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dfmgr.c File Reference
#include "postgres.h"
#include <sys/stat.h>
#include <dlfcn.h>
#include "fmgr.h"
#include "lib/stringinfo.h"
#include "miscadmin.h"
#include "storage/fd.h"
#include "storage/shmem.h"
#include "utils/hsearch.h"
Include dependency graph for dfmgr.c:

Go to the source code of this file.

Data Structures

struct  rendezvousHashEntry
 
struct  df_files
 

Macros

#define SAME_INODE(A, B)   ((A).st_ino == (B).inode && (A).st_dev == (B).device)
 

Typedefs

typedef void(* PG_init_t) (void)
 
typedef struct df_files DynamicFileList
 

Functions

static void * internal_load_library (const char *libname)
 
static void incompatible_module_error (const char *libname, const Pg_magic_struct *module_magic_data) pg_attribute_noreturn()
 
static char * expand_dynamic_library_name (const char *name)
 
static void check_restricted_library_name (const char *name)
 
static char * substitute_libpath_macro (const char *name)
 
static char * find_in_dynamic_libpath (const char *basename)
 
void * load_external_function (const char *filename, const char *funcname, bool signalNotFound, void **filehandle)
 
void load_file (const char *filename, bool restricted)
 
void * lookup_external_function (void *filehandle, const char *funcname)
 
void ** find_rendezvous_variable (const char *varName)
 
Size EstimateLibraryStateSpace (void)
 
void SerializeLibraryState (Size maxsize, char *start_address)
 
void RestoreLibraryState (char *start_address)
 

Variables

static DynamicFileListfile_list = NULL
 
static DynamicFileListfile_tail = NULL
 
char * Dynamic_library_path
 
static const Pg_magic_struct magic_data = PG_MODULE_MAGIC_DATA
 

Macro Definition Documentation

◆ SAME_INODE

#define SAME_INODE (   A,
 
)    ((A).st_ino == (B).inode && (A).st_dev == (B).device)

Definition at line 72 of file dfmgr.c.

Typedef Documentation

◆ DynamicFileList

typedef struct df_files DynamicFileList

◆ PG_init_t

typedef void(* PG_init_t) (void)

Definition at line 42 of file dfmgr.c.

Function Documentation

◆ check_restricted_library_name()

static void check_restricted_library_name ( const char *  name)
static

Definition at line 473 of file dfmgr.c.

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 }
int errcode(int sqlerrcode)
Definition: elog.c:853
int errmsg(const char *fmt,...)
Definition: elog.c:1070
#define ERROR
Definition: elog.h:39
#define ereport(elevel,...)
Definition: elog.h:149
char * first_dir_separator(const char *filename)
Definition: path.c:105
const char * name

References ereport, errcode(), errmsg(), ERROR, first_dir_separator(), and name.

Referenced by load_file().

◆ EstimateLibraryStateSpace()

Size EstimateLibraryStateSpace ( void  )

Definition at line 641 of file dfmgr.c.

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 }
size_t Size
Definition: c.h:610
static DynamicFileList * file_list
Definition: dfmgr.c:67
Size add_size(Size s1, Size s2)
Definition: shmem.c:493
static pg_noinline void Size size
Definition: slab.c:607
Definition: dfmgr.c:56
struct df_files * next
Definition: dfmgr.c:57
char filename[FLEXIBLE_ARRAY_MEMBER]
Definition: dfmgr.c:64

References add_size(), file_list, df_files::filename, df_files::next, and size.

Referenced by InitializeParallelDSM().

◆ expand_dynamic_library_name()

static char * expand_dynamic_library_name ( const char *  name)
static

Definition at line 418 of file dfmgr.c.

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 }
#define Assert(condition)
Definition: c.h:863
static char * find_in_dynamic_libpath(const char *basename)
Definition: dfmgr.c:519
static char * substitute_libpath_macro(const char *name)
Definition: dfmgr.c:488
bool pg_file_exists(const char *name)
Definition: fd.c:502
char * pstrdup(const char *in)
Definition: mcxt.c:1696
void pfree(void *pointer)
Definition: mcxt.c:1521
char * psprintf(const char *fmt,...)
Definition: psprintf.c:43

References Assert, find_in_dynamic_libpath(), first_dir_separator(), name, pfree(), pg_file_exists(), psprintf(), pstrdup(), and substitute_libpath_macro().

