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