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dfmgr.c
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1 /*-------------------------------------------------------------------------
2  *
3  * dfmgr.c
4  * Dynamic function manager code.
5  *
6  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  *
10  * IDENTIFICATION
11  * src/backend/utils/fmgr/dfmgr.c
12  *
13  *-------------------------------------------------------------------------
14  */
15 #include "postgres.h"
16 
17 #include <sys/stat.h>
18 
19 #ifdef HAVE_DLOPEN
20 #include <dlfcn.h>
21 
22 /*
23  * On macOS, <dlfcn.h> insists on including <stdbool.h>. If we're not
24  * using stdbool, undef bool to undo the damage.
25  */
26 #ifndef PG_USE_STDBOOL
27 #ifdef bool
28 #undef bool
29 #endif
30 #endif
31 #endif /* HAVE_DLOPEN */
32 
33 #include "fmgr.h"
34 #include "lib/stringinfo.h"
35 #include "miscadmin.h"
36 #include "storage/shmem.h"
37 #include "utils/hsearch.h"
38 
39 
40 /* signatures for PostgreSQL-specific library init/fini functions */
41 typedef void (*PG_init_t) (void);
42 typedef void (*PG_fini_t) (void);
43 
44 /* hashtable entry for rendezvous variables */
45 typedef struct
46 {
47  char varName[NAMEDATALEN]; /* hash key (must be first) */
48  void *varValue;
50 
51 /*
52  * List of dynamically loaded files (kept in malloc'd memory).
53  */
54 
55 typedef struct df_files
56 {
57  struct df_files *next; /* List link */
58  dev_t device; /* Device file is on */
59 #ifndef WIN32 /* ensures we never again depend on this under
60  * win32 */
61  ino_t inode; /* Inode number of file */
62 #endif
63  void *handle; /* a handle for pg_dl* functions */
64  char filename[FLEXIBLE_ARRAY_MEMBER]; /* Full pathname of file */
66 
67 static DynamicFileList *file_list = NULL;
68 static DynamicFileList *file_tail = NULL;
69 
70 /* stat() call under Win32 returns an st_ino field, but it has no meaning */
71 #ifndef WIN32
72 #define SAME_INODE(A,B) ((A).st_ino == (B).inode && (A).st_dev == (B).device)
73 #else
74 #define SAME_INODE(A,B) false
75 #endif
76 
78 
79 static void *internal_load_library(const char *libname);
80 static void incompatible_module_error(const char *libname,
81  const Pg_magic_struct *module_magic_data) pg_attribute_noreturn();
82 static void internal_unload_library(const char *libname);
83 static bool file_exists(const char *name);
84 static char *expand_dynamic_library_name(const char *name);
85 static void check_restricted_library_name(const char *name);
86 static char *substitute_libpath_macro(const char *name);
87 static char *find_in_dynamic_libpath(const char *basename);
88 
89 /* Magic structure that module needs to match to be accepted */
91 
92 
93 /*
94  * Load the specified dynamic-link library file, and look for a function
95  * named funcname in it.
96  *
97  * If the function is not found, we raise an error if signalNotFound is true,
98  * else return (PGFunction) NULL. Note that errors in loading the library
99  * will provoke ereport() regardless of signalNotFound.
100  *
101  * If filehandle is not NULL, then *filehandle will be set to a handle
102  * identifying the library file. The filehandle can be used with
103  * lookup_external_function to lookup additional functions in the same file
104  * at less cost than repeating load_external_function.
105  */
107 load_external_function(const char *filename, const char *funcname,
108  bool signalNotFound, void **filehandle)
109 {
110  char *fullname;
111  void *lib_handle;
112  PGFunction retval;
113 
114  /* Expand the possibly-abbreviated filename to an exact path name */
115  fullname = expand_dynamic_library_name(filename);
116 
117  /* Load the shared library, unless we already did */
118  lib_handle = internal_load_library(fullname);
119 
120  /* Return handle if caller wants it */
121  if (filehandle)
122  *filehandle = lib_handle;
123 
124  /* Look up the function within the library. */
125  retval = (PGFunction) dlsym(lib_handle, funcname);
126 
127  if (retval == NULL && signalNotFound)
128  ereport(ERROR,
129  (errcode(ERRCODE_UNDEFINED_FUNCTION),
130  errmsg("could not find function \"%s\" in file \"%s\"",
131  funcname, fullname)));
132 
133  pfree(fullname);
134  return retval;
135 }
136 
137 /*
138  * This function loads a shlib file without looking up any particular
139  * function in it. If the same shlib has previously been loaded,
140  * unload and reload it.
