Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[pandora-kernel.git] / include / trace / events / signal.h
1 #undef TRACE_SYSTEM
2 #define TRACE_SYSTEM signal
3
4 #if !defined(_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
5 #define _TRACE_SIGNAL_H
6
7 #include <linux/signal.h>
8 #include <linux/sched.h>
9 #include <linux/tracepoint.h>
10
11 #define TP_STORE_SIGINFO(__entry, info)                         \
12         do {                                                    \
13                 if (info == SEND_SIG_NOINFO) {                  \
14                         __entry->errno  = 0;                    \
15                         __entry->code   = SI_USER;              \
16                 } else if (info == SEND_SIG_PRIV) {             \
17                         __entry->errno  = 0;                    \
18                         __entry->code   = SI_KERNEL;            \
19                 } else {                                        \
20                         __entry->errno  = info->si_errno;       \
21                         __entry->code   = info->si_code;        \
22                 }                                               \
23         } while (0)
24
25 /**
26  * signal_generate - called when a signal is generated
27  * @sig: signal number
28  * @info: pointer to struct siginfo
29  * @task: pointer to struct task_struct
30  *
31  * Current process sends a 'sig' signal to 'task' process with
32  * 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV,
33  * 'info' is not a pointer and you can't access its field. Instead,
34  * SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV
35  * means that si_code is SI_KERNEL.
36  */
37 TRACE_EVENT(signal_generate,
38
39         TP_PROTO(int sig, struct siginfo *info, struct task_struct *task),
40
41         TP_ARGS(sig, info, task),
42
43         TP_STRUCT__entry(
44                 __field(        int,    sig                     )
45                 __field(        int,    errno                   )
46                 __field(        int,    code                    )
47                 __array(        char,   comm,   TASK_COMM_LEN   )
48                 __field(        pid_t,  pid                     )
49         ),
50
51         TP_fast_assign(
52                 __entry->sig    = sig;
53                 TP_STORE_SIGINFO(__entry, info);
54                 memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
55                 __entry->pid    = task->pid;
56         ),
57
58         TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d",
59                   __entry->sig, __entry->errno, __entry->code,
60                   __entry->comm, __entry->pid)
61 );
62
63 /**
64  * signal_deliver - called when a signal is delivered
65  * @sig: signal number
66  * @info: pointer to struct siginfo
67  * @ka: pointer to struct k_sigaction
68  *
69  * A 'sig' signal is delivered to current process with 'info' siginfo,
70  * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
71  * SIG_DFL.
72  * Note that some signals reported by signal_generate tracepoint can be
73  * lost, ignored or modified (by debugger) before hitting this tracepoint.
74  * This means, this can show which signals are actually delivered, but
75  * matching generated signals and delivered signals may not be correct.
76  */
77 TRACE_EVENT(signal_deliver,
78
79         TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
80
81         TP_ARGS(sig, info, ka),
82
83         TP_STRUCT__entry(
84                 __field(        int,            sig             )
85                 __field(        int,            errno           )
86                 __field(        int,            code            )
87                 __field(        unsigned long,  sa_handler      )
88                 __field(        unsigned long,  sa_flags        )
89         ),
90
91         TP_fast_assign(
92                 __entry->sig    = sig;
93                 TP_STORE_SIGINFO(__entry, info);
94                 __entry->sa_handler     = (unsigned long)ka->sa.sa_handler;
95                 __entry->sa_flags       = ka->sa.sa_flags;
96         ),
97
98         TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
99                   __entry->sig, __entry->errno, __entry->code,
100                   __entry->sa_handler, __entry->sa_flags)
101 );
102
103 /**
104  * signal_overflow_fail - called when signal queue is overflow
105  * @sig: signal number
106  * @group: signal to process group or not (bool)
107  * @info: pointer to struct siginfo
108  *
109  * Kernel fails to generate 'sig' signal with 'info' siginfo, because
110  * siginfo queue is overflow, and the signal is dropped.
111  * 'group' is not 0 if the signal will be sent to a process group.
112  * 'sig' is always one of RT signals.
113  */
114 TRACE_EVENT(signal_overflow_fail,
115
116         TP_PROTO(int sig, int group, struct siginfo *info),
117
118         TP_ARGS(sig, group, info),
119
120         TP_STRUCT__entry(
121                 __field(        int,    sig     )
122                 __field(        int,    group   )
123                 __field(        int,    errno   )
124                 __field(        int,    code    )
125         ),
126
127         TP_fast_assign(
128                 __entry->sig    = sig;
129                 __entry->group  = group;
130                 TP_STORE_SIGINFO(__entry, info);
131         ),
132
133         TP_printk("sig=%d group=%d errno=%d code=%d",
134                   __entry->sig, __entry->group, __entry->errno, __entry->code)
135 );
136
137 /**
138  * signal_lose_info - called when siginfo is lost
139  * @sig: signal number
140  * @group: signal to process group or not (bool)
141  * @info: pointer to struct siginfo
142  *
143  * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
144  * queue is overflow.
145  * 'group' is not 0 if the signal will be sent to a process group.
146  * 'sig' is always one of non-RT signals.
147  */
148 TRACE_EVENT(signal_lose_info,
149
150         TP_PROTO(int sig, int group, struct siginfo *info),
151
152         TP_ARGS(sig, group, info),
153
154         TP_STRUCT__entry(
155                 __field(        int,    sig     )
156                 __field(        int,    group   )
157                 __field(        int,    errno   )
158                 __field(        int,    code    )
159         ),
160
161         TP_fast_assign(
162                 __entry->sig    = sig;
163                 __entry->group  = group;
164                 TP_STORE_SIGINFO(__entry, info);
165         ),
166
167         TP_printk("sig=%d group=%d errno=%d code=%d",
168                   __entry->sig, __entry->group, __entry->errno, __entry->code)
169 );
170 #endif /* _TRACE_SIGNAL_H */
171
172 /* This part must be outside protection */
173 #include <trace/define_trace.h>