reentr.c

   1 /*
   2  *    reentr.c
   3  *
   4  *    Copyright (c) 1997-2003, Larry Wall
   5  *
   6  *    You may distribute under the terms of either the GNU General Public
   7  *    License or the Artistic License, as specified in the README file.
   8  *
   9  *  !!!!!!!   DO NOT EDIT THIS FILE   !!!!!!!
  10  *  This file is built by reentrl.pl from data in reentr.pl.
  11  *
  12  * "Saruman," I said, standing away from him, "only one hand at a time can
  13  *  wield the One, and you know that well, so do not trouble to say we!"
  14  *
  15  */
  16
  17 #include "EXTERN.h"
  18 #define PERL_IN_REENTR_C
  19 #include "perl.h"
  20 #include "reentr.h"
  21
  22 void
  23 Perl_reentrant_size(pTHX) {
  24 #ifdef USE_REENTRANT_API
  25 #define REENTRANTSMALLSIZE       256    /* Make something up. */
  26 #define REENTRANTUSUALSIZE      4096    /* Make something up. */
  27 #ifdef HAS_ASCTIME_R
  28         PL_reentrant_buffer->_asctime_size = REENTRANTSMALLSIZE;
  29 #endif /* HAS_ASCTIME_R */
  30 #ifdef HAS_CRYPT_R
  31 #endif /* HAS_CRYPT_R */
  32 #ifdef HAS_CTIME_R
  33         PL_reentrant_buffer->_ctime_size = REENTRANTSMALLSIZE;
  34 #endif /* HAS_CTIME_R */
  35 #ifdef HAS_DRAND48_R
  36 #endif /* HAS_DRAND48_R */
  37 #ifdef HAS_GETGRNAM_R
  38 #   if defined(HAS_SYSCONF) && defined(_SC_GETGR_R_SIZE_MAX) && !defined(__GLIBC__)
  39         PL_reentrant_buffer->_grent_size = sysconf(_SC_GETGR_R_SIZE_MAX);
  40         if (PL_reentrant_buffer->_grent_size == -1)
  41                 PL_reentrant_buffer->_grent_size = REENTRANTUSUALSIZE;
  42 #   else
  43 #       if defined(__osf__) && defined(__alpha) && defined(SIABUFSIZ)
  44         PL_reentrant_buffer->_grent_size = SIABUFSIZ;
  45 #       else
  46 #           ifdef __sgi
  47         PL_reentrant_buffer->_grent_size = BUFSIZ;
  48 #           else
  49         PL_reentrant_buffer->_grent_size = REENTRANTUSUALSIZE;
  50 #           endif
  51 #       endif
  52 #   endif
  53 #endif /* HAS_GETGRNAM_R */
  54 #ifdef HAS_GETHOSTBYNAME_R
  55 #if   !(GETHOSTBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
  56         PL_reentrant_buffer->_hostent_size = REENTRANTUSUALSIZE;
  57 #endif
  58 #endif /* HAS_GETHOSTBYNAME_R */
  59 #ifdef HAS_GETLOGIN_R
  60         PL_reentrant_buffer->_getlogin_size = REENTRANTSMALLSIZE;
  61 #endif /* HAS_GETLOGIN_R */
  62 #ifdef HAS_GETNETBYNAME_R
  63 #if   !(GETNETBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
  64         PL_reentrant_buffer->_netent_size = REENTRANTUSUALSIZE;
  65 #endif
  66 #endif /* HAS_GETNETBYNAME_R */
  67 #ifdef HAS_GETPROTOBYNAME_R
  68 #if   !(GETPROTOBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
  69         PL_reentrant_buffer->_protoent_size = REENTRANTUSUALSIZE;
  70 #endif
