1 #include "../perf.h" 2 #include "util.h" 3 #include <sys/mman.h> 4 #ifdef BACKTRACE_SUPPORT 5 #include <execinfo.h> 6 #endif 7 #include <stdio.h> 8 #include <stdlib.h> 9 10 /* 11 * XXX We need to find a better place for these things... 12 */ 13 unsigned int page_size; 14 15 bool test_attr__enabled; 16 17 bool perf_host = true; 18 bool perf_guest = false; 19 20 char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events"; 21 22 void event_attr_init(struct perf_event_attr *attr) 23 { 24 if (!perf_host) 25 attr->exclude_host = 1; 26 if (!perf_guest) 27 attr->exclude_guest = 1; 28 /* to capture ABI version */ 29 attr->size = sizeof(*attr); 30 } 31 32 int mkdir_p(char *path, mode_t mode) 33 { 34 struct stat st; 35 int err; 36 char *d = path; 37 38 if (*d != '/') 39 return -1; 40 41 if (stat(path, &st) == 0) 42 return 0; 43 44 while (*++d == '/'); 45 46 while ((d = strchr(d, '/'))) { 47 *d = '\0'; 48 err = stat(path, &st) && mkdir(path, mode); 49 *d++ = '/'; 50 if (err) 51 return -1; 52 while (*d == '/') 53 ++d; 54 } 55 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0; 56 } 57 58 static int slow_copyfile(const char *from, const char *to) 59 { 60 int err = 0; 61 char *line = NULL; 62 size_t n; 63 FILE *from_fp = fopen(from, "r"), *to_fp; 64 65 if (from_fp == NULL) 66 goto out; 67 68 to_fp = fopen(to, "w"); 69 if (to_fp == NULL) 70 goto out_fclose_from; 71 72 while (getline(&line, &n, from_fp) > 0) 73 if (fputs(line, to_fp) == EOF) 74 goto out_fclose_to; 75 err = 0; 76 out_fclose_to: 77 fclose(to_fp); 78 free(line); 79 out_fclose_from: 80 fclose(from_fp); 81 out: 82 return err; 83 } 84 85 int copyfile(const char *from, const char *to) 86 { 87 int fromfd, tofd; 88 struct stat st; 89 void *addr; 90 int err = -1; 91 92 if (stat(from, &st)) 93 goto out; 94 95 if (st.st_size == 0) /* /proc? do it slowly... */ 96 return slow_copyfile(from, to); 97 98 fromfd = open(from, O_RDONLY); 99 if (fromfd < 0) 100 goto out; 101 102 tofd = creat(to, 0755); 103 if (tofd < 0) 104 goto out_close_from; 105 106 addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0); 107 if (addr == MAP_FAILED) 108 goto out_close_to; 109 110 if (write(tofd, addr, st.st_size) == st.st_size) 111 err = 0; 112 113 munmap(addr, st.st_size); 114 out_close_to: 115 close(tofd); 116 if (err) 117 unlink(to); 118 out_close_from: 119 close(fromfd); 120 out: 121 return err; 122 } 123 124 unsigned long convert_unit(unsigned long value, char *unit) 125 { 126 *unit = ' '; 127 128 if (value > 1000) { 129 value /= 1000; 130 *unit = 'K'; 131 } 132 133 if (value > 1000) { 134 value /= 1000; 135 *unit = 'M'; 136 } 137 138 if (value > 1000) { 139 value /= 1000; 140 *unit = 'G'; 141 } 142 143 return value; 144 } 145 146 int readn(int fd, void *buf, size_t n) 147 { 148 void *buf_start = buf; 149 150 while (n) { 151 int ret = read(fd, buf, n); 152 153 if (ret <= 0) 154 return ret; 155 156 n -= ret; 157 buf += ret; 158 } 159 160 return buf - buf_start; 161 } 162 163 size_t hex_width(u64 v) 164 { 165 size_t n = 1; 166 167 while ((v >>= 4)) 168 ++n; 169 170 return n; 171 } 172 173 static int hex(char ch) 174 { 175 if ((ch >= '0') && (ch <= '9')) 176 return ch - '0'; 177 if ((ch >= 'a') && (ch <= 'f')) 178 return ch - 'a' + 10; 179 if ((ch >= 'A') && (ch <= 'F')) 180 return ch - 'A' + 10; 181 return -1; 182 } 183 184 /* 185 * While we find nice hex chars, build a long_val. 186 * Return number of chars processed. 