Referenced by load_external_function(), and load_file().

◆ find_in_dynamic_libpath()

static char * find_in_dynamic_libpath ( const char *  basename)
static

Definition at line 519 of file dfmgr.c.

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 }
char * Dynamic_library_path
Definition: dfmgr.c:77
#define DEBUG3
Definition: elog.h:28
#define elog(elevel,...)
Definition: elog.h:225
void * palloc(Size size)
Definition: mcxt.c:1317
const void size_t len
#define is_absolute_path(filename)
Definition: port.h:103
#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
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45

References Assert, canonicalize_path(), DEBUG3, Dynamic_library_path, elog, ereport, errcode(), errmsg(), ERROR, first_dir_separator(), first_path_var_separator(), is_absolute_path, len, palloc(), pfree(), pg_file_exists(), sprintf, strlcpy(), and substitute_libpath_macro().

Referenced by expand_dynamic_library_name().

◆ find_rendezvous_variable()

void** find_rendezvous_variable ( const char *  varName)

Definition at line 603 of file dfmgr.c.

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 }
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
#define HASH_STRINGS
Definition: hsearch.h:96
@ HASH_ENTER
Definition: hsearch.h:114
#define HASH_ELEM
Definition: hsearch.h:95
#define NAMEDATALEN
tree ctl
Definition: radixtree.h:1853
Definition: dynahash.c:220
void * varValue
Definition: dfmgr.c:48

References ctl, hash_create(), HASH_ELEM, HASH_ENTER, hash_search(), HASH_STRINGS, NAMEDATALEN, and rendezvousHashEntry::varValue.

Referenced by _PG_init().

◆ incompatible_module_error()

static void incompatible_module_error ( const char *  libname,
const Pg_magic_struct module_magic_data 
)
static

Definition at line 306 of file dfmgr.c.

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 }
static const Pg_magic_struct magic_data
Definition: dfmgr.c:88
int errdetail_internal(const char *fmt,...)
Definition: elog.c:1230
int errdetail(const char *fmt,...)
Definition: elog.c:1203
#define _(x)
Definition: elog.c:90
#define snprintf
Definition: port.h:238
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
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

References _, Pg_magic_struct::abi_extra, appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), StringInfoData::data, ereport, errdetail(), errdetail_internal(), errmsg(), ERROR, Pg_magic_struct::float8byval, Pg_magic_struct::funcmaxargs, Pg_magic_struct::indexmaxkeys, initStringInfo(), StringInfoData::len, magic_data, Pg_magic_struct::namedatalen, snprintf, and Pg_magic_struct::version.

Referenced by internal_load_library().

◆ internal_load_library()

static void * internal_load_library ( const char *  libname)
static

Definition at line 184 of file dfmgr.c.

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 }
#define MemSet(start, val, len)
Definition: c.h:1025
static DynamicFileList * file_tail
Definition: dfmgr.c:68
static void incompatible_module_error(const char *libname, const Pg_magic_struct *module_magic_data) pg_attribute_noreturn()
Definition: dfmgr.c:306
void(* PG_init_t)(void)
Definition: dfmgr.c:42
#define SAME_INODE(A, B)
Definition: dfmgr.c:72
int errcode_for_file_access(void)
Definition: elog.c:876
int errhint(const char *fmt,...)
Definition: elog.c:1317
#define PG_MAGIC_FUNCTION_NAME_STRING
Definition: fmgr.h:496
const Pg_magic_struct *(* PGModuleMagicFunction)(void)
Definition: fmgr.h:493
#define free(a)
Definition: header.h:65
#define malloc(a)
Definition: header.h:50
static char * filename
Definition: pg_dumpall.c:119
dev_t device
Definition: dfmgr.c:58
ino_t inode
Definition: dfmgr.c:61
void * handle
Definition: dfmgr.c:63
#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

References df_files::device, dlclose(), dlerror(), dlopen(), dlsym(), ereport, errcode(), errcode_for_file_access(), errhint(), errmsg(), ERROR, file_list, file_tail, df_files::filename, filename, free, df_files::handle, incompatible_module_error(), df_files::inode, Pg_magic_struct::len, magic_data, malloc, MemSet, df_files::next, PG_MAGIC_FUNCTION_NAME_STRING, RTLD_GLOBAL, RTLD_NOW, SAME_INODE, stat::st_dev, stat::st_ino, and stat.

