tools/perf/util/dso.c

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This source file includes following definitions.
dso__symtab_origin
dso__read_binary_type_filename
is_supported_compression
is_kernel_module
dso__needs_decompress
decompress_kmodule
dso__decompress_kmodule_fd
dso__decompress_kmodule_path
__kmod_path__parse
dso__set_module_info
dso__list_add
dso__list_del
do_open
__open_dso
open_dso
close_data_fd
close_dso
close_first_dso
get_fd_limit
reset_fd_limit
may_cache_fd
check_data_close
dso__data_close
try_to_open_dso
dso__data_get_fd
dso__data_put_fd
dso__data_status_seen
bpf_read
bpf_size
dso_cache__free
dso_cache__find
dso_cache__insert
dso_cache__memcpy
file_read
dso_cache__read
dso_cache_read
cached_read
file_size
dso__data_file_size
dso__data_size
data_read_offset
dso__data_read_offset
dso__data_read_addr
dso__new_map
machine__findnew_kernel
dso__set_long_name
dso__set_short_name
dso__name_len
dso__loaded
dso__sorted_by_name
dso__set_sorted_by_name
dso__new
dso__delete
dso__get
dso__put
dso__set_build_id
dso__build_id_equal
dso__read_running_kernel_build_id
dso__kernel_module_get_build_id
dso__fprintf_buildid
dso__fprintf
dso__type
dso__strerror_load
   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <asm/bug.h>
   3 #include <linux/kernel.h>
   4 #include <linux/string.h>
   5 #include <linux/zalloc.h>
   6 #include <sys/time.h>
   7 #include <sys/resource.h>
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <unistd.h>
  11 #include <errno.h>
  12 #include <fcntl.h>
  13 #include <stdlib.h>
  14 #include <bpf/libbpf.h>
  15 #include "bpf-event.h"
  16 #include "compress.h"
  17 #include "env.h"
  18 #include "namespaces.h"
  19 #include "path.h"
  20 #include "map.h"
  21 #include "symbol.h"
  22 #include "srcline.h"
  23 #include "dso.h"
  24 #include "dsos.h"
  25 #include "machine.h"
  26 #include "auxtrace.h"
  27 #include "util.h" /* O_CLOEXEC for older systems */
  28 #include "debug.h"
  29 #include "string2.h"
  30 #include "vdso.h"
  31 
  32 static const char * const debuglink_paths[] = {
  33         "%.0s%s",
  34         "%s/%s",
  35         "%s/.debug/%s",
  36         "/usr/lib/debug%s/%s"
  37 };
  38 
  39 char dso__symtab_origin(const struct dso *dso)
  40 {
  41         static const char origin[] = {
  42                 [DSO_BINARY_TYPE__KALLSYMS]                     = 'k',
  43                 [DSO_BINARY_TYPE__VMLINUX]                      = 'v',
  44                 [DSO_BINARY_TYPE__JAVA_JIT]                     = 'j',
  45                 [DSO_BINARY_TYPE__DEBUGLINK]                    = 'l',
  46                 [DSO_BINARY_TYPE__BUILD_ID_CACHE]               = 'B',
  47                 [DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO]     = 'D',
  48                 [DSO_BINARY_TYPE__FEDORA_DEBUGINFO]             = 'f',
  49                 [DSO_BINARY_TYPE__UBUNTU_DEBUGINFO]             = 'u',
  50                 [DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO]       = 'o',
  51                 [DSO_BINARY_TYPE__BUILDID_DEBUGINFO]            = 'b',
  52                 [DSO_BINARY_TYPE__SYSTEM_PATH_DSO]              = 'd',
  53                 [DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE]          = 'K',
  54                 [DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP]     = 'm',
  55                 [DSO_BINARY_TYPE__GUEST_KALLSYMS]               = 'g',
  56                 [DSO_BINARY_TYPE__GUEST_KMODULE]                = 'G',
  57                 [DSO_BINARY_TYPE__GUEST_KMODULE_COMP]           = 'M',
  58                 [DSO_BINARY_TYPE__GUEST_VMLINUX]                = 'V',
  59         };
  60 
  61         if (dso == NULL || dso->symtab_type == DSO_BINARY_TYPE__NOT_FOUND)
  62                 return '!';
  63         return origin[dso->symtab_type];
  64 }
  65 
  66 int dso__read_binary_type_filename(const struct dso *dso,
  67                                    enum dso_binary_type type,
  68                                    char *root_dir, char *filename, size_t size)
  69 {
  70         char build_id_hex[SBUILD_ID_SIZE];
  71         int ret = 0;
  72         size_t len;
  73 
  74         switch (type) {
  75         case DSO_BINARY_TYPE__DEBUGLINK:
  76         {
  77                 const char *last_slash;
  78                 char dso_dir[PATH_MAX];
  79                 char symfile[PATH_MAX];
  80                 unsigned int i;
  81 
  82                 len = __symbol__join_symfs(filename, size, dso->long_name);
  83                 last_slash = filename + len;
  84                 while (last_slash != filename && *last_slash != '/')
  85                         last_slash--;
  86 
  87                 strncpy(dso_dir, filename, last_slash - filename);
  88                 dso_dir[last_slash-filename] = '\0';
  89 
  90                 if (!is_regular_file(filename)) {
  91                         ret = -1;
  92                         break;
  93                 }
  94 
  95                 ret = filename__read_debuglink(filename, symfile, PATH_MAX);
  96                 if (ret)
  97                         break;
  98 
  99                 /* Check predefined locations where debug file might reside */
 100                 ret = -1;
 101                 for (i = 0; i < ARRAY_SIZE(debuglink_paths); i++) {
 102                         snprintf(filename, size,
 103                                         debuglink_paths[i], dso_dir, symfile);
 104                         if (is_regular_file(filename)) {
 105                                 ret = 0;
 106                                 break;
 107                         }
 108                 }
 109 
 110                 break;
 111         }
 112         case DSO_BINARY_TYPE__BUILD_ID_CACHE:
 113                 if (dso__build_id_filename(dso, filename, size, false) == NULL)
 114                         ret = -1;
 115                 break;
 116 
 117         case DSO_BINARY_TYPE__BUILD_ID_CACHE_DEBUGINFO:
 118                 if (dso__build_id_filename(dso, filename, size, true) == NULL)
 119                         ret = -1;
