stdlib/stdlib.h

   1 /* Copyright (C) 1991-2023 Free Software Foundation, Inc.
   2    Copyright The GNU Toolchain Authors.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 /*
  20  *      ISO C99 Standard: 7.20 General utilities        <stdlib.h>
  21  */
  22
  23 #ifndef _STDLIB_H
  24
  25 #define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION
  26 #include <bits/libc-header-start.h>
  27
  28 /* Get size_t, wchar_t and NULL from <stddef.h>.  */
  29 #define __need_size_t
  30 #define __need_wchar_t
  31 #define __need_NULL
  32 #include <stddef.h>
  33
  34 __BEGIN_DECLS
  35
  36 #define _STDLIB_H       1
  37
  38 #if (defined __USE_XOPEN || defined __USE_XOPEN2K8) && !defined _SYS_WAIT_H
  39 /* XPG requires a few symbols from <sys/wait.h> being defined.  */
  40 # include <bits/waitflags.h>
  41 # include <bits/waitstatus.h>
  42
  43 /* Define the macros <sys/wait.h> also would define this way.  */
  44 # define WEXITSTATUS(status)    __WEXITSTATUS (status)
  45 # define WTERMSIG(status)       __WTERMSIG (status)
  46 # define WSTOPSIG(status)       __WSTOPSIG (status)
  47 # define WIFEXITED(status)      __WIFEXITED (status)
  48 # define WIFSIGNALED(status)    __WIFSIGNALED (status)
  49 # define WIFSTOPPED(status)     __WIFSTOPPED (status)
  50 # ifdef __WIFCONTINUED
  51 #  define WIFCONTINUED(status)  __WIFCONTINUED (status)
  52 # endif
  53 #endif  /* X/Open or XPG7 and <sys/wait.h> not included.  */
  54
  55 /* _FloatN API tests for enablement.  */
  56 #include <bits/floatn.h>
  57
  58 /* Returned by `div'.  */
  59 typedef struct
  60   {
  61     int quot;                   /* Quotient.  */
  62     int rem;                    /* Remainder.  */
  63   } div_t;
  64
  65 /* Returned by `ldiv'.  */
  66 #ifndef __ldiv_t_defined
  67 typedef struct
  68   {
  69     long int quot;              /* Quotient.  */
  70     long int rem;               /* Remainder.  */
  71   } ldiv_t;
  72 # define __ldiv_t_defined       1
  73 #endif
  74
  75 #if defined __USE_ISOC99 && !defined __lldiv_t_defined
  76 /* Returned by `lldiv'.  */
  77 __extension__ typedef struct
  78   {
  79     long long int quot;         /* Quotient.  */
  80     long long int rem;          /* Remainder.  */
  81   } lldiv_t;
  82 # define __lldiv_t_defined      1
  83 #endif
  84
  85
  86 /* The largest number rand will return (same as INT_MAX).  */
  87 #define RAND_MAX        2147483647
  88
  89
  90 /* We define these the same for all machines.
  91    Changes from this to the outside world should be done in `_exit'.  */
  92 #define EXIT_FAILURE    1       /* Failing exit status.  */
  93 #define EXIT_SUCCESS    0       /* Successful exit status.  */
  94
  95
  96 /* Maximum length of a multibyte character in the current locale.  */
  97 #define MB_CUR_MAX      (__ctype_get_mb_cur_max ())
  98 extern size_t __ctype_get_mb_cur_max (void) __THROW __wur;
  99
 100
 101 /* Convert a string to a floating-point number.  */
 102 extern double atof (const char *__nptr)
 103      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 104 /* Convert a string to an integer.  */
 105 extern int atoi (const char *__nptr)
 106      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 107 /* Convert a string to a long integer.  */
 108 extern long int atol (const char *__nptr)
 109      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 110
 111 #ifdef __USE_ISOC99
 112 /* Convert a string to a long long integer.  */
 113 __extension__ extern long long int atoll (const char *__nptr)
 114      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 115 #endif
 116
 117 /* Convert a string to a floating-point number.  */
 118 extern double strtod (const char *__restrict __nptr,
 119                       char **__restrict __endptr)
 120      __THROW __nonnull ((1));
 121
 122 #ifdef  __USE_ISOC99
 123 /* Likewise for `float' and `long double' sizes of floating-point numbers.  */
 124 extern float strtof (const char *__restrict __nptr,
 125                      char **__restrict __endptr) __THROW __nonnull ((1));
 126
 127 extern long double strtold (const char *__restrict __nptr,
 128                             char **__restrict __endptr)
 129      __THROW __nonnull ((1));
 130 #endif
 131
 132 /* Likewise for '_FloatN' and '_FloatNx'.  */
 133
 134 #if __HAVE_FLOAT16 && __GLIBC_USE (IEC_60559_TYPES_EXT)
 135 extern _Float16 strtof16 (const char *__restrict __nptr,
 136                           char **__restrict __endptr)
 137      __THROW __nonnull ((1));
 138 #endif
 139
 140 #if __HAVE_FLOAT32 && __GLIBC_USE (IEC_60559_TYPES_EXT)
 141 extern _Float32 strtof32 (const char *__restrict __nptr,
 142                           char **__restrict __endptr)
 143      __THROW __nonnull ((1));
 144 #endif
 145
 146 #if __HAVE_FLOAT64 && __GLIBC_USE (IEC_60559_TYPES_EXT)
 147 extern _Float64 strtof64 (const char *__restrict __nptr,
 148                           char **__restrict __endptr)
 149      __THROW __nonnull ((1));
 150 #endif
 151
 152 #if __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)
 153 extern _Float128 strtof128 (const char *__restrict __nptr,
 154                             char **__restrict __endptr)
 155      __THROW __nonnull ((1));
 156 #endif
 157
 158 #if __HAVE_FLOAT32X && __GLIBC_USE (IEC_60559_TYPES_EXT)
 159 extern _Float32x strtof32x (const char *__restrict __nptr,
 160                             char **__restrict __endptr)
 161      __THROW __nonnull ((1));
 162 #endif
 163
 164 #if __HAVE_FLOAT64X && __GLIBC_USE (IEC_60559_TYPES_EXT)
 165 extern _Float64x strtof64x (const char *__restrict __nptr,
 166                             char **__restrict __endptr)
 167      __THROW __nonnull ((1));
 168 #endif
 169
 170 #if __HAVE_FLOAT128X && __GLIBC_USE (IEC_60559_TYPES_EXT)
 171 extern _Float128x strtof128x (const char *__restrict __nptr,
 172                               char **__restrict __endptr)
 173      __THROW __nonnull ((1));
 174 #endif
 175
 176 /* Convert a string to a long integer.  */
 177 extern long int strtol (const char *__restrict __nptr,
 178                         char **__restrict __endptr, int __base)
 179      __THROW __nonnull ((1));
