instrumentation/events/lttng-module/signal.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #undef TRACE_SYSTEM
   3 #define TRACE_SYSTEM signal
   4
   5 #if !defined(LTTNG_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ)
   6 #define LTTNG_TRACE_SIGNAL_H
   7
   8 #include <probes/lttng-tracepoint-event.h>
   9 #include <linux/version.h>
  10
  11 #ifndef _TRACE_SIGNAL_DEF
  12 #define _TRACE_SIGNAL_DEF
  13 #include <linux/signal.h>
  14 #include <linux/sched.h>
  15 #undef LTTNG_FIELDS_SIGINFO
  16 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0))
  17 #define LTTNG_FIELDS_SIGINFO(info)                              \
  18                 ctf_integer(int, errno,                         \
  19                         (info == SEND_SIG_NOINFO || info == SEND_SIG_PRIV) ? \
  20                         0 :                                     \
  21                         info->si_errno)                         \
  22                 ctf_integer(int, code,                          \
  23                         (info == SEND_SIG_NOINFO) ?             \
  24                         SI_USER :                               \
  25                         ((info == SEND_SIG_PRIV) ? SI_KERNEL : info->si_code))
  26 #else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0) */
  27 #define LTTNG_FIELDS_SIGINFO(info)                              \
  28                 ctf_integer(int, errno,                         \
  29                         (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED || info == SEND_SIG_PRIV) ? \
  30                         0 :                                     \
  31                         info->si_errno)                         \
  32                 ctf_integer(int, code,                          \
  33                         (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED) ? \
  34                         SI_USER :                               \
  35                         ((info == SEND_SIG_PRIV) ? SI_KERNEL : info->si_code))
  36 #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0) */
  37 #endif /* _TRACE_SIGNAL_DEF */
  38
  39 /**
  40  * signal_generate - called when a signal is generated
  41  * @sig: signal number
  42  * @info: pointer to struct siginfo
  43  * @task: pointer to struct task_struct
  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 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0))
  52 LTTNG_TRACEPOINT_EVENT(signal_generate,
  53
  54         TP_PROTO(int sig, struct kernel_siginfo *info, struct task_struct *task,
  55                         int group, int result),
  56
  57         TP_ARGS(sig, info, task, group, result),
  58
  59         TP_FIELDS(
  60                 ctf_integer(int, sig, sig)
  61                 LTTNG_FIELDS_SIGINFO(info)
  62                 ctf_array_text(char, comm, task->comm, TASK_COMM_LEN)
  63                 ctf_integer(pid_t, pid, task->pid)
  64                 ctf_integer(int, group, group)
  65                 ctf_integer(int, result, result)
  66         )
  67 )
  68 #elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
  69 LTTNG_TRACEPOINT_EVENT(signal_generate,
  70
  71         TP_PROTO(int sig, struct siginfo *info, struct task_struct *task,
  72                         int group, int result),
  73
  74         TP_ARGS(sig, info, task, group, result),
  75
  76         TP_FIELDS(
  77                 ctf_integer(int, sig, sig)
  78                 LTTNG_FIELDS_SIGINFO(info)
  79                 ctf_array_text(char, comm, task->comm, TASK_COMM_LEN)
  80                 ctf_integer(pid_t, pid, task->pid)
  81                 ctf_integer(int, group, group)
  82                 ctf_integer(int, result, result)
  83         )
  84 )
  85 #else
  86 LTTNG_TRACEPOINT_EVENT(signal_generate,
  87
  88         TP_PROTO(int sig, struct siginfo *info, struct task_struct *task),
  89
  90         TP_ARGS(sig, info, task),
  91
  92         TP_FIELDS(
  93                 ctf_integer(int, sig, sig)
  94                 LTTNG_FIELDS_SIGINFO(info)
  95                 ctf_array_text(char, comm, task->comm, TASK_COMM_LEN)
  96                 ctf_integer(pid_t, pid, task->pid)
  97         )
  98 )
  99 #endif
 100
 101 /**
 102  * signal_deliver - called when a signal is delivered
 103  * @sig: signal number
 104  * @info: pointer to struct siginfo
 105  * @ka: pointer to struct k_sigaction
 106  *
 107  * A 'sig' signal is delivered to current process with 'info' siginfo,
 108  * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or
 109  * SIG_DFL.
 110  * Note that some signals reported by signal_generate tracepoint can be
 111  * lost, ignored or modified (by debugger) before hitting this tracepoint.
 112  * This means, this can show which signals are actually delivered, but
 113  * matching generated signals and delivered signals may not be correct.
 114  */
 115 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0))
 116 LTTNG_TRACEPOINT_EVENT(signal_deliver,
 117
 118         TP_PROTO(int sig, struct kernel_siginfo *info, struct k_sigaction *ka),
 119
 120         TP_ARGS(sig, info, ka),
 121
 122         TP_FIELDS(
 123                 ctf_integer(int, sig, sig)
 124                 LTTNG_FIELDS_SIGINFO(info)
 125                 ctf_integer(unsigned long, sa_handler, (unsigned long) ka->sa.sa_handler)
 126                 ctf_integer(unsigned long, sa_flags, ka->sa.sa_flags)
 127         )
 128 )
 129 #else
 130 LTTNG_TRACEPOINT_EVENT(signal_deliver,
 131
 132         TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka),
 133
 134         TP_ARGS(sig, info, ka),
 135
 136         TP_FIELDS(
 137                 ctf_integer(int, sig, sig)
 138                 LTTNG_FIELDS_SIGINFO(info)
 139                 ctf_integer(unsigned long, sa_handler, (unsigned long) ka->sa.sa_handler)
 140                 ctf_integer(unsigned long, sa_flags, ka->sa.sa_flags)
 141         )
 142 )
 143 #endif
 144
 145 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0))
 146 LTTNG_TRACEPOINT_EVENT_CLASS(signal_queue_overflow,
 147
 148         TP_PROTO(int sig, int group, struct siginfo *info),
 149
 150         TP_ARGS(sig, group, info),
 151
 152         TP_FIELDS(
 153                 ctf_integer(int, sig, sig)
 154                 ctf_integer(int, group, group)
 155                 LTTNG_FIELDS_SIGINFO(info)
 156         )
 157 )
 158
 159 /**
 160  * signal_overflow_fail - called when signal queue is overflow
 161  * @sig: signal number
 162  * @group: signal to process group or not (bool)
 163  * @info: pointer to struct siginfo
 164  *
 165  * Kernel fails to generate 'sig' signal with 'info' siginfo, because
 166  * siginfo queue is overflow, and the signal is dropped.
 167  * 'group' is not 0 if the signal will be sent to a process group.
 168  * 'sig' is always one of RT signals.
 169  */
 170 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow, signal_overflow_fail,
 171
 172         TP_PROTO(int sig, int group, struct siginfo *info),
 173
 174         TP_ARGS(sig, group, info)
 175 )
 176
 177 /**
 178  * signal_lose_info - called when siginfo is lost
 179  * @sig: signal number
 180  * @group: signal to process group or not (bool)
 181  * @info: pointer to struct siginfo
 182  *
 183  * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo
 184  * queue is overflow.
 185  * 'group' is not 0 if the signal will be sent to a process group.
 186  * 'sig' is always one of non-RT signals.
 187  */
 188 LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow, signal_lose_info,
 189
 190         TP_PROTO(int sig, int group, struct siginfo *info),
 191
 192         TP_ARGS(sig, group, info)
 193 )
 194 #endif
 195
 196 #endif /* LTTNG_TRACE_SIGNAL_H */
 197
 198 /* This part must be outside protection */
 199 #include <probes/define_trace.h>