 120                 break;
 121 
 122         case DSO_BINARY_TYPE__FEDORA_DEBUGINFO:
 123                 len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
 124                 snprintf(filename + len, size - len, "%s.debug", dso->long_name);
 125                 break;
 126 
 127         case DSO_BINARY_TYPE__UBUNTU_DEBUGINFO:
 128                 len = __symbol__join_symfs(filename, size, "/usr/lib/debug");
 129                 snprintf(filename + len, size - len, "%s", dso->long_name);
 130                 break;
 131 
 132         case DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO:
 133         {
 134                 const char *last_slash;
 135                 size_t dir_size;
 136 
 137                 last_slash = dso->long_name + dso->long_name_len;
 138                 while (last_slash != dso->long_name && *last_slash != '/')
 139                         last_slash--;
 140 
 141                 len = __symbol__join_symfs(filename, size, "");
 142                 dir_size = last_slash - dso->long_name + 2;
 143                 if (dir_size > (size - len)) {
 144                         ret = -1;
 145                         break;
 146                 }
 147                 len += scnprintf(filename + len, dir_size, "%s",  dso->long_name);
 148                 len += scnprintf(filename + len , size - len, ".debug%s",
 149                                                                 last_slash);
 150                 break;
 151         }
 152 
 153         case DSO_BINARY_TYPE__BUILDID_DEBUGINFO:
 154                 if (!dso->has_build_id) {
 155                         ret = -1;
 156                         break;
 157                 }
 158 
 159                 build_id__sprintf(dso->build_id,
 160                                   sizeof(dso->build_id),
 161                                   build_id_hex);
 162                 len = __symbol__join_symfs(filename, size, "/usr/lib/debug/.build-id/");
 163                 snprintf(filename + len, size - len, "%.2s/%s.debug",
 164                          build_id_hex, build_id_hex + 2);
 165                 break;
 166 
 167         case DSO_BINARY_TYPE__VMLINUX:
 168         case DSO_BINARY_TYPE__GUEST_VMLINUX:
 169         case DSO_BINARY_TYPE__SYSTEM_PATH_DSO:
 170                 __symbol__join_symfs(filename, size, dso->long_name);
 171                 break;
 172 
 173         case DSO_BINARY_TYPE__GUEST_KMODULE:
 174         case DSO_BINARY_TYPE__GUEST_KMODULE_COMP:
 175                 path__join3(filename, size, symbol_conf.symfs,
 176                             root_dir, dso->long_name);
 177                 break;
 178 
 179         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE:
 180         case DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP:
 181                 __symbol__join_symfs(filename, size, dso->long_name);
 182                 break;
 183 
 184         case DSO_BINARY_TYPE__KCORE:
 185         case DSO_BINARY_TYPE__GUEST_KCORE:
 186                 snprintf(filename, size, "%s", dso->long_name);
 187                 break;
 188 
 189         default:
 190         case DSO_BINARY_TYPE__KALLSYMS:
 191         case DSO_BINARY_TYPE__GUEST_KALLSYMS:
 192         case DSO_BINARY_TYPE__JAVA_JIT:
 193         case DSO_BINARY_TYPE__BPF_PROG_INFO:
 194         case DSO_BINARY_TYPE__NOT_FOUND:
 195                 ret = -1;
 196                 break;
 197         }
 198 
 199         return ret;
 200 }
 201 
 202 enum {
 203         COMP_ID__NONE = 0,
 204 };
 205 
 206 static const struct {
 207         const char *fmt;
 208         int (*decompress)(const char *input, int output);
 209         bool (*is_compressed)(const char *input);
 210 } compressions[] = {
 211         [COMP_ID__NONE] = { .fmt = NULL, },
 212 #ifdef HAVE_ZLIB_SUPPORT
 213         { "gz", gzip_decompress_to_file, gzip_is_compressed },
 214 #endif
 215 #ifdef HAVE_LZMA_SUPPORT
 216         { "xz", lzma_decompress_to_file, lzma_is_compressed },
 217 #endif
 218         { NULL, NULL, NULL },
 219 };
 220 
 221 static int is_supported_compression(const char *ext)
 222 {
 223         unsigned i;
 224 
 225         for (i = 1; compressions[i].fmt; i++) {
 226                 if (!strcmp(ext, compressions[i].fmt))
 227                         return i;
 228         }
 229         return COMP_ID__NONE;
 230 }
 231 
 232 bool is_kernel_module(const char *pathname, int cpumode)
 233 {
 234         struct kmod_path m;
 235         int mode = cpumode & PERF_RECORD_MISC_CPUMODE_MASK;
 236 
 237         WARN_ONCE(mode != cpumode,
 238                   "Internal error: passing unmasked cpumode (%x) to is_kernel_module",
 239                   cpumode);
 240 
 241         switch (mode) {
 242         case PERF_RECORD_MISC_USER:
 243         case PERF_RECORD_MISC_HYPERVISOR:
 244         case PERF_RECORD_MISC_GUEST_USER:
 245                 return false;
 246         /* Treat PERF_RECORD_MISC_CPUMODE_UNKNOWN as kernel */
 247         default:
 248                 if (kmod_path__parse(&m, pathname)) {
 249                         pr_err("Failed to check whether %s is a kernel module or not. Assume it is.",
 250                                         pathname);
 251                         return true;
 252                 }
 253         }
 254 
 255         return m.kmod;
 256 }
 257 
 258 bool dso__needs_decompress(struct dso *dso)
 259 {
 260         return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
 261                 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
 262 }
 263 
 264 static int decompress_kmodule(struct dso *dso, const char *name,
 265                               char *pathname, size_t len)
 266 {
 267         char tmpbuf[] = KMOD_DECOMP_NAME;
 268         int fd = -1;
 269 
 270         if (!dso__needs_decompress(dso))
 271                 return -1;
 272 
 273         if (dso->comp == COMP_ID__NONE)
 274                 return -1;
 275 
 276         /*
 277          * We have proper compression id for DSO and yet the file
 278          * behind the 'name' can still be plain uncompressed object.
