instrumentation/events/lttng-module/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/tracepoint.h>
   8
   9 #ifndef _TRACE_SIGNAL_DEF
  10 #define _TRACE_SIGNAL_DEF
  11 #include <linux/signal.h>
  12 #include <linux/sched.h>
  13 #undef TP_STORE_SIGINFO
  14 #define TP_STORE_SIGINFO(info)                                  \
  15                 tp_assign(errno,                                \
  16                         (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED || info == SEND_SIG_PRIV) ? \
  17                         0 :                                     \
  18                         info->si_errno)                         \
  19                 tp_assign(code,                                 \
  20                         (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED) ? \
  21                         SI_USER :                               \
  22                         ((info == SEND_SIG_PRIV) ? SI_KERNEL : info->si_code))
  23 #endif /* _TRACE_SIGNAL_DEF */
  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                 tp_assign(sig, sig)
  53                 TP_STORE_SIGINFO(info)
  54                 tp_memcpy(comm, task->comm, TASK_COMM_LEN)
  55                 tp_assign(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                 tp_assign(sig, sig)
  93                 TP_STORE_SIGINFO(info)
  94                 tp_assign(sa_handler, (unsigned long)ka->sa.sa_handler)
  95                 tp_assign(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 DECLARE_EVENT_CLASS(signal_queue_overflow,
 104
 105         TP_PROTO(int sig, int group, struct siginfo *info),
 106
 107         TP_ARGS(sig, group, info),
 108
 109         TP_STRUCT__entry(
 110                 __field(        int,    sig     )
 111                 __field(        int,    group   )
 112                 __field(        int,    errno   )
 113                 __field(        int,    code    )
 114         ),
 115
 116         TP_fast_assign(
 117                 tp_assign(sig, sig)
 118                 tp_assign(group, group)
 119                 TP_STORE_SIGINFO(info)
 120         ),
 121
 122         TP_printk("sig=%d group=%d errno=%d code=%d",
 123                   __entry->sig, __entry->group, __entry->errno, __entry->code)
 124 )
 125
 126 /**
 127  * signal_overflow_fail - called when signal queue is overflow
 128  * @sig: signal number
 129  * @group: signal to process group or not (bool)
 130  * @info: pointer to struct siginfo
 131  *
 132  * Kernel fails to generate 'sig' signal with 'info' siginfo, because
 133  * siginfo queue is overflow, and the signal is dropped.
 134  * 'group' is not 0 if the signal will be sent to a process group.
 135  * 'sig' is always one of RT signals.
 136  */
 137 DEFINE_EVENT(signal_queue_overflow, signal_overflow_fail,
 138
 139         TP_PROTO(int sig, int group, struct siginfo *info),
 140
 141         TP_ARGS(sig, group, info)
 142 )
 143
 144 /**
 145  * signal_lose_info - called when siginfo is lost
 146  * @sig: signal number
 147  * @group: signal to process group or not (bool)
 148  * @info: pointer to struct siginfo
 149  *
 150  * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
 151  * queue is overflow.
 152  * 'group' is not 0 if the signal will be sent to a process group.
 153  * 'sig' is always one of non-RT signals.
 154  */
 155 DEFINE_EVENT(signal_queue_overflow, signal_lose_info,
 156
 157         TP_PROTO(int sig, int group, struct siginfo *info),
 158
 159         TP_ARGS(sig, group, info)
 160 )
 161
 162 #endif /* _TRACE_SIGNAL_H */
 163
 164 /* This part must be outside protection */
 165 #include "../../../probes/define_trace.h"