LXR linux/include/trace/events/signal.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#undef TRACE_SYSTEM
   3#define TRACE_SYSTEM signal
   4
   5#if !defined(_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
   6#define _TRACE_SIGNAL_H
   7
   8#include <linux/signal.h>
   9#include <linux/sched.h>
  10#include <linux/tracepoint.h>
  11
  12#define TP_STORE_SIGINFO(__entry, info)                         \
  13        do {                                                    \
  14                if (info == SEND_SIG_NOINFO ||                  \
  15                    info == SEND_SIG_FORCED) {                  \
  16                        __entry->errno  = 0;                    \
  17                        __entry->code   = SI_USER;              \
  18                } else if (info == SEND_SIG_PRIV) {             \
  19                        __entry->errno  = 0;                    \
  20                        __entry->code   = SI_KERNEL;            \
  21                } else {                                        \
  22                        __entry->errno  = info->si_errno;       \
  23                        __entry->code   = info->si_code;        \
  24                }                                               \
  25        } while (0)
  26
  27#ifndef TRACE_HEADER_MULTI_READ
  28enum {
  29        TRACE_SIGNAL_DELIVERED,
  30        TRACE_SIGNAL_IGNORED,
  31        TRACE_SIGNAL_ALREADY_PENDING,
  32        TRACE_SIGNAL_OVERFLOW_FAIL,
  33        TRACE_SIGNAL_LOSE_INFO,
  34};
  35#endif
  36
  37/**
  38 * signal_generate - called when a signal is generated
  39 * @sig: signal number
  40 * @info: pointer to struct siginfo
  41 * @task: pointer to struct task_struct
  42 * @group: shared or private
  43 * @result: TRACE_SIGNAL_*
  44 *
  45 * Current process sends a 'sig' signal to 'task' process with
  46 * 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV,
  47 * 'info' is not a pointer and you can't access its field. Instead,
  48 * SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV
  49 * means that si_code is SI_KERNEL.
  50 */
  51TRACE_EVENT(signal_generate,
  52
  53        TP_PROTO(int sig, struct siginfo *info, struct task_struct *task,
  54                        int group, int result),
  55
  56        TP_ARGS(sig, info, task, group, result),
  57
  58        TP_STRUCT__entry(
  59                __field(        int,    sig                     )
  60                __field(        int,    errno                   )
  61                __field(        int,    code                    )
  62                __array(        char,   comm,   TASK_COMM_LEN   )
  63                __field(        pid_t,  pid                     )
  64                __field(        int,    group                   )
  65                __field(        int,    result                  )
  66        ),
  67
  68        TP_fast_assign(
  69                __entry->sig    = sig;
  70                TP_STORE_SIGINFO(__entry, info);
  71                memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
  72                __entry->pid    = task->pid;
  73                __entry->group  = group;
  74                __entry->result = result;
  75        ),
  76
  77        TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d grp=%d res=%d",
  78                  __entry->sig, __entry->errno, __entry->code,
  79                  __entry->comm, __entry->pid, __entry->group,
  80                  __entry->result)
  81);
  82
  83/**
  84 * signal_deliver - called when a signal is delivered
  85 * @sig: signal number
  86 * @info: pointer to struct siginfo
  87 * @ka: pointer to struct k_sigaction
  88 *
  89 * A 'sig' signal is delivered to current process with 'info' siginfo,
  90 * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
  91 * SIG_DFL.
  92 * Note that some signals reported by signal_generate tracepoint can be
  93 * lost, ignored or modified (by debugger) before hitting this tracepoint.
  94 * This means, this can show which signals are actually delivered, but
  95 * matching generated signals and delivered signals may not be correct.
  96 */
  97TRACE_EVENT(signal_deliver,
  98
  99        TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
 100
 101        TP_ARGS(sig, info, ka),
 102
 103        TP_STRUCT__entry(
 104                __field(        int,            sig             )
 105                __field(        int,            errno           )
 106                __field(        int,            code            )
 107                __field(        unsigned long,  sa_handler      )
 108                __field(        unsigned long,  sa_flags        )
 109        ),
 110
 111        TP_fast_assign(
 112                __entry->sig    = sig;
 113                TP_STORE_SIGINFO(__entry, info);
 114                __entry->sa_handler     = (unsigned long)ka->sa.sa_handler;
 115                __entry->sa_flags       = ka->sa.sa_flags;
 116        ),
 117
 118        TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
 119                  __entry->sig, __entry->errno, __entry->code,
 120                  __entry->sa_handler, __entry->sa_flags)
 121);
 122
 123#endif /* _TRACE_SIGNAL_H */
 124
 125/* This part must be outside protection */
 126#include <trace/define_trace.h>
 127