 279          *
 280          * The reason is behind the logic we open the DSO object files,
 281          * when we try all possible 'debug' objects until we find the
 282          * data. So even if the DSO is represented by 'krava.xz' module,
 283          * we can end up here opening ~/.debug/....23432432/debug' file
 284          * which is not compressed.
 285          *
 286          * To keep this transparent, we detect this and return the file
 287          * descriptor to the uncompressed file.
 288          */
 289         if (!compressions[dso->comp].is_compressed(name))
 290                 return open(name, O_RDONLY);
 291 
 292         fd = mkstemp(tmpbuf);
 293         if (fd < 0) {
 294                 dso->load_errno = errno;
 295                 return -1;
 296         }
 297 
 298         if (compressions[dso->comp].decompress(name, fd)) {
 299                 dso->load_errno = DSO_LOAD_ERRNO__DECOMPRESSION_FAILURE;
 300                 close(fd);
 301                 fd = -1;
 302         }
 303 
 304         if (!pathname || (fd < 0))
 305                 unlink(tmpbuf);
 306 
 307         if (pathname && (fd >= 0))
 308                 strlcpy(pathname, tmpbuf, len);
 309 
 310         return fd;
 311 }
 312 
 313 int dso__decompress_kmodule_fd(struct dso *dso, const char *name)
 314 {
 315         return decompress_kmodule(dso, name, NULL, 0);
 316 }
 317 
 318 int dso__decompress_kmodule_path(struct dso *dso, const char *name,
 319                                  char *pathname, size_t len)
 320 {
 321         int fd = decompress_kmodule(dso, name, pathname, len);
 322 
 323         close(fd);
 324         return fd >= 0 ? 0 : -1;
 325 }
 326 
 327 /*
 328  * Parses kernel module specified in @path and updates
 329  * @m argument like:
 330  *
 331  *    @comp - true if @path contains supported compression suffix,
 332  *            false otherwise
 333  *    @kmod - true if @path contains '.ko' suffix in right position,
 334  *            false otherwise
 335  *    @name - if (@alloc_name && @kmod) is true, it contains strdup-ed base name
 336  *            of the kernel module without suffixes, otherwise strudup-ed
 337  *            base name of @path
 338  *    @ext  - if (@alloc_ext && @comp) is true, it contains strdup-ed string
 339  *            the compression suffix
 340  *
 341  * Returns 0 if there's no strdup error, -ENOMEM otherwise.
 342  */
 343 int __kmod_path__parse(struct kmod_path *m, const char *path,
 344                        bool alloc_name)
 345 {
 346         const char *name = strrchr(path, '/');
 347         const char *ext  = strrchr(path, '.');
 348         bool is_simple_name = false;
 349 
 350         memset(m, 0x0, sizeof(*m));
 351         name = name ? name + 1 : path;
 352 
 353         /*
 354          * '.' is also a valid character for module name. For example:
 355          * [aaa.bbb] is a valid module name. '[' should have higher
 356          * priority than '.ko' suffix.
 357          *
 358          * The kernel names are from machine__mmap_name. Such
 359          * name should belong to kernel itself, not kernel module.
 360          */
 361         if (name[0] == '[') {
 362                 is_simple_name = true;
 363                 if ((strncmp(name, "[kernel.kallsyms]", 17) == 0) ||
 364                     (strncmp(name, "[guest.kernel.kallsyms", 22) == 0) ||
 365                     (strncmp(name, "[vdso]", 6) == 0) ||
 366                     (strncmp(name, "[vdso32]", 8) == 0) ||
 367                     (strncmp(name, "[vdsox32]", 9) == 0) ||
 368                     (strncmp(name, "[vsyscall]", 10) == 0)) {
 369                         m->kmod = false;
 370 
 371                 } else
 372                         m->kmod = true;
 373         }
 374 
 375         /* No extension, just return name. */
 376         if ((ext == NULL) || is_simple_name) {
 377                 if (alloc_name) {
 378                         m->name = strdup(name);
 379                         return m->name ? 0 : -ENOMEM;
 380                 }
 381                 return 0;
 382         }
 383 
 384         m->comp = is_supported_compression(ext + 1);
 385         if (m->comp > COMP_ID__NONE)
 386                 ext -= 3;
 387 
 388         /* Check .ko extension only if there's enough name left. */
 389         if (ext > name)
 390                 m->kmod = !strncmp(ext, ".ko", 3);
 391 
 392         if (alloc_name) {
 393                 if (m->kmod) {
 394                         if (asprintf(&m->name, "[%.*s]", (int) (ext - name), name) == -1)
 395                                 return -ENOMEM;
 396                 } else {
 397                         if (asprintf(&m->name, "%s", name) == -1)
 398                                 return -ENOMEM;
 399                 }
 400 
 401                 strreplace(m->name, '-', '_');
 402         }
 403 
 404         return 0;
 405 }
 406 
 407 void dso__set_module_info(struct dso *dso, struct kmod_path *m,
 408                           struct machine *machine)
 409 {
 410         if (machine__is_host(machine))
 411                 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
 412         else
 413                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
 414 
 415         /* _KMODULE_COMP should be next to _KMODULE */
 416         if (m->kmod && m->comp) {
 417                 dso->symtab_type++;
 418                 dso->comp = m->comp;
 419         }
 420 
 421         dso__set_short_name(dso, strdup(m->name), true);
 422 }
 423 
 424 /*
 425  * Global list of open DSOs and the counter.
