X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=include%2Finstrumentation%2Fevents%2Fsignal.h;fp=include%2Finstrumentation%2Fevents%2Fsignal.h;h=4a71d14b917aa83f86d67ef21146fd87228f2771;hb=4f47ccf08dfac3d5db7553eb8b40bdab19764727;hp=0000000000000000000000000000000000000000;hpb=2bc89292c6ac6030a7498a798671cca921ae61df;p=lttng-modules.git diff --git a/include/instrumentation/events/signal.h b/include/instrumentation/events/signal.h new file mode 100644 index 00000000..4a71d14b --- /dev/null +++ b/include/instrumentation/events/signal.h @@ -0,0 +1,202 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM signal + +#if !defined(LTTNG_TRACE_SIGNAL_H) || defined(TRACE_HEADER_MULTI_READ) +#define LTTNG_TRACE_SIGNAL_H + +#include +#include + +#ifndef _TRACE_SIGNAL_DEF +#define _TRACE_SIGNAL_DEF +#include +#include +#undef LTTNG_FIELDS_SIGINFO +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0) || \ + LTTNG_RHEL_KERNEL_RANGE(4,18,0,147,0,0, 4,19,0,0,0,0)) +#define LTTNG_FIELDS_SIGINFO(info) \ + ctf_integer(int, errno, \ + (info == SEND_SIG_NOINFO || info == SEND_SIG_PRIV) ? \ + 0 : \ + info->si_errno) \ + ctf_integer(int, code, \ + (info == SEND_SIG_NOINFO) ? \ + SI_USER : \ + ((info == SEND_SIG_PRIV) ? SI_KERNEL : info->si_code)) +#else /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0) */ +#define LTTNG_FIELDS_SIGINFO(info) \ + ctf_integer(int, errno, \ + (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED || info == SEND_SIG_PRIV) ? \ + 0 : \ + info->si_errno) \ + ctf_integer(int, code, \ + (info == SEND_SIG_NOINFO || info == SEND_SIG_FORCED) ? \ + SI_USER : \ + ((info == SEND_SIG_PRIV) ? SI_KERNEL : info->si_code)) +#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0) */ +#endif /* _TRACE_SIGNAL_DEF */ + +/** + * signal_generate - called when a signal is generated + * @sig: signal number + * @info: pointer to struct siginfo + * @task: pointer to struct task_struct + * + * Current process sends a 'sig' signal to 'task' process with + * 'info' siginfo. If 'info' is SEND_SIG_NOINFO or SEND_SIG_PRIV, + * 'info' is not a pointer and you can't access its field. Instead, + * SEND_SIG_NOINFO means that si_code is SI_USER, and SEND_SIG_PRIV + * means that si_code is SI_KERNEL. + */ +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0) || \ + LTTNG_RHEL_KERNEL_RANGE(4,18,0,147,0,0, 4,19,0,0,0,0)) +LTTNG_TRACEPOINT_EVENT(signal_generate, + + TP_PROTO(int sig, struct kernel_siginfo *info, struct task_struct *task, + int group, int result), + + TP_ARGS(sig, info, task, group, result), + + TP_FIELDS( + ctf_integer(int, sig, sig) + LTTNG_FIELDS_SIGINFO(info) + ctf_array_text(char, comm, task->comm, TASK_COMM_LEN) + ctf_integer(pid_t, pid, task->pid) + ctf_integer(int, group, group) + ctf_integer(int, result, result) + ) +) +#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) +LTTNG_TRACEPOINT_EVENT(signal_generate, + + TP_PROTO(int sig, struct siginfo *info, struct task_struct *task, + int group, int result), + + TP_ARGS(sig, info, task, group, result), + + TP_FIELDS( + ctf_integer(int, sig, sig) + LTTNG_FIELDS_SIGINFO(info) + ctf_array_text(char, comm, task->comm, TASK_COMM_LEN) + ctf_integer(pid_t, pid, task->pid) + ctf_integer(int, group, group) + ctf_integer(int, result, result) + ) +) +#else +LTTNG_TRACEPOINT_EVENT(signal_generate, + + TP_PROTO(int