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