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

   1#undef TRACE_SYSTEM
   2#define TRACE_SYSTEM signal
   3
   4#if !defined(_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
   5#define _TRACE_SIGNAL_H
   6
   7#include <linux/signal.h>
   8#include <linux/sched.h>
   9#include <linux/tracepoint.h>
  10
  11#define TP_STORE_SIGINFO(__entry, info)                         \
  12        do {                                                    \
  13                if (info == SEND_SIG_NOINFO ||                  \
  14                    info == SEND_SIG_FORCED) {                  \
  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/**
  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 */
  38TRACE_EVENT(signal_generate,
  39
  40        TP_PROTO(int sig, struct siginfo *info, struct task_struct *task),
  41
  42        TP_ARGS(sig, info, task),
  43
  44        TP_STRUCT__entry(
  45                __field(        int,    sig                     )
  46                __field(        int,    errno                   )
  47                __field(        int,    code                    )
  48                __array(        char,   comm,   TASK_COMM_LEN   )
  49                __field(        pid_t,  pid                     )
  50        ),
  51
  52        TP_fast_assign(
  53                __entry->sig    = sig;
  54                TP_STORE_SIGINFO(__entry, info);
  55                memcpy(__entry->comm, task->comm, TASK_COMM_LEN);
  56                __entry->pid    = task->pid;
  57        ),
  58
  59        TP_printk("sig=%d errno=%d code=%d comm=%s pid=%d",
  60                  __entry->sig, __entry->errno, __entry->code,
  61                  __entry->comm, __entry->pid)
  62);
  63
  64/**
  65 * signal_deliver - called when a signal is delivered
  66 * @sig: signal number
  67 * @info: pointer to struct siginfo
  68 * @ka: pointer to struct k_sigaction
  69 *
  70 * A 'sig' signal is delivered to current process with 'info' siginfo,
  71 * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
  72 * SIG_DFL.
  73 * Note that some signals reported by signal_generate tracepoint can be
  74 * lost, ignored or modified (by debugger) before hitting this tracepoint.
  75 * This means, this can show which signals are actually delivered, but
  76 * matching generated signals and delivered signals may not be correct.
  77 */
  78TRACE_EVENT(signal_deliver,
  79
  80        TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
  81
  82        TP_ARGS(sig, info, ka),
  83
  84        TP_STRUCT__entry(
  85                __field(        int,            sig             )
  86                __field(        int,            errno           )
  87                __field(        int,            code            )
  88                __field(        unsigned long,  sa_handler      )
  89                __field(        unsigned long,  sa_flags        )
  90        ),
  91
  92        TP_fast_assign(
  93                __entry->sig    = sig;
  94                TP_STORE_SIGINFO(__entry, info);
  95                __entry->sa_handler     = (unsigned long)ka->sa.sa_handler;
  96                __entry->sa_flags       = ka->sa.sa_flags;
  97        ),
  98
  99        TP_printk("sig=%d errno=%d code=%d sa_handler=%lx sa_flags=%lx",
 100                  __entry->sig, __entry->errno, __entry->code,
 101                  __entry->sa_handler, __entry->sa_flags)
 102);
 103
 104DECLARE_EVENT_CLASS(signal_queue_overflow,
 105
 106        TP_PROTO(int sig, int group, struct siginfo *info),
 107
 108        TP_ARGS(sig, group, info),
 109
 110        TP_STRUCT__entry(
 111                __field(        int,    sig     )
 112                __field(        int,    group   )
 113                __field(        int,    errno   )
 114                __field(        int,    code    )
 115        ),
 116
 117        TP_fast_assign(
 118                __entry->sig    = sig;
 119                __entry->group  = group;
 120                TP_STORE_SIGINFO(__entry, info);
 121        ),
 122
 123        TP_printk("sig=%d group=%d errno=%d code=%d",
 124                  __entry->sig, __entry->group, __entry->errno, __entry->code)
 125);
 126
 127/**
 128 * signal_overflow_fail - called when signal queue is overflow
 129 * @sig: signal number
 130 * @group: signal to process group or not (bool)
 131 * @info: pointer to struct siginfo
 132 *
 133 * Kernel fails to generate 'sig' signal with 'info' siginfo, because
 134 * siginfo queue is overflow, and the signal is dropped.
 135 * 'group' is not 0 if the signal will be sent to a process group.
 136 * 'sig' is always one of RT signals.
 137 */
 138DEFINE_EVENT(signal_queue_overflow, signal_overflow_fail,
 139
 140        TP_PROTO(int sig, int group, struct siginfo *info),
 141
 142        TP_ARGS(sig, group, info)
 143);
 144
 145/**
 146 * signal_lose_info - called when siginfo is lost
 147 * @sig: signal number
 148 * @group: signal to process group or not (bool)
 149 * @info: pointer to struct siginfo
 150 *
 151 * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
 152 * queue is overflow.
 153 * 'group' is not 0 if the signal will be sent to a process group.
 154 * 'sig' is always one of non-RT signals.
 155 */
 156DEFINE_EVENT(signal_queue_overflow, signal_lose_info,
 157
 158        TP_PROTO(int sig, int group, struct siginfo *info),
 159
 160        TP_ARGS(sig, group, info)
 161);
 162
 163#endif /* _TRACE_SIGNAL_H */
 164
 165/* This part must be outside protection */
 166#include <trace/define_trace.h>
 167