141  *
142  * When 'restricted' is true, only libraries in the presumed-secure
143  * directory $libdir/plugins may be referenced.
144  */
145 void
146 load_file(const char *filename, bool restricted)
147 {
148  char *fullname;
149 
150  /* Apply security restriction if requested */
151  if (restricted)
153 
154  /* Expand the possibly-abbreviated filename to an exact path name */
155  fullname = expand_dynamic_library_name(filename);
156 
157  /* Unload the library if currently loaded */
158  internal_unload_library(fullname);
159 
160  /* Load the shared library */
161  (void) internal_load_library(fullname);
162 
163  pfree(fullname);
164 }
165 
166 /*
167  * Lookup a function whose library file is already loaded.
168  * Return (PGFunction) NULL if not found.
169  */
171 lookup_external_function(void *filehandle, const char *funcname)
172 {
173  return (PGFunction) dlsym(filehandle, funcname);
174 }
175 
176 
177 /*
178  * Load the specified dynamic-link library file, unless it already is
179  * loaded. Return the pg_dl* handle for the file.
180  *
181  * Note: libname is expected to be an exact name for the library file.
182  */
183 static void *
184 internal_load_library(const char *libname)
185 {
186  DynamicFileList *file_scanner;
187  PGModuleMagicFunction magic_func;
188  char *load_error;
189  struct stat stat_buf;
190  PG_init_t PG_init;
191 
192  /*
193  * Scan the list of loaded FILES to see if the file has been loaded.
194  */
195  for (file_scanner = file_list;
196  file_scanner != NULL &&
197  strcmp(libname, file_scanner->filename) != 0;
198  file_scanner = file_scanner->next)
199  ;
200 
201  if (file_scanner == NULL)
202  {
203  /*
204  * Check for same files - different paths (ie, symlink or link)
205  */
206  if (stat(libname, &stat_buf) == -1)
207  ereport(ERROR,
209  errmsg("could not access file \"%s\": %m",
210  libname)));
211 
212  for (file_scanner = file_list;
213  file_scanner != NULL &&
214  !SAME_INODE(stat_buf, *file_scanner);
215  file_scanner = file_scanner->next)
216  ;
217  }
218 
219  if (file_scanner == NULL)
220  {
221  /*
222  * File not loaded yet.
223  */
224  file_scanner = (DynamicFileList *)
225  malloc(offsetof(DynamicFileList, filename) + strlen(libname) + 1);
226  if (file_scanner == NULL)
227  ereport(ERROR,
228  (errcode(ERRCODE_OUT_OF_MEMORY),
229  errmsg("out of memory")));
230 
231  MemSet(file_scanner, 0, offsetof(DynamicFileList, filename));
232  strcpy(file_scanner->filename, libname);
233  file_scanner->device = stat_buf.st_dev;
234 #ifndef WIN32
235  file_scanner->inode = stat_buf.st_ino;
236 #endif
237  file_scanner->next = NULL;
238 
239  file_scanner->handle = dlopen(file_scanner->filename, RTLD_NOW | RTLD_GLOBAL);
240  if (file_scanner->handle == NULL)
241  {
242  load_error = dlerror();
243  free((char *) file_scanner);
244  /* errcode_for_file_access might not be appropriate here? */
245  ereport(ERROR,
247  errmsg("could not load library \"%s\": %s",
248  libname, load_error)));
249  }
250 
251  /* Check the magic function to determine compatibility */
252  magic_func = (PGModuleMagicFunction)
254  if (magic_func)
255  {
256  const Pg_magic_struct *magic_data_ptr = (*magic_func) ();
257 
258  if (magic_data_ptr->len != magic_data.len ||
259  memcmp(magic_data_ptr, &magic_data, magic_data.len) != 0)
260  {
261  /* copy data block before unlinking library */
262  Pg_magic_struct module_magic_data = *magic_data_ptr;
263 
264  /* try to close library */
265  dlclose(file_scanner->handle);
266  free((char *) file_scanner);
267 
268  /* issue suitable complaint */
269  incompatible_module_error(libname, &module_magic_data);
270  }
271  }
272  else
273  {
274  /* try to close library */
275  dlclose(file_scanner->handle);
276  free((char *) file_scanner);
277  /* complain */
278  ereport(ERROR,
279  (errmsg("incompatible library \"%s\": missing magic block",
280  libname),
281  errhint("Extension libraries are required to use the PG_MODULE_MAGIC macro.")));
282  }
283 
284  /*
285  * If the library has a _PG_init() function, call it.
