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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) 1996-2024, 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 #ifndef WIN32
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 /* !WIN32 */
32 
33 #include "fmgr.h"
34 #include "lib/stringinfo.h"
35 #include "miscadmin.h"
36 #include "storage/fd.h"
37 #include "storage/shmem.h"
38 #include "utils/hsearch.h"
39 
40 
41 /* signature for PostgreSQL-specific library init function */
42 typedef void (*PG_init_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 char *expand_dynamic_library_name(const char *name);
83 static void check_restricted_library_name(const char *name);
84 static char *substitute_libpath_macro(const char *name);
85 static char *find_in_dynamic_libpath(const char *basename);
86 
87 /* Magic structure that module needs to match to be accepted */
89 
90 
91 /*
92  * Load the specified dynamic-link library file, and look for a function
93  * named funcname in it.
94  *
95  * If the function is not found, we raise an error if signalNotFound is true,
96  * else return NULL. Note that errors in loading the library
97  * will provoke ereport() regardless of signalNotFound.
98  *
99  * If filehandle is not NULL, then *filehandle will be set to a handle
100  * identifying the library file. The filehandle can be used with
101  * lookup_external_function to lookup additional functions in the same file
102  * at less cost than repeating load_external_function.
103  */
104 void *
105 load_external_function(const char *filename, const char *funcname,
106  bool signalNotFound, void **filehandle)
107 {
108  char *fullname;
109  void *lib_handle;
110  void *retval;
111 
112  /* Expand the possibly-abbreviated filename to an exact path name */
114 
115  /* Load the shared library, unless we already did */
116  lib_handle = internal_load_library(fullname);
117 
118  /* Return handle if caller wants it */
119  if (filehandle)
120  *filehandle = lib_handle;
121 
122  /* Look up the function within the library. */
123  retval = dlsym(lib_handle, funcname);
124 
125  if (retval == NULL && signalNotFound)
126  ereport(ERROR,
127  (errcode(ERRCODE_UNDEFINED_FUNCTION),
128  errmsg("could not find function \"%s\" in file \"%s\"",
129  funcname, fullname)));
130 
131  pfree(fullname);
132  return retval;
133 }
134 
135 /*
136  * This function loads a shlib file without looking up any particular
137  * function in it. If the same shlib has previously been loaded,
138  * unload and reload it.
139  *
140  * When 'restricted' is true, only libraries in the presumed-secure
141  * directory $libdir/plugins may be referenced.
142  */
143 void
144 load_file(const char *filename, bool restricted)
145 {
146  char *fullname;
147 
148  /* Apply security restriction if requested */
149  if (restricted)
151 
152  /* Expand the possibly-abbreviated filename to an exact path name */
154 
155  /* Load the shared library */
156  (void) internal_load_library(fullname);
157 
158  pfree(fullname);
159 }
160 
161 /*
162  * Lookup a function whose library file is already loaded.
163  * Return NULL if not found.
164  */
165 void *
166 lookup_external_function(void *filehandle, const char *funcname)
167 {
168  return dlsym(filehandle, funcname);
169 }
170 
171 
172 /*
173  * Load the specified dynamic-link library file, unless it already is
174  * loaded. Return the pg_dl* handle for the file.
175  *
176  * Note: libname is expected to be an exact name for the library file.
177  *
178  * NB: There is presently no way to unload a dynamically loaded file. We might
179  * add one someday if we can convince ourselves we have safe protocols for un-
180  * hooking from hook function pointers, releasing custom GUC variables, and
181  * perhaps other things that are definitely unsafe currently.
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(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(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(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  * Similarly, if the ABI extra field doesn't match, error out. Other
335  * fields below might also mismatch, but that isn't useful information if
336  * you're using the wrong product altogether.
337  */
338  if (strcmp(module_magic_data->abi_extra, magic_data.abi_extra) != 0)
339  {
340  ereport(ERROR,
341  (errmsg("incompatible library \"%s\": ABI mismatch",
342  libname),
343  errdetail("Server has ABI \"%s\", library has \"%s\".",
345  module_magic_data->abi_extra)));
346  }
347 
348  /*
349  * Otherwise, spell out which fields don't agree.
