include/libiberty.h

   1 /* Function declarations for libiberty.
   2
   3    Copyright (C) 1997-2018 Free Software Foundation, Inc.
   4
   5    Note - certain prototypes declared in this header file are for
   6    functions whoes implementation copyright does not belong to the
   7    FSF.  Those prototypes are present in this file for reference
   8    purposes only and their presence in this file should not construed
   9    as an indication of ownership by the FSF of the implementation of
  10    those functions in any way or form whatsoever.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 2, or (at your option)
  15    any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 51 Franklin Street - Fifth Floor,
  25    Boston, MA 02110-1301, USA.
  26
  27    Written by Cygnus Support, 1994.
  28
  29    The libiberty library provides a number of functions which are
  30    missing on some operating systems.  We do not declare those here,
  31    to avoid conflicts with the system header files on operating
  32    systems that do support those functions.  In this file we only
  33    declare those functions which are specific to libiberty.  */
  34
  35 #ifndef LIBIBERTY_H
  36 #define LIBIBERTY_H
  37
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 #include "ansidecl.h"
  43
  44 /* Get a definition for size_t.  */
  45 #include <stddef.h>
  46 /* Get a definition for va_list.  */
  47 #include <stdarg.h>
  48
  49 #include <stdio.h>
  50
  51 /* If the OS supports it, ensure that the supplied stream is setup to
  52    avoid any multi-threaded locking.  Otherwise leave the FILE pointer
  53    unchanged.  If the stream is NULL do nothing.  */
  54
  55 extern void unlock_stream (FILE *);
  56
  57 /* If the OS supports it, ensure that the standard I/O streams, stdin,
  58    stdout and stderr are setup to avoid any multi-threaded locking.
  59    Otherwise do nothing.  */
  60
  61 extern void unlock_std_streams (void);
  62
  63 /* Open and return a FILE pointer.  If the OS supports it, ensure that
  64    the stream is setup to avoid any multi-threaded locking.  Otherwise
  65    return the FILE pointer unchanged.  */
  66
  67 extern FILE *fopen_unlocked (const char *, const char *);
  68 extern FILE *fdopen_unlocked (int, const char *);
  69 extern FILE *freopen_unlocked (const char *, const char *, FILE *);
  70
  71 /* Build an argument vector from a string.  Allocates memory using
  72    malloc.  Use freeargv to free the vector.  */
  73
  74 extern char **buildargv (const char *) ATTRIBUTE_MALLOC;
  75
  76 /* Free a vector returned by buildargv.  */
  77
  78 extern void freeargv (char **);
  79
  80 /* Duplicate an argument vector. Allocates memory using malloc.  Use
  81    freeargv to free the vector.  */
  82
  83 extern char **dupargv (char * const *) ATTRIBUTE_MALLOC;
  84
  85 /* Expand "@file" arguments in argv.  */
  86
  87 extern void expandargv (int *, char ***);
  88
  89 /* Write argv to an @-file, inserting necessary quoting.  */
  90
  91 extern int writeargv (char * const *, FILE *);
  92
  93 /* Return the number of elements in argv.  */
  94
  95 extern int countargv (char * const *);
  96
  97 /* Return the last component of a path name.  Note that we can't use a
  98    prototype here because the parameter is declared inconsistently
  99    across different systems, sometimes as "char *" and sometimes as
 100    "const char *" */
 101
 102 /* HAVE_DECL_* is a three-state macro: undefined, 0 or 1.  If it is
 103    undefined, we haven't run the autoconf check so provide the
 104    declaration without arguments.  If it is 0, we checked and failed
 105    to find the declaration so provide a fully prototyped one.  If it