286  */
287  PG_init = (PG_init_t) dlsym(file_scanner->handle, "_PG_init");
288  if (PG_init)
289  (*PG_init) ();
290 
291  /* OK to link it into list */
292  if (file_list == NULL)
293  file_list = file_scanner;
294  else
295  file_tail->next = file_scanner;
296  file_tail = file_scanner;
297  }
298 
299  return file_scanner->handle;
300 }
301 
302 /*
303  * Report a suitable error for an incompatible magic block.
304  */
305 static void
306 incompatible_module_error(const char *libname,
307  const Pg_magic_struct *module_magic_data)
308 {
309  StringInfoData details;
310 
311  /*
312  * If the version doesn't match, just report that, because the rest of the
313  * block might not even have the fields we expect.
314  */
315  if (magic_data.version != module_magic_data->version)
316  {
317  char library_version[32];
318 
319  if (module_magic_data->version >= 1000)
320  snprintf(library_version, sizeof(library_version), "%d",
321  module_magic_data->version / 100);
322  else
323  snprintf(library_version, sizeof(library_version), "%d.%d",
324  module_magic_data->version / 100,
325  module_magic_data->version % 100);
326  ereport(ERROR,
327  (errmsg("incompatible library \"%s\": version mismatch",
328  libname),
329  errdetail("Server is version %d, library is version %s.",
330  magic_data.version / 100, library_version)));
331  }
332 
333  /*
334  * Otherwise, spell out which fields don't agree.
335  *
336  * XXX this code has to be adjusted any time the set of fields in a magic
337  * block change!
338  */
339  initStringInfo(&details);
340 
341  if (module_magic_data->funcmaxargs != magic_data.funcmaxargs)
342  {
343  if (details.len)
344  appendStringInfoChar(&details, '\n');
345  appendStringInfo(&details,
346  _("Server has FUNC_MAX_ARGS = %d, library has %d."),
347  magic_data.funcmaxargs,
348  module_magic_data->funcmaxargs);
349  }
350  if (module_magic_data->indexmaxkeys != magic_data.indexmaxkeys)
351  {
352  if (details.len)
353  appendStringInfoChar(&details, '\n');
354  appendStringInfo(&details,
355  _("Server has INDEX_MAX_KEYS = %d, library has %d."),
356  magic_data.indexmaxkeys,
357  module_magic_data->indexmaxkeys);
358  }
359  if (module_magic_data->namedatalen != magic_data.namedatalen)
360  {
361  if (details.len)
362  appendStringInfoChar(&details, '\n');
363  appendStringInfo(&details,
364  _("Server has NAMEDATALEN = %d, library has %d."),
365  magic_data.namedatalen,
366  module_magic_data->namedatalen);
367  }
368  if (module_magic_data->float8byval != magic_data.float8byval)
369  {
370  if (details.len)
371  appendStringInfoChar(&details, '\n');
372  appendStringInfo(&details,
373  _("Server has FLOAT8PASSBYVAL = %s, library has %s."),
374  magic_data.float8byval ? "true" : "false",
375  module_magic_data->float8byval ? "true" : "false");
376  }
377 
378  if (details.len == 0)
379  appendStringInfoString(&details,
380  _("Magic block has unexpected length or padding difference."));
381 
382  ereport(ERROR,
383  (errmsg("incompatible library \"%s\": magic block mismatch",
384  libname),
385  errdetail_internal("%s", details.data)));
386 }
387 
388 /*
389  * Unload the specified dynamic-link library file, if it is loaded.
