libio/stdio.h

   1 /* Define ISO C stdio on top of C++ iostreams.
   2    Copyright (C) 1991, 1994-1999, 2000, 2001 Free Software Foundation, Inc.
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /*
  21  *      ISO C99 Standard: 7.19 Input/output     <stdio.h>
  22  */
  23
  24 #ifndef _STDIO_H
  25
  26 #if !defined __need_FILE && !defined __need___FILE
  27 # define _STDIO_H       1
  28 # include <features.h>
  29
  30 __BEGIN_DECLS
  31
  32 # define __need_size_t
  33 # define __need_NULL
  34 # include <stddef.h>
  35
  36 # include <bits/types.h>
  37 # define __need_FILE
  38 # define __need___FILE
  39 #endif /* Don't need FILE.  */
  40
  41
  42 #if !defined __FILE_defined && defined __need_FILE
  43
  44 /* The opaque type of streams.  This is the definition used elsewhere.  */
  45 typedef struct _IO_FILE FILE;
  46
  47 # define __FILE_defined 1
  48 #endif /* FILE not defined.  */
  49 #undef  __need_FILE
  50
  51
  52 #if !defined ____FILE_defined && defined __need___FILE
  53
  54 /* The opaque type of streams.  This is the definition used elsewhere.  */
  55 typedef struct _IO_FILE __FILE;
  56
  57 # define ____FILE_defined       1
  58 #endif /* __FILE not defined.  */
  59 #undef  __need___FILE
  60
  61
  62 #ifdef  _STDIO_H
  63 #define _STDIO_USES_IOSTREAM
  64
  65 #include <libio.h>
  66
  67 #ifdef __USE_XOPEN
  68 # ifdef __GNUC__
  69 #  ifndef _VA_LIST_DEFINED
  70 typedef _G_va_list va_list;
  71 #   define _VA_LIST_DEFINED
  72 #  endif
  73 # else
  74 #  include <stdarg.h>
  75 # endif
  76 #endif
  77
  78 /* The type of the second argument to `fgetpos' and `fsetpos'.  */
  79 #ifndef __USE_FILE_OFFSET64
  80 typedef _G_fpos_t fpos_t;
  81 #else
  82 typedef _G_fpos64_t fpos_t;
  83 #endif
  84 #ifdef __USE_LARGEFILE64
  85 typedef _G_fpos64_t fpos64_t;
  86 #endif
  87
  88 /* The possibilities for the third argument to `setvbuf'.  */
  89 #define _IOFBF 0                /* Fully buffered.  */
  90 #define _IOLBF 1                /* Line buffered.  */
  91 #define _IONBF 2                /* No buffering.  */
  92
  93
  94 /* Default buffer size.  */
  95 #ifndef BUFSIZ
  96 # define BUFSIZ _IO_BUFSIZ
  97 #endif
  98
  99
 100 /* End of file character.
 101    Some things throughout the library rely on this being -1.  */
 102 #ifndef EOF
 103 # define EOF (-1)
 104 #endif
 105
 106
 107 /* The possibilities for the third argument to `fseek'.
 108    These values should not be changed.  */
 109 #define SEEK_SET        0       /* Seek from beginning of file.  */
 110 #define SEEK_CUR        1       /* Seek from current position.  */
 111 #define SEEK_END        2       /* Seek from end of file.  */
 112
 113
 114 #if defined __USE_SVID || defined __USE_XOPEN
 115 /* Default path prefix for `tempnam' and `tmpnam'.  */
 116 # define P_tmpdir       "/tmp"
 117 #endif
 118
 119
 120 /* Get the values:
 121    L_tmpnam     How long an array of chars must be to be passed to `tmpnam'.
 122    TMP_MAX      The minimum number of unique filenames generated by tmpnam
 123                 (and tempnam when it uses tmpnam's name space),
 124                 or tempnam (the two are separate).
