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 typedef uint64_t TraceEventID; 19 20 typedef struct { 21 const char *tp_name; 22 bool state; 23 } TraceEvent; 24 25 void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf); 26 void st_set_trace_file_enabled(bool enable); 27 bool st_set_trace_file(const char *file); 28 void st_flush_trace_buffer(void); 29 30 typedef struct { 31 unsigned int tbuf_idx; 32 unsigned int rec_off; 33 } TraceBufferRecord; 34 35 /* Note for hackers: Make sure MAX_TRACE_LEN < sizeof(uint32_t) */ 36 #define MAX_TRACE_STRLEN 512 37 /** 38 * Initialize a trace record and claim space for it in the buffer 39 * 40 * @arglen number of bytes required for arguments 41 */ 42 int trace_record_start(TraceBufferRecord *rec, TraceEventID id, size_t arglen); 43 44 /** 45 * Append a 64-bit argument to a trace record 46 */ 47 void trace_record_write_u64(TraceBufferRecord *rec, uint64_t val); 48 49 /** 50 * Append a string argument to a trace record 51 */ 52 void trace_record_write_str(TraceBufferRecord *rec, const char *s, uint32_t slen); 53 54 /** 55 * Mark a trace record completed 56 * 57 * Don't append any more arguments to the trace record after calling this. 58 */ 59 void trace_record_finish(TraceBufferRecord *rec); 60 61 #endif /* TRACE_SIMPLE_H */ 62