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fastpath.c
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1 /*-------------------------------------------------------------------------
2  *
3  * fastpath.c
4  * routines to handle function requests from the frontend
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/tcop/fastpath.c
12  *
13  * NOTES
14  * This cruft is the server side of PQfn.
15  *
16  *-------------------------------------------------------------------------
17  */
18 #include "postgres.h"
19 
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
22 
23 #include "access/htup_details.h"
24 #include "access/xact.h"
25 #include "catalog/objectaccess.h"
26 #include "catalog/pg_proc.h"
27 #include "libpq/libpq.h"
28 #include "libpq/pqformat.h"
29 #include "mb/pg_wchar.h"
30 #include "miscadmin.h"
31 #include "tcop/fastpath.h"
32 #include "tcop/tcopprot.h"
33 #include "utils/acl.h"
34 #include "utils/lsyscache.h"
35 #include "utils/snapmgr.h"
36 #include "utils/syscache.h"
37 
38 
39 /*
40  * Formerly, this code attempted to cache the function and type info
41  * looked up by fetch_fp_info, but only for the duration of a single
42  * transaction command (since in theory the info could change between
43  * commands). This was utterly useless, because postgres.c executes
44  * each fastpath call as a separate transaction command, and so the
45  * cached data could never actually have been reused. If it had worked
46  * as intended, it would have had problems anyway with dangling references
47  * in the FmgrInfo struct. So, forget about caching and just repeat the
48  * syscache fetches on each usage. They're not *that* expensive.
49  */
50 struct fp_info
51 {
53  FmgrInfo flinfo; /* function lookup info for funcid */
54  Oid namespace; /* other stuff from pg_proc */
55  Oid rettype;
57  char fname[NAMEDATALEN]; /* function name for logging */
58 };
59 
60 
61 static int16 parse_fcall_arguments(StringInfo msgBuf, struct fp_info * fip,
62  FunctionCallInfo fcinfo);
63 static int16 parse_fcall_arguments_20(StringInfo msgBuf, struct fp_info * fip,
64  FunctionCallInfo fcinfo);
65 
66 
67 /* ----------------
68  * GetOldFunctionMessage
69  *
70  * In pre-3.0 protocol, there is no length word on the message, so we have
71  * to have code that understands the message layout to absorb the message
72  * into a buffer. We want to do this before we start execution, so that
73  * we do not lose sync with the frontend if there's an error.
74  *
75  * The caller should already have initialized buf to empty.
76  * ----------------
77  */
78 int
80 {
81  int32 ibuf;
82  int nargs;
83 
84  /* Dummy string argument */
85  if (pq_getstring(buf))
86  return EOF;
87  /* Function OID */
88  if (pq_getbytes((char *) &ibuf, 4))
89  return EOF;
90  appendBinaryStringInfo(buf, (char *) &ibuf, 4);
91  /* Number of arguments */
92  if (pq_getbytes((char *) &ibuf, 4))
93  return EOF;
94  appendBinaryStringInfo(buf, (char *) &ibuf, 4);
95  nargs = ntohl(ibuf);
96  /* For each argument ... */
97  while (nargs-- > 0)
98  {
99  int argsize;
100 
101  /* argsize */
102  if (pq_getbytes((char *) &ibuf, 4))
103  return EOF;
104  appendBinaryStringInfo(buf, (char *) &ibuf, 4);
105  argsize = ntohl(ibuf);
106  if (argsize < -1)
107  {
108  /* FATAL here since no hope of regaining message sync */
109  ereport(FATAL,
110  (errcode(ERRCODE_PROTOCOL_VIOLATION),
111  errmsg("invalid argument size %d in function call message",
112  argsize)));
113  }
114  /* and arg contents */
115  if (argsize > 0)
116  {
117  /* Allocate space for arg */
118  enlargeStringInfo(buf, argsize);
119  /* And grab it */
120  if (pq_getbytes(buf->data + buf->len, argsize))
121  return EOF;
122  buf->len += argsize;
123  /* Place a trailing null per StringInfo convention */
124  buf->data[buf->len] = '\0';
125  }
126  }
127  return 0;
128 }
129 
130 /* ----------------
131  * SendFunctionResult
132  *
133  * Note: although this routine doesn't check, the format had better be 1
134  * (binary) when talking to a pre-3.0 client.