  71 #endif /* HAS_GETPROTOBYNAME_R */
  72 #ifdef HAS_GETPWNAM_R
  73 #   if defined(HAS_SYSCONF) && defined(_SC_GETPW_R_SIZE_MAX) && !defined(__GLIBC__)
  74         PL_reentrant_buffer->_pwent_size = sysconf(_SC_GETPW_R_SIZE_MAX);
  75         if (PL_reentrant_buffer->_pwent_size == -1)
  76                 PL_reentrant_buffer->_pwent_size = REENTRANTUSUALSIZE;
  77 #   else
  78 #       if defined(__osf__) && defined(__alpha) && defined(SIABUFSIZ)
  79         PL_reentrant_buffer->_pwent_size = SIABUFSIZ;
  80 #       else
  81 #           ifdef __sgi
  82         PL_reentrant_buffer->_pwent_size = BUFSIZ;
  83 #           else
  84         PL_reentrant_buffer->_pwent_size = REENTRANTUSUALSIZE;
  85 #           endif
  86 #       endif
  87 #   endif
  88 #endif /* HAS_GETPWNAM_R */
  89 #ifdef HAS_GETSERVBYNAME_R
  90 #if   !(GETSERVBYNAME_R_PROTO == REENTRANT_PROTO_I_CCSD)
  91         PL_reentrant_buffer->_servent_size = REENTRANTUSUALSIZE;
  92 #endif
  93 #endif /* HAS_GETSERVBYNAME_R */
  94 #ifdef HAS_GETSPNAM_R
  95 #   if defined(HAS_SYSCONF) && defined(_SC_GETPW_R_SIZE_MAX) && !defined(__GLIBC__)
  96         PL_reentrant_buffer->_spent_size = sysconf(_SC_GETPW_R_SIZE_MAX);
  97         if (PL_reentrant_buffer->_spent_size == -1)
  98                 PL_reentrant_buffer->_spent_size = REENTRANTUSUALSIZE;
  99 #   else
 100 #       if defined(__osf__) && defined(__alpha) && defined(SIABUFSIZ)
 101         PL_reentrant_buffer->_spent_size = SIABUFSIZ;
 102 #       else
 103 #           ifdef __sgi
 104         PL_reentrant_buffer->_spent_size = BUFSIZ;
 105 #           else
 106         PL_reentrant_buffer->_spent_size = REENTRANTUSUALSIZE;
 107 #           endif
 108 #       endif
 109 #   endif
 110 #endif /* HAS_GETSPNAM_R */
 111 #ifdef HAS_GMTIME_R
 112 #endif /* HAS_GMTIME_R */
 113 #ifdef HAS_LOCALTIME_R
 114 #endif /* HAS_LOCALTIME_R */
 115 #ifdef HAS_RANDOM_R
 116 #endif /* HAS_RANDOM_R */
 117 #ifdef HAS_READDIR_R
 118         /* This is the size Solaris recommends.
 119          * (though we go static, should use pathconf() instead) */
 120         PL_reentrant_buffer->_readdir_size = sizeof(struct dirent) + MAXPATHLEN + 1;
 121 #endif /* HAS_READDIR_R */
 122 #ifdef HAS_READDIR64_R
 123         /* This is the size Solaris recommends.
 124          * (though we go static, should use pathconf() instead) */
 125         PL_reentrant_buffer->_readdir64_size = sizeof(struct dirent64) + MAXPATHLEN + 1;
 126 #endif /* HAS_READDIR64_R */
 127 #ifdef HAS_SETLOCALE_R
 128         PL_reentrant_buffer->_setlocale_size = REENTRANTSMALLSIZE;
 129 #endif /* HAS_SETLOCALE_R */
 130 #ifdef HAS_STRERROR_R
 131         PL_reentrant_buffer->_strerror_size = REENTRANTSMALLSIZE;
 132 #endif /* HAS_STRERROR_R */
 133 #ifdef HAS_TTYNAME_R