350  *
351  * XXX this code has to be adjusted any time the set of fields in a magic
352  * block change!
353  */
354  initStringInfo(&details);
355 
356  if (module_magic_data->funcmaxargs != magic_data.funcmaxargs)
357  {
358  if (details.len)
359  appendStringInfoChar(&details, '\n');
360  appendStringInfo(&details,
361  /* translator: %s is a variable name and %d its values */
362  _("Server has %s = %d, library has %d."),
363  "FUNC_MAX_ARGS", magic_data.funcmaxargs,
364  module_magic_data->funcmaxargs);
365  }
366  if (module_magic_data->indexmaxkeys != magic_data.indexmaxkeys)
367  {
368  if (details.len)
369  appendStringInfoChar(&details, '\n');
370  appendStringInfo(&details,
371  /* translator: %s is a variable name and %d its values */
372  _("Server has %s = %d, library has %d."),
373  "INDEX_MAX_KEYS", magic_data.indexmaxkeys,
374  module_magic_data->indexmaxkeys);
375  }
376  if (module_magic_data->namedatalen != magic_data.namedatalen)
377  {
378  if (details.len)
379  appendStringInfoChar(&details, '\n');
380  appendStringInfo(&details,
381  /* translator: %s is a variable name and %d its values */
382  _("Server has %s = %d, library has %d."),
383  "NAMEDATALEN", magic_data.namedatalen,
384  module_magic_data->namedatalen);
385  }
386  if (module_magic_data->float8byval != magic_data.float8byval)
387  {
388  if (details.len)
389  appendStringInfoChar(&details, '\n');
390  appendStringInfo(&details,
391  /* translator: %s is a variable name and %d its values */
392  _("Server has %s = %s, library has %s."),
393  "FLOAT8PASSBYVAL", magic_data.float8byval ? "true" : "false",
394  module_magic_data->float8byval ? "true" : "false");
395  }
396 
397  if (details.len == 0)
398  appendStringInfoString(&details,
399  _("Magic block has unexpected length or padding difference."));
400 
401  ereport(ERROR,
402  (errmsg("incompatible library \"%s\": magic block mismatch",
403  libname),
404  errdetail_internal("%s", details.data)));
405 }
406 
407 
408 /*
409  * If name contains a slash, check if the file exists, if so return
410  * the name. Else (no slash) try to expand using search path (see
411  * find_in_dynamic_libpath below); if that works, return the fully
412  * expanded file name. If the previous failed, append DLSUFFIX and
413  * try again. If all fails, just return the original name.
414  *
415  * The result will always be freshly palloc'd.
416  */
417 static char *
419 {
420  bool have_slash;
421  char *new;
422  char *full;
423 
424  Assert(name);
425 
426  have_slash = (first_dir_separator(name) != NULL);
427 
428  if (!have_slash)
429  {
431  if (full)
432  return full;
433  }
434  else
435  {
437  if (pg_file_exists(full))
438  return full;
439  pfree(full);
440  }
441 
442  new = psprintf("%s%s", name, DLSUFFIX);
443 
444  if (!have_slash)
445  {
446  full = find_in_dynamic_libpath(new);
447  pfree(new);
448  if (full)
449  return full;
450  }
451  else
452  {
453  full = substitute_libpath_macro(new);
454  pfree(new);
455  if (pg_file_exists(full))
456  return full;
457  pfree(full);
458  }
459 
460  /*
461  * If we can't find the file, just return the string as-is. The ensuing
462  * load attempt will fail and report a suitable message.
463  */
464  return pstrdup(name);
465 }
466 
467 /*
468  * Check a restricted library name. It must begin with "$libdir/plugins/"
469  * and there must not be any directory separators after that (this is
470  * sufficient to prevent ".." style attacks).
471  */
472 static void
474 {
475  if (strncmp(name, "$libdir/plugins/", 16) != 0 ||
476  first_dir_separator(name + 16) != NULL)
477  ereport(ERROR,
478  (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
479  errmsg("access to library \"%s\" is not allowed",
480  name)));
481 }
482 
483 /*
484  * Substitute for any macros appearing in the given string.
