94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/*
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* Apple // emulator for *ix
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*
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* This software package is subject to the GNU General Public License
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* version 3 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* Copyright 2013-2015 Aaron Culliney
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*
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*/
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#if !defined(__linux__) || defined(NDEBUG)
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// Linux tracing should not be enabled for release builds
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#else
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#include "common.h"
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#include "trace.h"
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#define MAX_MSG_LEN 1024
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#define MAX_ARG_LEN 768
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#define TRACING_FILE "/sys/kernel/debug/tracing/trace_marker"
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#define FMT_TRACE_BEGIN "B|%d|%s"
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#define FMT_TRACE_COUNT_BEGIN "C|%d|%s|%d"
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static int trace_fd = -1;
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static int trace_pid = -1;
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__attribute__((constructor(CTOR_PRIORITY_LATE)))
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static void _trace_init(void) {
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TEMP_FAILURE_RETRY(trace_fd = open(TRACING_FILE, O_WRONLY));
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if (trace_fd == -1) {
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ERRLOG("Could not open kernel trace file");
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} else {
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LOG("Initialized Linux tracing facility");
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}
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trace_pid = getpid();
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}
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__attribute__((destructor(255)))
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static void _trace_shutdown(void) {
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if (trace_fd != -1) {
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TEMP_FAILURE_RETRY(close(trace_fd));
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trace_fd = -1;
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}
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}
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void trace_begin(const char *fmt, ...) {
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if (trace_fd == -1) {
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return;
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}
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va_list args;
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va_start(args, fmt);
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char args_buf[MAX_ARG_LEN] = { 0 };
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vsnprintf(args_buf, MAX_ARG_LEN, fmt, args);
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va_end(args);
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char buf[MAX_MSG_LEN] = { 0 };
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size_t length = snprintf(buf, MAX_MSG_LEN, FMT_TRACE_BEGIN, trace_pid, args_buf);
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TEMP_FAILURE_RETRY(write(trace_fd, buf, length));
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}
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void trace_begin_count(uint32_t count, const char *fmt, ...) {
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if (trace_fd == -1) {
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return;
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}
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va_list args;
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va_start(args, fmt);
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char args_buf[MAX_ARG_LEN] = { 0 };
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vsnprintf(args_buf, MAX_ARG_LEN, fmt, args);
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va_end(args);
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char buf[MAX_MSG_LEN] = { 0 };
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size_t length = snprintf(buf, MAX_MSG_LEN, FMT_TRACE_COUNT_BEGIN, trace_pid, args_buf, count);
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TEMP_FAILURE_RETRY(write(trace_fd, buf, length));
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}
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void trace_end(void) {
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if (trace_fd == -1) {
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return;
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}
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TEMP_FAILURE_RETRY(write(trace_fd, "E", 1));
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}
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void _trace_cleanup(void *token) {
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trace_end();
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}
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#endif // whole file
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