 134         PL_reentrant_buffer->_ttyname_size = REENTRANTSMALLSIZE;
 135 #endif /* HAS_TTYNAME_R */
 136
 137 #endif /* USE_REENTRANT_API */
 138 }
 139
 140 void
 141 Perl_reentrant_init(pTHX) {
 142 #ifdef USE_REENTRANT_API
 143         New(31337, PL_reentrant_buffer, 1, REENTR);
 144         Perl_reentrant_size(aTHX);
 145 #ifdef HAS_ASCTIME_R
 146         New(31338, PL_reentrant_buffer->_asctime_buffer, PL_reentrant_buffer->_asctime_size, char);
 147 #endif /* HAS_ASCTIME_R */
 148 #ifdef HAS_CRYPT_R
 149 #ifdef __GLIBC__
 150         PL_reentrant_buffer->_crypt_struct.initialized = 0;
 151         /* work around glibc-2.2.5 bug */
 152         PL_reentrant_buffer->_crypt_struct.current_saltbits = 0;
 153 #endif
 154 #endif /* HAS_CRYPT_R */
 155 #ifdef HAS_CTIME_R
 156         New(31338, PL_reentrant_buffer->_ctime_buffer, PL_reentrant_buffer->_ctime_size, char);
 157 #endif /* HAS_CTIME_R */
 158 #ifdef HAS_DRAND48_R
 159 #endif /* HAS_DRAND48_R */
 160 #ifdef HAS_GETGRNAM_R
 161 #   ifdef USE_GRENT_FPTR
 162         PL_reentrant_buffer->_grent_fptr = NULL;
 163 #   endif
 164         New(31338, PL_reentrant_buffer->_grent_buffer, PL_reentrant_buffer->_grent_size, char);
 165 #endif /* HAS_GETGRNAM_R */
 166 #ifdef HAS_GETHOSTBYNAME_R
 167 #if   !(GETHOSTBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
 168         New(31338, PL_reentrant_buffer->_hostent_buffer, PL_reentrant_buffer->_hostent_size, char);
 169 #endif
 170 #endif /* HAS_GETHOSTBYNAME_R */
 171 #ifdef HAS_GETLOGIN_R
 172         New(31338, PL_reentrant_buffer->_getlogin_buffer, PL_reentrant_buffer->_getlogin_size, char);
 173 #endif /* HAS_GETLOGIN_R */
 174 #ifdef HAS_GETNETBYNAME_R
 175 #if   !(GETNETBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
 176         New(31338, PL_reentrant_buffer->_netent_buffer, PL_reentrant_buffer->_netent_size, char);
 177 #endif
 178 #endif /* HAS_GETNETBYNAME_R */
 179 #ifdef HAS_GETPROTOBYNAME_R
 180 #if   !(GETPROTOBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
 181         New(31338, PL_reentrant_buffer->_protoent_buffer, PL_reentrant_buffer->_protoent_size, char);
 182 #endif
 183 #endif /* HAS_GETPROTOBYNAME_R */
 184 #ifdef HAS_GETPWNAM_R
 185 #   ifdef USE_PWENT_FPTR
 186         PL_reentrant_buffer->_pwent_fptr = NULL;
 187 #   endif
 188         New(31338, PL_reentrant_buffer->_pwent_buffer, PL_reentrant_buffer->_pwent_size, char);
 189 #endif /* HAS_GETPWNAM_R */
 190 #ifdef HAS_GETSERVBYNAME_R
 191 #if   !(GETSERVBYNAME_R_PROTO == REENTRANT_PROTO_I_CCSD)
 192         New(31338, PL_reentrant_buffer->_servent_buffer, PL_reentrant_buffer->_servent_size, char);
 193 #endif
 194 #endif /* HAS_GETSERVBYNAME_R */
 195 #ifdef HAS_GETSPNAM_R
 196 #   ifdef USE_SPENT_FPTR