sig, struct siginfo *info, struct task_struct *task), + + TP_ARGS(sig, info, task), + + TP_FIELDS( + ctf_integer(int, sig, sig) + LTTNG_FIELDS_SIGINFO(info) + ctf_array_text(char, comm, task->comm, TASK_COMM_LEN) + ctf_integer(pid_t, pid, task->pid) + ) +) +#endif + +/** + * signal_deliver - called when a signal is delivered + * @sig: signal number + * @info: pointer to struct siginfo + * @ka: pointer to struct k_sigaction + * + * A 'sig' signal is delivered to current process with 'info' siginfo, + * and it will be handled by 'ka'. ka->sa.sa_handler can be SIG_IGN or + * SIG_DFL. + * Note that some signals reported by signal_generate tracepoint can be + * lost, ignored or modified (by debugger) before hitting this tracepoint. + * This means, this can show which signals are actually delivered, but + * matching generated signals and delivered signals may not be correct. + */ +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,20,0) || \ + LTTNG_RHEL_KERNEL_RANGE(4,18,0,147,0,0, 4,19,0,0,0,0)) +LTTNG_TRACEPOINT_EVENT(signal_deliver, + + TP_PROTO(int sig, struct kernel_siginfo *info, struct k_sigaction *ka), + + TP_ARGS(sig, info, ka), + + TP_FIELDS( + ctf_integer(int, sig, sig) + LTTNG_FIELDS_SIGINFO(info) + ctf_integer(unsigned long, sa_handler, (unsigned long) ka->sa.sa_handler) + ctf_integer(unsigned long, sa_flags, ka->sa.sa_flags) + ) +) +#else +LTTNG_TRACEPOINT_EVENT(signal_deliver, + + TP_PROTO(int sig, struct siginfo *info, struct k_sigaction *ka), + + TP_ARGS(sig, info, ka), + + TP_FIELDS( + ctf_integer(int, sig, sig) + LTTNG_FIELDS_SIGINFO(info) + ctf_integer(unsigned long, sa_handler, (unsigned long) ka->sa.sa_handler) + ctf_integer(unsigned long, sa_flags, ka->sa.sa_flags) + ) +) +#endif + +#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,4,0)) +LTTNG_TRACEPOINT_EVENT_CLASS(signal_queue_overflow, + + TP_PROTO(int sig, int group, struct siginfo *info), + + TP_ARGS(sig, group, info), + + TP_FIELDS( + ctf_integer(int, sig, sig) + ctf_integer(int, group, group) + LTTNG_FIELDS_SIGINFO(info) + ) +) + +/** + * signal_overflow_fail - called when signal queue is overflow + * @sig: signal number + * @group: signal to process group or not (bool) + * @info: pointer to struct siginfo + * + * Kernel fails to generate 'sig' signal with 'info' siginfo, because + * siginfo queue is overflow, and the signal is dropped. + * 'group' is not 0 if the signal will be sent to a process group. + * 'sig' is always one of RT signals. + */ +LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow, signal_overflow_fail, + + TP_PROTO(int sig, int group, struct siginfo *info), + + TP_ARGS(sig, group, info) +) + +/** + * signal_lose_info - called when siginfo is lost + * @sig: signal number + * @group: signal to process group or not (bool) + * @info: pointer to struct siginfo + * + * Kernel generates 'sig' signal but loses 'info' siginfo, because siginfo + * queue is overflow. + * 'group' is not 0 if the signal will be sent to a process group. + * 'sig' is always one of non-RT signals. + */ +LTTNG_TRACEPOINT_EVENT_INSTANCE(signal_queue_overflow, signal_lose_info, + + TP_PROTO(int sig, int group, struct siginfo *info), + + TP_ARGS(sig, group, info) +) +#endif + +#endif /* LTTNG_TRACE_SIGNAL_H */ + +/* This part must be outside protection */ +#include