 426  */
 427 static LIST_HEAD(dso__data_open);
 428 static long dso__data_open_cnt;
 429 static pthread_mutex_t dso__data_open_lock = PTHREAD_MUTEX_INITIALIZER;
 430 
 431 static void dso__list_add(struct dso *dso)
 432 {
 433         list_add_tail(&dso->data.open_entry, &dso__data_open);
 434         dso__data_open_cnt++;
 435 }
 436 
 437 static void dso__list_del(struct dso *dso)
 438 {
 439         list_del_init(&dso->data.open_entry);
 440         WARN_ONCE(dso__data_open_cnt <= 0,
 441                   "DSO data fd counter out of bounds.");
 442         dso__data_open_cnt--;
 443 }
 444 
 445 static void close_first_dso(void);
 446 
 447 static int do_open(char *name)
 448 {
 449         int fd;
 450         char sbuf[STRERR_BUFSIZE];
 451 
 452         do {
 453                 fd = open(name, O_RDONLY|O_CLOEXEC);
 454                 if (fd >= 0)
 455                         return fd;
 456 
 457                 pr_debug("dso open failed: %s\n",
 458                          str_error_r(errno, sbuf, sizeof(sbuf)));
 459                 if (!dso__data_open_cnt || errno != EMFILE)
 460                         break;
 461 
 462                 close_first_dso();
 463         } while (1);
 464 
 465         return -1;
 466 }
 467 
 468 static int __open_dso(struct dso *dso, struct machine *machine)
 469 {
 470         int fd = -EINVAL;
 471         char *root_dir = (char *)"";
 472         char *name = malloc(PATH_MAX);
 473         bool decomp = false;
 474 
 475         if (!name)
 476                 return -ENOMEM;
 477 
 478         if (machine)
 479                 root_dir = machine->root_dir;
 480 
 481         if (dso__read_binary_type_filename(dso, dso->binary_type,
 482                                             root_dir, name, PATH_MAX))
 483                 goto out;
 484 
 485         if (!is_regular_file(name))
 486                 goto out;
 487 
 488         if (dso__needs_decompress(dso)) {
 489                 char newpath[KMOD_DECOMP_LEN];
 490                 size_t len = sizeof(newpath);
 491 
 492                 if (dso__decompress_kmodule_path(dso, name, newpath, len) < 0) {
 493                         fd = -dso->load_errno;
 494                         goto out;
 495                 }
 496 
 497                 decomp = true;
 498                 strcpy(name, newpath);
 499         }
 500 
 501         fd = do_open(name);
 502 
 503         if (decomp)
 504                 unlink(name);
 505 
 506 out:
 507         free(name);
 508         return fd;
 509 }
 510 
 511 static void check_data_close(void);
 512 
 513 /**
 514  * dso_close - Open DSO data file
 515  * @dso: dso object
 516  *
 517  * Open @dso's data file descriptor and updates
 518  * list/count of open DSO objects.
 519  */
 520 static int open_dso(struct dso *dso, struct machine *machine)
 521 {
 522         int fd;
 523         struct nscookie nsc;
 524 
 525         if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
 526                 nsinfo__mountns_enter(dso->nsinfo, &nsc);
 527         fd = __open_dso(dso, machine);
 528         if (dso->binary_type != DSO_BINARY_TYPE__BUILD_ID_CACHE)
 529                 nsinfo__mountns_exit(&nsc);
 530 
 531         if (fd >= 0) {
 532                 dso__list_add(dso);
 533                 /*
 534                  * Check if we crossed the allowed number
 535                  * of opened DSOs and close one if needed.
 536                  */
 537                 check_data_close();
 538         }
 539 
 540         return fd;
 541 }
 542 
 543 static void close_data_fd(struct dso *dso)
 544 {
 545         if (dso->data.fd >= 0) {
 546                 close(dso->data.fd);
 547                 dso->data.fd = -1;
 548                 dso->data.file_size = 0;
 549                 dso__list_del(dso);
 550         }
 551 }
 552 
 553 /**
 554  * dso_close - Close DSO data file
 555  * @dso: dso object
 556  *
 557  * Close @dso's data file descriptor and updates
 558  * list/count of open DSO objects.
 559  */
 560 static void close_dso(struct dso *dso)
 561 {
 562         close_data_fd(dso);
 563 }
 564 
 565 static void close_first_dso(void)
 566 {
 567         struct dso *dso;
 568 
 569         dso = list_first_entry(&dso__data_open, struct dso, data.open_entry);
 570         close_dso(dso);
 571 }
 572 
 573 static rlim_t get_fd_limit(void)
 574 {
 575         struct rlimit l;
 576         rlim_t limit = 0;
 577 
 578         /* Allow half of the current open fd limit. */
 579         if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
 580                 if (l.rlim_cur == RLIM_INFINITY)
 581                         limit = l.rlim_cur;
 582                 else
 583                         limit = l.rlim_cur / 2;
 584         } else {
 585                 pr_err("failed to get fd limit\n");
 586                 limit = 1;
 587         }
 588 
 589         return limit;
 590 }
 591 
 592 static rlim_t fd_limit;
 593 
 594 /*
 595  * Used only by tests/dso-data.c to reset the environment
 596  * for tests. I dont expect we should change this during
 597  * standard runtime.
 598  */
 599 void reset_fd_limit(void)
 600 {
 601         fd_limit = 0;
 602 }
 603 
 604 static bool may_cache_fd(void)
 605 {
 606         if (!fd_limit)
 607                 fd_limit = get_fd_limit();
 608 
 609         if (fd_limit == RLIM_INFINITY)
 610                 return true;
 611 
 612         return fd_limit > (rlim_t) dso__data_open_cnt;
 613 }
 614 
 615 /*
 616  * Check and close LRU dso if we crossed allowed limit
 617  * for opened dso file descriptors. The limit is half
 618  * of the RLIMIT_NOFILE files opened.
 619 */
 620 static void check_data_close(void)
 621 {
 622         bool cache_fd = may_cache_fd();
 623 
 624         if (!cache_fd)
 625                 close_first_dso();
 626 }
 627 
 628 /**
 629  * dso__data_close - Close DSO data file
 630  * @dso: dso object
 631  *
 632  * External interface to close @dso's data file descriptor.