 125    L_ctermid    How long an array to pass to `ctermid'.
 126    L_cuserid    How long an array to pass to `cuserid'.
 127    FOPEN_MAX    Minimum number of files that can be open at once.
 128    FILENAME_MAX Maximum length of a filename.  */
 129 #include <bits/stdio_lim.h>
 130
 131
 132 /* Standard streams.  */
 133 extern FILE *stdin;             /* Standard input stream.  */
 134 extern FILE *stdout;            /* Standard output stream.  */
 135 extern FILE *stderr;            /* Standard error output stream.  */
 136 /* C89/C99 say they're macros.  Make them happy.  */
 137 #define stdin stdin
 138 #define stdout stdout
 139 #define stderr stderr
 140
 141 /* Remove file FILENAME.  */
 142 extern int remove (__const char *__filename) __THROW;
 143 /* Rename file OLD to NEW.  */
 144 extern int rename (__const char *__old, __const char *__new) __THROW;
 145
 146
 147 /* Create a temporary file and open it read/write.  */
 148 #ifndef __USE_FILE_OFFSET64
 149 extern FILE *tmpfile (void) __THROW;
 150 #else
 151 # ifdef __REDIRECT
 152 extern FILE *__REDIRECT (tmpfile, (void) __THROW, tmpfile64);
 153 # else
 154 #  define tmpfile tmpfile64
 155 # endif
 156 #endif
 157 #ifdef __USE_LARGEFILE64
 158 extern FILE *tmpfile64 (void) __THROW;
 159 #endif
 160 /* Generate a temporary filename.  */
 161 extern char *tmpnam (char *__s) __THROW;
 162
 163 #ifdef __USE_MISC
 164 /* This is the reentrant variant of `tmpnam'.  The only difference is
 165    that it does not allow S to be NULL.  */
 166 extern char *tmpnam_r (char *__s) __THROW;
 167 #endif
 168
 169
 170 #if defined __USE_SVID || defined __USE_XOPEN
 171 /* Generate a unique temporary filename using up to five characters of PFX
 172    if it is not NULL.  The directory to put this file in is searched for
 173    as follows: First the environment variable "TMPDIR" is checked.
 174    If it contains the name of a writable directory, that directory is used.
 175    If not and if DIR is not NULL, that value is checked.  If that fails,
 176    P_tmpdir is tried and finally "/tmp".  The storage for the filename
 177    is allocated by `malloc'.  */
 178 extern char *tempnam (__const char *__dir, __const char *__pfx)
 179      __THROW __attribute_malloc__;
 180 #endif
 181
 182
 183 /* Close STREAM.  */
 184 extern int fclose (FILE *__stream) __THROW;
 185 /* Flush STREAM, or all streams if STREAM is NULL.  */
 186 extern int fflush (FILE *__stream) __THROW;
 187
 188 #ifdef __USE_MISC
 189 /* Faster versions when locking is not required.  */
 190 extern int fflush_unlocked (FILE *__stream) __THROW;
 191 #endif
 192
 193 #ifdef __USE_GNU
 194 /* Close all streams.  */
 195 extern int fcloseall (void) __THROW;
 196 #endif
 197
 198
 199 #ifndef __USE_FILE_OFFSET64
 200 /* Open a file and create a new stream for it.  */
 201 extern FILE *fopen (__const char *__restrict __filename,
 202                     __const char *__restrict __modes) __THROW;
 203 /* Open a file, replacing an existing stream with it. */
 204 extern FILE *freopen (__const char *__restrict __filename,
 205                       __const char *__restrict __modes,
 206                       FILE *__restrict __stream) __THROW;
 207 #else
 208 # ifdef __REDIRECT
 209 extern FILE *__REDIRECT (fopen, (__const char *__restrict __filename,
 210                                  __const char *__restrict __modes) __THROW,
 211                          fopen64);
 212 extern FILE *__REDIRECT (freopen, (__const char *__restrict __filename,
 213                                    __const char *__restrict __modes,
 214                                    FILE *__restrict __stream) __THROW,
 215                          freopen64);