135  * ----------------
136  */
137 static void
138 SendFunctionResult(Datum retval, bool isnull, Oid rettype, int16 format)
139 {
140  bool newstyle = (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 3);
142 
143  pq_beginmessage(&buf, 'V');
144 
145  if (isnull)
146  {
147  if (newstyle)
148  pq_sendint(&buf, -1, 4);
149  }
150  else
151  {
152  if (!newstyle)
153  pq_sendbyte(&buf, 'G');
154 
155  if (format == 0)
156  {
157  Oid typoutput;
158  bool typisvarlena;
159  char *outputstr;
160 
161  getTypeOutputInfo(rettype, &typoutput, &typisvarlena);
162  outputstr = OidOutputFunctionCall(typoutput, retval);
163  pq_sendcountedtext(&buf, outputstr, strlen(outputstr), false);
164  pfree(outputstr);
165  }
166  else if (format == 1)
167  {
168  Oid typsend;
169  bool typisvarlena;
170  bytea *outputbytes;
171 
172  getTypeBinaryOutputInfo(rettype, &typsend, &typisvarlena);
173  outputbytes = OidSendFunctionCall(typsend, retval);
174  pq_sendint(&buf, VARSIZE(outputbytes) - VARHDRSZ, 4);
175  pq_sendbytes(&buf, VARDATA(outputbytes),
176  VARSIZE(outputbytes) - VARHDRSZ);
177  pfree(outputbytes);
178  }
179  else
180  ereport(ERROR,
181  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
182  errmsg("unsupported format code: %d", format)));
183  }
184 
185  if (!newstyle)
186  pq_sendbyte(&buf, '0');
187 
188  pq_endmessage(&buf);
189 }
190 
191 /*
192  * fetch_fp_info
193  *
194  * Performs catalog lookups to load a struct fp_info 'fip' for the
195  * function 'func_id'.
196  */
197 static void
198 fetch_fp_info(Oid func_id, struct fp_info * fip)
199 {
200  HeapTuple func_htp;
201  Form_pg_proc pp;
202 
203  Assert(OidIsValid(func_id));
204  Assert(fip != NULL);
205 
206  /*
207  * Since the validity of this structure is determined by whether the
208  * funcid is OK, we clear the funcid here. It must not be set to the
209  * correct value until we are about to return with a good struct fp_info,
210  * since we can be interrupted (i.e., with an ereport(ERROR, ...)) at any
211  * time. [No longer really an issue since we don't save the struct
212  * fp_info across transactions anymore, but keep it anyway.]
213  */
214  MemSet(fip, 0, sizeof(struct fp_info));
215  fip->funcid = InvalidOid;
216 
217  fmgr_info(func_id, &fip->flinfo);
218 
219  func_htp = SearchSysCache1(PROCOID, ObjectIdGetDatum(func_id));
220  if (!HeapTupleIsValid(func_htp))
221  ereport(ERROR,
222  (errcode(ERRCODE_UNDEFINED_FUNCTION),
223  errmsg("function with OID %u does not exist", func_id)));
224  pp = (Form_pg_proc) GETSTRUCT(func_htp);
225 
226  /* watch out for catalog entries with more than FUNC_MAX_ARGS args */
227  if (pp->pronargs > FUNC_MAX_ARGS)
228  elog(ERROR, "function %s has more than %d arguments",
229  NameStr(pp->proname), FUNC_MAX_ARGS);
230 
231  fip->namespace = pp->pronamespace;
232  fip->rettype = pp->prorettype;
233  memcpy(fip->argtypes, pp->proargtypes.values, pp->pronargs * sizeof(Oid));
234  strlcpy(fip->fname, NameStr(pp->proname), NAMEDATALEN);
235 
236  ReleaseSysCache(func_htp);
237 
238  /*
239  * This must be last!
240  */
241  fip->funcid = func_id;
242 }
243 
244 
245 /*
246  * HandleFunctionRequest
247  *
248  * Server side of PQfn (fastpath function calls from the frontend).
249  * This corresponds to the libpq protocol symbol "F".
