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