1 #include <stdio.h> 2 #include <unistd.h> 3 #include <stdlib.h> 4 #include <sys/types.h> 5 #include <sys/stat.h> 6 #include <fcntl.h> 7 #include "tests.h" 8 #include "debugfs.h" 9 10 int trace_event__id(const char *evname) 11 { 12 char *filename; 13 int err = -1, fd; 14 15 if (asprintf(&filename, 16 "%s/syscalls/%s/id", 17 tracing_events_path, evname) < 0) 18 return -1; 19 20 fd = open(filename, O_RDONLY); 21 if (fd >= 0) { 22 char id[16]; 23 if (read(fd, id, sizeof(id)) > 0) 24 err = atoi(id); 25 close(fd); 26 } 27 28 free(filename); 29 return err; 30 } 31