 180 /* Convert a string to an unsigned long integer.  */
 181 extern unsigned long int strtoul (const char *__restrict __nptr,
 182                                   char **__restrict __endptr, int __base)
 183      __THROW __nonnull ((1));
 184
 185 #ifdef __USE_MISC
 186 /* Convert a string to a quadword integer.  */
 187 __extension__
 188 extern long long int strtoq (const char *__restrict __nptr,
 189                              char **__restrict __endptr, int __base)
 190      __THROW __nonnull ((1));
 191 /* Convert a string to an unsigned quadword integer.  */
 192 __extension__
 193 extern unsigned long long int strtouq (const char *__restrict __nptr,
 194                                        char **__restrict __endptr, int __base)
 195      __THROW __nonnull ((1));
 196 #endif /* Use misc.  */
 197
 198 #ifdef __USE_ISOC99
 199 /* Convert a string to a quadword integer.  */
 200 __extension__
 201 extern long long int strtoll (const char *__restrict __nptr,
 202                               char **__restrict __endptr, int __base)
 203      __THROW __nonnull ((1));
 204 /* Convert a string to an unsigned quadword integer.  */
 205 __extension__
 206 extern unsigned long long int strtoull (const char *__restrict __nptr,
 207                                         char **__restrict __endptr, int __base)
 208      __THROW __nonnull ((1));
 209 #endif /* ISO C99 or use MISC.  */
 210
 211 /* Versions of the above functions that handle '0b' and '0B' prefixes
 212    in base 0 or 2.  */
 213 #if __GLIBC_USE (C2X_STRTOL)
 214 # ifdef __REDIRECT
 215 extern long int __REDIRECT_NTH (strtol, (const char *__restrict __nptr,
 216                                          char **__restrict __endptr,
 217                                          int __base), __isoc23_strtol)
 218      __nonnull ((1));
 219 extern unsigned long int __REDIRECT_NTH (strtoul,
 220                                          (const char *__restrict __nptr,
 221                                           char **__restrict __endptr,
 222                                           int __base), __isoc23_strtoul)
 223      __nonnull ((1));
 224 #  ifdef __USE_MISC
 225 __extension__
 226 extern long long int __REDIRECT_NTH (strtoq, (const char *__restrict __nptr,
 227                                               char **__restrict __endptr,
 228                                               int __base), __isoc23_strtoll)
 229      __nonnull ((1));
 230 __extension__
 231 extern unsigned long long int __REDIRECT_NTH (strtouq,
 232                                               (const char *__restrict __nptr,
 233                                                char **__restrict __endptr,
 234                                                int __base), __isoc23_strtoull)
 235      __nonnull ((1));
 236 #  endif
 237 __extension__
 238 extern long long int __REDIRECT_NTH (strtoll, (const char *__restrict __nptr,
 239                                                char **__restrict __endptr,
 240                                                int __base), __isoc23_strtoll)
 241      __nonnull ((1));
 242 __extension__
 243 extern unsigned long long int __REDIRECT_NTH (strtoull,
 244                                               (const char *__restrict __nptr,
 245                                                char **__restrict __endptr,
 246                                                int __base), __isoc23_strtoull)
 247      __nonnull ((1));
 248 # else
 249 extern long int __isoc23_strtol (const char *__restrict __nptr,
 250                                  char **__restrict __endptr, int __base)
 251      __THROW __nonnull ((1));
 252 extern unsigned long int __isoc23_strtoul (const char *__restrict __nptr,
 253                                            char **__restrict __endptr,
 254                                            int __base)
 255      __THROW __nonnull ((1));
 256 __extension__
 257 extern long long int __isoc23_strtoll (const char *__restrict __nptr,
 258                                        char **__restrict __endptr, int __base)
 259      __THROW __nonnull ((1));
 260 __extension__
 261 extern unsigned long long int __isoc23_strtoull (const char *__restrict __nptr,
 262                                                  char **__restrict __endptr,
 263                                                  int __base)
 264      __THROW __nonnull ((1));
 265 #  define strtol __isoc23_strtol
 266 #  define strtoul __isoc23_strtoul
 267 #  ifdef __USE_MISC
 268 #   define strtoq __isoc23_strtoll
 269 #   define strtouq __isoc23_strtoull
 270 #  endif
 271 #  define strtoll __isoc23_strtoll
 272 #  define strtoull __isoc23_strtoull
 273 # endif
 274 #endif
 275
 276 /* Convert a floating-point number to a string.  */
 277 #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
 278 extern int strfromd (char *__dest, size_t __size, const char *__format,
 279                      double __f)
 280      __THROW __nonnull ((3));
 281
 282 extern int strfromf (char *__dest, size_t __size, const char *__format,
 283                      float __f)
 284      __THROW __nonnull ((3));
 285
 286 extern int strfroml (char *__dest, size_t __size, const char *__format,
 287                      long double __f)
 288      __THROW __nonnull ((3));
 289 #endif
 290
 291 #if __HAVE_FLOAT16 && __GLIBC_USE (IEC_60559_TYPES_EXT)
 292 extern int strfromf16 (char *__dest, size_t __size, const char * __format,
 293                        _Float16 __f)
 294      __THROW __nonnull ((3));
 295 #endif
 296
 297 #if __HAVE_FLOAT32 && __GLIBC_USE (IEC_60559_TYPES_EXT)
 298 extern int strfromf32 (char *__dest, size_t __size, const char * __format,
 299                        _Float32 __f)
 300      __THROW __nonnull ((3));
 301 #endif
 302
 303 #if __HAVE_FLOAT64 && __GLIBC_USE (IEC_60559_TYPES_EXT)
 304 extern int strfromf64 (char *__dest, size_t __size, const char * __format,
 305                        _Float64 __f)
 306      __THROW __nonnull ((3));
 307 #endif
 308
 309 #if __HAVE_FLOAT128 && __GLIBC_USE (IEC_60559_TYPES_EXT)
 310 extern int strfromf128 (char *__dest, size_t __size, const char * __format,
 311                         _Float128 __f)