 106    is 1, we found it so don't provide any declaration at all.  */
 107 #if !HAVE_DECL_BASENAME
 108 #if defined (__GNU_LIBRARY__ ) || defined (__linux__) \
 109  || defined (__FreeBSD__) || defined (__OpenBSD__) || defined (__NetBSD__) \
 110  || defined (__CYGWIN__) || defined (__CYGWIN32__) || defined (__MINGW32__) \
 111  || defined (__DragonFly__) || defined (HAVE_DECL_BASENAME)
 112 extern char *basename (const char *) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1);
 113 #else
 114 /* Do not allow basename to be used if there is no prototype seen.  We
 115    either need to use the above prototype or have one from
 116    autoconf which would result in HAVE_DECL_BASENAME being set.  */
 117 #define basename basename_cannot_be_used_without_a_prototype
 118 #endif
 119 #endif
 120
 121 /* A well-defined basename () that is always compiled in.  */
 122
 123 extern const char *lbasename (const char *) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1);
 124
 125 /* Same, but assumes DOS semantics (drive name, backslash is also a
 126    dir separator) regardless of host.  */
 127
 128 extern const char *dos_lbasename (const char *) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1);
 129
 130 /* Same, but assumes Unix semantics (absolute paths always start with
 131    a slash, only forward slash is accepted as dir separator)
 132    regardless of host.  */
 133
 134 extern const char *unix_lbasename (const char *) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1);
 135
 136 /* A well-defined realpath () that is always compiled in.  */
 137
 138 extern char *lrealpath (const char *);
 139
 140 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 141    the last argument of this function, to terminate the list of
 142    strings.  Allocates memory using xmalloc.  */
 143
 144 extern char *concat (const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_SENTINEL;
 145
 146 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 147    the last argument of this function, to terminate the list of
 148    strings.  Allocates memory using xmalloc.  The first argument is
 149    not one of the strings to be concatenated, but if not NULL is a
 150    pointer to be freed after the new string is created, similar to the
 151    way xrealloc works.  */
 152
 153 extern char *reconcat (char *, const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_SENTINEL;
 154
 155 /* Determine the length of concatenating an arbitrary number of
 156    strings.  You must pass NULL as the last argument of this function,
 157    to terminate the list of strings.  */
 158
 159 extern unsigned long concat_length (const char *, ...) ATTRIBUTE_SENTINEL;
 160
 161 /* Concatenate an arbitrary number of strings into a SUPPLIED area of
 162    memory.  You must pass NULL as the last argument of this function,
 163    to terminate the list of strings.  The supplied memory is assumed
 164    to be large enough.  */
 165
 166 extern char *concat_copy (char *, const char *, ...) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_NONNULL(1) ATTRIBUTE_SENTINEL;
 167
 168 /* Concatenate an arbitrary number of strings into a GLOBAL area of
 169    memory.  You must pass NULL as the last argument of this function,
 170    to terminate the list of strings.  The supplied memory is assumed
 171    to be large enough.  */
 172
 173 extern char *concat_copy2 (const char *, ...) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_SENTINEL;
 174
 175 /* This is the global area used by concat_copy2.  */
 176
 177 extern char *libiberty_concat_ptr;
 178
 179 /* Concatenate an arbitrary number of strings.  You must pass NULL as
 180    the last argument of this function, to terminate the list of
