1 /* 2 * Interface for configuring and controlling the state of tracing events. 3 * 4 * Copyright (C) 2011 Lluís Vilanova <vilanova@ac.upc.edu> 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 #include "trace/control.h" 11 12 13 void trace_backend_init_events(const char *fname) 14 { 15 if (fname == NULL) { 16 return; 17 } 18 19 FILE *fp = fopen(fname, "r"); 20 if (!fp) { 21 fprintf(stderr, "error: could not open trace events file '%s': %s\n", 22 fname, strerror(errno)); 23 exit(1); 24 } 25 char line_buf[1024]; 26 while (fgets(line_buf, sizeof(line_buf), fp)) { 27 size_t len = strlen(line_buf); 28 if (len > 1) { /* skip empty lines */ 29 line_buf[len - 1] = '\0'; 30 if ('#' == line_buf[0]) { /* skip commented lines */ 31 continue; 32 } 33 if (!trace_event_set_state(line_buf, true)) { 34 fprintf(stderr, 35 "error: trace event '%s' does not exist\n", line_buf); 36 exit(1); 37 } 38 } 39 } 40 if (fclose(fp) != 0) { 41 fprintf(stderr, "error: closing file '%s': %s\n", 42 fname, strerror(errno)); 43 exit(1); 44 } 45 } 46