 312      __THROW __nonnull ((3));
 313 #endif
 314
 315 #if __HAVE_FLOAT32X && __GLIBC_USE (IEC_60559_TYPES_EXT)
 316 extern int strfromf32x (char *__dest, size_t __size, const char * __format,
 317                         _Float32x __f)
 318      __THROW __nonnull ((3));
 319 #endif
 320
 321 #if __HAVE_FLOAT64X && __GLIBC_USE (IEC_60559_TYPES_EXT)
 322 extern int strfromf64x (char *__dest, size_t __size, const char * __format,
 323                         _Float64x __f)
 324      __THROW __nonnull ((3));
 325 #endif
 326
 327 #if __HAVE_FLOAT128X && __GLIBC_USE (IEC_60559_TYPES_EXT)
 328 extern int strfromf128x (char *__dest, size_t __size, const char * __format,
 329                          _Float128x __f)
 330      __THROW __nonnull ((3));
 331 #endif
 332
 333
 334 #ifdef __USE_GNU
 335 /* Parallel versions of the functions above which take the locale to
 336    use as an additional parameter.  These are GNU extensions inspired
 337    by the POSIX.1-2008 extended locale API.  */
 338 # include <bits/types/locale_t.h>
 339
 340 extern long int strtol_l (const char *__restrict __nptr,
 341                           char **__restrict __endptr, int __base,
 342                           locale_t __loc) __THROW __nonnull ((1, 4));
 343
 344 extern unsigned long int strtoul_l (const char *__restrict __nptr,
 345                                     char **__restrict __endptr,
 346                                     int __base, locale_t __loc)
 347      __THROW __nonnull ((1, 4));
 348
 349 __extension__
 350 extern long long int strtoll_l (const char *__restrict __nptr,
 351                                 char **__restrict __endptr, int __base,
 352                                 locale_t __loc)
 353      __THROW __nonnull ((1, 4));
 354
 355 __extension__
 356 extern unsigned long long int strtoull_l (const char *__restrict __nptr,
 357                                           char **__restrict __endptr,
 358                                           int __base, locale_t __loc)
 359      __THROW __nonnull ((1, 4));
 360
 361 /* Versions of the above functions that handle '0b' and '0B' prefixes
 362    in base 0 or 2.  */
 363 # if __GLIBC_USE (C2X_STRTOL)
 364 #  ifdef __REDIRECT
 365 extern long int __REDIRECT_NTH (strtol_l, (const char *__restrict __nptr,
 366                                            char **__restrict __endptr,
 367                                            int __base, locale_t __loc),
 368                                 __isoc23_strtol_l)
 369      __nonnull ((1, 4));
 370 extern unsigned long int __REDIRECT_NTH (strtoul_l,
 371                                          (const char *__restrict __nptr,
 372                                           char **__restrict __endptr,
 373                                           int __base, locale_t __loc),
 374                                          __isoc23_strtoul_l)
 375      __nonnull ((1, 4));
 376 __extension__
 377 extern long long int __REDIRECT_NTH (strtoll_l, (const char *__restrict __nptr,
 378                                                  char **__restrict __endptr,
 379                                                  int __base,
 380                                                  locale_t __loc),
 381                                      __isoc23_strtoll_l)
 382      __nonnull ((1, 4));
 383 __extension__
 384 extern unsigned long long int __REDIRECT_NTH (strtoull_l,
 385                                               (const char *__restrict __nptr,
 386                                                char **__restrict __endptr,
 387                                                int __base, locale_t __loc),
 388                                               __isoc23_strtoull_l)
 389      __nonnull ((1, 4));
 390 #  else
 391 extern long int __isoc23_strtol_l (const char *__restrict __nptr,
 392                                    char **__restrict __endptr, int __base,
 393                                    locale_t __loc) __THROW __nonnull ((1, 4));
 394 extern unsigned long int __isoc23_strtoul_l (const char *__restrict __nptr,
 395                                              char **__restrict __endptr,
 396                                              int __base, locale_t __loc)
 397      __THROW __nonnull ((1, 4));
 398 __extension__
 399 extern long long int __isoc23_strtoll_l (const char *__restrict __nptr,
 400                                          char **__restrict __endptr,
 401                                          int __base, locale_t __loc)
 402      __THROW __nonnull ((1, 4));
 403 __extension__
 404 extern unsigned long long int __isoc23_strtoull_l (const char *__restrict __nptr,
 405                                                    char **__restrict __endptr,
 406                                                    int __base, locale_t __loc)
 407      __THROW __nonnull ((1, 4));
 408 #   define strtol_l __isoc23_strtol_l
 409 #   define strtoul_l __isoc23_strtoul_l
 410 #   define strtoll_l __isoc23_strtoll_l
 411 #   define strtoull_l __isoc23_strtoull_l
 412 #  endif
 413 # endif
 414
 415 extern double strtod_l (const char *__restrict __nptr,
 416                         char **__restrict __endptr, locale_t __loc)
 417      __THROW __nonnull ((1, 3));
 418
 419 extern float strtof_l (const char *__restrict __nptr,
 420                        char **__restrict __endptr, locale_t __loc)
 421      __THROW __nonnull ((1, 3));
 422
 423 extern long double strtold_l (const char *__restrict __nptr,
 424                               char **__restrict __endptr,
 425                               locale_t __loc)
 426      __THROW __nonnull ((1, 3));
 427
 428 # if __HAVE_FLOAT16
 429 extern _Float16 strtof16_l (const char *__restrict __nptr,
 430                             char **__restrict __endptr,
 431                             locale_t __loc)
 432      __THROW __nonnull ((1, 3));
 433 # endif
 434
 435 # if __HAVE_FLOAT32
 436 extern _Float32 strtof32_l (const char *__restrict __nptr,
 437                             char **__restrict __endptr,
 438                             locale_t __loc)
 439      __THROW __nonnull ((1, 3));
 440 # endif
 441
 442 # if __HAVE_FLOAT64