 181    strings.  Allocates memory using alloca.  The arguments are
 182    evaluated twice!  */
 183 #define ACONCAT(ACONCAT_PARAMS) \
 184   (libiberty_concat_ptr = (char *) alloca (concat_length ACONCAT_PARAMS + 1), \
 185    concat_copy2 ACONCAT_PARAMS)
 186
 187 /* Check whether two file descriptors refer to the same file.  */
 188
 189 extern int fdmatch (int fd1, int fd2);
 190
 191 /* Return the position of the first bit set in the argument.  */
 192 /* Prototypes vary from system to system, so we only provide a
 193    prototype on systems where we know that we need it.  */
 194 #if defined (HAVE_DECL_FFS) && !HAVE_DECL_FFS
 195 extern int ffs(int);
 196 #endif
 197
 198 /* Get the working directory.  The result is cached, so don't call
 199    chdir() between calls to getpwd().  */
 200
 201 extern char * getpwd (void);
 202
 203 /* Get the current time.  */
 204 /* Prototypes vary from system to system, so we only provide a
 205    prototype on systems where we know that we need it.  */
 206 #ifdef __MINGW32__
 207 /* Forward declaration to avoid #include <sys/time.h>.   */
 208 struct timeval;
 209 extern int gettimeofday (struct timeval *, void *);
 210 #endif
 211
 212 /* Get the amount of time the process has run, in microseconds.  */
 213
 214 extern long get_run_time (void);
 215
 216 /* Generate a relocated path to some installation directory.  Allocates
 217    return value using malloc.  */
 218
 219 extern char *make_relative_prefix (const char *, const char *,
 220                                    const char *) ATTRIBUTE_MALLOC;
 221
 222 /* Generate a relocated path to some installation directory without
 223    attempting to follow any soft links.  Allocates
 224    return value using malloc.  */
 225
 226 extern char *make_relative_prefix_ignore_links (const char *, const char *,
 227                                                 const char *) ATTRIBUTE_MALLOC;
 228
 229 /* Returns a pointer to a directory path suitable for creating temporary
 230    files in.  */
 231
 232 extern const char *choose_tmpdir (void) ATTRIBUTE_RETURNS_NONNULL;
 233
 234 /* Choose a temporary directory to use for scratch files.  */
 235
 236 extern char *choose_temp_base (void) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 237
 238 /* Return a temporary file name or NULL if unable to create one.  */
 239
 240 extern char *make_temp_file (const char *) ATTRIBUTE_MALLOC;
 241
 242 /* Return a temporary file name with given PREFIX and SUFFIX
 243    or NULL if unable to create one.  */
 244
 245 extern char *make_temp_file_with_prefix (const char *, const char *) ATTRIBUTE_MALLOC;
 246
 247 /* Remove a link to a file unless it is special. */
 248
 249 extern int unlink_if_ordinary (const char *);
 250
 251 /* Allocate memory filled with spaces.  Allocates using malloc.  */
 252
 253 extern const char *spaces (int count);
 254
 255 /* Return the maximum error number for which strerror will return a
 256    string.  */
 257
 258 extern int errno_max (void);
 259
 260 /* Return the name of an errno value (e.g., strerrno (EINVAL) returns
 261    "EINVAL").  */
 262
 263 extern const char *strerrno (int);
 264
 265 /* Given the name of an errno value, return the value.  */
 266
 267 extern int strtoerrno (const char *);
 268
 269 /* ANSI's strerror(), but more robust.  */
 270
 271 extern char *xstrerror (int) ATTRIBUTE_RETURNS_NONNULL;
 272
 273 /* Return the maximum signal number for which strsignal will return a
 274    string.  */
 275
 276 extern int signo_max (void);
 277
 278 /* Return a signal message string for a signal number
 279    (e.g., strsignal (SIGHUP) returns something like "Hangup").  */
 280 /* This is commented out as it can conflict with one in system headers.