 633  */
 634 void dso__data_close(struct dso *dso)
 635 {
 636         pthread_mutex_lock(&dso__data_open_lock);
 637         close_dso(dso);
 638         pthread_mutex_unlock(&dso__data_open_lock);
 639 }
 640 
 641 static void try_to_open_dso(struct dso *dso, struct machine *machine)
 642 {
 643         enum dso_binary_type binary_type_data[] = {
 644                 DSO_BINARY_TYPE__BUILD_ID_CACHE,
 645                 DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
 646                 DSO_BINARY_TYPE__NOT_FOUND,
 647         };
 648         int i = 0;
 649 
 650         if (dso->data.fd >= 0)
 651                 return;
 652 
 653         if (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND) {
 654                 dso->data.fd = open_dso(dso, machine);
 655                 goto out;
 656         }
 657 
 658         do {
 659                 dso->binary_type = binary_type_data[i++];
 660 
 661                 dso->data.fd = open_dso(dso, machine);
 662                 if (dso->data.fd >= 0)
 663                         goto out;
 664 
 665         } while (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND);
 666 out:
 667         if (dso->data.fd >= 0)
 668                 dso->data.status = DSO_DATA_STATUS_OK;
 669         else
 670                 dso->data.status = DSO_DATA_STATUS_ERROR;
 671 }
 672 
 673 /**
 674  * dso__data_get_fd - Get dso's data file descriptor
 675  * @dso: dso object
 676  * @machine: machine object
 677  *
 678  * External interface to find dso's file, open it and
 679  * returns file descriptor.  It should be paired with
 680  * dso__data_put_fd() if it returns non-negative value.
 681  */
 682 int dso__data_get_fd(struct dso *dso, struct machine *machine)
 683 {
 684         if (dso->data.status == DSO_DATA_STATUS_ERROR)
 685                 return -1;
 686 
 687         if (pthread_mutex_lock(&dso__data_open_lock) < 0)
 688                 return -1;
 689 
 690         try_to_open_dso(dso, machine);
 691 
 692         if (dso->data.fd < 0)
 693                 pthread_mutex_unlock(&dso__data_open_lock);
 694 
 695         return dso->data.fd;
 696 }
 697 
 698 void dso__data_put_fd(struct dso *dso __maybe_unused)
 699 {
 700         pthread_mutex_unlock(&dso__data_open_lock);
 701 }
 702 
 703 bool dso__data_status_seen(struct dso *dso, enum dso_data_status_seen by)
 704 {
 705         u32 flag = 1 << by;
 706 
 707         if (dso->data.status_seen & flag)
 708                 return true;
 709 
 710         dso->data.status_seen |= flag;
 711 
 712         return false;
 713 }
 714 
 715 static ssize_t bpf_read(struct dso *dso, u64 offset, char *data)
 716 {
 717         struct bpf_prog_info_node *node;
 718         ssize_t size = DSO__DATA_CACHE_SIZE;
 719         u64 len;
 720         u8 *buf;
 721 
 722         node = perf_env__find_bpf_prog_info(dso->bpf_prog.env, dso->bpf_prog.id);
 723         if (!node || !node->info_linear) {
 724                 dso->data.status = DSO_DATA_STATUS_ERROR;
 725                 return -1;
 726         }
 727 
 728         len = node->info_linear->info.jited_prog_len;
 729         buf = (u8 *)(uintptr_t)node->info_linear->info.jited_prog_insns;
 730 
 731         if (offset >= len)
 732                 return -1;
 733 
 734         size = (ssize_t)min(len - offset, (u64)size);
 735         memcpy(data, buf + offset, size);
 736         return size;
 737 }
 738 
 739 static int bpf_size(struct dso *dso)
 740 {
 741         struct bpf_prog_info_node *node;
 742 
 743         node = perf_env__find_bpf_prog_info(dso->bpf_prog.env, dso->bpf_prog.id);
 744         if (!node || !node->info_linear) {
 745                 dso->data.status = DSO_DATA_STATUS_ERROR;
 746                 return -1;
 747         }
 748 
 749         dso->data.file_size = node->info_linear->info.jited_prog_len;
 750         return 0;
 751 }
 752 
 753 static void
 754 dso_cache__free(struct dso *dso)
 755 {
 756         struct rb_root *root = &dso->data.cache;
 757         struct rb_node *next = rb_first(root);
 758 
 759         pthread_mutex_lock(&dso->lock);
 760         while (next) {
 761                 struct dso_cache *cache;
 762 
 763                 cache = rb_entry(next, struct dso_cache, rb_node);
 764                 next = rb_next(&cache->rb_node);
 765                 rb_erase(&cache->rb_node, root);
 766                 free(cache);
 767         }
 768         pthread_mutex_unlock(&dso->lock);
 769 }
 770 
 771 static struct dso_cache *dso_cache__find(struct dso *dso, u64 offset)
 772 {
 773         const struct rb_root *root = &dso->data.cache;
 774         struct rb_node * const *p = &root->rb_node;
 775         const struct rb_node *parent = NULL;
 776         struct dso_cache *cache;
 777 
 778         while (*p != NULL) {
 779                 u64 end;
 780 
 781                 parent = *p;
 782                 cache = rb_entry(parent, struct dso_cache, rb_node);
 783                 end = cache->offset + DSO__DATA_CACHE_SIZE;
 784 
 785                 if (offset < cache->offset)
 786                         p = &(*p)->rb_left;
 787                 else if (offset >= end)
 788                         p = &(*p)->rb_right;
 789                 else
 790                         return cache;
 791         }
 792 
 793         return NULL;
 794 }
 795 
 796 static struct dso_cache *
 797 dso_cache__insert(struct dso *dso, struct dso_cache *new)
 798 {
 799         struct rb_root *root = &dso->data.cache;
 800         struct rb_node **p = &root->rb_node;
 801         struct rb_node *parent = NULL;
 802         struct dso_cache *cache;
 803         u64 offset = new->offset;
 804 
 805         pthread_mutex_lock(&dso->lock);
 806         while (*p != NULL) {
 807                 u64 end;
 808 
 809                 parent = *p;
 810                 cache = rb_entry(parent, struct dso_cache, rb_node);
 811                 end = cache->offset + DSO__DATA_CACHE_SIZE;
 812 
 813                 if (offset < cache->offset)
 814                         p = &(*p)->rb_left;
 815                 else if (offset >= end)
 816                         p = &(*p)->rb_right;
 817                 else
 818                         goto out;
 819         }
 820 
 821         rb_link_node(&new->rb_node, parent, p);
 822         rb_insert_color(&new->rb_node, root);
 823 
 824         cache = NULL;
 825 out:
 826         pthread_mutex_unlock(&dso->lock);
 827         return cache;
 828 }
 829 
 830 static ssize_t
 831 dso_cache__memcpy(struct dso_cache *cache, u64 offset,
 832                   u8 *data, u64 size)
 833 {
 834         u64 cache_offset = offset - cache->offset;
 835         u64 cache_size   = min(cache->size - cache_offset, size);
 836 
 837         memcpy(data, cache->data + cache_offset, cache_size);
 838         return cache_size;
 839 }
 840 
 841 static ssize_t file_read(struct dso *dso, struct machine *machine,
 842                          u64 offset, char *data)
 843 {
 844         ssize_t ret;
 845 
 846         pthread_mutex_lock(&dso__data_open_lock);
 847 
 848         /*
 849          * dso->data.fd might be closed if other thread opened another
 850          * file (dso) due to open file limit (RLIMIT_NOFILE).