250  *
251  * INPUT:
252  * postgres.c has already read the message body and will pass it in
253  * msgBuf.
254  *
255  * Note: palloc()s done here and in the called function do not need to be
256  * cleaned up explicitly. We are called from PostgresMain() in the
257  * MessageContext memory context, which will be automatically reset when
258  * control returns to PostgresMain.
259  */
260 void
262 {
263  Oid fid;
264  AclResult aclresult;
265  FunctionCallInfoData fcinfo;
266  int16 rformat;
267  Datum retval;
268  struct fp_info my_fp;
269  struct fp_info *fip;
270  bool callit;
271  bool was_logged = false;
272  char msec_str[32];
273 
274  /*
275  * We only accept COMMIT/ABORT if we are in an aborted transaction, and
276  * COMMIT/ABORT cannot be executed through the fastpath interface.
277  */
279  ereport(ERROR,
280  (errcode(ERRCODE_IN_FAILED_SQL_TRANSACTION),
281  errmsg("current transaction is aborted, "
282  "commands ignored until end of transaction block")));
283 
284  /*
285  * Now that we know we are in a valid transaction, set snapshot in case
286  * needed by function itself or one of the datatype I/O routines.
287  */
289 
290  /*
291  * Begin parsing the buffer contents.
292  */
294  (void) pq_getmsgstring(msgBuf); /* dummy string */
295 
296  fid = (Oid) pq_getmsgint(msgBuf, 4); /* function oid */
297 
298  /*
299  * There used to be a lame attempt at caching lookup info here. Now we
300  * just do the lookups on every call.
301  */
302  fip = &my_fp;
303  fetch_fp_info(fid, fip);
304 
305  /* Log as soon as we have the function OID and name */
306  if (log_statement == LOGSTMT_ALL)
307  {
308  ereport(LOG,
309  (errmsg("fastpath function call: \"%s\" (OID %u)",
310  fip->fname, fid)));
311  was_logged = true;
312  }
313 
314  /*
315  * Check permission to access and call function. Since we didn't go
316  * through a normal name lookup, we need to check schema usage too.
317  */
318  aclresult = pg_namespace_aclcheck(fip->namespace, GetUserId(), ACL_USAGE);
319  if (aclresult != ACLCHECK_OK)
321  get_namespace_name(fip->namespace));
322  InvokeNamespaceSearchHook(fip->namespace, true);
323 
324  aclresult = pg_proc_aclcheck(fid, GetUserId(), ACL_EXECUTE);
325  if (aclresult != ACLCHECK_OK)
326  aclcheck_error(aclresult, ACL_KIND_PROC,
327  get_func_name(fid));
329 
330  /*
331  * Prepare function call info block and insert arguments.
332  *
333  * Note: for now we pass collation = InvalidOid, so collation-sensitive
334  * functions can't be called this way. Perhaps we should pass
335  * DEFAULT_COLLATION_OID, instead?
336  */
337  InitFunctionCallInfoData(fcinfo, &fip->flinfo, 0, InvalidOid, NULL, NULL);
338 
340  rformat = parse_fcall_arguments(msgBuf, fip, &fcinfo);
341  else
342  rformat = parse_fcall_arguments_20(msgBuf, fip, &fcinfo);
343 
344  /* Verify we reached the end of the message where expected. */
345  pq_getmsgend(msgBuf);
346 
347  /*
348  * If func is strict, must not call it for null args.
349  */
350  callit = true;
351  if (fip->flinfo.fn_strict)
352  {
353  int i;
354 
355  for (i = 0; i < fcinfo.nargs; i++)
356  {
357  if (fcinfo.argnull[i])
358  {
359  callit = false;
360  break;
361  }
362  }
363  }
364 
365  if (callit)
366  {
367  /* Okay, do it ... */
368  retval = FunctionCallInvoke(&fcinfo);
369  }
370  else
371  {
372  fcinfo.isnull = true;
373  retval = (Datum) 0;
374  }
375 
376  /* ensure we do at least one CHECK_FOR_INTERRUPTS per function call */
378 
379  SendFunctionResult(retval, fcinfo.isnull, fip->rettype, rformat);
380 
381  /* We no longer need the snapshot */
383 
384  /*
385  * Emit duration logging if appropriate.
