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