 281    We still document its existence though.  */
 282
 283 /*extern const char *strsignal (int);*/
 284
 285 /* Return the name of a signal number (e.g., strsigno (SIGHUP) returns
 286    "SIGHUP").  */
 287
 288 extern const char *strsigno (int);
 289
 290 /* Given the name of a signal, return its number.  */
 291
 292 extern int strtosigno (const char *);
 293
 294 /* Register a function to be run by xexit.  Returns 0 on success.  */
 295
 296 extern int xatexit (void (*fn) (void));
 297
 298 /* Exit, calling all the functions registered with xatexit.  */
 299
 300 extern void xexit (int status) ATTRIBUTE_NORETURN;
 301
 302 /* Set the program name used by xmalloc.  */
 303
 304 extern void xmalloc_set_program_name (const char *);
 305
 306 /* Report an allocation failure.  */
 307 extern void xmalloc_failed (size_t) ATTRIBUTE_NORETURN;
 308
 309 /* Allocate memory without fail.  If malloc fails, this will print a
 310    message to stderr (using the name set by xmalloc_set_program_name,
 311    if any) and then call xexit.  */
 312
 313 extern void *xmalloc (size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 314
 315 /* Reallocate memory without fail.  This works like xmalloc.  Note,
 316    realloc type functions are not suitable for attribute malloc since
 317    they may return the same address across multiple calls. */
 318
 319 extern void *xrealloc (void *, size_t) ATTRIBUTE_RETURNS_NONNULL;
 320
 321 /* Allocate memory without fail and set it to zero.  This works like
 322    xmalloc.  */
 323
 324 extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 325
 326 /* Copy a string into a memory buffer without fail.  */
 327
 328 extern char *xstrdup (const char *) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 329
 330 /* Copy at most N characters from string into a buffer without fail.  */
 331
 332 extern char *xstrndup (const char *, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 333
 334 /* Copy an existing memory buffer to a new memory buffer without fail.  */
 335
 336 extern void *xmemdup (const void *, size_t, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 337
 338 /* Physical memory routines.  Return values are in BYTES.  */
 339 extern double physmem_total (void);
 340 extern double physmem_available (void);
 341
 342 /* Compute the 32-bit CRC of a block of memory.  */
 343 extern unsigned int xcrc32 (const unsigned char *, int, unsigned int);
 344
 345 /* These macros provide a K&R/C89/C++-friendly way of allocating structures
 346    with nice encapsulation.  The XDELETE*() macros are technically
 347    superfluous, but provided here for symmetry.  Using them consistently
 348    makes it easier to update client code to use different allocators such
 349    as new/delete and new[]/delete[].  */
 350
 351 /* Scalar allocators.  */
 352
 353 #define XALLOCA(T)              ((T *) alloca (sizeof (T)))
 354 #define XNEW(T)                 ((T *) xmalloc (sizeof (T)))
 355 #define XCNEW(T)                ((T *) xcalloc (1, sizeof (T)))
 356 #define XDUP(T, P)              ((T *) xmemdup ((P), sizeof (T), sizeof (T)))
 357 #define XDELETE(P)              free ((void*) (P))
 358
 359 /* Array allocators.  */
 360
 361 #define XALLOCAVEC(T, N)        ((T *) alloca (sizeof (T) * (N)))
 362 #define XNEWVEC(T, N)           ((T *) xmalloc (sizeof (T) * (N)))
 363 #define XCNEWVEC(T, N)          ((T *) xcalloc ((N), sizeof (T)))
 364 #define XDUPVEC(T, P, N)        ((T *) xmemdup ((P), sizeof (T) * (N), sizeof (T) * (N)))
 365 #define XRESIZEVEC(T, P, N)     ((T *) xrealloc ((void *) (P), sizeof (T) * (N)))
 366 #define XDELETEVEC(P)           free ((void*) (P))
 367
 368 /* Allocators for variable-sized structures and raw buffers.  */
 369
 370 #define XALLOCAVAR(T, S)        ((T *) alloca ((S)))
 371 #define XNEWVAR(T, S)           ((T *) xmalloc ((S)))
 372 #define XCNEWVAR(T, S)          ((T *) xcalloc (1, (S)))
 373 #define XDUPVAR(T, P, S1, S2)   ((T *) xmemdup ((P), (S1), (S2)))
 374 #define XRESIZEVAR(T, P, S)     ((T *) xrealloc ((P), (S)))
 375
 376 /* Type-safe obstack allocator.  */
 377
 378 #define XOBNEW(O, T)            ((T *) obstack_alloc ((O), sizeof (T)))
 379 #define XOBNEWVEC(O, T, N)      ((T *) obstack_alloc ((O), sizeof (T) * (N)))
 380 #define XOBNEWVAR(O, T, S)      ((T *) obstack_alloc ((O), (S)))
 381 #define XOBFINISH(O, T)         ((T) obstack_finish ((O)))
 382
 383 /* hex character manipulation routines */
 384
 385 #define _hex_array_size 256
 386 #define _hex_bad        99
 387 extern const unsigned char _hex_value[_hex_array_size];
 388 extern void hex_init (void);
 389 #define hex_p(c)        (hex_value (c) != _hex_bad)
 390 /* If you change this, note well: Some code relies on side effects in
 391    the argument being performed exactly once.  */
 392 #define hex_value(c)    ((unsigned int) _hex_value[(unsigned char) (c)])
 393
 394 /* Flags for pex_init.  These are bits to be or'ed together.  */
 395
 396 /* Record subprocess times, if possible.  */
 397 #define PEX_RECORD_TIMES        0x1
 398
 399 /* Use pipes for communication between processes, if possible.  */
 400 #define PEX_USE_PIPES           0x2
 401
 402 /* Save files used for communication between processes.  */
 403 #define PEX_SAVE_TEMPS          0x4
 404
 405 /* Max number of alloca bytes per call before we must switch to malloc.