187 */ 188 int hex2u64(const char *ptr, u64 *long_val) 189 { 190 const char *p = ptr; 191 *long_val = 0; 192 193 while (*p) { 194 const int hex_val = hex(*p); 195 196 if (hex_val < 0) 197 break; 198 199 *long_val = (*long_val << 4) | hex_val; 200 p++; 201 } 202 203 return p - ptr; 204 } 205 206 /* Obtain a backtrace and print it to stdout. */ 207 #ifdef BACKTRACE_SUPPORT 208 void dump_stack(void) 209 { 210 void *array[16]; 211 size_t size = backtrace(array, ARRAY_SIZE(array)); 212 char **strings = backtrace_symbols(array, size); 213 size_t i; 214 215 printf("Obtained %zd stack frames.\n", size); 216 217 for (i = 0; i < size; i++) 218 printf("%s\n", strings[i]); 219 220 free(strings); 221 } 222 #else 223 void dump_stack(void) {} 224 #endif 225 226 void get_term_dimensions(struct winsize *ws) 227 { 228 char *s = getenv("LINES"); 229 230 if (s != NULL) { 231 ws->ws_row = atoi(s); 232 s = getenv("COLUMNS"); 233 if (s != NULL) { 234 ws->ws_col = atoi(s); 235 if (ws->ws_row && ws->ws_col) 236 return; 237 } 238 } 239 #ifdef TIOCGWINSZ 240 if (ioctl(1, TIOCGWINSZ, ws) == 0 && 241 ws->ws_row && ws->ws_col) 242 return; 243 #endif 244 ws->ws_row = 25; 245 ws->ws_col = 80; 246 } 247 248 static void set_tracing_events_path(const char *mountpoint) 249 { 250 snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s", 251 mountpoint, "tracing/events"); 252 } 253 254 const char *perf_debugfs_mount(const char *mountpoint) 255 { 256 const char *mnt; 257 258 mnt = debugfs_mount(mountpoint); 259 if (!mnt) 260 return NULL; 261 262 set_tracing_events_path(mnt); 263 264 return mnt; 265 } 266 267 void perf_debugfs_set_path(const char *mntpt) 268 { 269 snprintf(debugfs_mountpoint, strlen(debugfs_mountpoint), "%s", mntpt); 270 set_tracing_events_path(mntpt); 271 } 272 273 static const char *find_debugfs(void) 274 { 275 const char *path = perf_debugfs_mount(NULL); 276 277 if (!path) 278 fprintf(stderr, "Your kernel does not support the debugfs filesystem"); 279 280 return path; 281 } 282 283 /* 284 * Finds the path to the debugfs/tracing 285 * Allocates the string and stores it. 286 */ 287 const char *find_tracing_dir(void) 288 { 289 static char *tracing; 290 static int tracing_found; 291 const char *debugfs; 292 293 if (tracing_found) 294 return tracing; 295 296 debugfs = find_debugfs(); 297 if (!debugfs) 298 return NULL; 299 300 tracing = malloc(strlen(debugfs) + 9); 301 if (!tracing) 302 return NULL; 303 304 sprintf(tracing, "%s/tracing", debugfs); 305 306 tracing_found = 1; 307 return tracing; 308 } 309 310 char *get_tracing_file(const char *name) 311 { 312 const char *tracing; 313 char *file; 314 315 tracing = find_tracing_dir(); 316 if (!tracing) 317 return NULL; 318 319 file = malloc(strlen(tracing) + strlen(name) + 2); 320 if (!file) 321 return NULL; 322 323 sprintf(file, "%s/%s", tracing, name); 324 return file; 325 } 326 327 void put_tracing_file(char *file) 328 { 329 free(file); 330 } 331 332 int parse_nsec_time(const char *str, u64 *ptime) 333 { 334 u64 time_sec, time_nsec; 335 char *end; 336 337 time_sec = strtoul(str, &end, 10); 338 if (*end != '.' && *end != '\0') 339 return -1; 340 341 if (*end == '.') { 342 int i; 343 char nsec_buf[10]; 344 345 if (strlen(++end) > 9) 346 return -1; 347 348 strncpy(nsec_buf, end, 9); 349 nsec_buf[9] = '\0'; 350 351 /* make it nsec precision */ 352 for (i = strlen(nsec_buf); i < 9; i++) 353 nsec_buf[i] = '0'; 354 355 time_nsec = strtoul(nsec_buf, &end, 10); 356 if (*end != '\0') 357 return -1; 358 } else 359 time_nsec = 0; 360 361 *ptime = time_sec * NSEC_PER_SEC + time_nsec; 362 return 0; 363 } 364