485  * Result is always freshly palloc'd.
486  */
487 static char *
489 {
490  const char *sep_ptr;
491 
492  Assert(name != NULL);
493 
494  /* Currently, we only recognize $libdir at the start of the string */
495  if (name[0] != '$')
496  return pstrdup(name);
497 
498  if ((sep_ptr = first_dir_separator(name)) == NULL)
499  sep_ptr = name + strlen(name);
500 
501  if (strlen("$libdir") != sep_ptr - name ||
502  strncmp(name, "$libdir", strlen("$libdir")) != 0)
503  ereport(ERROR,
504  (errcode(ERRCODE_INVALID_NAME),
505  errmsg("invalid macro name in dynamic library path: %s",
506  name)));
507 
508  return psprintf("%s%s", pkglib_path, sep_ptr);
509 }
510 
511 
512 /*
513  * Search for a file called 'basename' in the colon-separated search
514  * path Dynamic_library_path. If the file is found, the full file name
515  * is returned in freshly palloc'd memory. If the file is not found,
516  * return NULL.
517  */
518 static char *
519 find_in_dynamic_libpath(const char *basename)
520 {
521  const char *p;
522  size_t baselen;
523 
524  Assert(basename != NULL);
525  Assert(first_dir_separator(basename) == NULL);
526  Assert(Dynamic_library_path != NULL);
527 
529  if (strlen(p) == 0)
530  return NULL;
531 
532  baselen = strlen(basename);
533 
534  for (;;)
535  {
536  size_t len;
537  char *piece;
538  char *mangled;
539  char *full;
540 
541  piece = first_path_var_separator(p);
542  if (piece == p)
543  ereport(ERROR,
544  (errcode(ERRCODE_INVALID_NAME),
545  errmsg("zero-length component in parameter \"dynamic_library_path\"")));
546 
547  if (piece == NULL)
548  len = strlen(p);
549  else
550  len = piece - p;
551 
552  piece = palloc(len + 1);
553  strlcpy(piece, p, len + 1);
554 
555  mangled = substitute_libpath_macro(piece);
556  pfree(piece);
557 
558  canonicalize_path(mangled);
559 
560  /* only absolute paths */
561  if (!is_absolute_path(mangled))
562  ereport(ERROR,
563  (errcode(ERRCODE_INVALID_NAME),
564  errmsg("component in parameter \"dynamic_library_path\" is not an absolute path")));
565 
566  full = palloc(strlen(mangled) + 1 + baselen + 1);
567  sprintf(full, "%s/%s", mangled, basename);
568  pfree(mangled);
569 
570  elog(DEBUG3, "find_in_dynamic_libpath: trying \"%s\"", full);
571 
572  if (pg_file_exists(full))
573  return full;
574 
575  pfree(full);
576 
577  if (p[len] == '\0')
578  break;
579  else
580  p += len + 1;
581  }
582 
583  return NULL;
584 }
585 
586 
587 /*
588  * Find (or create) a rendezvous variable that one dynamically
589  * loaded library can use to meet up with another.
590  *
591  * On the first call of this function for a particular varName,
592  * a "rendezvous variable" is created with the given name.
593  * The value of the variable is a void pointer (initially set to NULL).
594  * Subsequent calls with the same varName just return the address of
595  * the existing variable. Once created, a rendezvous variable lasts
596  * for the life of the process.
597  *
598  * Dynamically loaded libraries can use rendezvous variables
599  * to find each other and share information: they just need to agree
600  * on the variable name and the data it will point to.