390  *
391  * Note: libname is expected to be an exact name for the library file.
392  *
393  * XXX for the moment, this is disabled, resulting in LOAD of an already-loaded
394  * library always being a no-op. We might re-enable it someday if we can
395  * convince ourselves we have safe protocols for un-hooking from hook function
396  * pointers, releasing custom GUC variables, and perhaps other things that
397  * are definitely unsafe currently.
398  */
399 static void
400 internal_unload_library(const char *libname)
401 {
402 #ifdef NOT_USED
403  DynamicFileList *file_scanner,
404  *prv,
405  *nxt;
406  struct stat stat_buf;
407  PG_fini_t PG_fini;
408 
409  /*
410  * We need to do stat() in order to determine whether this is the same
411  * file as a previously loaded file; it's also handy so as to give a good
412  * error message if bogus file name given.
413  */
414  if (stat(libname, &stat_buf) == -1)
415  ereport(ERROR,
417  errmsg("could not access file \"%s\": %m", libname)));
418 
419  /*
420  * We have to zap all entries in the list that match on either filename or
421  * inode, else internal_load_library() will still think it's present.
422  */
423  prv = NULL;
424  for (file_scanner = file_list; file_scanner != NULL; file_scanner = nxt)
425  {
426  nxt = file_scanner->next;
427  if (strcmp(libname, file_scanner->filename) == 0 ||
428  SAME_INODE(stat_buf, *file_scanner))
429  {
430  if (prv)
431  prv->next = nxt;
432  else
433  file_list = nxt;
434 
435  /*
436  * If the library has a _PG_fini() function, call it.
437  */
438  PG_fini = (PG_fini_t) dlsym(file_scanner->handle, "_PG_fini");
439  if (PG_fini)
440  (*PG_fini) ();
441 
442  clear_external_function_hash(file_scanner->handle);
443  dlclose(file_scanner->handle);
444  free((char *) file_scanner);
445  /* prv does not change */
446  }
447  else
448  prv = file_scanner;
449  }
450 #endif /* NOT_USED */
451 }
452 
453 static bool
454 file_exists(const char *name)
455 {
456  struct stat st;
457 
458  AssertArg(name != NULL);
459 
460  if (stat(name, &st) == 0)
461  return S_ISDIR(st.st_mode) ? false : true;
462  else if (!(errno == ENOENT || errno == ENOTDIR || errno == EACCES))
463  ereport(ERROR,
465  errmsg("could not access file \"%s\": %m", name)));
466 
467  return false;
468 }
469 
470 
471 /* Example format: ".so" */
472 #ifndef DLSUFFIX
473 #error "DLSUFFIX must be defined to compile this file."
474 #endif
475 
476 /*
477  * If name contains a slash, check if the file exists, if so return
478  * the name. Else (no slash) try to expand using search path (see
479  * find_in_dynamic_libpath below); if that works, return the fully
480  * expanded file name. If the previous failed, append DLSUFFIX and
481  * try again. If all fails, just return the original name.
482  *
483  * The result will always be freshly palloc'd.
484  */
485 static char *
487 {
488  bool have_slash;
489  char *new;
490  char *full;
491 
492  AssertArg(name);
493 
494  have_slash = (first_dir_separator(name) != NULL);
495 
496  if (!have_slash)
497  {
498  full = find_in_dynamic_libpath(name);
499  if (full)
500  return full;
501  }
502  else
503  {
504  full = substitute_libpath_macro(name);
505  if (file_exists(full))
506  return full;
507  pfree(full);
508  }
509 
510  new = psprintf("%s%s", name, DLSUFFIX);
511 
512  if (!have_slash)
513  {
514  full = find_in_dynamic_libpath(new);
515  pfree(new);
516  if (full)
517  return full;
518  }
519  else
520  {
521  full = substitute_libpath_macro(new);
522  pfree(new);
523  if (file_exists(full))
524  return full;
525  pfree(full);
526  }
527 
528  /*
529  * If we can't find the file, just return the string as-is. The ensuing
530  * load attempt will fail and report a suitable message.
