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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) 1996-2017, 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 #include "dynloader.h"
20 #include "lib/stringinfo.h"
21 #include "miscadmin.h"
22 #include "storage/shmem.h"
23 #include "utils/dynamic_loader.h"
24 #include "utils/hsearch.h"
25 
26 
27 /* signatures for PostgreSQL-specific library init/fini functions */
28 typedef void (*PG_init_t) (void);
29 typedef void (*PG_fini_t) (void);
30 
31 /* hashtable entry for rendezvous variables */
32 typedef struct
33 {
34  char varName[NAMEDATALEN]; /* hash key (must be first) */
35  void *varValue;
37 
38 /*
39  * List of dynamically loaded files (kept in malloc'd memory).
40  */
41 
42 typedef struct df_files
43 {
44  struct df_files *next; /* List link */
45  dev_t device; /* Device file is on */
46 #ifndef WIN32 /* ensures we never again depend on this under
47  * win32 */
48  ino_t inode; /* Inode number of file */
49 #endif
50  void *handle; /* a handle for pg_dl* functions */
51  char filename[FLEXIBLE_ARRAY_MEMBER]; /* Full pathname of file */
53 
56 
57 /* stat() call under Win32 returns an st_ino field, but it has no meaning */
58 #ifndef WIN32
59 #define SAME_INODE(A,B) ((A).st_ino == (B).inode && (A).st_dev == (B).device)
60 #else
61 #define SAME_INODE(A,B) false
62 #endif
63 
65 
66 static void *internal_load_library(const char *libname);
67 static void incompatible_module_error(const char *libname,
68  const Pg_magic_struct *module_magic_data) pg_attribute_noreturn();
69 static void internal_unload_library(const char *libname);
70 static bool file_exists(const char *name);
71 static char *expand_dynamic_library_name(const char *name);
72 static void check_restricted_library_name(const char *name);
73 static char *substitute_libpath_macro(const char *name);
74 static char *find_in_dynamic_libpath(const char *basename);
75 
76 /* Magic structure that module needs to match to be accepted */
78 
79 
80 /*
81  * Load the specified dynamic-link library file, and look for a function
82  * named funcname in it.
83  *
84  * If the function is not found, we raise an error if signalNotFound is true,
85  * else return (PGFunction) NULL. Note that errors in loading the library
86  * will provoke ereport() regardless of signalNotFound.
87  *
88  * If filehandle is not NULL, then *filehandle will be set to a handle
89  * identifying the library file. The filehandle can be used with
90  * lookup_external_function to lookup additional functions in the same file
91  * at less cost than repeating load_external_function.
92  */
94 load_external_function(const char *filename, const char *funcname,
95  bool signalNotFound, void **filehandle)
96 {
97  char *fullname;
98  void *lib_handle;
99  PGFunction retval;
100 
101  /* Expand the possibly-abbreviated filename to an exact path name */
102  fullname = expand_dynamic_library_name(filename);
103 
104  /* Load the shared library, unless we already did */
105  lib_handle = internal_load_library(fullname);
106 
107  /* Return handle if caller wants it */
108  if (filehandle)
109  *filehandle = lib_handle;
110 
111  /*
112  * Look up the function within the library. According to POSIX dlsym()
113  * should declare its second argument as "const char *", but older
114  * platforms might not, so for the time being we just cast away const.
115  */
116  retval = (PGFunction) pg_dlsym(lib_handle, (char *) funcname);
117 
118  if (retval == NULL && signalNotFound)
119  ereport(ERROR,
120  (errcode(ERRCODE_UNDEFINED_FUNCTION),
121  errmsg("could not find function \"%s\" in file \"%s\"",
122  funcname, fullname)));
123 
124  pfree(fullname);
125  return retval;
126 }
127 
128 /*
129  * This function loads a shlib file without looking up any particular
130  * function in it. If the same shlib has previously been loaded,
131  * unload and reload it.
132  *
133  * When 'restricted' is true, only libraries in the presumed-secure
134  * directory $libdir/plugins may be referenced.