 851          */
 852         try_to_open_dso(dso, machine);
 853 
 854         if (dso->data.fd < 0) {
 855                 dso->data.status = DSO_DATA_STATUS_ERROR;
 856                 ret = -errno;
 857                 goto out;
 858         }
 859 
 860         ret = pread(dso->data.fd, data, DSO__DATA_CACHE_SIZE, offset);
 861 out:
 862         pthread_mutex_unlock(&dso__data_open_lock);
 863         return ret;
 864 }
 865 
 866 static ssize_t
 867 dso_cache__read(struct dso *dso, struct machine *machine,
 868                 u64 offset, u8 *data, ssize_t size)
 869 {
 870         u64 cache_offset = offset & DSO__DATA_CACHE_MASK;
 871         struct dso_cache *cache;
 872         struct dso_cache *old;
 873         ssize_t ret;
 874 
 875         cache = zalloc(sizeof(*cache) + DSO__DATA_CACHE_SIZE);
 876         if (!cache)
 877                 return -ENOMEM;
 878 
 879         if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
 880                 ret = bpf_read(dso, cache_offset, cache->data);
 881         else
 882                 ret = file_read(dso, machine, cache_offset, cache->data);
 883 
 884         if (ret > 0) {
 885                 cache->offset = cache_offset;
 886                 cache->size   = ret;
 887 
 888                 old = dso_cache__insert(dso, cache);
 889                 if (old) {
 890                         /* we lose the race */
 891                         free(cache);
 892                         cache = old;
 893                 }
 894 
 895                 ret = dso_cache__memcpy(cache, offset, data, size);
 896         }
 897 
 898         if (ret <= 0)
 899                 free(cache);
 900 
 901         return ret;
 902 }
 903 
 904 static ssize_t dso_cache_read(struct dso *dso, struct machine *machine,
 905                               u64 offset, u8 *data, ssize_t size)
 906 {
 907         struct dso_cache *cache;
 908 
 909         cache = dso_cache__find(dso, offset);
 910         if (cache)
 911                 return dso_cache__memcpy(cache, offset, data, size);
 912         else
 913                 return dso_cache__read(dso, machine, offset, data, size);
 914 }
 915 
 916 /*
 917  * Reads and caches dso data DSO__DATA_CACHE_SIZE size chunks
 918  * in the rb_tree. Any read to already cached data is served
 919  * by cached data.
 920  */
 921 static ssize_t cached_read(struct dso *dso, struct machine *machine,
 922                            u64 offset, u8 *data, ssize_t size)
 923 {
 924         ssize_t r = 0;
 925         u8 *p = data;
 926 
 927         do {
 928                 ssize_t ret;
 929 
 930                 ret = dso_cache_read(dso, machine, offset, p, size);
 931                 if (ret < 0)
 932                         return ret;
 933 
 934                 /* Reached EOF, return what we have. */
 935                 if (!ret)
 936                         break;
 937 
 938                 BUG_ON(ret > size);
 939 
 940                 r      += ret;
 941                 p      += ret;
 942                 offset += ret;
 943                 size   -= ret;
 944 
 945         } while (size);
 946 
 947         return r;
 948 }
 949 
 950 static int file_size(struct dso *dso, struct machine *machine)
 951 {
 952         int ret = 0;
 953         struct stat st;
 954         char sbuf[STRERR_BUFSIZE];
 955 
 956         pthread_mutex_lock(&dso__data_open_lock);
 957 
 958         /*
 959          * dso->data.fd might be closed if other thread opened another
 960          * file (dso) due to open file limit (RLIMIT_NOFILE).
 961          */
 962         try_to_open_dso(dso, machine);
 963 
 964         if (dso->data.fd < 0) {
 965                 ret = -errno;
 966                 dso->data.status = DSO_DATA_STATUS_ERROR;
 967                 goto out;
 968         }
 969 
 970         if (fstat(dso->data.fd, &st) < 0) {
 971                 ret = -errno;
 972                 pr_err("dso cache fstat failed: %s\n",
 973                        str_error_r(errno, sbuf, sizeof(sbuf)));
 974                 dso->data.status = DSO_DATA_STATUS_ERROR;
 975                 goto out;
 976         }
 977         dso->data.file_size = st.st_size;
 978 
 979 out:
 980         pthread_mutex_unlock(&dso__data_open_lock);
 981         return ret;
 982 }
 983 
 984 int dso__data_file_size(struct dso *dso, struct machine *machine)
 985 {
 986         if (dso->data.file_size)
 987                 return 0;
 988 
 989         if (dso->data.status == DSO_DATA_STATUS_ERROR)
 990                 return -1;
 991 
 992         if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
 993                 return bpf_size(dso);
 994 
 995         return file_size(dso, machine);
 996 }
 997 
 998 /**
 999  * dso__data_size - Return dso data size
1000  * @dso: dso object
1001  * @machine: machine object
1002  *
1003  * Return: dso data size
1004  */
1005 off_t dso__data_size(struct dso *dso, struct machine *machine)
1006 {
1007         if (dso__data_file_size(dso, machine))
1008                 return -1;
1009 
1010         /* For now just estimate dso data size is close to file size */
1011         return dso->data.file_size;
1012 }
1013 
1014 static ssize_t data_read_offset(struct dso *dso, struct machine *machine,
1015                                 u64 offset, u8 *data, ssize_t size)
1016 {
1017         if (dso__data_file_size(dso, machine))
1018                 return -1;
1019 
1020         /* Check the offset sanity. */
1021         if (offset > dso->data.file_size)
1022                 return -1;
1023 
1024         if (offset + size < offset)
1025                 return -1;
1026 
1027         return cached_read(dso, machine, offset, data, size);
1028 }
1029 
1030 /**
1031  * dso__data_read_offset - Read data from dso file offset
1032  * @dso: dso object
1033  * @machine: machine object
1034  * @offset: file offset
1035  * @data: buffer to store data
1036  * @size: size of the @data buffer
1037  *
1038  * External interface to read data from dso file offset. Open
1039  * dso data file and use cached_read to get the data.
