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