 197         PL_reentrant_buffer->_spent_fptr = NULL;
 198 #   endif
 199         New(31338, PL_reentrant_buffer->_spent_buffer, PL_reentrant_buffer->_spent_size, char);
 200 #endif /* HAS_GETSPNAM_R */
 201 #ifdef HAS_GMTIME_R
 202 #endif /* HAS_GMTIME_R */
 203 #ifdef HAS_LOCALTIME_R
 204 #endif /* HAS_LOCALTIME_R */
 205 #ifdef HAS_RANDOM_R
 206 #endif /* HAS_RANDOM_R */
 207 #ifdef HAS_READDIR_R
 208         PL_reentrant_buffer->_readdir_struct = (struct dirent*)safemalloc(PL_reentrant_buffer->_readdir_size);
 209 #endif /* HAS_READDIR_R */
 210 #ifdef HAS_READDIR64_R
 211         PL_reentrant_buffer->_readdir64_struct = (struct dirent64*)safemalloc(PL_reentrant_buffer->_readdir64_size);
 212 #endif /* HAS_READDIR64_R */
 213 #ifdef HAS_SETLOCALE_R
 214         New(31338, PL_reentrant_buffer->_setlocale_buffer, PL_reentrant_buffer->_setlocale_size, char);
 215 #endif /* HAS_SETLOCALE_R */
 216 #ifdef HAS_STRERROR_R
 217         New(31338, PL_reentrant_buffer->_strerror_buffer, PL_reentrant_buffer->_strerror_size, char);
 218 #endif /* HAS_STRERROR_R */
 219 #ifdef HAS_TTYNAME_R
 220         New(31338, PL_reentrant_buffer->_ttyname_buffer, PL_reentrant_buffer->_ttyname_size, char);
 221 #endif /* HAS_TTYNAME_R */
 222
 223 #endif /* USE_REENTRANT_API */
 224 }
 225
 226 void
 227 Perl_reentrant_free(pTHX) {
 228 #ifdef USE_REENTRANT_API
 229 #ifdef HAS_ASCTIME_R
 230         Safefree(PL_reentrant_buffer->_asctime_buffer);
 231 #endif /* HAS_ASCTIME_R */
 232 #ifdef HAS_CRYPT_R
 233 #endif /* HAS_CRYPT_R */
 234 #ifdef HAS_CTIME_R
 235         Safefree(PL_reentrant_buffer->_ctime_buffer);
 236 #endif /* HAS_CTIME_R */
 237 #ifdef HAS_DRAND48_R
 238 #endif /* HAS_DRAND48_R */
 239 #ifdef HAS_GETGRNAM_R
 240         Safefree(PL_reentrant_buffer->_grent_buffer);
 241 #endif /* HAS_GETGRNAM_R */
 242 #ifdef HAS_GETHOSTBYNAME_R
 243 #if   !(GETHOSTBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
 244         Safefree(PL_reentrant_buffer->_hostent_buffer);
 245 #endif
 246 #endif /* HAS_GETHOSTBYNAME_R */
 247 #ifdef HAS_GETLOGIN_R
 248         Safefree(PL_reentrant_buffer->_getlogin_buffer);
 249 #endif /* HAS_GETLOGIN_R */
 250 #ifdef HAS_GETNETBYNAME_R
 251 #if   !(GETNETBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
 252         Safefree(PL_reentrant_buffer->_netent_buffer);
 253 #endif
 254 #endif /* HAS_GETNETBYNAME_R */
 255 #ifdef HAS_GETPROTOBYNAME_R
 256 #if   !(GETPROTOBYNAME_R_PROTO == REENTRANT_PROTO_I_CSD)
 257         Safefree(PL_reentrant_buffer->_protoent_buffer);
 258 #endif
 259 #endif /* HAS_GETPROTOBYNAME_R */
 260 #ifdef HAS_GETPWNAM_R
 261         Safefree(PL_reentrant_buffer->_pwent_buffer);
 262 #endif /* HAS_GETPWNAM_R */
 263 #ifdef HAS_GETSERVBYNAME_R
 264 #if   !(GETSERVBYNAME_R_PROTO == REENTRANT_PROTO_I_CCSD)
