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