 443 extern _Float64 strtof64_l (const char *__restrict __nptr,
 444                             char **__restrict __endptr,
 445                             locale_t __loc)
 446      __THROW __nonnull ((1, 3));
 447 # endif
 448
 449 # if __HAVE_FLOAT128
 450 extern _Float128 strtof128_l (const char *__restrict __nptr,
 451                               char **__restrict __endptr,
 452                               locale_t __loc)
 453      __THROW __nonnull ((1, 3));
 454 # endif
 455
 456 # if __HAVE_FLOAT32X
 457 extern _Float32x strtof32x_l (const char *__restrict __nptr,
 458                               char **__restrict __endptr,
 459                               locale_t __loc)
 460      __THROW __nonnull ((1, 3));
 461 # endif
 462
 463 # if __HAVE_FLOAT64X
 464 extern _Float64x strtof64x_l (const char *__restrict __nptr,
 465                               char **__restrict __endptr,
 466                               locale_t __loc)
 467      __THROW __nonnull ((1, 3));
 468 # endif
 469
 470 # if __HAVE_FLOAT128X
 471 extern _Float128x strtof128x_l (const char *__restrict __nptr,
 472                                 char **__restrict __endptr,
 473                                 locale_t __loc)
 474      __THROW __nonnull ((1, 3));
 475 # endif
 476 #endif /* GNU */
 477
 478
 479 #ifdef __USE_EXTERN_INLINES
 480 __extern_inline int
 481 __NTH (atoi (const char *__nptr))
 482 {
 483   return (int) strtol (__nptr, (char **) NULL, 10);
 484 }
 485 __extern_inline long int
 486 __NTH (atol (const char *__nptr))
 487 {
 488   return strtol (__nptr, (char **) NULL, 10);
 489 }
 490
 491 # ifdef __USE_ISOC99
 492 __extension__ __extern_inline long long int
 493 __NTH (atoll (const char *__nptr))
 494 {
 495   return strtoll (__nptr, (char **) NULL, 10);
 496 }
 497 # endif
 498 #endif /* Optimizing and Inlining.  */
 499
 500
 501 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 502 /* Convert N to base 64 using the digits "./0-9A-Za-z", least-significant
 503    digit first.  Returns a pointer to static storage overwritten by the
 504    next call.  */
 505 extern char *l64a (long int __n) __THROW __wur;
 506
 507 /* Read a number from a string S in base 64 as above.  */
 508 extern long int a64l (const char *__s)
 509      __THROW __attribute_pure__ __nonnull ((1)) __wur;
 510
 511 #endif  /* Use misc || extended X/Open.  */
 512
 513 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 514 # include <sys/types.h> /* we need int32_t... */
 515
 516 /* These are the functions that actually do things.  The `random', `srandom',
 517    `initstate' and `setstate' functions are those from BSD Unices.
 518    The `rand' and `srand' functions are required by the ANSI standard.
 519    We provide both interfaces to the same random number generator.  */
 520 /* Return a random long integer between 0 and 2^31-1 inclusive.  */
 521 extern long int random (void) __THROW;
 522
 523 /* Seed the random number generator with the given number.  */
 524 extern void srandom (unsigned int __seed) __THROW;
 525
 526 /* Initialize the random number generator to use state buffer STATEBUF,
 527    of length STATELEN, and seed it with SEED.  Optimal lengths are 8, 16,
 528    32, 64, 128 and 256, the bigger the better; values less than 8 will
 529    cause an error and values greater than 256 will be rounded down.  */
 530 extern char *initstate (unsigned int __seed, char *__statebuf,
 531                         size_t __statelen) __THROW __nonnull ((2));
 532
 533 /* Switch the random number generator to state buffer STATEBUF,
 534    which should have been previously initialized by `initstate'.  */
 535 extern char *setstate (char *__statebuf) __THROW __nonnull ((1));
 536
 537
 538 # ifdef __USE_MISC
 539 /* Reentrant versions of the `random' family of functions.
 540    These functions all use the following data structure to contain
 541    state, rather than global state variables.  */
 542
 543 struct random_data
 544   {
 545     int32_t *fptr;              /* Front pointer.  */
 546     int32_t *rptr;              /* Rear pointer.  */
 547     int32_t *state;             /* Array of state values.  */
 548     int rand_type;              /* Type of random number generator.  */
 549     int rand_deg;               /* Degree of random number generator.  */
 550     int rand_sep;               /* Distance between front and rear.  */
 551     int32_t *end_ptr;           /* Pointer behind state table.  */
 552   };
 553
 554 extern int random_r (struct random_data *__restrict __buf,
 555                      int32_t *__restrict __result) __THROW __nonnull ((1, 2));
 556
 557 extern int srandom_r (unsigned int __seed, struct random_data *__buf)
 558      __THROW __nonnull ((2));
 559
 560 extern int initstate_r (unsigned int __seed, char *__restrict __statebuf,
 561                         size_t __statelen,
 562                         struct random_data *__restrict __buf)
 563      __THROW __nonnull ((2, 4));
 564
 565 extern int setstate_r (char *__restrict __statebuf,
 566                        struct random_data *__restrict __buf)
 567      __THROW __nonnull ((1, 2));
 568 # endif /* Use misc.  */
 569 #endif  /* Use extended X/Open || misc. */
 570
 571
 572 /* Return a random integer between 0 and RAND_MAX inclusive.  */
 573 extern int rand (void) __THROW;
 574 /* Seed the random number generator with the given number.  */
 575 extern void srand (unsigned int __seed) __THROW;
 576
 577 #ifdef __USE_POSIX199506
 578 /* Reentrant interface according to POSIX.1.  */
 579 extern int rand_r (unsigned int *__seed) __THROW;
 580 #endif
 581
 582
 583 #if defined __USE_MISC || defined __USE_XOPEN
 584 /* System V style 48-bit random number generator functions.  */
 585
 586 /* Return non-negative, double-precision floating-point value in [0.0,1.0).  */
 587 extern double drand48 (void) __THROW;
 588 extern double erand48 (unsigned short int __xsubi[3]) __THROW __nonnull ((1));
 589
 590 /* Return non-negative, long integer in [0,2^31).  */
 591 extern long int lrand48 (void) __THROW;
 592 extern long int nrand48 (unsigned short int __xsubi[3])
 593      __THROW __nonnull ((1));
 594
 595 /* Return signed, long integers in [-2^31,2^31).  */
