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5b808275f3
Adds support to compile QEMU with multiple tracing backends at the same time. For example, you can compile QEMU with: $ ./configure --enable-trace-backends=ftrace,dtrace Where 'ftrace' can be handy for having an in-flight record of events, and 'dtrace' can be later used to extract more information from the system. This patch allows having both available without recompiling QEMU. Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/*
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* Simple trace backend
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*
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* Copyright IBM, Corp. 2010
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef TRACE_SIMPLE_H
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#define TRACE_SIMPLE_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include "trace/generated-events.h"
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void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf);
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void st_set_trace_file_enabled(bool enable);
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bool st_set_trace_file(const char *file);
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bool st_init(const char *file);
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void st_flush_trace_buffer(void);
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typedef struct {
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unsigned int tbuf_idx;
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unsigned int rec_off;
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} TraceBufferRecord;
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/* Note for hackers: Make sure MAX_TRACE_LEN < sizeof(uint32_t) */
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#define MAX_TRACE_STRLEN 512
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/**
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* Initialize a trace record and claim space for it in the buffer
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*
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* @arglen number of bytes required for arguments
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*/
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int trace_record_start(TraceBufferRecord *rec, TraceEventID id, size_t arglen);
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/**
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* Append a 64-bit argument to a trace record
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*/
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void trace_record_write_u64(TraceBufferRecord *rec, uint64_t val);
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/**
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* Append a string argument to a trace record
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*/
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void trace_record_write_str(TraceBufferRecord *rec, const char *s, uint32_t slen);
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/**
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* Mark a trace record completed
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*
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* Don't append any more arguments to the trace record after calling this.
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*/
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void trace_record_finish(TraceBufferRecord *rec);
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#endif /* TRACE_SIMPLE_H */
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