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