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