 216 # else
 217 #  define fopen fopen64
 218 #  define freopen freopen64
 219 # endif
 220 #endif
 221 #ifdef __USE_LARGEFILE64
 222 extern FILE *fopen64 (__const char *__restrict __filename,
 223                       __const char *__restrict __modes) __THROW;
 224 extern FILE *freopen64 (__const char *__restrict __filename,
 225                         __const char *__restrict __modes,
 226                         FILE *__restrict __stream) __THROW;
 227 #endif
 228
 229 #ifdef  __USE_POSIX
 230 /* Create a new stream that refers to an existing system file descriptor.  */
 231 extern FILE *fdopen (int __fd, __const char *__modes) __THROW;
 232 #endif
 233
 234 #ifdef  __USE_GNU
 235 /* Create a new stream that refers to the given magic cookie,
 236    and uses the given functions for input and output.  */
 237 extern FILE *fopencookie (void *__restrict __magic_cookie,
 238                           __const char *__restrict __modes,
 239                           _IO_cookie_io_functions_t __io_funcs) __THROW;
 240
 241 /* Create a new stream that refers to a memory buffer.  */
 242 extern FILE *fmemopen (void *__s, size_t __len, __const char *__modes) __THROW;
 243
 244 /* Open a stream that writes into a malloc'd buffer that is expanded as
 245    necessary.  *BUFLOC and *SIZELOC are updated with the buffer's location
 246    and the number of characters written on fflush or fclose.  */
 247 extern FILE *open_memstream (char **__restrict __bufloc,
 248                              size_t *__restrict __sizeloc) __THROW;
 249 #endif
 250
 251
 252 /* If BUF is NULL, make STREAM unbuffered.
 253    Else make it use buffer BUF, of size BUFSIZ.  */
 254 extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) __THROW;
 255 /* Make STREAM use buffering mode MODE.
 256    If BUF is not NULL, use N bytes of it for buffering;
 257    else allocate an internal buffer N bytes long.  */
 258 extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf,
 259                     int __modes, size_t __n) __THROW;
 260
 261 #ifdef  __USE_BSD
 262 /* If BUF is NULL, make STREAM unbuffered.
 263    Else make it use SIZE bytes of BUF for buffering.  */
 264 extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf,
 265                        size_t __size) __THROW;
 266
 267 /* Make STREAM line-buffered.  */
 268 extern void setlinebuf (FILE *__stream) __THROW;
 269 #endif
 270
 271
 272 /* Write formatted output to STREAM.  */
 273 extern int fprintf (FILE *__restrict __stream,
 274                     __const char *__restrict __format, ...) __THROW;
 275 /* Write formatted output to stdout.  */
 276 extern int printf (__const char *__restrict __format, ...) __THROW;
 277 /* Write formatted output to S.  */
 278 extern int sprintf (char *__restrict __s,
 279                     __const char *__restrict __format, ...) __THROW;
 280
 281 /* Write formatted output to S from argument list ARG.  */
 282 extern int vfprintf (FILE *__restrict __s, __const char *__restrict __format,
 283                      _G_va_list __arg) __THROW;
 284 /* Write formatted output to stdout from argument list ARG.  */
 285 extern int vprintf (__const char *__restrict __format, _G_va_list __arg)
 286      __THROW;
 287 /* Write formatted output to S from argument list ARG.  */
 288 extern int vsprintf (char *__restrict __s, __const char *__restrict __format,
 289                      _G_va_list __arg) __THROW;
 290
 291 #if defined __USE_BSD || defined __USE_ISOC99 || defined __USE_UNIX98
 292 /* Maximum chars of output to write in MAXLEN.  */
 293 extern int snprintf (char *__restrict __s, size_t __maxlen,
 294                      __const char *__restrict __format, ...)