 596 extern long int mrand48 (void) __THROW;
 597 extern long int jrand48 (unsigned short int __xsubi[3])
 598      __THROW __nonnull ((1));
 599
 600 /* Seed random number generator.  */
 601 extern void srand48 (long int __seedval) __THROW;
 602 extern unsigned short int *seed48 (unsigned short int __seed16v[3])
 603      __THROW __nonnull ((1));
 604 extern void lcong48 (unsigned short int __param[7]) __THROW __nonnull ((1));
 605
 606 # ifdef __USE_MISC
 607 /* Data structure for communication with thread safe versions.  This
 608    type is to be regarded as opaque.  It's only exported because users
 609    have to allocate objects of this type.  */
 610 struct drand48_data
 611   {
 612     unsigned short int __x[3];  /* Current state.  */
 613     unsigned short int __old_x[3]; /* Old state.  */
 614     unsigned short int __c;     /* Additive const. in congruential formula.  */
 615     unsigned short int __init;  /* Flag for initializing.  */
 616     __extension__ unsigned long long int __a;   /* Factor in congruential
 617                                                    formula.  */
 618   };
 619
 620 /* Return non-negative, double-precision floating-point value in [0.0,1.0).  */
 621 extern int drand48_r (struct drand48_data *__restrict __buffer,
 622                       double *__restrict __result) __THROW __nonnull ((1, 2));
 623 extern int erand48_r (unsigned short int __xsubi[3],
 624                       struct drand48_data *__restrict __buffer,
 625                       double *__restrict __result) __THROW __nonnull ((1, 2));
 626
 627 /* Return non-negative, long integer in [0,2^31).  */
 628 extern int lrand48_r (struct drand48_data *__restrict __buffer,
 629                       long int *__restrict __result)
 630      __THROW __nonnull ((1, 2));
 631 extern int nrand48_r (unsigned short int __xsubi[3],
 632                       struct drand48_data *__restrict __buffer,
 633                       long int *__restrict __result)
 634      __THROW __nonnull ((1, 2));
 635
 636 /* Return signed, long integers in [-2^31,2^31).  */
 637 extern int mrand48_r (struct drand48_data *__restrict __buffer,
 638                       long int *__restrict __result)
 639      __THROW __nonnull ((1, 2));
 640 extern int jrand48_r (unsigned short int __xsubi[3],
 641                       struct drand48_data *__restrict __buffer,
 642                       long int *__restrict __result)
 643      __THROW __nonnull ((1, 2));
 644
 645 /* Seed random number generator.  */
 646 extern int srand48_r (long int __seedval, struct drand48_data *__buffer)
 647      __THROW __nonnull ((2));
 648
 649 extern int seed48_r (unsigned short int __seed16v[3],
 650                      struct drand48_data *__buffer) __THROW __nonnull ((1, 2));
 651
 652 extern int lcong48_r (unsigned short int __param[7],
 653                       struct drand48_data *__buffer)
 654      __THROW __nonnull ((1, 2));
 655
 656 /* Return a random integer between zero and 2**32-1 (inclusive).  */
 657 extern __uint32_t arc4random (void)
 658      __THROW __wur;
 659
 660 /* Fill the buffer with random data.  */
 661 extern void arc4random_buf (void *__buf, size_t __size)
 662      __THROW __nonnull ((1));
 663
 664 /* Return a random number between zero (inclusive) and the specified
 665    limit (exclusive).  */
 666 extern __uint32_t arc4random_uniform (__uint32_t __upper_bound)
 667      __THROW __wur;
 668 # endif /* Use misc.  */
 669 #endif  /* Use misc or X/Open.  */
 670
 671 /* Allocate SIZE bytes of memory.  */
 672 extern void *malloc (size_t __size) __THROW __attribute_malloc__
 673      __attribute_alloc_size__ ((1)) __wur;
 674 /* Allocate NMEMB elements of SIZE bytes each, all initialized to 0.  */
 675 extern void *calloc (size_t __nmemb, size_t __size)
 676      __THROW __attribute_malloc__ __attribute_alloc_size__ ((1, 2)) __wur;
 677
 678 /* Re-allocate the previously allocated block
 679    in PTR, making the new block SIZE bytes long.  */
 680 /* __attribute_malloc__ is not used, because if realloc returns
 681    the same pointer that was passed to it, aliasing needs to be allowed
 682    between objects pointed by the old and new pointers.  */
 683 extern void *realloc (void *__ptr, size_t __size)
 684      __THROW __attribute_warn_unused_result__ __attribute_alloc_size__ ((2));
 685
 686 /* Free a block allocated by `malloc', `realloc' or `calloc'.  */
 687 extern void free (void *__ptr) __THROW;
 688
 689 #ifdef __USE_MISC
 690 /* Re-allocate the previously allocated block in PTR, making the new
 691    block large enough for NMEMB elements of SIZE bytes each.  */
 692 /* __attribute_malloc__ is not used, because if reallocarray returns
 693    the same pointer that was passed to it, aliasing needs to be allowed
 694    between objects pointed by the old and new pointers.  */
 695 extern void *reallocarray (void *__ptr, size_t __nmemb, size_t __size)
 696      __THROW __attribute_warn_unused_result__
 697      __attribute_alloc_size__ ((2, 3))
 698     __attr_dealloc_free;
 699
 700 /* Add reallocarray as its own deallocator.  */
 701 extern void *reallocarray (void *__ptr, size_t __nmemb, size_t __size)
 702      __THROW __attr_dealloc (reallocarray, 1);
 703 #endif
 704
 705 #ifdef __USE_MISC
 706 # include <alloca.h>
 707 #endif /* Use misc.  */
 708
 709 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K) \
 710     || defined __USE_MISC
 711 /* Allocate SIZE bytes on a page boundary.  The storage cannot be freed.  */
 712 extern void *valloc (size_t __size) __THROW __attribute_malloc__
 713      __attribute_alloc_size__ ((1)) __wur;
 714 #endif
 715
 716 #ifdef __USE_XOPEN2K
 717 /* Allocate memory of SIZE bytes with an alignment of ALIGNMENT.  */
 718 extern int posix_memalign (void **__memptr, size_t __alignment, size_t __size)
 719      __THROW __nonnull ((1)) __wur;
 720 #endif
 721
 722 #ifdef __USE_ISOC11
 723 /* ISO C variant of aligned allocation.  */
 724 extern void *aligned_alloc (size_t __alignment, size_t __size)
 725      __THROW __attribute_malloc__ __attribute_alloc_align__ ((1))
 726      __attribute_alloc_size__ ((2)) __wur;
 727 #endif
 728