601  */
602 void **
603 find_rendezvous_variable(const char *varName)
604 {
605  static HTAB *rendezvousHash = NULL;
606 
607  rendezvousHashEntry *hentry;
608  bool found;
609 
610  /* Create a hashtable if we haven't already done so in this process */
611  if (rendezvousHash == NULL)
612  {
613  HASHCTL ctl;
614 
615  ctl.keysize = NAMEDATALEN;
616  ctl.entrysize = sizeof(rendezvousHashEntry);
617  rendezvousHash = hash_create("Rendezvous variable hash",
618  16,
619  &ctl,
621  }
622 
623  /* Find or create the hashtable entry for this varName */
624  hentry = (rendezvousHashEntry *) hash_search(rendezvousHash,
625  varName,
626  HASH_ENTER,
627  &found);
628 
629  /* Initialize to NULL if first time */
630  if (!found)
631  hentry->varValue = NULL;
632 
633  return &hentry->varValue;
634 }
635 
636 /*
637  * Estimate the amount of space needed to serialize the list of libraries
638  * we have loaded.
639  */
640 Size
642 {
643  DynamicFileList *file_scanner;
644  Size size = 1;
645 
646  for (file_scanner = file_list;
647  file_scanner != NULL;
648  file_scanner = file_scanner->next)
649  size = add_size(size, strlen(file_scanner->filename) + 1);
650 
651  return size;
652 }
653 
654 /*
655  * Serialize the list of libraries we have loaded to a chunk of memory.
656  */
657 void
658 SerializeLibraryState(Size maxsize, char *start_address)
659 {
660  DynamicFileList *file_scanner;
661 
662  for (file_scanner = file_list;
663  file_scanner != NULL;
664  file_scanner = file_scanner->next)
665  {
666  Size len;
667 
668  len = strlcpy(start_address, file_scanner->filename, maxsize) + 1;
669  Assert(len < maxsize);
670  maxsize -= len;
671  start_address += len;
672  }
673  start_address[0] = '\0';
674 }
675 
676 /*
677  * Load every library the serializing backend had loaded.
678  */
679 void
680 RestoreLibraryState(char *start_address)
681 {
682  while (*start_address != '\0')
683  {
684  internal_load_library(start_address);
685  start_address += strlen(start_address) + 1;
686  }
687 }
#define Assert(condition)
Definition: c.h:861
#define pg_attribute_noreturn()
Definition: c.h:232
#define FLEXIBLE_ARRAY_MEMBER
Definition: c.h:413
#define MemSet(start, val, len)
Definition: c.h:1023
size_t Size
Definition: c.h:608
static char * expand_dynamic_library_name(const char *name)
Definition: dfmgr.c:418
static DynamicFileList * file_tail
Definition: dfmgr.c:68
static char * find_in_dynamic_libpath(const char *basename)
Definition: dfmgr.c:519
void RestoreLibraryState(char *start_address)
Definition: dfmgr.c:680
void * load_external_function(const char *filename, const char *funcname, bool signalNotFound, void **filehandle)
Definition: dfmgr.c:105
char * Dynamic_library_path
Definition: dfmgr.c:77
static char * substitute_libpath_macro(const char *name)
Definition: dfmgr.c:488
static void incompatible_module_error(const char *libname, const Pg_magic_struct *module_magic_data) pg_attribute_noreturn()
Definition: dfmgr.c:306
static void * internal_load_library(const char *libname)
Definition: dfmgr.c:184
void SerializeLibraryState(Size maxsize, char *start_address)
Definition: dfmgr.c:658
void load_file(const char *filename, bool restricted)
Definition: dfmgr.c:144
static const Pg_magic_struct magic_data
Definition: dfmgr.c:88
Size EstimateLibraryStateSpace(void)
Definition: dfmgr.c:641
void ** find_rendezvous_variable(const char *varName)
Definition: dfmgr.c:603
static DynamicFileList * file_list
Definition: dfmgr.c:67
void(* PG_init_t)(void)
Definition: dfmgr.c:42
struct df_files DynamicFileList
static void check_restricted_library_name(const char *name)
Definition: dfmgr.c:473
#define SAME_INODE(A, B)
Definition: dfmgr.c:72
void * lookup_external_function(void *filehandle, const char *funcname)
Definition: dfmgr.c:166
void * hash_search(HTAB *hashp, const void *keyPtr, HASHACTION action, bool *foundPtr)
Definition: dynahash.c:955
HTAB * hash_create(const char *tabname, long nelem, const HASHCTL *info, int flags)
Definition: dynahash.c:352
int errdetail_internal(const char *fmt,...)