 265         Safefree(PL_reentrant_buffer->_servent_buffer);
 266 #endif
 267 #endif /* HAS_GETSERVBYNAME_R */
 268 #ifdef HAS_GETSPNAM_R
 269         Safefree(PL_reentrant_buffer->_spent_buffer);
 270 #endif /* HAS_GETSPNAM_R */
 271 #ifdef HAS_GMTIME_R
 272 #endif /* HAS_GMTIME_R */
 273 #ifdef HAS_LOCALTIME_R
 274 #endif /* HAS_LOCALTIME_R */
 275 #ifdef HAS_RANDOM_R
 276 #endif /* HAS_RANDOM_R */
 277 #ifdef HAS_READDIR_R
 278         Safefree(PL_reentrant_buffer->_readdir_struct);
 279 #endif /* HAS_READDIR_R */
 280 #ifdef HAS_READDIR64_R
 281         Safefree(PL_reentrant_buffer->_readdir64_struct);
 282 #endif /* HAS_READDIR64_R */
 283 #ifdef HAS_SETLOCALE_R
 284         Safefree(PL_reentrant_buffer->_setlocale_buffer);
 285 #endif /* HAS_SETLOCALE_R */
 286 #ifdef HAS_STRERROR_R
 287         Safefree(PL_reentrant_buffer->_strerror_buffer);
 288 #endif /* HAS_STRERROR_R */
 289 #ifdef HAS_TTYNAME_R
 290         Safefree(PL_reentrant_buffer->_ttyname_buffer);
 291 #endif /* HAS_TTYNAME_R */
 292
 293         Safefree(PL_reentrant_buffer);
 294 #endif /* USE_REENTRANT_API */
 295 }
 296
 297 void*
 298 Perl_reentrant_retry(const char *f, ...)
 299 {
 300     dTHX;
 301     void *retptr = NULL;
 302 #ifdef USE_REENTRANT_API
 303 #  if defined(USE_HOSTENT_BUFFER) || defined(USE_GRENT_BUFFER) || defined(USE_NETENT_BUFFER) || defined(USE_PWENT_BUFFER) || defined(USE_PROTOENT_BUFFER) || defined(USE_SRVENT_BUFFER)
 304     void *p0;
 305 #  endif
 306 #  if defined(USE_SERVENT_BUFFER)
 307     void *p1;
 308 #  endif
 309 #  if defined(USE_HOSTENT_BUFFER)
 310     size_t asize;
 311 #  endif
 312 #  if defined(USE_HOSTENT_BUFFER) || defined(USE_NETENT_BUFFER) || defined(USE_PROTOENT_BUFFER) || defined(USE_SERVENT_BUFFER)
 313     int anint;
 314 #  endif
 315     va_list ap;
 316
 317     va_start(ap, f);
 318
 319     switch (PL_op->op_type) {
 320 #ifdef USE_HOSTENT_BUFFER
 321     case OP_GHBYADDR:
 322     case OP_GHBYNAME:
 323     case OP_GHOSTENT:
 324         {
 325 #ifdef PERL_REENTRANT_MAXSIZE
 326             if (PL_reentrant_buffer->_hostent_size <=
 327                 PERL_REENTRANT_MAXSIZE / 2)
 328 #endif
 329             {
 330                 PL_reentrant_buffer->_hostent_size *= 2;
 331                 Renew(PL_reentrant_buffer->_hostent_buffer,
 332                       PL_reentrant_buffer->_hostent_size, char);
 333                 switch (PL_op->op_type) {
 334                 case OP_GHBYADDR:
 335                     p0    = va_arg(ap, void *);
 336                     asize = va_arg(ap, size_t);
 337                     anint  = va_arg(ap, int);
 338                     retptr = gethostbyaddr(p0, asize, anint); break;
 339                 case OP_GHBYNAME:
 340                     p0 = va_arg(ap, void *);
 341                     retptr = gethostbyname(p0); break;
 342                 case OP_GHOSTENT:
 343                     retptr = gethostent(); break;
 344                 default:
 345                     SETERRNO(ERANGE, LIB_INVARG);
 346                     break;
 347                 }
 348             }
 349         }
 350         break;
 351 #endif
 352 #ifdef USE_GRENT_BUFFER
 353     case OP_GGRNAM:
 354     case OP_GGRGID:
 355     case OP_GGRENT:
 356         {
 357 #ifdef PERL_REENTRANT_MAXSIZE
 358             if (PL_reentrant_buffer->_grent_size <=
 359                 PERL_REENTRANT_MAXSIZE / 2)
 360 #endif
 361             {
 362                 Gid_t gid;
 363                 PL_reentrant_buffer->_grent_size *= 2;
 364                 Renew(PL_reentrant_buffer->_grent_buffer,
 365                       PL_reentrant_buffer->_grent_size, char);
 366                 switch (PL_op->op_type) {
 367                 case OP_GGRNAM:
 368                     p0 = va_arg(ap, void *);
 369                     retptr = getgrnam(p0); break;
 370                 case OP_GGRGID:
 371 #if Gid_t_size < INTSIZE
 372                     gid = (Gid_t)va_arg(ap, int);
 373 #else
 374                     gid = va_arg(ap, Gid_t);
 375 #endif
 376                     retptr = getgrgid(gid); break;
 377                 case OP_GGRENT:
 378                     retptr = getgrent(); break;
 379                 default:
 380                     SETERRNO(ERANGE, LIB_INVARG);
 381                     break;
 382                 }
 383             }
 384         }
 385         break;
 386 #endif
 387 #ifdef USE_NETENT_BUFFER
 388     case OP_GNBYADDR:
 389     case OP_GNBYNAME:
 390     case OP_GNETENT:
 391         {
 392 #ifdef PERL_REENTRANT_MAXSIZE
 393             if (PL_reentrant_buffer->_netent_size <=
 394                 PERL_REENTRANT_MAXSIZE / 2)
 395 #endif
 396             {
 397                 Netdb_net_t net;