 406
 407    ?? Swiped from gnulib's regex_internal.h header.  Is this actually
 408    the case?  This number seems arbitrary, though sane.
 409
 410    The OS usually guarantees only one guard page at the bottom of the stack,
 411    and a page size can be as small as 4096 bytes.  So we cannot safely
 412    allocate anything larger than 4096 bytes.  Also care for the possibility
 413    of a few compiler-allocated temporary stack slots.  */
 414 #define MAX_ALLOCA_SIZE 4032
 415
 416 /* Prepare to execute one or more programs, with standard output of
 417    each program fed to standard input of the next.
 418    FLAGS        As above.
 419    PNAME        The name of the program to report in error messages.
 420    TEMPBASE     A base name to use for temporary files; may be NULL to
 421                 use a random name.
 422    Returns NULL on error.  */
 423
 424 extern struct pex_obj *pex_init (int flags, const char *pname,
 425                                  const char *tempbase) ATTRIBUTE_RETURNS_NONNULL;
 426
 427 /* Flags for pex_run.  These are bits to be or'ed together.  */
 428
 429 /* Last program in pipeline.  Standard output of program goes to
 430    OUTNAME, or, if OUTNAME is NULL, to standard output of caller.  Do
 431    not set this if you want to call pex_read_output.  After this is
 432    set, pex_run may no longer be called with the same struct
 433    pex_obj.  */
 434 #define PEX_LAST                0x1
 435
 436 /* Search for program in executable search path.  */
 437 #define PEX_SEARCH              0x2
 438
 439 /* OUTNAME is a suffix.  */
 440 #define PEX_SUFFIX              0x4
 441
 442 /* Send program's standard error to standard output.  */
 443 #define PEX_STDERR_TO_STDOUT    0x8
 444
 445 /* Input file should be opened in binary mode.  This flag is ignored
 446    on Unix.  */
 447 #define PEX_BINARY_INPUT        0x10
 448
 449 /* Output file should be opened in binary mode.  This flag is ignored
 450    on Unix.  For proper behaviour PEX_BINARY_INPUT and
 451    PEX_BINARY_OUTPUT have to match appropriately--i.e., a call using
 452    PEX_BINARY_OUTPUT should be followed by a call using
 453    PEX_BINARY_INPUT.  */
 454 #define PEX_BINARY_OUTPUT       0x20
 455
 456 /* Capture stderr to a pipe.  The output can be read by
 457    calling pex_read_err and reading from the returned
 458    FILE object.  This flag may be specified only for
 459    the last program in a pipeline.
 460
 461    This flag is supported only on Unix and Windows.  */
 462 #define PEX_STDERR_TO_PIPE      0x40
 463
 464 /* Capture stderr in binary mode.  This flag is ignored
 465    on Unix.  */
 466 #define PEX_BINARY_ERROR        0x80
 467
 468 /* Append stdout to existing file instead of truncating it.  */
 469 #define PEX_STDOUT_APPEND       0x100
 470
 471 /* Thes same as PEX_STDOUT_APPEND, but for STDERR.  */
 472 #define PEX_STDERR_APPEND       0x200
 473
 474 /* Execute one program.  Returns NULL on success.  On error returns an
 475    error string (typically just the name of a system call); the error
 476    string is statically allocated.
