct compat_itimerspec __user *src)
int get_compat_itimerspec(struct itimerspec *dst,
const struct compat_itimerspec __user *src)
{
if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
get_compat_timespec(&dst->it_value, &src->it_value))
@ -484,8 +484,8 @@ static int get_compat_itimerspec(struct itimerspec *dst,
return 0;
}
static int put_compat_itimerspec(struct compat_itimerspec __user *dst,
struct itimerspec *src)
int put_compat_itimerspec(struct compat_itimerspec __user *dst,
const struct itimerspec *src)
{
if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
put_compat_timespec(&src->it_value, &dst->it_value))