386  */
387  switch (check_log_duration(msec_str, was_logged))
388  {
389  case 1:
390  ereport(LOG,
391  (errmsg("duration: %s ms", msec_str)));
392  break;
393  case 2:
394  ereport(LOG,
395  (errmsg("duration: %s ms fastpath function call: \"%s\" (OID %u)",
396  msec_str, fip->fname, fid)));
397  break;
398  }
399 }
400 
401 /*
402  * Parse function arguments in a 3.0 protocol message
403  *
404  * Argument values are loaded into *fcinfo, and the desired result format
405  * is returned.
406  */
407 static int16
409  FunctionCallInfo fcinfo)
410 {
411  int nargs;
412  int i;
413  int numAFormats;
414  int16 *aformats = NULL;
415  StringInfoData abuf;
416 
417  /* Get the argument format codes */
418  numAFormats = pq_getmsgint(msgBuf, 2);
419  if (numAFormats > 0)
420  {
421  aformats = (int16 *) palloc(numAFormats * sizeof(int16));
422  for (i = 0; i < numAFormats; i++)
423  aformats[i] = pq_getmsgint(msgBuf, 2);
424  }
425 
426  nargs = pq_getmsgint(msgBuf, 2); /* # of arguments */
427 
428  if (fip->flinfo.fn_nargs != nargs || nargs > FUNC_MAX_ARGS)
429  ereport(ERROR,
430  (errcode(ERRCODE_PROTOCOL_VIOLATION),
431  errmsg("function call message contains %d arguments but function requires %d",
432  nargs, fip->flinfo.fn_nargs)));
433 
434  fcinfo->nargs = nargs;
435 
436  if (numAFormats > 1 && numAFormats != nargs)
437  ereport(ERROR,
438  (errcode(ERRCODE_PROTOCOL_VIOLATION),
439  errmsg("function call message contains %d argument formats but %d arguments",
440  numAFormats, nargs)));
441 
442  initStringInfo(&abuf);
443 
444  /*
445  * Copy supplied arguments into arg vector.
446  */
447  for (i = 0; i < nargs; ++i)
448  {
449  int argsize;
450  int16 aformat;
451 
452  argsize = pq_getmsgint(msgBuf, 4);
453  if (argsize == -1)
454  {
455  fcinfo->argnull[i] = true;
456  }
457  else
458  {
459  fcinfo->argnull[i] = false;
460  if (argsize < 0)
461  ereport(ERROR,
462  (errcode(ERRCODE_PROTOCOL_VIOLATION),
463  errmsg("invalid argument size %d in function call message",
464  argsize)));
465 
466  /* Reset abuf to empty, and insert raw data into it */
467  resetStringInfo(&abuf);
469  pq_getmsgbytes(msgBuf, argsize),
470  argsize);
471  }
472 
473  if (numAFormats > 1)
474  aformat = aformats[i];
475  else if (numAFormats > 0)
476  aformat = aformats[0];
477  else
478  aformat = 0; /* default = text */
479 
480  if (aformat == 0)
481  {
482  Oid typinput;
483  Oid typioparam;
484  char *pstring;
485 
486  getTypeInputInfo(fip->argtypes[i], &typinput, &typioparam);
487 
488  /*
489  * Since stringinfo.c keeps a trailing null in place even for
490  * binary data, the contents of abuf are a valid C string. We
491  * have to do encoding conversion before calling the typinput
492  * routine, though.
