1 /* 2 * Simple trace backend 3 * 4 * Copyright IBM, Corp. 2010 5 * 6 * This work is licensed under the terms of the GNU GPL, version 2. See 7 * the COPYING file in the top-level directory. 8 * 9 */ 10 11 #ifndef TRACE_SIMPLE_H 12 #define TRACE_SIMPLE_H 13 14 #include <stdint.h> 15 #include <stdbool.h> 16 #include <stdio.h> 17 18 #include "trace/generated-events.h" 19 20 21 void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf); 22 void st_set_trace_file_enabled(bool enable); 23 bool st_set_trace_file(const char *file); 24 void st_flush_trace_buffer(void); 25 26 typedef struct { 27 unsigned int tbuf_idx; 28 unsigned int rec_off; 29 } TraceBufferRecord; 30 31 /* Note for hackers: Make sure MAX_TRACE_LEN < sizeof(uint32_t) */ 32 #define MAX_TRACE_STRLEN 512 33 /** 34 * Initialize a trace record and claim space for it in the buffer 35 * 36 * @arglen number of bytes required for arguments 37 */ 38 int trace_record_start(TraceBufferRecord *rec, TraceEventID id, size_t arglen); 39 40 /** 41 * Append a 64-bit argument to a trace record 42 */ 43 void trace_record_write_u64(TraceBufferRecord *rec, uint64_t val); 44 45 /** 46 * Append a string argument to a trace record 47 */ 48 void trace_record_write_str(TraceBufferRecord *rec, const char *s, uint32_t slen); 49 50 /** 51 * Mark a trace record completed 52 * 53 * Don't append any more arguments to the trace record after calling this. 54 */ 55 void trace_record_finish(TraceBufferRecord *rec); 56 57 #endif /* TRACE_SIMPLE_H */ 58