 295      __THROW __attribute__ ((__format__ (__printf__, 3, 4)));
 296
 297 extern int vsnprintf (char *__restrict __s, size_t __maxlen,
 298                       __const char *__restrict __format, _G_va_list __arg)
 299      __THROW __attribute__ ((__format__ (__printf__, 3, 0)));
 300 #endif
 301
 302 #ifdef __USE_GNU
 303 /* Write formatted output to a string dynamically allocated with `malloc'.
 304    Store the address of the string in *PTR.  */
 305 extern int vasprintf (char **__restrict __ptr, __const char *__restrict __f,
 306                       _G_va_list __arg)
 307      __THROW __attribute__ ((__format__ (__printf__, 2, 0)));
 308 extern int __asprintf (char **__restrict __ptr,
 309                        __const char *__restrict __fmt, ...)
 310      __THROW __attribute__ ((__format__ (__printf__, 2, 3)));
 311 extern int asprintf (char **__restrict __ptr,
 312                      __const char *__restrict __fmt, ...)
 313      __THROW __attribute__ ((__format__ (__printf__, 2, 3)));
 314
 315 /* Write formatted output to a file descriptor.  */
 316 extern int vdprintf (int __fd, __const char *__restrict __fmt,
 317                      _G_va_list __arg)
 318      __THROW __attribute__ ((__format__ (__printf__, 2, 0)));
 319 extern int dprintf (int __fd, __const char *__restrict __fmt, ...)
 320      __THROW __attribute__ ((__format__ (__printf__, 2, 3)));
 321 #endif
 322
 323
 324 /* Read formatted input from STREAM.  */
 325 extern int fscanf (FILE *__restrict __stream,
 326                    __const char *__restrict __format, ...) __THROW;
 327 /* Read formatted input from stdin.  */
 328 extern int scanf (__const char *__restrict __format, ...) __THROW;
 329 /* Read formatted input from S.  */
 330 extern int sscanf (__const char *__restrict __s,
 331                    __const char *__restrict __format, ...) __THROW;
 332
 333 #ifdef  __USE_ISOC99
 334 /* Read formatted input from S into argument list ARG.  */
 335 extern int vfscanf (FILE *__restrict __s, __const char *__restrict __format,
 336                     _G_va_list __arg)
 337      __THROW __attribute__ ((__format__ (__scanf__, 2, 0)));
 338
 339 /* Read formatted input from stdin into argument list ARG.  */
 340 extern int vscanf (__const char *__restrict __format, _G_va_list __arg)
 341      __THROW __attribute__ ((__format__ (__scanf__, 1, 0)));
 342
 343 /* Read formatted input from S into argument list ARG.  */
 344 extern int vsscanf (__const char *__restrict __s,
 345                     __const char *__restrict __format, _G_va_list __arg)
 346      __THROW __attribute__ ((__format__ (__scanf__, 2, 0)));
 347 #endif /* Use ISO C9x.  */
 348
 349
 350 /* Read a character from STREAM.  */
 351 extern int fgetc (FILE *__stream) __THROW;
 352 extern int getc (FILE *__stream) __THROW;
 353
 354 /* Read a character from stdin.  */
 355 extern int getchar (void) __THROW;
 356
 357 /* The C standard explicitly says this is a macro, so we always do the
 358    optimization for it.  */
 359 #define getc(_fp) _IO_getc (_fp)
 360
 361 #if defined __USE_POSIX || defined __USE_MISC
 362 /* These are defined in POSIX.1:1996.  */
 363 extern int getc_unlocked (FILE *__stream) __THROW;
 364 extern int getchar_unlocked (void) __THROW;
 365 #endif /* Use POSIX or MISC.  */
 366
 367 #ifdef __USE_MISC
 368 /* Faster version when locking is not necessary.  */
 369 extern int fgetc_unlocked (FILE *__stream) __THROW;
 370 #endif /* Use MISC.  */
 371
 372
 373 /* Write a character to STREAM.  */