Definition: elog.c:1230
int errcode_for_file_access(void)
Definition: elog.c:876
int errdetail(const char *fmt,...)
Definition: elog.c:1203
int errhint(const char *fmt,...)
Definition: elog.c:1317
int errcode(int sqlerrcode)
Definition: elog.c:853
int errmsg(const char *fmt,...)
Definition: elog.c:1070
#define _(x)
Definition: elog.c:90
#define DEBUG3
Definition: elog.h:28
#define ERROR
Definition: elog.h:39
#define elog(elevel,...)
Definition: elog.h:225
#define ereport(elevel,...)
Definition: elog.h:149
bool pg_file_exists(const char *name)
Definition: fd.c:502
#define PG_MAGIC_FUNCTION_NAME_STRING
Definition: fmgr.h:496
const Pg_magic_struct *(* PGModuleMagicFunction)(void)
Definition: fmgr.h:493
#define PG_MODULE_MAGIC_DATA
Definition: fmgr.h:475
char pkglib_path[MAXPGPATH]
Definition: globals.c:81
#define free(a)
Definition: header.h:65
#define malloc(a)
Definition: header.h:50
#define HASH_STRINGS
Definition: hsearch.h:96
@ HASH_ENTER
Definition: hsearch.h:114
#define HASH_ELEM
Definition: hsearch.h:95
#define funcname
Definition: indent_codes.h:69
char * pstrdup(const char *in)
Definition: mcxt.c:1696
void pfree(void *pointer)
Definition: mcxt.c:1521
void * palloc(Size size)
Definition: mcxt.c:1317
#define NAMEDATALEN
const void size_t len
static char * filename
Definition: pg_dumpall.c:119
#define is_absolute_path(filename)
Definition: port.h:103
char * first_dir_separator(const char *filename)
Definition: path.c:105
#define sprintf
Definition: port.h:240
void canonicalize_path(char *path)
Definition: path.c:265
char * first_path_var_separator(const char *pathlist)
Definition: path.c:122
#define snprintf
Definition: port.h:238
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
char * psprintf(const char *fmt,...)
Definition: psprintf.c:43
tree ctl
Definition: radixtree.h:1853
Size add_size(Size s1, Size s2)
Definition: shmem.c:493
static pg_noinline void Size size
Definition: slab.c:607
void appendStringInfo(StringInfo str, const char *fmt,...)
Definition: stringinfo.c:94
void appendStringInfoString(StringInfo str, const char *s)
Definition: stringinfo.c:179
void appendStringInfoChar(StringInfo str, char ch)
Definition: stringinfo.c:191
void initStringInfo(StringInfo str)
Definition: stringinfo.c:56
Definition: dynahash.c:220
char abi_extra[32]
Definition: fmgr.h:471
int float8byval
Definition: fmgr.h:470
int funcmaxargs
Definition: fmgr.h:467
int indexmaxkeys
Definition: fmgr.h:468
int namedatalen
Definition: fmgr.h:469
int version
Definition: fmgr.h:466
Definition: dfmgr.c:56
dev_t device
Definition: dfmgr.c:58
ino_t inode
Definition: dfmgr.c:61
void * handle
Definition: dfmgr.c:63
struct df_files * next
Definition: dfmgr.c:57
char filename[FLEXIBLE_ARRAY_MEMBER]
Definition: dfmgr.c:64
void * varValue
Definition: dfmgr.c:48
_dev_t st_dev
Definition: win32_port.h:266
_ino_t st_ino
Definition: win32_port.h:267
const char * name
#define stat
Definition: win32_port.h:284
char * dlerror(void)
Definition: win32dlopen.c:40
void * dlsym(void *handle, const char *symbol)
Definition: win32dlopen.c:61
void * dlopen(const char *file, int mode)
Definition: win32dlopen.c:76
#define RTLD_NOW
Definition: win32_port.h:543
#define RTLD_GLOBAL
Definition: win32_port.h:544
int dlclose(void *handle)
Definition: win32dlopen.c:49