493  */
494  if (argsize == -1)
495  pstring = NULL;
496  else
497  pstring = pg_client_to_server(abuf.data, argsize);
498 
499  fcinfo->arg[i] = OidInputFunctionCall(typinput, pstring,
500  typioparam, -1);
501  /* Free result of encoding conversion, if any */
502  if (pstring && pstring != abuf.data)
503  pfree(pstring);
504  }
505  else if (aformat == 1)
506  {
507  Oid typreceive;
508  Oid typioparam;
509  StringInfo bufptr;
510 
511  /* Call the argument type's binary input converter */
512  getTypeBinaryInputInfo(fip->argtypes[i], &typreceive, &typioparam);
513 
514  if (argsize == -1)
515  bufptr = NULL;
516  else
517  bufptr = &abuf;
518 
519  fcinfo->arg[i] = OidReceiveFunctionCall(typreceive, bufptr,
520  typioparam, -1);
521 
522  /* Trouble if it didn't eat the whole buffer */
523  if (argsize != -1 && abuf.cursor != abuf.len)
524  ereport(ERROR,
525  (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
526  errmsg("incorrect binary data format in function argument %d",
527  i + 1)));
528  }
529  else
530  ereport(ERROR,
531  (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
532  errmsg("unsupported format code: %d", aformat)));
533  }
534 
535  /* Return result format code */
536  return (int16) pq_getmsgint(msgBuf, 2);
537 }
538 
539 /*
540  * Parse function arguments in a 2.0 protocol message
541  *
542  * Argument values are loaded into *fcinfo, and the desired result format
543  * is returned.
544  */
545 static int16
547  FunctionCallInfo fcinfo)
548 {
549  int nargs;
550  int i;
551  StringInfoData abuf;
552 
553  nargs = pq_getmsgint(msgBuf, 4); /* # of arguments */
554 
555  if (fip->flinfo.fn_nargs != nargs || nargs > FUNC_MAX_ARGS)
556  ereport(ERROR,
557  (errcode(ERRCODE_PROTOCOL_VIOLATION),
558  errmsg("function call message contains %d arguments but function requires %d",
559  nargs, fip->flinfo.fn_nargs)));
560 
561  fcinfo->nargs = nargs;
562 
563  initStringInfo(&abuf);
564 
565  /*
566  * Copy supplied arguments into arg vector. In protocol 2.0 these are
567  * always assumed to be supplied in binary format.
568  *
569  * Note: although the original protocol 2.0 code did not have any way for
570  * the frontend to specify a NULL argument, we now choose to interpret
571  * length == -1 as meaning a NULL.
572  */
573  for (i = 0; i < nargs; ++i)
574  {
575  int argsize;
576  Oid typreceive;
577  Oid typioparam;
578 
579  getTypeBinaryInputInfo(fip->argtypes[i], &typreceive, &typioparam);
580 
581  argsize = pq_getmsgint(msgBuf, 4);
582  if (argsize == -1)
583  {
584  fcinfo->argnull[i] = true;
585  fcinfo->arg[i] = OidReceiveFunctionCall(typreceive, NULL,
586  typioparam, -1);
587  continue;
588  }
589  fcinfo->argnull[i] = false;
590  if (argsize < 0)
591  ereport(ERROR,
592  (errcode(ERRCODE_PROTOCOL_VIOLATION),
593  errmsg("invalid argument size %d in function call message",
594  argsize)));
595 
596  /* Reset abuf to empty, and insert raw data into it */
597  resetStringInfo(&abuf);
599  pq_getmsgbytes(msgBuf, argsize),
600  argsize);
601 
602  fcinfo->arg[i] = OidReceiveFunctionCall(typreceive, &abuf,
603  typioparam, -1);
604 
605  /* Trouble if it didn't eat the whole buffer */
606  if (abuf.cursor != abuf.len)
607  ereport(ERROR,
608  (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
609  errmsg("incorrect binary data format in function argument %d",
610  i + 1)));
611  }
612 
613  /* Desired result format is always binary in protocol 2.0 */
614  return 1;
615 }
signed short int16
Definition: c.h:255
Definition: fmgr.h:56
FmgrInfo flinfo
Definition: fastpath.c:53
short fn_nargs
Definition: fmgr.h:60
void getTypeOutputInfo(Oid type, Oid *typOutput, bool *typIsVarlena)
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Definition: postgres.h:303
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Definition: fastpath.c:57
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static void SendFunctionResult(Datum retval, bool isnull, Oid rettype, int16 format)