 729 /* Abort execution and generate a core-dump.  */
 730 extern void abort (void) __THROW __attribute__ ((__noreturn__));
 731
 732
 733 /* Register a function to be called when `exit' is called.  */
 734 extern int atexit (void (*__func) (void)) __THROW __nonnull ((1));
 735
 736 #if defined __USE_ISOC11 || defined __USE_ISOCXX11
 737 /* Register a function to be called when `quick_exit' is called.  */
 738 # ifdef __cplusplus
 739 extern "C++" int at_quick_exit (void (*__func) (void))
 740      __THROW __asm ("at_quick_exit") __nonnull ((1));
 741 # else
 742 extern int at_quick_exit (void (*__func) (void)) __THROW __nonnull ((1));
 743 # endif
 744 #endif
 745
 746 #ifdef  __USE_MISC
 747 /* Register a function to be called with the status
 748    given to `exit' and the given argument.  */
 749 extern int on_exit (void (*__func) (int __status, void *__arg), void *__arg)
 750      __THROW __nonnull ((1));
 751 #endif
 752
 753 /* Call all functions registered with `atexit' and `on_exit',
 754    in the reverse of the order in which they were registered,
 755    perform stdio cleanup, and terminate program execution with STATUS.  */
 756 extern void exit (int __status) __THROW __attribute__ ((__noreturn__));
 757
 758 #if defined __USE_ISOC11 || defined __USE_ISOCXX11
 759 /* Call all functions registered with `at_quick_exit' in the reverse
 760    of the order in which they were registered and terminate program
 761    execution with STATUS.  */
 762 extern void quick_exit (int __status) __THROW __attribute__ ((__noreturn__));
 763 #endif
 764
 765 #ifdef __USE_ISOC99
 766 /* Terminate the program with STATUS without calling any of the
 767    functions registered with `atexit' or `on_exit'.  */
 768 extern void _Exit (int __status) __THROW __attribute__ ((__noreturn__));
 769 #endif
 770
 771
 772 /* Return the value of envariable NAME, or NULL if it doesn't exist.  */
 773 extern char *getenv (const char *__name) __THROW __nonnull ((1)) __wur;
 774
 775 #ifdef __USE_GNU
 776 /* This function is similar to the above but returns NULL if the
 777    programs is running with SUID or SGID enabled.  */
 778 extern char *secure_getenv (const char *__name)
 779      __THROW __nonnull ((1)) __wur;
 780 #endif
 781
 782 #if defined __USE_MISC || defined __USE_XOPEN
 783 /* The SVID says this is in <stdio.h>, but this seems a better place.   */
 784 /* Put STRING, which is of the form "NAME=VALUE", in the environment.
 785    If there is no `=', remove NAME from the environment.  */
 786 extern int putenv (char *__string) __THROW __nonnull ((1));
 787 #endif
 788
 789 #ifdef __USE_XOPEN2K
 790 /* Set NAME to VALUE in the environment.
 791    If REPLACE is nonzero, overwrite an existing value.  */
 792 extern int setenv (const char *__name, const char *__value, int __replace)
 793      __THROW __nonnull ((2));
 794
 795 /* Remove the variable NAME from the environment.  */
 796 extern int unsetenv (const char *__name) __THROW __nonnull ((1));
 797 #endif
 798
 799 #ifdef  __USE_MISC
 800 /* The `clearenv' was planned to be added to POSIX.1 but probably
 801    never made it.  Nevertheless the POSIX.9 standard (POSIX bindings
 802    for Fortran 77) requires this function.  */
 803 extern int clearenv (void) __THROW;
 804 #endif
 805
 806
 807 #if defined __USE_MISC \
 808     || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8)
 809 /* Generate a unique temporary file name from TEMPLATE.
 810    The last six characters of TEMPLATE must be "XXXXXX";
 811    they are replaced with a string that makes the file name unique.
 812    Always returns TEMPLATE, it's either a temporary file name or a null
 813    string if it cannot get a unique file name.  */
 814 extern char *mktemp (char *__template) __THROW __nonnull ((1));
 815 #endif
 816
 817 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
 818 /* Generate a unique temporary file name from TEMPLATE.
 819    The last six characters of TEMPLATE must be "XXXXXX";
 820    they are replaced with a string that makes the filename unique.
 821    Returns a file descriptor open on the file for reading and writing,
 822    or -1 if it cannot create a uniquely-named file.
 823
 824    This function is a possible cancellation point and therefore not
 825    marked with __THROW.  */
 826 # ifndef __USE_FILE_OFFSET64
 827 extern int mkstemp (char *__template) __nonnull ((1)) __wur;
 828 # else
 829 #  ifdef __REDIRECT
 830 extern int __REDIRECT (mkstemp, (char *__template), mkstemp64)
 831      __nonnull ((1)) __wur;
 832 #  else
 833 #   define mkstemp mkstemp64
 834 #  endif
 835 # endif
 836 # ifdef __USE_LARGEFILE64
 837 extern int mkstemp64 (char *__template) __nonnull ((1)) __wur;
 838 # endif
 839 #endif
 840
 841 #ifdef __USE_MISC
 842 /* Similar to mkstemp, but the template can have a suffix after the
 843    XXXXXX.  The length of the suffix is specified in the second
 844    parameter.
 845
 846    This function is a possible cancellation point and therefore not
 847    marked with __THROW.  */
 848 # ifndef __USE_FILE_OFFSET64
 849 extern int mkstemps (char *__template, int __suffixlen) __nonnull ((1)) __wur;
 850 # else
 851 #  ifdef __REDIRECT
 852 extern int __REDIRECT (mkstemps, (char *__template, int __suffixlen),
 853                        mkstemps64) __nonnull ((1)) __wur;
 854 #  else
 855 #   define mkstemps mkstemps64
 856 #  endif
 857 # endif
 858 # ifdef __USE_LARGEFILE64
 859 extern int mkstemps64 (char *__template, int __suffixlen)
 860      __nonnull ((1)) __wur;
 861 # endif
 862 #endif
 863
 864 #ifdef __USE_XOPEN2K8
 865 /* Create a unique temporary directory from TEMPLATE.
 866    The last six characters of TEMPLATE must be "XXXXXX";
 867    they are replaced with a string that makes the directory name unique.
 868    Returns TEMPLATE, or a null pointer if it cannot get a unique name.
 869    The directory is created mode 700.  */
 870 extern char *mkdtemp (char *__template) __THROW __nonnull ((1)) __wur;
 871 #endif
 872
 873 #ifdef __USE_GNU
 874 /* Generate a unique temporary file name from TEMPLATE similar to
 875    mkstemp.  But allow the caller to pass additional flags which are
 876    used in the open call to create the file..