 477
 478    OBJ          Returned by pex_init.
 479
 480    FLAGS        As above.
 481
 482    EXECUTABLE   The program to execute.
 483
 484    ARGV         NULL terminated array of arguments to pass to the program.
 485
 486    OUTNAME      Sets the output file name as follows:
 487
 488                 PEX_SUFFIX set (OUTNAME may not be NULL):
 489                   TEMPBASE parameter to pex_init not NULL:
 490                     Output file name is the concatenation of TEMPBASE
 491                     and OUTNAME.
 492                   TEMPBASE is NULL:
 493                     Output file name is a random file name ending in
 494                     OUTNAME.
 495                 PEX_SUFFIX not set:
 496                   OUTNAME not NULL:
 497                     Output file name is OUTNAME.
 498                   OUTNAME NULL, TEMPBASE not NULL:
 499                     Output file name is randomly chosen using
 500                     TEMPBASE.
 501                   OUTNAME NULL, TEMPBASE NULL:
 502                     Output file name is randomly chosen.
 503
 504                 If PEX_LAST is not set, the output file name is the
 505                 name to use for a temporary file holding stdout, if
 506                 any (there will not be a file if PEX_USE_PIPES is set
 507                 and the system supports pipes).  If a file is used, it
 508                 will be removed when no longer needed unless
 509                 PEX_SAVE_TEMPS is set.
 510
 511                 If PEX_LAST is set, and OUTNAME is not NULL, standard
 512                 output is written to the output file name.  The file
 513                 will not be removed.  If PEX_LAST and PEX_SUFFIX are
 514                 both set, TEMPBASE may not be NULL.
 515
 516    ERRNAME      If not NULL, this is the name of a file to which
 517                 standard error is written.  If NULL, standard error of
 518                 the program is standard error of the caller.
 519
 520    ERR          On an error return, *ERR is set to an errno value, or
 521                 to 0 if there is no relevant errno.
 522 */
 523
 524 extern const char *pex_run (struct pex_obj *obj, int flags,
 525                             const char *executable, char * const *argv,
 526                             const char *outname, const char *errname,
 527                             int *err);
 528
 529 /* As for pex_run (), but takes an extra parameter to enable the
 530    environment for the child process to be specified.
 531
 532    ENV          The environment for the child process, specified as
 533                 an array of character pointers.  Each element of the
 534                 array should point to a string of the form VAR=VALUE,
 535                 with the exception of the last element which must be
 536                 a null pointer.
 537 */
 538
 539 extern const char *pex_run_in_environment (struct pex_obj *obj, int flags,
 540                                            const char *executable,
 541                                            char * const *argv,
 542                                            char * const *env,
 543                                            const char *outname,
 544                                            const char *errname, int *err);
 545
 546 /* Return a stream for a temporary file to pass to the first program
 547    in the pipeline as input.  The file name is chosen as for pex_run.
 548    pex_run closes the file automatically; don't close it yourself.  */
 549
 550 extern FILE *pex_input_file (struct pex_obj *obj, int flags,
 551                              const char *in_name);
 552
 553 /* Return a stream for a pipe connected to the standard input of the
 554    first program in the pipeline.  You must have passed
 555    `PEX_USE_PIPES' to `pex_init'.  Close the returned stream
 556    yourself.  */
 557
 558 extern FILE *pex_input_pipe (struct pex_obj *obj, int binary);
 559
 560 /* Read the standard output of the last program to be executed.
 561    pex_run can not be called after this.  BINARY should be non-zero if
 562    the file should be opened in binary mode; this is ignored on Unix.
 563    Returns NULL on error.  Don't call fclose on the returned FILE; it
 564    will be closed by pex_free.  */
 565
 566 extern FILE *pex_read_output (struct pex_obj *, int binary);
 567
 568 /* Read the standard error of the last program to be executed.
 569    pex_run can not be called after this.  BINARY should be non-zero if
 570    the file should be opened in binary mode; this is ignored on Unix.