1040  */
1041 ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
1042                               u64 offset, u8 *data, ssize_t size)
1043 {
1044         if (dso->data.status == DSO_DATA_STATUS_ERROR)
1045                 return -1;
1046 
1047         return data_read_offset(dso, machine, offset, data, size);
1048 }
1049 
1050 /**
1051  * dso__data_read_addr - Read data from dso address
1052  * @dso: dso object
1053  * @machine: machine object
1054  * @add: virtual memory address
1055  * @data: buffer to store data
1056  * @size: size of the @data buffer
1057  *
1058  * External interface to read data from dso address.
1059  */
1060 ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
1061                             struct machine *machine, u64 addr,
1062                             u8 *data, ssize_t size)
1063 {
1064         u64 offset = map->map_ip(map, addr);
1065         return dso__data_read_offset(dso, machine, offset, data, size);
1066 }
1067 
1068 struct map *dso__new_map(const char *name)
1069 {
1070         struct map *map = NULL;
1071         struct dso *dso = dso__new(name);
1072 
1073         if (dso)
1074                 map = map__new2(0, dso);
1075 
1076         return map;
1077 }
1078 
1079 struct dso *machine__findnew_kernel(struct machine *machine, const char *name,
1080                                     const char *short_name, int dso_type)
1081 {
1082         /*
1083          * The kernel dso could be created by build_id processing.
1084          */
1085         struct dso *dso = machine__findnew_dso(machine, name);
1086 
1087         /*
1088          * We need to run this in all cases, since during the build_id
1089          * processing we had no idea this was the kernel dso.
1090          */
1091         if (dso != NULL) {
1092                 dso__set_short_name(dso, short_name, false);
1093                 dso->kernel = dso_type;
1094         }
1095 
1096         return dso;
1097 }
1098 
1099 void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated)
1100 {
1101         struct rb_root *root = dso->root;
1102 
1103         if (name == NULL)
1104                 return;
1105 
1106         if (dso->long_name_allocated)
1107                 free((char *)dso->long_name);
1108 
1109         if (root) {
1110                 rb_erase(&dso->rb_node, root);
1111                 /*
1112                  * __dsos__findnew_link_by_longname() isn't guaranteed to add it
1113                  * back, so a clean removal is required here.
1114                  */
1115                 RB_CLEAR_NODE(&dso->rb_node);
1116                 dso->root = NULL;
1117         }
1118 
1119         dso->long_name           = name;
1120         dso->long_name_len       = strlen(name);
1121         dso->long_name_allocated = name_allocated;
1122 
1123         if (root)
1124                 __dsos__findnew_link_by_longname(root, dso, NULL);
1125 }
1126 
1127 void dso__set_short_name(struct dso *dso, const char *name, bool name_allocated)
1128 {
1129         if (name == NULL)
1130                 return;
1131 
1132         if (dso->short_name_allocated)
1133                 free((char *)dso->short_name);
1134 
1135         dso->short_name           = name;
1136         dso->short_name_len       = strlen(name);
1137         dso->short_name_allocated = name_allocated;
1138 }
1139 
1140 int dso__name_len(const struct dso *dso)
1141 {
1142         if (!dso)
1143                 return strlen("[unknown]");
1144         if (verbose > 0)
1145                 return dso->long_name_len;
1146 
1147         return dso->short_name_len;
1148 }
1149 
1150 bool dso__loaded(const struct dso *dso)
1151 {
1152         return dso->loaded;
1153 }
1154 
1155 bool dso__sorted_by_name(const struct dso *dso)
1156 {
1157         return dso->sorted_by_name;
1158 }
1159 
1160 void dso__set_sorted_by_name(struct dso *dso)
1161 {
1162         dso->sorted_by_name = true;
1163 }
1164 
1165 struct dso *dso__new(const char *name)
1166 {
1167         struct dso *dso = calloc(1, sizeof(*dso) + strlen(name) + 1);
1168 
1169         if (dso != NULL) {
1170                 strcpy(dso->name, name);
1171                 dso__set_long_name(dso, dso->name, false);
1172                 dso__set_short_name(dso, dso->name, false);
1173                 dso->symbols = dso->symbol_names = RB_ROOT_CACHED;
1174                 dso->data.cache = RB_ROOT;
1175                 dso->inlined_nodes = RB_ROOT_CACHED;
1176                 dso->srclines = RB_ROOT_CACHED;
1177                 dso->data.fd = -1;
1178                 dso->data.status = DSO_DATA_STATUS_UNKNOWN;
1179                 dso->symtab_type = DSO_BINARY_TYPE__NOT_FOUND;
1180                 dso->binary_type = DSO_BINARY_TYPE__NOT_FOUND;
1181                 dso->is_64_bit = (sizeof(void *) == 8);
1182                 dso->loaded = 0;
1183                 dso->rel = 0;
1184                 dso->sorted_by_name = 0;
1185                 dso->has_build_id = 0;
1186                 dso->has_srcline = 1;
1187                 dso->a2l_fails = 1;
1188                 dso->kernel = DSO_TYPE_USER;
1189                 dso->needs_swap = DSO_SWAP__UNSET;
1190                 dso->comp = COMP_ID__NONE;
1191                 RB_CLEAR_NODE(&dso->rb_node);
1192                 dso->root = NULL;
1193                 INIT_LIST_HEAD(&dso->node);
1194                 INIT_LIST_HEAD(&dso->data.open_entry);
1195                 pthread_mutex_init(&dso->lock, NULL);
1196                 refcount_set(&dso->refcnt, 1);
1197         }
1198 
1199         return dso;
1200 }
1201 