531  */
532  return pstrdup(name);
533 }
534 
535 /*
536  * Check a restricted library name. It must begin with "$libdir/plugins/"
537  * and there must not be any directory separators after that (this is
538  * sufficient to prevent ".." style attacks).
539  */
540 static void
542 {
543  if (strncmp(name, "$libdir/plugins/", 16) != 0 ||
544  first_dir_separator(name + 16) != NULL)
545  ereport(ERROR,
546  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
547  errmsg("access to library \"%s\" is not allowed",
548  name)));
549 }
550 
551 /*
552  * Substitute for any macros appearing in the given string.
553  * Result is always freshly palloc'd.
554  */
555 static char *
557 {
558  const char *sep_ptr;
559 
560  AssertArg(name != NULL);
561 
562  /* Currently, we only recognize $libdir at the start of the string */
563  if (name[0] != '$')
564  return pstrdup(name);
565 
566  if ((sep_ptr = first_dir_separator(name)) == NULL)
567  sep_ptr = name + strlen(name);
568 
569  if (strlen("$libdir") != sep_ptr - name ||
570  strncmp(name, "$libdir", strlen("$libdir")) != 0)
571  ereport(ERROR,
572  (errcode(ERRCODE_INVALID_NAME),
573  errmsg("invalid macro name in dynamic library path: %s",
574  name)));
575 
576  return psprintf("%s%s", pkglib_path, sep_ptr);
577 }
578 
579 
580 /*
581  * Search for a file called 'basename' in the colon-separated search
582  * path Dynamic_library_path. If the file is found, the full file name
583  * is returned in freshly palloc'd memory. If the file is not found,
584  * return NULL.
585  */
586 static char *
587 find_in_dynamic_libpath(const char *basename)
588 {
589  const char *p;
590  size_t baselen;
591 
592  AssertArg(basename != NULL);
593  AssertArg(first_dir_separator(basename) == NULL);
595 
597  if (strlen(p) == 0)
598  return NULL;
599 
600  baselen = strlen(basename);
601 
602  for (;;)
603  {
604  size_t len;
605  char *piece;
606  char *mangled;
607  char *full;
608 
609  piece = first_path_var_separator(p);
610  if (piece == p)
611  ereport(ERROR,
612  (errcode(ERRCODE_INVALID_NAME),
613  errmsg("zero-length component in parameter \"dynamic_library_path\"")));
614 
615  if (piece == NULL)
616  len = strlen(p);
617  else
618  len = piece - p;
619 
620  piece = palloc(len + 1);
621  strlcpy(piece, p, len + 1);
622 
623  mangled = substitute_libpath_macro(piece);
624  pfree(piece);
625 
626  canonicalize_path(mangled);
627 
628  /* only absolute paths */
629  if (!is_absolute_path(mangled))
630  ereport(ERROR,
631  (errcode(ERRCODE_INVALID_NAME),
632  errmsg("component in parameter \"dynamic_library_path\" is not an absolute path")));
633 
634  full = palloc(strlen(mangled) + 1 + baselen + 1);
635  sprintf(full, "%s/%s", mangled, basename);
636  pfree(mangled);
637 
638  elog(DEBUG3, "find_in_dynamic_libpath: trying \"%s\"", full);
639 
640  if (file_exists(full))
641  return full;
642 
643  pfree(full);
644 
645  if (p[len] == '\0')
646  break;
647  else
648  p += len + 1;
649  }
650 
651  return NULL;
652 }
653 
654 
655 /*
656  * Find (or create) a rendezvous variable that one dynamically
657  * loaded library can use to meet up with another.
658  *
659  * On the first call of this function for a particular varName,
660  * a "rendezvous variable" is created with the given name.
661  * The value of the variable is a void pointer (initially set to NULL).
662  * Subsequent calls with the same varName just return the address of
663  * the existing variable. Once created, a rendezvous variable lasts
664  * for the life of the process.
665  *
666  * Dynamically loaded libraries can use rendezvous variables
667  * to find each other and share information: they just need to agree
668  * on the variable name and the data it will point to.