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Definition: syscache.h:152
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signed int int32
Definition: c.h:256
static int16 parse_fcall_arguments_20(StringInfo msgBuf, struct fp_info *fip, FunctionCallInfo fcinfo)
Definition: fastpath.c:546
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Definition: objectaccess.h:174
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Definition: mbutils.c:556
#define ObjectIdGetDatum(X)
Definition: postgres.h:513
#define ERROR
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bool fn_strict
Definition: fmgr.h:61
char * get_func_name(Oid funcid)
Definition: lsyscache.c:1412
#define FATAL
Definition: elog.h:52
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Definition: fmgr.c:127
Datum OidReceiveFunctionCall(Oid functionId, StringInfo buf, Oid typioparam, int32 typmod)
Definition: fmgr.c:1756
bytea * OidSendFunctionCall(Oid functionId, Datum val)
Definition: fmgr.c:1766
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Definition: lsyscache.c:3038
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Definition: snapmgr.c:728
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Definition: stringinfo.c:94
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Definition: fmgr.h:86
void getTypeBinaryInputInfo(Oid type, Oid *typReceive, Oid *typIOParam)
Definition: lsyscache.c:2665
void getTypeInputInfo(Oid type, Oid *typInput, Oid *typIOParam)
Definition: lsyscache.c:2599
#define ereport(elevel, rest)
Definition: elog.h:122
#define InvokeFunctionExecuteHook(objectId)
Definition: objectaccess.h:179
Oid argtypes[FUNC_MAX_ARGS]
Definition: fastpath.c:56
void initStringInfo(StringInfo str)
Definition: stringinfo.c:65
void getTypeBinaryOutputInfo(Oid type, Oid *typSend, bool *typIsVarlena)
Definition: lsyscache.c:2698
AclResult
Definition: acl.h:170
uintptr_t Datum
Definition: postgres.h:372
void ReleaseSysCache(HeapTuple tuple)
Definition: syscache.c:1116
static int16 parse_fcall_arguments(StringInfo msgBuf, struct fp_info *fip, FunctionCallInfo fcinfo)
Definition: fastpath.c:408
FormData_pg_proc * Form_pg_proc
Definition: pg_proc.h:83
#define InvalidOid
Definition: postgres_ext.h:36
Datum arg[FUNC_MAX_ARGS]
Definition: fmgr.h:85
size_t strlcpy(char *dst, const char *src, size_t siz)
Definition: strlcpy.c:45
#define HeapTupleIsValid(tuple)
Definition: htup.h:77
#define NULL
Definition: c.h:229
#define Assert(condition)
Definition: c.h:675
void HandleFunctionRequest(StringInfo msgBuf)
Definition: fastpath.c:261
#define InitFunctionCallInfoData(Fcinfo, Flinfo, Nargs, Collation, Context, Resultinfo)
Definition: fmgr.h:120
int log_statement
Definition: postgres.c:91
static void fetch_fp_info(Oid func_id, struct fp_info *fip)
Definition: fastpath.c:198
void pq_sendbytes(StringInfo buf, const char *data, int datalen)
Definition: pqformat.c:115
char * OidOutputFunctionCall(Oid functionId, Datum val)
Definition: fmgr.c:1747
void * palloc(Size size)
Definition: mcxt.c:849
int errmsg(const char *fmt,...)
Definition: elog.c:797
void pq_sendint(StringInfo buf, int i, int b)
Definition: pqformat.c:236
void pq_endmessage(StringInfo buf)
Definition: pqformat.c:344
#define ACL_EXECUTE
Definition: parsenodes.h:79
AclResult pg_proc_aclcheck(Oid proc_oid, Oid roleid, AclMode mode)
Definition: aclchk.c:4446
int i
#define NameStr(name)
Definition: c.h:499
int pq_getstring(StringInfo s)
Definition: pqcomm.c:1147
Definition: c.h:439
Oid funcid
Definition: fastpath.c:52
unsigned int pq_getmsgint(StringInfo msg, int b)
Definition: pqformat.c:448
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:97
static char format
Definition: pg_basebackup.c:80
#define elog
Definition: elog.h:219
void pq_getmsgend(StringInfo msg)
Definition: pqformat.c:677
Datum OidInputFunctionCall(Oid functionId, char *str, Oid typioparam, int32 typmod)
Definition: fmgr.c:1738
ProtocolVersion FrontendProtocol
Definition: globals.c:27
void appendBinaryStringInfo(StringInfo str, const char *data, int datalen)
Definition: stringinfo.c:240