diff options
Diffstat (limited to 'include/linux/signalfd.h')
-rw-r--r-- | include/linux/signalfd.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/include/linux/signalfd.h b/include/linux/signalfd.h new file mode 100644 index 00000000000..51042949569 --- /dev/null +++ b/include/linux/signalfd.h @@ -0,0 +1,97 @@ +/* + * 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 */ + |