669  */
670 void **
671 find_rendezvous_variable(const char *varName)
672 {
673  static HTAB *rendezvousHash = NULL;
674 
675  rendezvousHashEntry *hentry;
676  bool found;
677 
678  /* Create a hashtable if we haven't already done so in this process */
679  if (rendezvousHash == NULL)
680  {
681  HASHCTL ctl;
682 
683  MemSet(&ctl, 0, sizeof(ctl));
684  ctl.keysize = NAMEDATALEN;
685  ctl.entrysize = sizeof(rendezvousHashEntry);
686  rendezvousHash = hash_create("Rendezvous variable hash",
687  16,
688  &ctl,
689  HASH_ELEM);
690  }
691 
692  /* Find or create the hashtable entry for this varName */
693  hentry = (rendezvousHashEntry *) hash_search(rendezvousHash,
694  varName,
695  HASH_ENTER,
696  &found);
697 
698  /* Initialize to NULL if first time */
699  if (!found)
700  hentry->varValue = NULL;
701 
702  return &hentry->varValue;
703 }
704 
705 /*
706  * Estimate the amount of space needed to serialize the list of libraries
707  * we have loaded.
708  */
709 Size
711 {
712  DynamicFileList *file_scanner;
713  Size size = 1;
714 
715  for (file_scanner = file_list;
716  file_scanner != NULL;
717  file_scanner = file_scanner->next)
718  size = add_size(size, strlen(file_scanner->filename) + 1);
719 
720  return size;
721 }
722 
723 /*
724  * Serialize the list of libraries we have loaded to a chunk of memory.
725  */
726 void
727 SerializeLibraryState(Size maxsize, char *start_address)
728 {
729  DynamicFileList *file_scanner;
730 
731  for (file_scanner = file_list;
732  file_scanner != NULL;
733  file_scanner = file_scanner->next)
734  {
735  Size len;
736 
737  len = strlcpy(start_address, file_scanner->filename, maxsize) + 1;
738  Assert(len < maxsize);
739  maxsize -= len;
740  start_address += len;
741  }
742  start_address[0] = '\0';
743 }
744 
745 /*
746  * Load every library the serializing backend had loaded.
747  */
748 void
749 RestoreLibraryState(char *start_address)
750 {
751  while (*start_address != '\0')
752  {
753  internal_load_library(start_address);
754  start_address += strlen(start_address) + 1;
755  }
756 }
char filename[FLEXIBLE_ARRAY_MEMBER]
Definition: dfmgr.c:64
Datum(* PGFunction)(FunctionCallInfo fcinfo)
Definition: fmgr.h:40
PGFunction lookup_external_function(void *filehandle, const char *funcname)
Definition: dfmgr.c:171
void * varValue
Definition: dfmgr.c:48
#define SAME_INODE(A, B)
Definition: dfmgr.c:72
int errhint(const char *fmt,...)
Definition: elog.c:1069
#define AssertState(condition)
Definition: c.h:742
int indexmaxkeys
Definition: fmgr.h:447
char * dlerror(void)
#define HASH_ELEM
Definition: hsearch.h:87
#define DEBUG3
Definition: elog.h:23
static void incompatible_module_error(const char *libname, const Pg_magic_struct *module_magic_data) pg_attribute_noreturn()
Definition: dfmgr.c:306
static char * substitute_libpath_macro(const char *name)
Definition: dfmgr.c:556
char * pstrdup(const char *in)
Definition: mcxt.c:1186
char * psprintf(const char *fmt,...)
Definition: psprintf.c:46
int namedatalen
Definition: fmgr.h:448
Size entrysize
Definition: hsearch.h:73
void canonicalize_path(char *path)
Definition: path.c:254
static DynamicFileList * file_list
Definition: dfmgr.c:67
int errcode(int sqlerrcode)
Definition: elog.c:608
struct df_files DynamicFileList
#define MemSet(start, val, len)
Definition: c.h:962
static char * expand_dynamic_library_name(const char *name)
Definition: dfmgr.c:486
#define false
Definition: c.h:317
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:906
static void internal_unload_library(const char *libname)
Definition: dfmgr.c:400
void ** find_rendezvous_variable(const char *varName)
Definition: dfmgr.c:671
static const Pg_magic_struct magic_data
Definition: dfmgr.c:90
const Pg_magic_struct *(* PGModuleMagicFunction)(void)
Definition: fmgr.h:467
void(* PG_init_t)(void)
Definition: dfmgr.c:41
int errdetail_internal(const char *fmt,...)