135  */
136 void
137 load_file(const char *filename, bool restricted)
138 {
139  char *fullname;
140 
141  /* Apply security restriction if requested */
142  if (restricted)
144 
145  /* Expand the possibly-abbreviated filename to an exact path name */
146  fullname = expand_dynamic_library_name(filename);
147 
148  /* Unload the library if currently loaded */
149  internal_unload_library(fullname);
150 
151  /* Load the shared library */
152  (void) internal_load_library(fullname);
153 
154  pfree(fullname);
155 }
156 
157 /*
158  * Lookup a function whose library file is already loaded.
159  * Return (PGFunction) NULL if not found.
160  */
162 lookup_external_function(void *filehandle, const char *funcname)
163 {
164  /* as above, cast away const for the time being */
165  return (PGFunction) pg_dlsym(filehandle, (char *) funcname);
166 }
167 
168 
169 /*
170  * Load the specified dynamic-link library file, unless it already is
171  * loaded. Return the pg_dl* handle for the file.
172  *
173  * Note: libname is expected to be an exact name for the library file.
174  */
175 static void *
176 internal_load_library(const char *libname)
177 {
178  DynamicFileList *file_scanner;
179  PGModuleMagicFunction magic_func;
180  char *load_error;
181  struct stat stat_buf;
182  PG_init_t PG_init;
183 
184  /*
185  * Scan the list of loaded FILES to see if the file has been loaded.
186  */
187  for (file_scanner = file_list;
188  file_scanner != NULL &&
189  strcmp(libname, file_scanner->filename) != 0;
190  file_scanner = file_scanner->next)
191  ;
192 
193  if (file_scanner == NULL)
194  {
195  /*
196  * Check for same files - different paths (ie, symlink or link)
197  */
198  if (stat(libname, &stat_buf) == -1)
199  ereport(ERROR,
201  errmsg("could not access file \"%s\": %m",
202  libname)));
203 
204  for (file_scanner = file_list;
205  file_scanner != NULL &&
206  !SAME_INODE(stat_buf, *file_scanner);
207  file_scanner = file_scanner->next)
208  ;
209  }
210 
211  if (file_scanner == NULL)
212  {
213  /*
214  * File not loaded yet.
215  */
216  file_scanner = (DynamicFileList *)
217  malloc(offsetof(DynamicFileList, filename) +strlen(libname) + 1);
218  if (file_scanner == NULL)
219  ereport(ERROR,
220  (errcode(ERRCODE_OUT_OF_MEMORY),
221  errmsg("out of memory")));
222 
223  MemSet(file_scanner, 0, offsetof(DynamicFileList, filename));
224  strcpy(file_scanner->filename, libname);
225  file_scanner->device = stat_buf.st_dev;
226 #ifndef WIN32
227  file_scanner->inode = stat_buf.st_ino;
228 #endif
229  file_scanner->next = NULL;
230 
231  file_scanner->handle = pg_dlopen(file_scanner->filename);
232  if (file_scanner->handle == NULL)
233  {
234  load_error = (char *) pg_dlerror();
235  free((char *) file_scanner);
236  /* errcode_for_file_access might not be appropriate here? */
237  ereport(ERROR,
239  errmsg("could not load library \"%s\": %s",
240  libname, load_error)));
241  }
242 
243  /* Check the magic function to determine compatibility */
244  magic_func = (PGModuleMagicFunction)
246  if (magic_func)
247  {
248  const Pg_magic_struct *magic_data_ptr = (*magic_func) ();
249 
250  if (magic_data_ptr->len != magic_data.len ||
251  memcmp(magic_data_ptr, &magic_data, magic_data.len) != 0)
252  {
253  /* copy data block before unlinking library */
254  Pg_magic_struct module_magic_data = *magic_data_ptr;
255 
256  /* try to unlink library */
257  pg_dlclose(file_scanner->handle);
258  free((char *) file_scanner);
259 
260  /* issue suitable complaint */
261  incompatible_module_error(libname, &module_magic_data);
262  }
263  }
264  else
265  {
266  /* try to unlink library */
267  pg_dlclose(file_scanner->handle);
268  free((char *) file_scanner);
269  /* complain */
270  ereport(ERROR,
271  (errmsg("incompatible library \"%s\": missing magic block",
272  libname),
273  errhint("Extension libraries are required to use the PG_MODULE_MAGIC macro.")));
274  }
275 
276  /*
277  * If the library has a _PG_init() function, call it.