 374 extern int fputc (int __c, FILE *__stream) __THROW;
 375 extern int putc (int __c, FILE *__stream) __THROW;
 376
 377 /* Write a character to stdout.  */
 378 extern int putchar (int __c) __THROW;
 379
 380 /* The C standard explicitly says this can be a macro,
 381    so we always do the optimization for it.  */
 382 #define putc(_ch, _fp) _IO_putc (_ch, _fp)
 383
 384 #ifdef __USE_MISC
 385 /* Faster version when locking is not necessary.  */
 386 extern int fputc_unlocked (int __c, FILE *__stream) __THROW;
 387 #endif /* Use MISC.  */
 388
 389 #if defined __USE_POSIX || defined __USE_MISC
 390 /* These are defined in POSIX.1:1996.  */
 391 extern int putc_unlocked (int __c, FILE *__stream) __THROW;
 392 extern int putchar_unlocked (int __c) __THROW;
 393 #endif /* Use POSIX or MISC.  */
 394
 395
 396 #if defined __USE_SVID || defined __USE_MISC || defined __USE_XOPEN
 397 /* Get a word (int) from STREAM.  */
 398 extern int getw (FILE *__stream) __THROW;
 399
 400 /* Write a word (int) to STREAM.  */
 401 extern int putw (int __w, FILE *__stream) __THROW;
 402 #endif
 403
 404
 405 /* Get a newline-terminated string of finite length from STREAM.  */
 406 extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
 407      __THROW;
 408
 409 #ifdef __USE_GNU
 410 /* This function does the same as `fgets' but does not lock the stream.  */
 411 extern char *fgets_unlocked (char *__restrict __s, int __n,
 412                              FILE *__restrict __stream) __THROW;
 413 #endif
 414
 415 /* Get a newline-terminated string from stdin, removing the newline.
 416    DO NOT USE THIS FUNCTION!!  There is no limit on how much it will read.  */
 417 extern char *gets (char *__s) __THROW;
 418
 419
 420 #ifdef  __USE_GNU
 421 /* Read up to (and including) a DELIMITER from STREAM into *LINEPTR
 422    (and null-terminate it). *LINEPTR is a pointer returned from malloc (or
 423    NULL), pointing to *N characters of space.  It is realloc'd as
 424    necessary.  Returns the number of characters read (not including the
 425    null terminator), or -1 on error or EOF.  */
 426 extern _IO_ssize_t __getdelim (char **__restrict __lineptr,
 427                                size_t *__restrict __n, int __delimiter,
 428                                FILE *__restrict __stream) __THROW;
 429 extern _IO_ssize_t getdelim (char **__restrict __lineptr,
 430                              size_t *__restrict __n, int __delimiter,
 431                              FILE *__restrict __stream) __THROW;
 432
 433 /* Like `getdelim', but reads up to a newline.  */
 434 extern _IO_ssize_t getline (char **__restrict __lineptr,
 435                             size_t *__restrict __n,
 436                             FILE *__restrict __stream) __THROW;
 437 #endif
 438
 439
 440 /* Write a string to STREAM.  */
 441 extern int fputs (__const char *__restrict __s, FILE *__restrict __stream)
 442      __THROW;
 443
 444 #ifdef __USE_GNU
 445 /* This function does the same as `fputs' but does not lock the stream.  */
 446 extern int fputs_unlocked (__const char *__restrict __s,
 447                            FILE *__restrict __stream) __THROW;
 448 #endif
 449
 450 /* Write a string, followed by a newline, to stdout.  */
 451 extern int puts (__const char *__s) __THROW;
 452
 453
 454 /* Push a character back onto the input buffer of STREAM.  */
 455 extern int ungetc (int __c, FILE *__stream) __THROW;
 456
 457
 458 /* Read chunks of generic data from STREAM.  */
