include/linux/signalfd.h

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