instrumentation/events/lttng-module/signal.h

   1 #undef TRACE_SYSTEM
   2 #define TRACE_SYSTEM signal
   3
   4 #if !defined(LTTNG_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
   5 #define LTTNG_TRACE_SIGNAL_H
   6
   7 #include "../../../probes/lttng-tracepoint-event.h"
   8 #include <linux/version.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_FORCED || info == SEND_SIG_PRIV) ? \
  18                         0 :                                     \
  19                         info->si_errno)                         \
  20                 ctf_integer(int, code,                          \
  21                         (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED) ? \
  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 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
  39 LTTNG_TRACEPOINT_EVENT(signal_generate,
  40
  41         TP_PROTO(int sig, struct siginfo *info, struct task_struct *task),
  42
  43         TP_ARGS(sig, info, task),
  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         )
  51 )
  52 #else
  53 LTTNG_TRACEPOINT_EVENT(signal_generate,
  54
  55         TP_PROTO(int sig, struct siginfo *info, struct task_struct *task,
  56                         int group, int result),
  57
  58         TP_ARGS(sig, info, task, group, result),
  59
  60         TP_FIELDS(
  61                 ctf_integer(int, sig, sig)
  62                 LTTNG_FIELDS_SIGINFO(info)
  63                 ctf_array_text(char, comm, task->comm, TASK_COMM_LEN)
  64                 ctf_integer(pid_t, pid, task->pid)
  65                 ctf_integer(int, group, group)
  66                 ctf_integer(int, result, result)
  67         )
  68 )
  69 #endif
  70
  71 /**
  72  * signal_deliver - called when a signal is delivered
  73  * @sig: signal number
  74  * @info: pointer to struct siginfo
  75  * @ka: pointer to struct k_sigaction
  76  *
  77  * A 'sig' signal is delivered to current process with 'info' siginfo,
  78  * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
  79  * SIG_DFL.
  80  * Note that some signals reported by signal_generate tracepoint can be
  81  * lost, ignored or modified (by debugger) before hitting this tracepoint.
  82  * This means, this can show which signals are actually delivered, but
  83  * matching generated signals and delivered signals may not be correct.
  84  */
  85 LTTNG_TRACEPOINT_EVENT(signal_deliver,
  86
  87         TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
  88
  89         TP_ARGS(sig, info, ka),
  90
  91         TP_FIELDS(
  92                 ctf_integer(int, sig, sig)
  93                 LTTNG_FIELDS_SIGINFO(info)
  94                 ctf_integer(unsigned long, sa_handler, (unsigned long) ka->sa.sa_handler)
  95                 ctf_integer(unsigned long, sa_flags, ka->sa.sa_flags)
  96         )
  97 )
  98
  99 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
 100 LTTNG_TRACEPOINT_EVENT_CLASS(signal_queue_overflow,
 101
 102         TP_PROTO(int sig, int group, struct siginfo *info),
 103
 104         TP_ARGS(sig, group, info),
 105
 106         TP_FIELDS(
 107                 ctf_integer(int, sig, sig)
 108                 ctf_integer(int, group, group)
 109                 LTTNG_FIELDS_SIGINFO(info)
 110         )
 111 )
 112
 113 /**
 114  * signal_overflow_fail - called when signal queue is overflow
 115  * @sig: signal number
 116  * @group: signal to process group or not (bool)
 117  * @info: pointer to struct siginfo
 118  *
 119  * Kernel fails to generate 'sig' signal with 'info' siginfo, because
 120  * siginfo queue is overflow, and the signal is dropped.
 121  * 'group' is not 0 if the signal will be sent to a process group.
 122  * 'sig' is always one of RT signals.
 123  */
 124 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow, signal_overflow_fail,
 125
 126         TP_PROTO(int sig, int group, struct siginfo *info),
 127
 128         TP_ARGS(sig, group, info)
 129 )
 130
 131 /**
 132  * signal_lose_info - called when siginfo is lost
 133  * @sig: signal number
 134  * @group: signal to process group or not (bool)
 135  * @info: pointer to struct siginfo
 136  *
 137  * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
 138  * queue is overflow.
 139  * 'group' is not 0 if the signal will be sent to a process group.
 140  * 'sig' is always one of non-RT signals.
 141  */
 142 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow, signal_lose_info,
 143
 144         TP_PROTO(int sig, int group, struct siginfo *info),
 145
 146         TP_ARGS(sig, group, info)
 147 )
 148 #endif
 149
 150 #endif /* LTTNG_TRACE_SIGNAL_H */
 151
 152 /* This part must be outside protection */
 153 #include "../../../probes/define_trace.h"