 398                 PL_reentrant_buffer->_netent_size *= 2;
 399                 Renew(PL_reentrant_buffer->_netent_buffer,
 400                       PL_reentrant_buffer->_netent_size, char);
 401                 switch (PL_op->op_type) {
 402                 case OP_GNBYADDR:
 403                     net = va_arg(ap, Netdb_net_t);
 404                     anint = va_arg(ap, int);
 405                     retptr = getnetbyaddr(net, anint); break;
 406                 case OP_GNBYNAME:
 407                     p0 = va_arg(ap, void *);
 408                     retptr = getnetbyname(p0); break;
 409                 case OP_GNETENT:
 410                     retptr = getnetent(); break;
 411                 default:
 412                     SETERRNO(ERANGE, LIB_INVARG);
 413                     break;
 414                 }
 415             }
 416         }
 417         break;
 418 #endif
 419 #ifdef USE_PWENT_BUFFER
 420     case OP_GPWNAM:
 421     case OP_GPWUID:
 422     case OP_GPWENT:
 423         {
 424 #ifdef PERL_REENTRANT_MAXSIZE
 425             if (PL_reentrant_buffer->_pwent_size <=
 426                 PERL_REENTRANT_MAXSIZE / 2)
 427 #endif
 428             {
 429                 Uid_t uid;
 430                 PL_reentrant_buffer->_pwent_size *= 2;
 431                 Renew(PL_reentrant_buffer->_pwent_buffer,
 432                       PL_reentrant_buffer->_pwent_size, char);
 433                 switch (PL_op->op_type) {
 434                 case OP_GPWNAM:
 435                     p0 = va_arg(ap, void *);
 436                     retptr = getpwnam(p0); break;
 437                 case OP_GPWUID:
 438 #if Uid_t_size < INTSIZE
 439                     uid = (Uid_t)va_arg(ap, int);
 440 #else
 441                     uid = va_arg(ap, Uid_t);
 442 #endif
 443                     retptr = getpwuid(uid); break;
 444                 case OP_GPWENT:
 445                     retptr = getpwent(); break;
 446                 default:
 447                     SETERRNO(ERANGE, LIB_INVARG);
 448                     break;
 449                 }
 450             }
 451         }
 452         break;
 453 #endif
 454 #ifdef USE_PROTOENT_BUFFER
 455     case OP_GPBYNAME:
 456     case OP_GPBYNUMBER:
 457     case OP_GPROTOENT:
 458         {
 459 #ifdef PERL_REENTRANT_MAXSIZE
 460             if (PL_reentrant_buffer->_protoent_size <=
 461                 PERL_REENTRANT_MAXSIZE / 2)
 462 #endif
 463             {
 464                 PL_reentrant_buffer->_protoent_size *= 2;
 465                 Renew(PL_reentrant_buffer->_protoent_buffer,
 466                       PL_reentrant_buffer->_protoent_size, char);
 467                 switch (PL_op->op_type) {
 468                 case OP_GPBYNAME:
 469                     p0 = va_arg(ap, void *);
 470                     retptr = getprotobyname(p0); break;
 471                 case OP_GPBYNUMBER:
 472                     anint = va_arg(ap, int);
 473                     retptr = getprotobynumber(anint); break;
 474                 case OP_GPROTOENT:
 475                     retptr = getprotoent(); break;
 476                 default:
 477                     SETERRNO(ERANGE, LIB_INVARG);
 478                     break;
 479                 }
 480             }
 481         }
 482         break;
 483 #endif
 484 #ifdef USE_SERVENT_BUFFER
 485     case OP_GSBYNAME:
 486     case OP_GSBYPORT:
 487     case OP_GSERVENT:
 488         {
 489 #ifdef PERL_REENTRANT_MAXSIZE
 490             if (PL_reentrant_buffer->_servent_size <=
 491                 PERL_REENTRANT_MAXSIZE / 2)
 492 #endif
 493             {
 494                 PL_reentrant_buffer->_servent_size *= 2;
 495                 Renew(PL_reentrant_buffer->_servent_buffer,
 496                       PL_reentrant_buffer->_servent_size, char);
 497                 switch (PL_op->op_type) {
 498                 case OP_GSBYNAME:
 499                     p0 = va_arg(ap, void *);
 500                     p1 = va_arg(ap, void *);
 501                     retptr = getservbyname(p0, p1); break;
 502                 case OP_GSBYPORT:
 503                     anint = va_arg(ap, int);
 504                     p0 = va_arg(ap, void *);
 505                     retptr = getservbyport(anint, p0); break;
 506                 case OP_GSERVENT:
 507                     retptr = getservent(); break;
 508                 default:
 509                     SETERRNO(ERANGE, LIB_INVARG);
 510                     break;
 511                 }
 512             }
 513         }
 514         break;
 515 #endif
 516     default:
 517         /* Not known how to retry, so just fail. */
 518         break;
 519     }
 520
 521     va_end(ap);
 522 #endif
 523     return retptr;
 524 }
 525