simple.h (1304B)
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_init_group(size_t group); 19 void st_flush_trace_buffer(void); 20 21 typedef struct { 22 unsigned int tbuf_idx; 23 unsigned int rec_off; 24 } TraceBufferRecord; 25 26 /* Note for hackers: Make sure MAX_TRACE_LEN < sizeof(uint32_t) */ 27 #define MAX_TRACE_STRLEN 512 28 /** 29 * Initialize a trace record and claim space for it in the buffer 30 * 31 * @arglen number of bytes required for arguments 32 */ 33 int trace_record_start(TraceBufferRecord *rec, uint32_t id, size_t arglen); 34 35 /** 36 * Append a 64-bit argument to a trace record 37 */ 38 void trace_record_write_u64(TraceBufferRecord *rec, uint64_t val); 39 40 /** 41 * Append a string argument to a trace record 42 */ 43 void trace_record_write_str(TraceBufferRecord *rec, const char *s, uint32_t slen); 44 45 /** 46 * Mark a trace record completed 47 * 48 * Don't append any more arguments to the trace record after calling this. 49 */ 50 void trace_record_finish(TraceBufferRecord *rec); 51 52 #endif /* TRACE_SIMPLE_H */