 877
 878    This function is a possible cancellation point and therefore not
 879    marked with __THROW.  */
 880 # ifndef __USE_FILE_OFFSET64
 881 extern int mkostemp (char *__template, int __flags) __nonnull ((1)) __wur;
 882 # else
 883 #  ifdef __REDIRECT
 884 extern int __REDIRECT (mkostemp, (char *__template, int __flags), mkostemp64)
 885      __nonnull ((1)) __wur;
 886 #  else
 887 #   define mkostemp mkostemp64
 888 #  endif
 889 # endif
 890 # ifdef __USE_LARGEFILE64
 891 extern int mkostemp64 (char *__template, int __flags) __nonnull ((1)) __wur;
 892 # endif
 893
 894 /* Similar to mkostemp, but the template can have a suffix after the
 895    XXXXXX.  The length of the suffix is specified in the second
 896    parameter.
 897
 898    This function is a possible cancellation point and therefore not
 899    marked with __THROW.  */
 900 # ifndef __USE_FILE_OFFSET64
 901 extern int mkostemps (char *__template, int __suffixlen, int __flags)
 902      __nonnull ((1)) __wur;
 903 # else
 904 #  ifdef __REDIRECT
 905 extern int __REDIRECT (mkostemps, (char *__template, int __suffixlen,
 906                                    int __flags), mkostemps64)
 907      __nonnull ((1)) __wur;
 908 #  else
 909 #   define mkostemps mkostemps64
 910 #  endif
 911 # endif
 912 # ifdef __USE_LARGEFILE64
 913 extern int mkostemps64 (char *__template, int __suffixlen, int __flags)
 914      __nonnull ((1)) __wur;
 915 # endif
 916 #endif
 917
 918
 919 /* Execute the given line as a shell command.
 920
 921    This function is a cancellation point and therefore not marked with
 922    __THROW.  */
 923 extern int system (const char *__command) __wur;
 924
 925
 926 #ifdef  __USE_GNU
 927 /* Return a malloc'd string containing the canonical absolute name of the
 928    existing named file.  */
 929 extern char *canonicalize_file_name (const char *__name)
 930      __THROW __nonnull ((1)) __attribute_malloc__
 931      __attr_dealloc_free __wur;
 932 #endif
 933
 934 #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
 935 /* Return the canonical absolute name of file NAME.  If RESOLVED is
 936    null, the result is malloc'd; otherwise, if the canonical name is
 937    PATH_MAX chars or more, returns null with `errno' set to
 938    ENAMETOOLONG; if the name fits in fewer than PATH_MAX chars,
 939    returns the name in RESOLVED.  */
 940 extern char *realpath (const char *__restrict __name,
 941                        char *__restrict __resolved) __THROW __wur;
 942 #endif
 943
 944
 945 /* Shorthand for type of comparison functions.  */
 946 #ifndef __COMPAR_FN_T
 947 # define __COMPAR_FN_T
 948 typedef int (*__compar_fn_t) (const void *, const void *);
 949
 950 # ifdef __USE_GNU
 951 typedef __compar_fn_t comparison_fn_t;
 952 # endif
 953 #endif
 954 #ifdef __USE_GNU
 955 typedef int (*__compar_d_fn_t) (const void *, const void *, void *);
 956 #endif
 957
 958 /* Do a binary search for KEY in BASE, which consists of NMEMB elements
 959    of SIZE bytes each, using COMPAR to perform the comparisons.  */
 960 extern void *bsearch (const void *__key, const void *__base,
 961                       size_t __nmemb, size_t __size, __compar_fn_t __compar)
 962      __nonnull ((1, 2, 5)) __wur;
 963
 964 #ifdef __USE_EXTERN_INLINES
 965 # include <bits/stdlib-bsearch.h>
 966 #endif
 967
 968 /* Sort NMEMB elements of BASE, of SIZE bytes each,
 969    using COMPAR to perform the comparisons.  */
 970 extern void qsort (void *__base, size_t __nmemb, size_t __size,
 971                    __compar_fn_t __compar) __nonnull ((1, 4));
 972 #ifdef __USE_GNU
 973 extern void qsort_r (void *__base, size_t __nmemb, size_t __size,
 974                      __compar_d_fn_t __compar, void *__arg)
 975   __nonnull ((1, 4));
 976 #endif
 977
 978
 979 /* Return the absolute value of X.  */
 980 extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
 981 extern long int labs (long int __x) __THROW __attribute__ ((__const__)) __wur;
 982
 983 #ifdef __USE_ISOC99
 984 __extension__ extern long long int llabs (long long int __x)
 985      __THROW __attribute__ ((__const__)) __wur;
 986 #endif
 987
 988
 989 /* Return the `div_t', `ldiv_t' or `lldiv_t' representation
 990    of the value of NUMER over DENOM. */
 991 /* GCC may have built-ins for these someday.  */
 992 extern div_t div (int __numer, int __denom)
 993      __THROW __attribute__ ((__const__)) __wur;
 994 extern ldiv_t ldiv (long int __numer, long int __denom)
 995      __THROW __attribute__ ((__const__)) __wur;
 996
 997 #ifdef __USE_ISOC99
 998 __extension__ extern lldiv_t lldiv (long long int __numer,
 999                                     long long int __denom)
1000      __THROW __attribute__ ((__const__)) __wur;
1001 #endif
1002
1003
1004 #if (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K8) \
1005     || defined __USE_MISC
1006 /* Convert floating point numbers to strings.  The returned values are
1007    valid only until another call to the same function.  */
1008
1009 /* Convert VALUE to a string with NDIGIT digits and return a pointer to
1010    this.  Set *DECPT with the position of the decimal character and *SIGN
1011    with the sign of the number.  */
1012 extern char *ecvt (double __value, int __ndigit, int *__restrict __decpt,
1013                    int *__restrict __sign) __THROW __nonnull ((3, 4)) __wur;
1014
1015 /* Convert VALUE to a string rounded to NDIGIT decimal digits.  Set *DECPT
1016    with the position of the decimal character and *SIGN with the sign of
1017    the number.  */
1018 extern char *fcvt (double __value, int __ndigit, int *__restrict __decpt,
1019                    int *__restrict __sign) __THROW __nonnull ((3, 4)) __wur;
1020
1021 /* If possible convert VALUE to a string with NDIGIT significant digits.