278  */
279  PG_init = (PG_init_t) pg_dlsym(file_scanner->handle, "_PG_init");
280  if (PG_init)
281  (*PG_init) ();
282 
283  /* OK to link it into list */
284  if (file_list == NULL)
285  file_list = file_scanner;
286  else
287  file_tail->next = file_scanner;
288  file_tail = file_scanner;
289  }
290 
291  return file_scanner->handle;
292 }
293 
294 /*
295  * Report a suitable error for an incompatible magic block.
296  */
297 static void
298 incompatible_module_error(const char *libname,
299  const Pg_magic_struct *module_magic_data)
300 {
301  StringInfoData details;
302 
303  /*
304  * If the version doesn't match, just report that, because the rest of the
305  * block might not even have the fields we expect.
306  */
307  if (magic_data.version != module_magic_data->version)
308  {
309  char library_version[32];
310 
311  if (module_magic_data->version >= 1000)
312  snprintf(library_version, sizeof(library_version), "%d",
313  module_magic_data->version / 100);
314  else
315  snprintf(library_version, sizeof(library_version), "%d.%d",
316  module_magic_data->version / 100,
317  module_magic_data->version % 100);
318  ereport(ERROR,
319  (errmsg("incompatible library \"%s\": version mismatch",
320  libname),
321  errdetail("Server is version %d, library is version %s.",
322  magic_data.version / 100, library_version)));
323  }
324 
325  /*
326  * Otherwise, spell out which fields don't agree.
327  *
328  * XXX this code has to be adjusted any time the set of fields in a magic
329  * block change!
330  */
331  initStringInfo(&details);
332 
333  if (module_magic_data->funcmaxargs != magic_data.funcmaxargs)
334  {
335  if (details.len)
336  appendStringInfoChar(&details, '\n');
337  appendStringInfo(&details,
338  _("Server has FUNC_MAX_ARGS = %d, library has %d."),
339  magic_data.funcmaxargs,
340  module_magic_data->funcmaxargs);
341  }
342  if (module_magic_data->indexmaxkeys != magic_data.indexmaxkeys)
343  {
344  if (details.len)
345  appendStringInfoChar(&details, '\n');
346  appendStringInfo(&details,
347  _("Server has INDEX_MAX_KEYS = %d, library has %d."),
348  magic_data.indexmaxkeys,
349  module_magic_data->indexmaxkeys);
350  }
351  if (module_magic_data->namedatalen != magic_data.namedatalen)
352  {
353  if (details.len)
354  appendStringInfoChar(&details, '\n');
355  appendStringInfo(&details,
356  _("Server has NAMEDATALEN = %d, library has %d."),
357  magic_data.namedatalen,
358  module_magic_data->namedatalen);
359  }
360  if (module_magic_data->float4byval != magic_data.float4byval)
361  {
362  if (details.len)
363  appendStringInfoChar(&details, '\n');
364  appendStringInfo(&details,
365  _("Server has FLOAT4PASSBYVAL = %s, library has %s."),
366  magic_data.float4byval ? "true" : "false",
367  module_magic_data->float4byval ? "true" : "false");
368  }
369  if (module_magic_data->float8byval != magic_data.float8byval)
370  {
371  if (details.len)
372  appendStringInfoChar(&details, '\n');
373  appendStringInfo(&details,
374  _("Server has FLOAT8PASSBYVAL = %s, library has %s."),
375  magic_data.float8byval ? "true" : "false",
376  module_magic_data->float8byval ? "true" : "false");
377  }
378 
379  if (details.len == 0)
380  appendStringInfoString(&details,
381  _("Magic block has unexpected length or padding difference."));
382 
383  ereport(ERROR,
384  (errmsg("incompatible library \"%s\": magic block mismatch",
385  libname),
386  errdetail_internal("%s", details.data)));
387 }
388 
389 /*
390  * Unload the specified dynamic-link library file, if it is loaded.