 459 extern size_t fread (void *__restrict __ptr, size_t __size,
 460                      size_t __n, FILE *__restrict __stream) __THROW;
 461 /* Write chunks of generic data to STREAM.  */
 462 extern size_t fwrite (__const void *__restrict __ptr, size_t __size,
 463                       size_t __n, FILE *__restrict __s) __THROW;
 464
 465 #ifdef __USE_MISC
 466 /* Faster versions when locking is not necessary.  */
 467 extern size_t fread_unlocked (void *__restrict __ptr, size_t __size,
 468                               size_t __n, FILE *__restrict __stream) __THROW;
 469 extern size_t fwrite_unlocked (__const void *__restrict __ptr, size_t __size,
 470                                size_t __n, FILE *__restrict __stream) __THROW;
 471 #endif
 472
 473
 474 /* Seek to a certain position on STREAM.  */
 475 extern int fseek (FILE *__stream, long int __off, int __whence) __THROW;
 476 /* Return the current position of STREAM.  */
 477 extern long int ftell (FILE *__stream) __THROW;
 478 /* Rewind to the beginning of STREAM.  */
 479 extern void rewind (FILE *__stream) __THROW;
 480
 481 /* The Single Unix Specification, Version 2, specifies an alternative,
 482    more adequate interface for the two functions above which deal with
 483    file offset.  `long int' is not the right type.  These definitions
 484    are originally defined in the Large File Support API.  */
 485
 486 #ifndef __USE_FILE_OFFSET64
 487 # ifdef __USE_LARGEFILE
 488 /* Seek to a certain position on STREAM.  */
 489 extern int fseeko (FILE *__stream, __off_t __off, int __whence) __THROW;
 490 /* Return the current position of STREAM.  */
 491 extern __off_t ftello (FILE *__stream) __THROW;
 492 # endif
 493
 494 /* Get STREAM's position.  */
 495 extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos)
 496      __THROW;
 497 /* Set STREAM's position.  */
 498 extern int fsetpos (FILE *__stream, __const fpos_t *__pos) __THROW;
 499 #else
 500 # ifdef __REDIRECT
 501 #  ifdef __USE_LARGEFILE
 502 extern int __REDIRECT (fseeko,
 503                        (FILE *__stream, __off64_t __off, int __whence) __THROW,
 504                        fseeko64);
 505 extern __off64_t __REDIRECT (ftello, (FILE *__stream) __THROW, ftello64);
 506 #  endif
 507 extern int __REDIRECT (fgetpos, (FILE *__restrict __stream,
 508                                  fpos_t *__restrict __pos) __THROW, fgetpos64);
 509 extern int __REDIRECT (fsetpos,
 510                        (FILE *__stream, __const fpos_t *__pos) __THROW,
 511                        fsetpos64);
 512 # else
 513 #  ifdef __USE_LARGEFILE
 514 #   define fseeko fseeko64
 515 #   define ftello ftello64
 516 #  endif
 517 #  define fgetpos fgetpos64
 518 #  define fsetpos fsetpos64
 519 # endif
 520 #endif
 521
 522 #ifdef __USE_LARGEFILE64
 523 extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence) __THROW;
 524 extern __off64_t ftello64 (FILE *__stream) __THROW;
 525 extern int fgetpos64 (FILE *__restrict __stream, fpos64_t *__restrict __pos)
 526      __THROW;
 527 extern int fsetpos64 (FILE *__stream, __const fpos64_t *__pos) __THROW;
 528 #endif
 529
 530 /* Clear the error and EOF indicators for STREAM.  */
 531 extern void clearerr (FILE *__stream) __THROW;
 532 /* Return the EOF indicator for STREAM.  */
 533 extern int feof (FILE *__stream) __THROW;
 534 /* Return the error indicator for STREAM.  */
 535 extern int ferror (FILE *__stream) __THROW;
 536
 537 #ifdef __USE_MISC
 538 /* Faster versions when locking is not required.  */
