instrumentation/events/lttng-module/signal.h

   1 #undef TRACE_SYSTEM
   2 #define TRACE_SYSTEM signal
   3
   4 #if !defined(LTTNG_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
   5 #define LTTNG_TRACE_SIGNAL_H
   6
   7 #include "../../../probes/lttng-tracepoint-event.h"
   8 #include <linux/version.h>
   9
  10 #ifndef _TRACE_SIGNAL_DEF
  11 #define _TRACE_SIGNAL_DEF
  12 #include <linux/signal.h>
  13 #include <linux/sched.h>
  14 #undef TP_STORE_SIGINFO
  15 #define TP_STORE_SIGINFO(info)                                  \
  16                 tp_assign(errno,                                \
  17                         (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED || info == SEND_SIG_PRIV) ? \
  18                         0 :                                     \
  19                         info->si_errno)                         \
  20                 tp_assign(code,                                 \
  21                         (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED) ? \
  22                         SI_USER :                               \
  23                         ((info == SEND_SIG_PRIV) ? SI_KERNEL : info->si_code))
  24 #endif /* _TRACE_SIGNAL_DEF */
  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 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
  39 LTTNG_TRACEPOINT_EVENT(signal_generate,
  40
  41         TP_PROTO(int sig, struct siginfo *info, struct task_struct *task),
  42
  43         TP_ARGS(sig, info, task),
  44
  45         TP_STRUCT__entry(
  46                 __field(        int,    sig                     )
  47                 __field(        int,    errno                   )
  48                 __field(        int,    code                    )
  49                 __array_text(   char,   comm,   TASK_COMM_LEN   )
  50                 __field(        pid_t,  pid                     )
  51         ),
  52
  53         TP_fast_assign(
  54                 tp_assign(sig, sig)
  55                 TP_STORE_SIGINFO(info)
  56                 tp_memcpy(comm, task->comm, TASK_COMM_LEN)
  57                 tp_assign(pid, task->pid)
  58         ),
  59
  60         TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d",
  61                   __entry->sig, __entry->errno, __entry->code,
  62                   __entry->comm, __entry->pid)
  63 )
  64 #else
  65 LTTNG_TRACEPOINT_EVENT(signal_generate,
  66
  67         TP_PROTO(int sig, struct siginfo *info, struct task_struct *task,
  68                         int group, int result),
  69
  70         TP_ARGS(sig, info, task, group, result),
  71
  72         TP_STRUCT__entry(
  73                 __field(        int,    sig                     )
  74                 __field(        int,    errno                   )
  75                 __field(        int,    code                    )
  76                 __array_text(   char,   comm,   TASK_COMM_LEN   )
  77                 __field(        pid_t,  pid                     )
  78                 __field(        int,    group                   )
  79                 __field(        int,    result                  )
  80         ),
  81
  82         TP_fast_assign(
  83                 tp_assign(sig, sig)
  84                 TP_STORE_SIGINFO(info)
  85                 tp_memcpy(comm, task->comm, TASK_COMM_LEN)
  86                 tp_assign(pid, task->pid)
  87                 tp_assign(group, group)
  88                 tp_assign(result, result)
  89         ),
  90
  91         TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d grp=%d res=%d",
  92                   __entry->sig, __entry->errno, __entry->code,
  93                   __entry->comm, __entry->pid, __entry->group,
  94                   __entry->result)
  95 )
  96 #endif
  97
  98 /**
  99  * signal_deliver - called when a signal is delivered
 100  * @sig: signal number
 101  * @info: pointer to struct siginfo
 102  * @ka: pointer to struct k_sigaction
 103  *
 104  * A 'sig' signal is delivered to current process with 'info' siginfo,
 105  * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
 106  * SIG_DFL.
 107  * Note that some signals reported by signal_generate tracepoint can be
 108  * lost, ignored or modified (by debugger) before hitting this tracepoint.
 109  * This means, this can show which signals are actually delivered, but
 110  * matching generated signals and delivered signals may not be correct.
 111  */
 112 LTTNG_TRACEPOINT_EVENT(signal_deliver,
 113
 114         TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
 115
 116         TP_ARGS(sig, info, ka),
 117
 118         TP_STRUCT__entry(
 119                 __field(        int,            sig             )
 120                 __field(        int,            errno           )
 121                 __field(        int,            code            )
 122                 __field(        unsigned long,  sa_handler      )
 123                 __field(        unsigned long,  sa_flags        )
 124         ),
 125
 126         TP_fast_assign(
 127                 tp_assign(sig, sig)
 128                 TP_STORE_SIGINFO(info)
 129                 tp_assign(sa_handler, (unsigned long)ka->sa.sa_handler)
 130                 tp_assign(sa_flags, ka->sa.sa_flags)
 131         ),
 132
 133         TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
 134                   __entry->sig, __entry->errno, __entry->code,
 135                   __entry->sa_handler, __entry->sa_flags)
 136 )
 137
 138 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
 139 LTTNG_TRACEPOINT_EVENT_CLASS(signal_queue_overflow,
 140
 141         TP_PROTO(int sig, int group, struct siginfo *info),
 142
 143         TP_ARGS(sig, group, info),
 144
 145         TP_STRUCT__entry(
 146                 __field(        int,    sig     )
 147                 __field(        int,    group   )
 148                 __field(        int,    errno   )
 149                 __field(        int,    code    )
 150         ),
 151
 152         TP_fast_assign(
 153                 tp_assign(sig, sig)
 154                 tp_assign(group, group)
 155                 TP_STORE_SIGINFO(info)
 156         ),
 157
 158         TP_printk("sig=%d group=%d errno=%d code=%d",
 159                   __entry->sig, __entry->group, __entry->errno, __entry->code)
 160 )
 161
 162 /**
 163  * signal_overflow_fail - called when signal queue is overflow
 164  * @sig: signal number
 165  * @group: signal to process group or not (bool)
 166  * @info: pointer to struct siginfo
 167  *
 168  * Kernel fails to generate 'sig' signal with 'info' siginfo, because
 169  * siginfo queue is overflow, and the signal is dropped.
 170  * 'group' is not 0 if the signal will be sent to a process group.
 171  * 'sig' is always one of RT signals.
 172  */
 173 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow, signal_overflow_fail,
 174
 175         TP_PROTO(int sig, int group, struct siginfo *info),
 176
 177         TP_ARGS(sig, group, info)
 178 )
 179
 180 /**
 181  * signal_lose_info - called when siginfo is lost
 182  * @sig: signal number
 183  * @group: signal to process group or not (bool)
 184  * @info: pointer to struct siginfo
 185  *
 186  * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
 187  * queue is overflow.
 188  * 'group' is not 0 if the signal will be sent to a process group.
 189  * 'sig' is always one of non-RT signals.
 190  */
 191 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow, signal_lose_info,
 192
 193         TP_PROTO(int sig, int group, struct siginfo *info),
 194
 195         TP_ARGS(sig, group, info)
 196 )
 197 #endif
 198
 199 #endif /* LTTNG_TRACE_SIGNAL_H */
 200
 201 /* This part must be outside protection */
 202 #include "../../../probes/define_trace.h"