391  *
392  * Note: libname is expected to be an exact name for the library file.
393  *
394  * XXX for the moment, this is disabled, resulting in LOAD of an already-loaded
395  * library always being a no-op. We might re-enable it someday if we can
396  * convince ourselves we have safe protocols for un-hooking from hook function
397  * pointers, releasing custom GUC variables, and perhaps other things that
398  * are definitely unsafe currently.
399  */
400 static void
401 internal_unload_library(const char *libname)
402 {
403 #ifdef NOT_USED
404  DynamicFileList *file_scanner,
405  *prv,
406  *nxt;
407  struct stat stat_buf;
408  PG_fini_t PG_fini;
409 
410  /*
411  * We need to do stat() in order to determine whether this is the same
412  * file as a previously loaded file; it's also handy so as to give a good
413  * error message if bogus file name given.
414  */
415  if (stat(libname, &stat_buf) == -1)
416  ereport(ERROR,
418  errmsg("could not access file \"%s\": %m", libname)));
419 
420  /*
421  * We have to zap all entries in the list that match on either filename or
422  * inode, else internal_load_library() will still think it's present.
423  */
424  prv = NULL;
425  for (file_scanner = file_list; file_scanner != NULL; file_scanner = nxt)
426  {
427  nxt = file_scanner->next;
428  if (strcmp(libname, file_scanner->filename) == 0 ||
429  SAME_INODE(stat_buf, *file_scanner))
430  {
431  if (prv)
432  prv->next = nxt;
433  else
434  file_list = nxt;
435 
436  /*
437  * If the library has a _PG_fini() function, call it.
438  */
439  PG_fini = (PG_fini_t) pg_dlsym(file_scanner->handle, "_PG_fini");
440  if (PG_fini)
441  (*PG_fini) ();
442 
443  clear_external_function_hash(file_scanner->handle);
444  pg_dlclose(file_scanner->handle);
445  free((char *) file_scanner);
446  /* prv does not change */
447  }
448  else
449  prv = file_scanner;
450  }
451 #endif /* NOT_USED */
452 }
453 
454 static bool
455 file_exists(const char *name)
456 {
457  struct stat st;
458 
459  AssertArg(name != NULL);
460 
461  if (stat(name, &st) == 0)
462  return S_ISDIR(st.st_mode) ? false : true;
463  else if (!(errno == ENOENT || errno == ENOTDIR || errno == EACCES))
464  ereport(ERROR,
466  errmsg("could not access file \"%s\": %m", name)));
467 
468  return false;
469 }
470 
471 
472 /* Example format: ".so" */
473 #ifndef DLSUFFIX
474 #error "DLSUFFIX must be defined to compile this file."
475 #endif
476 
477 /*
478  * If name contains a slash, check if the file exists, if so return
479  * the name. Else (no slash) try to expand using search path (see
480  * find_in_dynamic_libpath below); if that works, return the fully
481  * expanded file name. If the previous failed, append DLSUFFIX and
482  * try again. If all fails, just return the original name.
483  *
484  * The result will always be freshly palloc'd.
485  */
486 static char *
488 {
489  bool have_slash;
490  char *new;
491  char *full;
492 
493  AssertArg(name);
494 
495  have_slash = (first_dir_separator(name) != NULL);
496 
497  if (!have_slash)
498  {
499  full = find_in_dynamic_libpath(name);
500  if (full)
501  return full;
502  }
503  else
504  {
505  full = substitute_libpath_macro(name);
506  if (file_exists(full))
507  return full;
508  pfree(full);
509  }
510 
511  new = psprintf("%s%s", name, DLSUFFIX);
512 
513  if (!have_slash)
514  {
515  full = find_in_dynamic_libpath(new);
516  pfree(new);
517  if (full)
518  return full;
519  }
520  else
521  {
522  full = substitute_libpath_macro(new);
523  pfree(new);
524  if (file_exists(full))
525  return full;
526  pfree(full);
527  }
528 
529  /*
530  * If we can't find the file, just return the string as-is. The ensuing
531  * load attempt will fail and report a suitable message.