Referenced by load_external_function(), load_file(), and RestoreLibraryState().

◆ load_external_function()

void* load_external_function ( const char *  filename,
const char *  funcname,
bool  signalNotFound,
void **  filehandle 
)

Definition at line 105 of file dfmgr.c.

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 }
static char * expand_dynamic_library_name(const char *name)
Definition: dfmgr.c:418
static void * internal_load_library(const char *libname)
Definition: dfmgr.c:184
#define funcname
Definition: indent_codes.h:69

References dlsym(), ereport, errcode(), errmsg(), ERROR, expand_dynamic_library_name(), filename, funcname, internal_load_library(), and pfree().

Referenced by _PG_init(), fmgr_c_validator(), fmgr_info_C_lang(), llvm_resolve_symbol(), LoadArchiveLibrary(), LoadOutputPlugin(), LookupBackgroundWorkerFunction(), LookupParallelWorkerFunction(), and provider_init().

◆ load_file()

void load_file ( const char *  filename,
bool  restricted 
)

Definition at line 144 of file dfmgr.c.

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 }
static void check_restricted_library_name(const char *name)
Definition: dfmgr.c:473

References check_restricted_library_name(), expand_dynamic_library_name(), filename, internal_load_library(), and pfree().

Referenced by AlterSubscription(), AlterSubscription_refresh(), CreateSubscription(), DropSubscription(), load_libraries(), pg_sync_replication_slots(), ReplicationSlotDropAtPubNode(), ReplSlotSyncWorkerMain(), SetupApplyOrSyncWorker(), standard_ProcessUtility(), and WalReceiverMain().

◆ lookup_external_function()

void* lookup_external_function ( void *  filehandle,
const char *  funcname 
)

Definition at line 166 of file dfmgr.c.

167 {
168  return dlsym(filehandle, funcname);
169 }

References dlsym(), and funcname.

Referenced by fetch_finfo_record().

◆ RestoreLibraryState()

void RestoreLibraryState ( char *  start_address)

Definition at line 680 of file dfmgr.c.

681 {
682  while (*start_address != '\0')
683  {
684  internal_load_library(start_address);
685  start_address += strlen(start_address) + 1;
686  }
687 }

References internal_load_library().

Referenced by ParallelWorkerMain().

◆ SerializeLibraryState()

void SerializeLibraryState ( Size  maxsize,
char *  start_address 
)

Definition at line 658 of file dfmgr.c.

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 }

References Assert, file_list, df_files::filename, len, df_files::next, and strlcpy().

Referenced by InitializeParallelDSM().

◆ substitute_libpath_macro()

static char * substitute_libpath_macro ( const char *  name)
static

Definition at line 488 of file dfmgr.c.

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 }
char pkglib_path[MAXPGPATH]
Definition: globals.c:81

References Assert, ereport, errcode(), errmsg(), ERROR, first_dir_separator(), name, pkglib_path, psprintf(), and pstrdup().

Referenced by expand_dynamic_library_name(), and find_in_dynamic_libpath().

Variable Documentation

◆ Dynamic_library_path

char* Dynamic_library_path

Definition at line 77 of file dfmgr.c.

Referenced by find_in_dynamic_libpath().

◆ file_list

DynamicFileList* file_list = NULL
static

Definition at line 67 of file dfmgr.c.

Referenced by EstimateLibraryStateSpace(), internal_load_library(), and SerializeLibraryState().

◆ file_tail

DynamicFileList* file_tail = NULL
static

Definition at line 68 of file dfmgr.c.

Referenced by internal_load_library().

◆ magic_data

const Pg_magic_struct magic_data = PG_MODULE_MAGIC_DATA
static

Definition at line 88 of file dfmgr.c.

Referenced by incompatible_module_error(), and internal_load_library().