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/*
* include/linux/signalfd.h
*
* Copyright (C) 2007 Davide Libenzi <davidel@xmailserver.org>
*
*/
#ifndef _LINUX_SIGNALFD_H
#define _LINUX_SIGNALFD_H
struct signalfd_siginfo {
__u32 signo;
__s32 err;
__s32 code;
__u32 pid;
__u32 uid;
__s32 fd;
__u32 tid;
__u32 band;
__u32 overrun;
__u32 trapno;
__s32 status;
__s32 svint;
__u64 svptr;
__u64 utime;
__u64 stime;
__u64 addr;
/*
* Pad strcture to 128 bytes. Remember to update the
* pad size when you add new memebers. We use a fixed
* size structure to avoid compatibility problems with
* future versions, and we leave extra space for additional
* members. We use fixed size members because this strcture
* comes out of a read(2) and we really don't want to have
* a compat on read(2).
*/
__u8 __pad[48];
};
#ifdef __KERNEL__
#ifdef CONFIG_SIGNALFD
/*
* Deliver the signal to listening signalfd. This must be called
* with the sighand lock held. Same are the following that end up
* calling signalfd_deliver().
*/
void signalfd_deliver(struct task_struct *tsk, int sig);
/*
* No need to fall inside signalfd_deliver() if no signal listeners
* are available.
*/
static inline void signalfd_notify(struct task_struct *tsk, int sig)
{
if (unlikely(!list_empty(&tsk->sighand->signalfd_list)))
signalfd_deliver(tsk, sig);
}
/*
* The signal -1 is used to notify the signalfd that the sighand
* is on its way to be detached.
*/
static inline void signalfd_detach_locked(struct task_struct *tsk)
{
if (unlikely(!list_empty(&tsk->sighand->signalfd_list)))
signalfd_deliver(tsk, -1);
}
static inline void signalfd_detach(struct task_struct *tsk)
{
struct sighand_struct *sighand = tsk->sighand;
if (unlikely(!list_empty(&sighand->signalfd_list))) {
spin_lock_irq(&sighand->siglock);
signalfd_deliver(tsk, -1);
spin_unlock_irq(&sighand->siglock);
}
}
#else /* CONFIG_SIGNALFD */
#define signalfd_deliver(t, s) do { } while (0)
#define signalfd_notify(t, s) do { } while (0)
#define signalfd_detach_locked(t) do { } while (0)
#define signalfd_detach(t) do { } while (0)
#endif /* CONFIG_SIGNALFD */
#endif /* __KERNEL__ */
#endif /* _LINUX_SIGNALFD_H */
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