 571    Returns NULL on error.  Don't call fclose on the returned FILE; it
 572    will be closed by pex_free.  */
 573
 574 extern FILE *pex_read_err (struct pex_obj *, int binary);
 575
 576 /* Return exit status of all programs in VECTOR.  COUNT indicates the
 577    size of VECTOR.  The status codes in the vector are in the order of
 578    the calls to pex_run.  Returns 0 on error, 1 on success.  */
 579
 580 extern int pex_get_status (struct pex_obj *, int count, int *vector);
 581
 582 /* Return times of all programs in VECTOR.  COUNT indicates the size
 583    of VECTOR.  struct pex_time is really just struct timeval, but that
 584    is not portable to all systems.  Returns 0 on error, 1 on
 585    success.  */
 586
 587 struct pex_time
 588 {
 589   unsigned long user_seconds;
 590   unsigned long user_microseconds;
 591   unsigned long system_seconds;
 592   unsigned long system_microseconds;
 593 };
 594
 595 extern int pex_get_times (struct pex_obj *, int count,
 596                           struct pex_time *vector);
 597
 598 /* Clean up a pex_obj.  If you have not called pex_get_times or
 599    pex_get_status, this will try to kill the subprocesses.  */
 600
 601 extern void pex_free (struct pex_obj *);
 602
 603 /* Just execute one program.  Return value is as for pex_run.
 604    FLAGS        Combination of PEX_SEARCH and PEX_STDERR_TO_STDOUT.
 605    EXECUTABLE   As for pex_run.
 606    ARGV         As for pex_run.
 607    PNAME        As for pex_init.
 608    OUTNAME      As for pex_run when PEX_LAST is set.
 609    ERRNAME      As for pex_run.
 610    STATUS       Set to exit status on success.
 611    ERR          As for pex_run.
 612 */
 613
 614 extern const char *pex_one (int flags, const char *executable,
 615                             char * const *argv, const char *pname,
 616                             const char *outname, const char *errname,
 617                             int *status, int *err);
 618
 619 /* pexecute and pwait are the old pexecute interface, still here for
 620    backward compatibility.  Don't use these for new code.  Instead,
 621    use pex_init/pex_run/pex_get_status/pex_free, or pex_one.  */
 622
 623 /* Definitions used by the pexecute routine.  */
 624
 625 #define PEXECUTE_FIRST   1
 626 #define PEXECUTE_LAST    2
 627 #define PEXECUTE_ONE     (PEXECUTE_FIRST + PEXECUTE_LAST)
 628 #define PEXECUTE_SEARCH  4
 629 #define PEXECUTE_VERBOSE 8
 630
 631 /* Execute a program.  */
 632
 633 extern int pexecute (const char *, char * const *, const char *,
 634                      const char *, char **, char **, int);
 635
 636 /* Wait for pexecute to finish.  */
 637
 638 extern int pwait (int, int *, int);
 639
 640 #if defined(HAVE_DECL_ASPRINTF) && !HAVE_DECL_ASPRINTF
 641 /* Like sprintf but provides a pointer to malloc'd storage, which must
 642    be freed by the caller.  */
 643
 644 extern int asprintf (char **, const char *, ...) ATTRIBUTE_PRINTF_2;
 645 #endif
 646
 647 /* Like asprintf but allocates memory without fail. This works like
 648    xmalloc.  */
 649
 650 extern char *xasprintf (const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_PRINTF_1;
 651
 652 #if !HAVE_DECL_VASPRINTF
 653 /* Like vsprintf but provides a pointer to malloc'd storage, which
 654    must be freed by the caller.  */
 655
 656 extern int vasprintf (char **, const char *, va_list) ATTRIBUTE_PRINTF(2,0);
 657 #endif
 658
 659 /* Like vasprintf but allocates memory without fail. This works like
 660    xmalloc.  */
 661
 662 extern char *xvasprintf (const char *, va_list) ATTRIBUTE_MALLOC ATTRIBUTE_PRINTF(1,0);