1202 void dso__delete(struct dso *dso)
1203 {
1204         if (!RB_EMPTY_NODE(&dso->rb_node))
1205                 pr_err("DSO %s is still in rbtree when being deleted!\n",
1206                        dso->long_name);
1207 
1208         /* free inlines first, as they reference symbols */
1209         inlines__tree_delete(&dso->inlined_nodes);
1210         srcline__tree_delete(&dso->srclines);
1211         symbols__delete(&dso->symbols);
1212 
1213         if (dso->short_name_allocated) {
1214                 zfree((char **)&dso->short_name);
1215                 dso->short_name_allocated = false;
1216         }
1217 
1218         if (dso->long_name_allocated) {
1219                 zfree((char **)&dso->long_name);
1220                 dso->long_name_allocated = false;
1221         }
1222 
1223         dso__data_close(dso);
1224         auxtrace_cache__free(dso->auxtrace_cache);
1225         dso_cache__free(dso);
1226         dso__free_a2l(dso);
1227         zfree(&dso->symsrc_filename);
1228         nsinfo__zput(dso->nsinfo);
1229         pthread_mutex_destroy(&dso->lock);
1230         free(dso);
1231 }
1232 
1233 struct dso *dso__get(struct dso *dso)
1234 {
1235         if (dso)
1236                 refcount_inc(&dso->refcnt);
1237         return dso;
1238 }
1239 
1240 void dso__put(struct dso *dso)
1241 {
1242         if (dso && refcount_dec_and_test(&dso->refcnt))
1243                 dso__delete(dso);
1244 }
1245 
1246 void dso__set_build_id(struct dso *dso, void *build_id)
1247 {
1248         memcpy(dso->build_id, build_id, sizeof(dso->build_id));
1249         dso->has_build_id = 1;
1250 }
1251 
1252 bool dso__build_id_equal(const struct dso *dso, u8 *build_id)
1253 {
1254         return memcmp(dso->build_id, build_id, sizeof(dso->build_id)) == 0;
1255 }
1256 
1257 void dso__read_running_kernel_build_id(struct dso *dso, struct machine *machine)
1258 {
1259         char path[PATH_MAX];
1260 
1261         if (machine__is_default_guest(machine))
1262                 return;
1263         sprintf(path, "%s/sys/kernel/notes", machine->root_dir);
1264         if (sysfs__read_build_id(path, dso->build_id,
1265                                  sizeof(dso->build_id)) == 0)
1266                 dso->has_build_id = true;
1267 }
1268 
1269 int dso__kernel_module_get_build_id(struct dso *dso,
1270                                     const char *root_dir)
1271 {
1272         char filename[PATH_MAX];
1273         /*
1274          * kernel module short names are of the form "[module]" and
1275          * we need just "module" here.
1276          */
1277         const char *name = dso->short_name + 1;
1278 
1279         snprintf(filename, sizeof(filename),
1280                  "%s/sys/module/%.*s/notes/.note.gnu.build-id",
1281                  root_dir, (int)strlen(name) - 1, name);
1282 
1283         if (sysfs__read_build_id(filename, dso->build_id,
1284                                  sizeof(dso->build_id)) == 0)
1285                 dso->has_build_id = true;
1286 
1287         return 0;
1288 }
1289 
1290 size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
1291 {
1292         char sbuild_id[SBUILD_ID_SIZE];
1293 
1294         build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
1295         return fprintf(fp, "%s", sbuild_id);
1296 }
1297 
1298 size_t dso__fprintf(struct dso *dso, FILE *fp)
1299 {
1300         struct rb_node *nd;
1301         size_t ret = fprintf(fp, "dso: %s (", dso->short_name);
1302 
1303         if (dso->short_name != dso->long_name)
1304                 ret += fprintf(fp, "%s, ", dso->long_name);
1305         ret += fprintf(fp, "%sloaded, ", dso__loaded(dso) ? "" : "NOT ");
1306         ret += dso__fprintf_buildid(dso, fp);
1307         ret += fprintf(fp, ")\n");
1308         for (nd = rb_first_cached(&dso->symbols); nd; nd = rb_next(nd)) {
1309                 struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
1310                 ret += symbol__fprintf(pos, fp);
1311         }
1312 
1313         return ret;
1314 }
1315 
1316 enum dso_type dso__type(struct dso *dso, struct machine *machine)
1317 {
1318         int fd;
1319         enum dso_type type = DSO__TYPE_UNKNOWN;
1320 
1321         fd = dso__data_get_fd(dso, machine);
1322         if (fd >= 0) {
1323                 type = dso__type_fd(fd);
1324                 dso__data_put_fd(dso);
1325         }
1326 
1327         return type;
1328 }
1329 
1330 int dso__strerror_load(struct dso *dso, char *buf, size_t buflen)
1331 {
1332         int idx, errnum = dso->load_errno;
1333         /*
1334          * This must have a same ordering as the enum dso_load_errno.
1335          */
1336         static const char *dso_load__error_str[] = {
1337         "Internal tools/perf/ library error",
1338         "Invalid ELF file",
1339         "Can not read build id",
1340         "Mismatching build id",
1341         "Decompression failure",
1342         };
1343 
1344         BUG_ON(buflen == 0);
1345 
1346         if (errnum >= 0) {
1347                 const char *err = str_error_r(errnum, buf, buflen);
1348 
1349                 if (err != buf)
1350                         scnprintf(buf, buflen, "%s", err);
1351 
1352                 return 0;
1353         }
1354 
1355         if (errnum <  __DSO_LOAD_ERRNO__START || errnum >= __DSO_LOAD_ERRNO__END)
1356                 return -1;
1357 
1358         idx = errnum - __DSO_LOAD_ERRNO__START;
1359         scnprintf(buf, buflen, "%s", dso_load__error_str[idx]);
1360         return 0;
1361 }
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root/tools/perf/util/dso.c

DEFINITIONS
