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 15 #include "trace/generated-events.h" 16 17 18 void st_print_trace_file_status(FILE *stream, fprintf_function stream_printf); 19 void st_set_trace_file_enabled(bool enable); 20 void st_set_trace_file(const char *file); 21 bool st_init(void); 22 void st_flush_trace_buffer(void); 23 24 typedef struct { 25 unsigned int tbuf_idx; 26 unsigned int rec_off; 27 } TraceBufferRecord; 28 29 /* Note for hackers: Make sure MAX_TRACE_LEN < sizeof(uint32_t) */ 30 #define MAX_TRACE_STRLEN 512 31 /** 32 * Initialize a trace record and claim space for it in the buffer 33 * 34 * @arglen number of bytes required for arguments 35 */ 36 int trace_record_start(TraceBufferRecord *rec, TraceEventID id, size_t arglen); 37 38 /** 39 * Append a 64-bit argument to a trace record 40 */ 41 void trace_record_write_u64(TraceBufferRecord *rec, uint64_t val); 42 43 /** 44 * Append a string argument to a trace record 45 */ 46 void trace_record_write_str(TraceBufferRecord *rec, const char *s, uint32_t slen); 47 48 /** 49 * Mark a trace record completed 50 * 51 * Don't append any more arguments to the trace record after calling this. 52 */ 53 void trace_record_finish(TraceBufferRecord *rec); 54 55 #endif /* TRACE_SIMPLE_H */ 56