1022    Otherwise use exponential representation.  The resulting string will
1023    be written to BUF.  */
1024 extern char *gcvt (double __value, int __ndigit, char *__buf)
1025      __THROW __nonnull ((3)) __wur;
1026 #endif
1027
1028 #ifdef __USE_MISC
1029 /* Long double versions of above functions.  */
1030 extern char *qecvt (long double __value, int __ndigit,
1031                     int *__restrict __decpt, int *__restrict __sign)
1032      __THROW __nonnull ((3, 4)) __wur;
1033 extern char *qfcvt (long double __value, int __ndigit,
1034                     int *__restrict __decpt, int *__restrict __sign)
1035      __THROW __nonnull ((3, 4)) __wur;
1036 extern char *qgcvt (long double __value, int __ndigit, char *__buf)
1037      __THROW __nonnull ((3)) __wur;
1038
1039
1040 /* Reentrant version of the functions above which provide their own
1041    buffers.  */
1042 extern int ecvt_r (double __value, int __ndigit, int *__restrict __decpt,
1043                    int *__restrict __sign, char *__restrict __buf,
1044                    size_t __len) __THROW __nonnull ((3, 4, 5));
1045 extern int fcvt_r (double __value, int __ndigit, int *__restrict __decpt,
1046                    int *__restrict __sign, char *__restrict __buf,
1047                    size_t __len) __THROW __nonnull ((3, 4, 5));
1048
1049 extern int qecvt_r (long double __value, int __ndigit,
1050                     int *__restrict __decpt, int *__restrict __sign,
1051                     char *__restrict __buf, size_t __len)
1052      __THROW __nonnull ((3, 4, 5));
1053 extern int qfcvt_r (long double __value, int __ndigit,
1054                     int *__restrict __decpt, int *__restrict __sign,
1055                     char *__restrict __buf, size_t __len)
1056      __THROW __nonnull ((3, 4, 5));
1057 #endif  /* misc */
1058
1059
1060 /* Return the length of the multibyte character
1061    in S, which is no longer than N.  */
1062 extern int mblen (const char *__s, size_t __n) __THROW;
1063 /* Return the length of the given multibyte character,
1064    putting its `wchar_t' representation in *PWC.  */
1065 extern int mbtowc (wchar_t *__restrict __pwc,
1066                    const char *__restrict __s, size_t __n) __THROW;
1067 /* Put the multibyte character represented
1068    by WCHAR in S, returning its length.  */
1069 extern int wctomb (char *__s, wchar_t __wchar) __THROW;
1070
1071
1072 /* Convert a multibyte string to a wide char string.  */
1073 extern size_t mbstowcs (wchar_t *__restrict  __pwcs,
1074                         const char *__restrict __s, size_t __n) __THROW
1075     __attr_access ((__read_only__, 2));
1076 /* Convert a wide char string to multibyte string.  */
1077 extern size_t wcstombs (char *__restrict __s,
1078                         const wchar_t *__restrict __pwcs, size_t __n)
1079      __THROW
1080   __fortified_attr_access (__write_only__, 1, 3)
1081   __attr_access ((__read_only__, 2));
1082
1083 #ifdef __USE_MISC
1084 /* Determine whether the string value of RESPONSE matches the affirmation
1085    or negative response expression as specified by the LC_MESSAGES category
1086    in the program's current locale.  Returns 1 if affirmative, 0 if
1087    negative, and -1 if not matching.  */
1088 extern int rpmatch (const char *__response) __THROW __nonnull ((1)) __wur;
1089 #endif
1090
1091
1092 #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K8
1093 /* Parse comma separated suboption from *OPTIONP and match against
1094    strings in TOKENS.  If found return index and set *VALUEP to
1095    optional value introduced by an equal sign.  If the suboption is
1096    not part of TOKENS return in *VALUEP beginning of unknown
1097    suboption.  On exit *OPTIONP is set to the beginning of the next
1098    token or at the terminating NUL character.  */
1099 extern int getsubopt (char **__restrict __optionp,
1100                       char *const *__restrict __tokens,
1101                       char **__restrict __valuep)
1102      __THROW __nonnull ((1, 2, 3)) __wur;
1103 #endif
1104
1105
1106 /* X/Open pseudo terminal handling.  */
1107
1108 #ifdef __USE_XOPEN2KXSI
1109 /* Return a master pseudo-terminal handle.  */
1110 extern int posix_openpt (int __oflag) __wur;
1111 #endif
1112
1113 #ifdef __USE_XOPEN_EXTENDED
1114 /* The next four functions all take a master pseudo-tty fd and
1115    perform an operation on the associated slave:  */
1116
1117 /* Chown the slave to the calling user.  */
1118 extern int grantpt (int __fd) __THROW;
1119
1120 /* Release an internal lock so the slave can be opened.
1121    Call after grantpt().  */
1122 extern int unlockpt (int __fd) __THROW;
1123
1124 /* Return the pathname of the pseudo terminal slave associated with
1125    the master FD is open on, or NULL on errors.
1126    The returned storage is good until the next call to this function.  */
1127 extern char *ptsname (int __fd) __THROW __wur;
1128 #endif
1129
1130 #ifdef __USE_GNU
1131 /* Store at most BUFLEN characters of the pathname of the slave pseudo
1132    terminal associated with the master FD is open on in BUF.
1133    Return 0 on success, otherwise an error number.  */
1134 extern int ptsname_r (int __fd, char *__buf, size_t __buflen)
1135      __THROW __nonnull ((2)) __fortified_attr_access (__write_only__, 2, 3);
1136
1137 /* Open a master pseudo terminal and return its file descriptor.  */
1138 extern int getpt (void);
1139 #endif
1140
1141 #ifdef __USE_MISC
1142 /* Put the 1 minute, 5 minute and 15 minute load averages into the first
1143    NELEM elements of LOADAVG.  Return the number written (never more than
1144    three, but may be less than NELEM), or -1 if an error occurred.  */
1145 extern int getloadavg (double __loadavg[], int __nelem)
1146      __THROW __nonnull ((1));
1147 #endif
1148
1149 #if defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K
1150 /* Return the index into the active-logins file (utmp) for
1151    the controlling terminal.  */
1152 extern int ttyslot (void) __THROW;
1153 #endif
1154
1155 #include <bits/stdlib-float.h>
1156
1157 /* Define some macros helping to catch buffer overflows.  */
1158 #if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
1159 # include <bits/stdlib.h>
1160 #endif
1161
1162 #include <bits/floatn.h>
1163 #if defined __LDBL_COMPAT || __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
1164 # include <bits/stdlib-ldbl.h>
1165 #endif
1166
1167 __END_DECLS
1168
1169 #endif /* stdlib.h  */