532  */
533  return pstrdup(name);
534 }
535 
536 /*
537  * Check a restricted library name. It must begin with "$libdir/plugins/"
538  * and there must not be any directory separators after that (this is
539  * sufficient to prevent ".." style attacks).
540  */
541 static void
543 {
544  if (strncmp(name, "$libdir/plugins/", 16) != 0 ||
545  first_dir_separator(name + 16) != NULL)
546  ereport(ERROR,
547  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
548  errmsg("access to library \"%s\" is not allowed",
549  name)));
550 }
551 
552 /*
553  * Substitute for any macros appearing in the given string.
554  * Result is always freshly palloc'd.
555  */
556 static char *
558 {
559  const char *sep_ptr;
560 
561  AssertArg(name != NULL);
562 
563  /* Currently, we only recognize $libdir at the start of the string */
564  if (name[0] != '$')
565  return pstrdup(name);
566 
567  if ((sep_ptr = first_dir_separator(name)) == NULL)
568  sep_ptr = name + strlen(name);
569 
570  if (strlen("$libdir") != sep_ptr - name ||
571  strncmp(name, "$libdir", strlen("$libdir")) != 0)
572  ereport(ERROR,
573  (errcode(ERRCODE_INVALID_NAME),
574  errmsg("invalid macro name in dynamic library path: %s",
575  name)));
576 
577  return psprintf("%s%s", pkglib_path, sep_ptr);
578 }
579 
580 
581 /*
582  * Search for a file called 'basename' in the colon-separated search
583  * path Dynamic_library_path. If the file is found, the full file name
584  * is returned in freshly palloc'd memory. If the file is not found,
585  * return NULL.
586  */
587 static char *
588 find_in_dynamic_libpath(const char *basename)
589 {
590  const char *p;
591  size_t baselen;
592 
593  AssertArg(basename != NULL);
594  AssertArg(first_dir_separator(basename) == NULL);
596 
598  if (strlen(p) == 0)
599  return NULL;
600 
601  baselen = strlen(basename);
602 
603  for (;;)
604  {
605  size_t len;
606  char *piece;
607  char *mangled;
608  char *full;
609 
610  piece = first_path_var_separator(p);
611  if (piece == p)
612  ereport(ERROR,
613  (errcode(ERRCODE_INVALID_NAME),
614  errmsg("zero-length component in parameter \"dynamic_library_path\"")));
615 
616  if (piece == NULL)
617  len = strlen(p);
618  else
619  len = piece - p;
620 
621  piece = palloc(len + 1);
622  strlcpy(piece, p, len + 1);
623 
624  mangled = substitute_libpath_macro(piece);
625  pfree(piece);
626 
627  canonicalize_path(mangled);
628 
629  /* only absolute paths */
630  if (!is_absolute_path(mangled))
631  ereport(ERROR,
632  (errcode(ERRCODE_INVALID_NAME),
633  errmsg("component in parameter \"dynamic_library_path\" is not an absolute path")));
634 
635  full = palloc(strlen(mangled) + 1 + baselen + 1);
636  sprintf(full, "%s/%s", mangled, basename);
637  pfree(mangled);
638 
639  elog(DEBUG3, "find_in_dynamic_libpath: trying \"%s\"", full);
640 
641  if (file_exists(full))
642  return full;
643 
644  pfree(full);
645 
646  if (p[len] == '\0')
647  break;
648  else
649  p += len + 1;
650  }
651 
652  return NULL;
653 }
654 
655 
656 /*
657  * Find (or create) a rendezvous variable that one dynamically
658  * loaded library can use to meet up with another.
659  *
660  * On the first call of this function for a particular varName,
661  * a "rendezvous variable" is created with the given name.
