linux/include/linux/signalfd.h
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   1/*
   2 *  include/linux/signalfd.h
   3 *
   4 *  Copyright (C) 2007  Davide Libenzi <davidel@xmailserver.org>
   5 *
   6 */
   7
   8#ifndef _LINUX_SIGNALFD_H
   9#define _LINUX_SIGNALFD_H
  10
  11#include <linux/types.h>
  12/* For O_CLOEXEC and O_NONBLOCK */
  13#include <linux/fcntl.h>
  14
  15/* Flags for signalfd4.  */
  16#define SFD_CLOEXEC O_CLOEXEC
  17#define SFD_NONBLOCK O_NONBLOCK
  18
  19struct signalfd_siginfo {
  20        __u32 ssi_signo;
  21        __s32 ssi_errno;
  22        __s32 ssi_code;
  23        __u32 ssi_pid;
  24        __u32 ssi_uid;
  25        __s32 ssi_fd;
  26        __u32 ssi_tid;
  27        __u32 ssi_band;
  28        __u32 ssi_overrun;
  29        __u32 ssi_trapno;
  30        __s32 ssi_status;
  31        __s32 ssi_int;
  32        __u64 ssi_ptr;
  33        __u64 ssi_utime;
  34        __u64 ssi_stime;
  35        __u64 ssi_addr;
  36        __u16 ssi_addr_lsb;
  37
  38        /*
  39         * Pad strcture to 128 bytes. Remember to update the
  40         * pad size when you add new members. We use a fixed
  41         * size structure to avoid compatibility problems with
  42         * future versions, and we leave extra space for additional
  43         * members. We use fixed size members because this strcture
  44         * comes out of a read(2) and we really don't want to have
  45         * a compat on read(2).
  46         */
  47        __u8 __pad[46];
  48};
  49
  50
  51#ifdef __KERNEL__
  52
  53#ifdef CONFIG_SIGNALFD
  54
  55/*
  56 * Deliver the signal to listening signalfd.
  57 */
  58static inline void signalfd_notify(struct task_struct *tsk, int sig)
  59{
  60        if (unlikely(waitqueue_active(&tsk->sighand->signalfd_wqh)))
  61                wake_up(&tsk->sighand->signalfd_wqh);
  62}
  63
  64extern void signalfd_cleanup(struct sighand_struct *sighand);
  65
  66#else /* CONFIG_SIGNALFD */
  67
  68static inline void signalfd_notify(struct task_struct *tsk, int sig) { }
  69
  70static inline void signalfd_cleanup(struct sighand_struct *sighand) { }
  71
  72#endif /* CONFIG_SIGNALFD */
  73
  74#endif /* __KERNEL__ */
  75
  76#endif /* _LINUX_SIGNALFD_H */
  77
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