 663
 664 #if defined(HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
 665 /* Like sprintf but prints at most N characters.  */
 666 extern int snprintf (char *, size_t, const char *, ...) ATTRIBUTE_PRINTF_3;
 667 #endif
 668
 669 #if defined(HAVE_DECL_VSNPRINTF) && !HAVE_DECL_VSNPRINTF
 670 /* Like vsprintf but prints at most N characters.  */
 671 extern int vsnprintf (char *, size_t, const char *, va_list) ATTRIBUTE_PRINTF(3,0);
 672 #endif
 673
 674 #if defined (HAVE_DECL_STRNLEN) && !HAVE_DECL_STRNLEN
 675 extern size_t strnlen (const char *, size_t);
 676 #endif
 677
 678 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 679 /* Compare version strings.  */
 680 extern int strverscmp (const char *, const char *);
 681 #endif
 682
 683 #if defined(HAVE_DECL_STRTOL) && !HAVE_DECL_STRTOL
 684 extern long int strtol (const char *nptr,
 685                         char **endptr, int base);
 686 #endif
 687
 688 #if defined(HAVE_DECL_STRTOUL) && !HAVE_DECL_STRTOUL
 689 extern unsigned long int strtoul (const char *nptr,
 690                                   char **endptr, int base);
 691 #endif
 692
 693 #if defined(HAVE_LONG_LONG) && defined(HAVE_DECL_STRTOLL) && !HAVE_DECL_STRTOLL
 694 __extension__
 695 extern long long int strtoll (const char *nptr,
 696                               char **endptr, int base);
 697 #endif
 698
 699 #if defined(HAVE_LONG_LONG) && defined(HAVE_DECL_STRTOULL) && !HAVE_DECL_STRTOULL
 700 __extension__
 701 extern unsigned long long int strtoull (const char *nptr,
 702                                         char **endptr, int base);
 703 #endif
 704
 705 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 706 /* Compare version strings.  */
 707 extern int strverscmp (const char *, const char *);
 708 #endif
 709
 710 /* Set the title of a process */
 711 extern void setproctitle (const char *name, ...);
 712
 713 /* Increase stack limit if possible.  */
 714 extern void stack_limit_increase (unsigned long);
 715
 716 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 717
 718 /* Drastically simplified alloca configurator.  If we're using GCC,
 719    we use __builtin_alloca; otherwise we use the C alloca.  The C
 720    alloca is always available.  You can override GCC by defining
 721    USE_C_ALLOCA yourself.  The canonical autoconf macro C_ALLOCA is
 722    also set/unset as it is often used to indicate whether code needs
 723    to call alloca(0).  */
 724 extern void *C_alloca (size_t) ATTRIBUTE_MALLOC;
 725 #undef alloca
 726 #if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
 727 # define alloca(x) __builtin_alloca(x)
 728 # undef C_ALLOCA
 729 # define ASTRDUP(X) \
 730   (__extension__ ({ const char *const libiberty_optr = (X); \
 731    const unsigned long libiberty_len = strlen (libiberty_optr) + 1; \
 732    char *const libiberty_nptr = (char *) alloca (libiberty_len); \
 733    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len); }))
 734 #else
 735 # define alloca(x) C_alloca(x)
 736 # undef USE_C_ALLOCA
 737 # define USE_C_ALLOCA 1
 738 # undef C_ALLOCA
 739 # define C_ALLOCA 1
 740 extern const char *libiberty_optr;
 741 extern char *libiberty_nptr;
 742 extern unsigned long libiberty_len;
 743 # define ASTRDUP(X) \
 744   (libiberty_optr = (X), \
 745    libiberty_len = strlen (libiberty_optr) + 1, \
 746    libiberty_nptr = (char *) alloca (libiberty_len), \
 747    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len))
 748 #endif
 749
 750 #ifdef __cplusplus
 751 }
 752 #endif
 753
 754
 755 #endif /* ! defined (LIBIBERTY_H) */