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
  28 enum {
  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  */
  51 TRACE_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  */
  97 TRACE_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>