tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
12struct signalfd_siginfo {
13 __u32 signo;
14 __s32 err;
15 __s32 code;
16 __u32 pid;
17 __u32 uid;
18 __s32 fd;
19 __u32 tid;
20 __u32 band;
21 __u32 overrun;
22 __u32 trapno;
23 __s32 status;
24 __s32 svint;
25 __u64 svptr;
26 __u64 utime;
27 __u64 stime;
28 __u64 addr;
29
30 /*
31 * Pad strcture to 128 bytes. Remember to update the
32 * pad size when you add new memebers. We use a fixed
33 * size structure to avoid compatibility problems with
34 * future versions, and we leave extra space for additional
35 * members. We use fixed size members because this strcture
36 * comes out of a read(2) and we really don't want to have
37 * a compat on read(2).
38 */
39 __u8 __pad[48];
40};
41
42
43#ifdef __KERNEL__
44
45#ifdef CONFIG_SIGNALFD
46
47/*
48 * Deliver the signal to listening signalfd. This must be called
49 * with the sighand lock held. Same are the following that end up
50 * calling signalfd_deliver().
51 */
52void signalfd_deliver(struct task_struct *tsk, int sig);
53
54/*
55 * No need to fall inside signalfd_deliver() if no signal listeners
56 * are available.
57 */
58static inline void signalfd_notify(struct task_struct *tsk, int sig)
59{
60 if (unlikely(!list_empty(&tsk->sighand->signalfd_list)))
61 signalfd_deliver(tsk, sig);
62}
63
64/*
65 * The signal -1 is used to notify the signalfd that the sighand
66 * is on its way to be detached.
67 */
68static inline void signalfd_detach_locked(struct task_struct *tsk)
69{
70 if (unlikely(!list_empty(&tsk->sighand->signalfd_list)))
71 signalfd_deliver(tsk, -1);
72}
73
74static inline void signalfd_detach(struct task_struct *tsk)
75{
76 struct sighand_struct *sighand = tsk->sighand;
77
78 if (unlikely(!list_empty(&sighand->signalfd_list))) {
79 spin_lock_irq(&sighand->siglock);
80 signalfd_deliver(tsk, -1);
81 spin_unlock_irq(&sighand->siglock);
82 }
83}
84
85#else /* CONFIG_SIGNALFD */
86
87#define signalfd_deliver(t, s) do { } while (0)
88#define signalfd_notify(t, s) do { } while (0)
89#define signalfd_detach_locked(t) do { } while (0)
90#define signalfd_detach(t) do { } while (0)
91
92#endif /* CONFIG_SIGNALFD */
93
94#endif /* __KERNEL__ */
95
96#endif /* _LINUX_SIGNALFD_H */
97