662  * The value of the variable is a void pointer (initially set to NULL).
663  * Subsequent calls with the same varName just return the address of
664  * the existing variable. Once created, a rendezvous variable lasts
665  * for the life of the process.
666  *
667  * Dynamically loaded libraries can use rendezvous variables
668  * to find each other and share information: they just need to agree
669  * on the variable name and the data it will point to.
670  */
671 void **
672 find_rendezvous_variable(const char *varName)
673 {
674  static HTAB *rendezvousHash = NULL;
675 
676  rendezvousHashEntry *hentry;
677  bool found;
678 
679  /* Create a hashtable if we haven't already done so in this process */
680  if (rendezvousHash == NULL)
681  {
682  HASHCTL ctl;
683 
684  MemSet(&ctl, 0, sizeof(ctl));
685  ctl.keysize = NAMEDATALEN;
686  ctl.entrysize = sizeof(rendezvousHashEntry);
687  rendezvousHash = hash_create("Rendezvous variable hash",
688  16,
689  &ctl,
690  HASH_ELEM);
691  }
692 
693  /* Find or create the hashtable entry for this varName */
694  hentry = (rendezvousHashEntry *) hash_search(rendezvousHash,
695  varName,
696  HASH_ENTER,
697  &found);
698 
699  /* Initialize to NULL if first time */
700  if (!found)
701  hentry->varValue = NULL;
702 
703  return &hentry->varValue;
704 }
705 
706 /*
707  * Estimate the amount of space needed to serialize the list of libraries
708  * we have loaded.
709  */
710 Size
712 {
713  DynamicFileList *file_scanner;
714  Size size = 1;
715 
716  for (file_scanner = file_list;
717  file_scanner != NULL;
718  file_scanner = file_scanner->next)
719  size = add_size(size, strlen(file_scanner->filename) + 1);
720 
721  return size;
722 }
723 
724 /*
725  * Serialize the list of libraries we have loaded to a chunk of memory.
726  */
727 void
728 SerializeLibraryState(Size maxsize, char *start_address)
729 {
730  DynamicFileList *file_scanner;
731 
732  for (file_scanner = file_list;
733  file_scanner != NULL;
734  file_scanner = file_scanner->next)
735  {
736  Size len;
737 
738  len = strlcpy(start_address, file_scanner->filename, maxsize) + 1;
739  Assert(len < maxsize);
740  maxsize -= len;
741  start_address += len;
742  }
743  start_address[0] = '\0';
744 }
745 
746 /*
747  * Load every library the serializing backend had loaded.
748  */
749 void
750 RestoreLibraryState(char *start_address)
751 {
752  while (*start_address != '\0')
753  {
754  internal_load_library(start_address);
755  start_address += strlen(start_address) + 1;
756  }
757 }
char filename[FLEXIBLE_ARRAY_MEMBER]
Definition: dfmgr.c:51
PGFunction lookup_external_function(void *filehandle, const char *funcname)
Definition: dfmgr.c:162
void * varValue
Definition: dfmgr.c:35
#define SAME_INODE(A, B)
Definition: dfmgr.c:59
int errhint(const char *fmt,...)
Definition: elog.c:987
#define AssertState(condition)
Definition: c.h:678
int indexmaxkeys
Definition: fmgr.h:416
#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:298
static char * substitute_libpath_macro(const char *name)
Definition: dfmgr.c:557
Datum(* PGFunction)(FunctionCallInfo fcinfo)
Definition: fmgr.h:40
char * pstrdup(const char *in)
Definition: mcxt.c:1077
char * psprintf(const char *fmt,...)