Definition: elog.c:982
#define malloc(a)
Definition: header.h:50
#define NAMEDATALEN
#define sprintf
Definition: port.h:194
Definition: dynahash.c:208
void pfree(void *pointer)
Definition: mcxt.c:1056
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:91
void SerializeLibraryState(Size maxsize, char *start_address)
Definition: dfmgr.c:727
#define ERROR
Definition: elog.h:43
#define RTLD_GLOBAL
Definition: port.h:469
static bool file_exists(const char *name)
Definition: dfmgr.c:454
char * Dynamic_library_path
Definition: dfmgr.c:77
int dlclose(void *handle)
void * handle
Definition: dfmgr.c:63
#define RTLD_NOW
Definition: port.h:461
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:176
int funcmaxargs
Definition: fmgr.h:446
int errdetail(const char *fmt,...)
Definition: elog.c:955
int errcode_for_file_access(void)
Definition: elog.c:631
#define is_absolute_path(filename)
Definition: port.h:86
void(* PG_fini_t)(void)
Definition: dfmgr.c:42
static void * internal_load_library(const char *libname)
Definition: dfmgr.c:184
PGFunction load_external_function(const char *filename, const char *funcname, bool signalNotFound, void **filehandle)
Definition: dfmgr.c:107
void clear_external_function_hash(void *filehandle)
Definition: fmgr.c:594
#define ereport(elevel, rest)
Definition: elog.h:141
#define AssertArg(condition)
Definition: c.h:741
void * dlopen(const char *file, int mode)
void appendStringInfoChar(StringInfo str, char ch)
Definition: stringinfo.c:188
void initStringInfo(StringInfo str)
Definition: stringinfo.c:59
#define stat(a, b)
Definition: win32_port.h:255
Definition: dfmgr.c:55
int float8byval
Definition: fmgr.h:449
#define PG_MAGIC_FUNCTION_NAME_STRING
Definition: fmgr.h:470
void RestoreLibraryState(char *start_address)
Definition: dfmgr.c:749
struct df_files * next
Definition: dfmgr.c:57
HTAB * hash_create(const char *tabname, long nelem, HASHCTL *info, int flags)
Definition: dynahash.c:316
char * first_dir_separator(const char *filename)
Definition: path.c:103
Size add_size(Size s1, Size s2)
Definition: shmem.c:475
Size EstimateLibraryStateSpace(void)
Definition: dfmgr.c:710
Size keysize
Definition: hsearch.h:72
dev_t device
Definition: dfmgr.c:58
#define free(a)
Definition: header.h:65
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
void * dlsym(void *handle, const char *symbol)
#define Assert(condition)
Definition: c.h:739
static void check_restricted_library_name(const char *name)
Definition: dfmgr.c:541
void load_file(const char *filename, bool restricted)
Definition: dfmgr.c:146
size_t Size
Definition: c.h:467
const char * name
Definition: encode.c:521
#define S_ISDIR(m)
Definition: win32_port.h:296
#define PG_MODULE_MAGIC_DATA
Definition: fmgr.h:453
#define pg_attribute_noreturn()
Definition: c.h:147
static DynamicFileList * file_tail
Definition: dfmgr.c:68
ino_t inode
Definition: dfmgr.c:61
void * palloc(Size size)
Definition: mcxt.c:949
int errmsg(const char *fmt,...)
Definition: elog.c:822
#define elog(elevel,...)
Definition: elog.h:228
#define snprintf
Definition: port.h:192
#define _(x)
Definition: elog.c:87
char pkglib_path[MAXPGPATH]
Definition: globals.c:73
static char * find_in_dynamic_libpath(const char *basename)
Definition: dfmgr.c:587
char * first_path_var_separator(const char *pathlist)
Definition: path.c:120
#define offsetof(type, field)
Definition: c.h:662
int version
Definition: fmgr.h:445