112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
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/*
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* trace.c
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*
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* Created on: 2019年3月20日
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* Author: tao
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <pthread.h>
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#include <stdatomic.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <inttypes.h>
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#include <sys/types.h>
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#define ATRACE_MESSAGE_LENGTH 1024
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#define WRITE_MSG(format_begin, format_end, name, value) { \
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char buf[ATRACE_MESSAGE_LENGTH]; \
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int pid = gettid(); \
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int len = snprintf(buf, sizeof(buf), format_begin "%s" format_end, pid, \
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name, value); \
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if (len >= (int) sizeof(buf)) { \
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/* Given the sizeof(buf), and all of the current format buffers, \
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* it is impossible for name_len to be < 0 if len >= sizeof(buf). */ \
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int name_len = strlen(name) - (len - sizeof(buf)) - 1; \
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/* Truncate the name to make the message fit. */ \
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len = snprintf(buf, sizeof(buf), format_begin "%.*s" format_end, pid, \
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name_len, name, value); \
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} \
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write(atrace_marker_fd, buf, len); \
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}
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#ifndef atomic_store_explicit
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#define atomic_store_explicit(PTR, VAL, MO) \
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__extension__ \
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({ \
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__auto_type __atomic_store_ptr = (PTR); \
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__typeof__ (*__atomic_store_ptr) __atomic_store_tmp = (VAL); \
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__atomic_store (__atomic_store_ptr, &__atomic_store_tmp, (MO)); \
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})
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#endif
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int atrace_marker_fd = -1;
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atomic_bool atrace_is_ready = ATOMIC_VAR_INIT(false);
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static pthread_once_t atrace_once_control = PTHREAD_ONCE_INIT;
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static void atrace_init_once()
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{
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atrace_marker_fd = open("/sys/kernel/debug/tracing/trace_marker", O_WRONLY | O_CLOEXEC);
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if (atrace_marker_fd == -1) {
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fprintf(stdout, "open failed, errno=%d: %s\n", errno, strerror(errno));
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goto done;
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}
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done:
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atomic_store_explicit(&atrace_is_ready, true, memory_order_release);
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}
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void __attribute__((constructor)) atrace_setup()
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{
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pthread_once(&atrace_once_control, atrace_init_once);
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}
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void atrace_begin_body(const char* name)
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{
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WRITE_MSG("B|%d|", "%s", name, "");
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}
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void atrace_end_body()
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{
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WRITE_MSG("E|%d", "%s", "", "");
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}
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void atrace_async_begin_body(const char* name, int32_t cookie)
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{
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WRITE_MSG("S|%d|", "|%" PRId32, name, cookie);
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}
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void atrace_async_end_body(const char* name, int32_t cookie)
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{
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WRITE_MSG("F|%d|", "|%" PRId32, name, cookie);
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}
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void atrace_int_body(const char* name, int32_t value)
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{
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WRITE_MSG("C|%d|", "|%" PRId32, name, value);
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}
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void atrace_int64_body(const char* name, int64_t value)
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{
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WRITE_MSG("C|%d|", "|%" PRId64, name, value);
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}
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void atrace_uint_body(const char* name, uint32_t value)
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{
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WRITE_MSG("C|%d|", "|%" PRIu32, name, value);
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}
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void atrace_uint64_body(const char* name, uint64_t value)
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{
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WRITE_MSG("C|%d|", "|%" PRIu64, name, value);
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}
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