Definition: psprintf.c:46
int namedatalen
Definition: fmgr.h:417
Size entrysize
Definition: hsearch.h:73
void canonicalize_path(char *path)
Definition: path.c:254
static DynamicFileList * file_list
Definition: dfmgr.c:54
int errcode(int sqlerrcode)
Definition: elog.c:575
struct df_files DynamicFileList
#define MemSet(start, val, len)
Definition: c.h:857
#define pg_dlclose(h)
Definition: aix.h:36
int snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3
static char * expand_dynamic_library_name(const char *name)
Definition: dfmgr.c:487
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:885
static void internal_unload_library(const char *libname)
Definition: dfmgr.c:401
void ** find_rendezvous_variable(const char *varName)
Definition: dfmgr.c:672
static const Pg_magic_struct magic_data
Definition: dfmgr.c:77
#define pg_dlopen(f)
Definition: aix.h:34
int errdetail_internal(const char *fmt,...)
Definition: elog.c:900
#define malloc(a)
Definition: header.h:50
#define NAMEDATALEN
Definition: dynahash.c:193
void pfree(void *pointer)
Definition: mcxt.c:950
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:110
void SerializeLibraryState(Size maxsize, char *start_address)
Definition: dfmgr.c:728
#define ERROR
Definition: elog.h:43
static bool file_exists(const char *name)
Definition: dfmgr.c:455
char * Dynamic_library_path
Definition: dfmgr.c:64
void * handle
Definition: dfmgr.c:50
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:189
int funcmaxargs
Definition: fmgr.h:415
int errdetail(const char *fmt,...)
Definition: elog.c:873
int errcode_for_file_access(void)
Definition: elog.c:598
#define is_absolute_path(filename)
Definition: port.h:77
static void * internal_load_library(const char *libname)
Definition: dfmgr.c:176
PGFunction load_external_function(const char *filename, const char *funcname, bool signalNotFound, void **filehandle)
Definition: dfmgr.c:94
void clear_external_function_hash(void *filehandle)
Definition: fmgr.c:508
#define ereport(elevel, rest)
Definition: elog.h:122
#define AssertArg(condition)
Definition: c.h:677
#define pg_dlerror()
Definition: aix.h:37
void appendStringInfoChar(StringInfo str, char ch)
Definition: stringinfo.c:201
void initStringInfo(StringInfo str)
Definition: stringinfo.c:65
Definition: dfmgr.c:42
int float8byval
Definition: fmgr.h:419
#define PG_MAGIC_FUNCTION_NAME_STRING
Definition: fmgr.h:441
void RestoreLibraryState(char *start_address)
Definition: dfmgr.c:750
struct df_files * next
Definition: dfmgr.c:44
HTAB * hash_create(const char *tabname, long nelem, HASHCTL *info, int flags)
Definition: dynahash.c:301
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:711
Size keysize
Definition: hsearch.h:72
dev_t device
Definition: dfmgr.c:45
#define free(a)
Definition: header.h:65
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
#define NULL
Definition: c.h:229
#define Assert(condition)
Definition: c.h:675
static void check_restricted_library_name(const char *name)
Definition: dfmgr.c:542
void load_file(const char *filename, bool restricted)
Definition: dfmgr.c:137
#define pg_dlsym(h, f)
Definition: aix.h:35
size_t Size
Definition: c.h:356
void(* PG_init_t)(void)
Definition: dfmgr.c:28
const char * name
Definition: encode.c:521
int float4byval
Definition: fmgr.h:418
#define PG_MODULE_MAGIC_DATA
Definition: fmgr.h:423
#define pg_attribute_noreturn()
Definition: c.h:653
static DynamicFileList * file_tail
Definition: dfmgr.c:55
ino_t inode
Definition: dfmgr.c:48
static char * filename
Definition: pg_dumpall.c:87
void * palloc(Size size)
Definition: mcxt.c:849
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define elog
Definition: elog.h:219
const Pg_magic_struct *(* PGModuleMagicFunction)(void)
Definition: fmgr.h:438
#define _(x)
Definition: elog.c:84
char pkglib_path[MAXPGPATH]
Definition: globals.c:64
static char * find_in_dynamic_libpath(const char *basename)
Definition: dfmgr.c:588
char * first_path_var_separator(const char *pathlist)
Definition: path.c:120
#define offsetof(type, field)
Definition: c.h:555
int version
Definition: fmgr.h:414
void(* PG_fini_t)(void)
Definition: dfmgr.c:29