 539 extern void clearerr_unlocked (FILE *__stream) __THROW;
 540 extern int feof_unlocked (FILE *__stream) __THROW;
 541 extern int ferror_unlocked (FILE *__stream) __THROW;
 542 #endif
 543
 544
 545 /* Print a message describing the meaning of the value of errno.  */
 546 extern void perror (__const char *__s) __THROW;
 547
 548 /* These variables normally should not be used directly.  The `strerror'
 549    function provides all the needed functionality.  */
 550 #ifdef  __USE_BSD
 551 extern int sys_nerr;
 552 extern __const char *__const sys_errlist[];
 553 #endif
 554 #ifdef  __USE_GNU
 555 extern int _sys_nerr;
 556 extern __const char *__const _sys_errlist[];
 557 #endif
 558
 559
 560 #ifdef  __USE_POSIX
 561 /* Return the system file descriptor for STREAM.  */
 562 extern int fileno (FILE *__stream) __THROW;
 563 #endif /* Use POSIX.  */
 564
 565 #ifdef __USE_MISC
 566 /* Faster version when locking is not required.  */
 567 extern int fileno_unlocked (FILE *__stream) __THROW;
 568 #endif
 569
 570
 571 #if (defined __USE_POSIX2 || defined __USE_SVID  || defined __USE_BSD || \
 572      defined __USE_MISC)
 573 /* Create a new stream connected to a pipe running the given command.  */
 574 extern FILE *popen (__const char *__command, __const char *__modes) __THROW;
 575
 576 /* Close a stream opened by popen and return the status of its child.  */
 577 extern int pclose (FILE *__stream) __THROW;
 578 #endif
 579
 580
 581 #ifdef  __USE_POSIX
 582 /* Return the name of the controlling terminal.  */
 583 extern char *ctermid (char *__s) __THROW;
 584 #endif /* Use POSIX.  */
 585
 586
 587 #ifdef __USE_XOPEN
 588 /* Return the name of the current user.  */
 589 extern char *cuserid (char *__s) __THROW;
 590 #endif /* Use X/Open, but not issue 6.  */
 591
 592
 593 #ifdef  __USE_GNU
 594 struct obstack;                 /* See <obstack.h>.  */
 595
 596 /* Write formatted output to an obstack.  */
 597 extern int obstack_printf (struct obstack *__restrict __obstack,
 598                            __const char *__restrict __format, ...) __THROW;
 599 extern int obstack_vprintf (struct obstack *__restrict __obstack,
 600                             __const char *__restrict __format,
 601                             _G_va_list __args) __THROW;
 602 #endif /* Use GNU.  */
 603
 604
 605 #if defined __USE_POSIX || defined __USE_MISC
 606 /* These are defined in POSIX.1:1996.  */
 607
 608 /* Acquire ownership of STREAM.  */
 609 extern void flockfile (FILE *__stream) __THROW;
 610
 611 /* Try to acquire ownership of STREAM but do not block if it is not
 612    possible.  */
 613 extern int ftrylockfile (FILE *__stream) __THROW;
 614
 615 /* Relinquish the ownership granted for STREAM.  */
 616 extern void funlockfile (FILE *__stream) __THROW;
 617 #endif /* POSIX || misc */
 618
 619 #if defined __USE_XOPEN && !defined __USE_XOPEN2K && !defined __USE_GNU
 620 /* The X/Open standard requires some functions and variables to be
 621    declared here which do not belong into this header.  But we have to
 622    follow.  In GNU mode we don't do this nonsense.  */
 623 # define __need_getopt
 624 # include <getopt.h>
 625 #endif  /* X/Open, but not issue 6 and not for GNU.  */
 626
 627 /* If we are compiling with optimizing read this file.  It contains
 628    several optimizing inline functions and macros.  */
 629 #ifdef __USE_EXTERN_INLINES
 630 # include <bits/stdio.h>
 631 #endif
 632
 633 __END_DECLS
 634
 635 #endif /* <stdio.h> included.  */
 636
 637 #endif /* !_STDIO_H */