instrumentation/events/lttng-module/signal.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #undef TRACE_SYSTEM
   3 #define TRACE_SYSTEM signal
   4
   5 #if !defined(LTTNG_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
   6 #define LTTNG_TRACE_SIGNAL_H
   7
   8 #include <probes/lttng-tracepoint-event.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_PRIV) ? \
  18                         0 :                                     \
  19                         info->si_errno)                         \
  20                 ctf_integer(int, code,                          \
  21                         (info == SEND_SIG_NOINFO) ?             \
  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 LTTNG_TRACEPOINT_EVENT(signal_generate,
  39
  40         TP_PROTO(int sig, struct kernel_siginfo *info, struct task_struct *task,
  41                         int group, int result),
  42
  43         TP_ARGS(sig, info, task, group, result),
  44
  45         TP_FIELDS(
  46                 ctf_integer(int, sig, sig)
  47                 LTTNG_FIELDS_SIGINFO(info)
  48                 ctf_array_text(char, comm, task->comm, TASK_COMM_LEN)
  49                 ctf_integer(pid_t, pid, task->pid)
  50                 ctf_integer(int, group, group)
  51                 ctf_integer(int, result, result)
  52         )
  53 )
  54
  55 /**
  56  * signal_deliver - called when a signal is delivered
  57  * @sig: signal number
  58  * @info: pointer to struct siginfo
  59  * @ka: pointer to struct k_sigaction
  60  *
  61  * A 'sig' signal is delivered to current process with 'info' siginfo,
  62  * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
  63  * SIG_DFL.
  64  * Note that some signals reported by signal_generate tracepoint can be
  65  * lost, ignored or modified (by debugger) before hitting this tracepoint.
  66  * This means, this can show which signals are actually delivered, but
  67  * matching generated signals and delivered signals may not be correct.
  68  */
  69 LTTNG_TRACEPOINT_EVENT(signal_deliver,
  70
  71         TP_PROTO(int sig, struct kernel_siginfo *info, struct k_sigaction *ka),
  72
  73         TP_ARGS(sig, info, ka),
  74
  75         TP_FIELDS(
  76                 ctf_integer(int, sig, sig)
  77                 LTTNG_FIELDS_SIGINFO(info)
  78                 ctf_integer(unsigned long, sa_handler, (unsigned long) ka->sa.sa_handler)
  79                 ctf_integer(unsigned long, sa_flags, ka->sa.sa_flags)
  80         )
  81 )
  82
  83 #endif /* LTTNG_TRACE_SIGNAL_H */
  84
  85 /* This part must be outside protection */
  86 #include <probes/define_trace.h>