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 /* Remove a link to a file unless it is special. */
 243
 244 extern int unlink_if_ordinary (const char *);
 245
 246 /* Allocate memory filled with spaces.  Allocates using malloc.  */
 247
 248 extern const char *spaces (int count);
 249
 250 /* Return the maximum error number for which strerror will return a
 251    string.  */
 252
 253 extern int errno_max (void);
 254
 255 /* Return the name of an errno value (e.g., strerrno (EINVAL) returns
 256    "EINVAL").  */
 257
 258 extern const char *strerrno (int);
 259
 260 /* Given the name of an errno value, return the value.  */
 261
 262 extern int strtoerrno (const char *);
 263
 264 /* ANSI's strerror(), but more robust.  */
 265
 266 extern char *xstrerror (int) ATTRIBUTE_RETURNS_NONNULL;
 267
 268 /* Return the maximum signal number for which strsignal will return a
 269    string.  */
 270
 271 extern int signo_max (void);
 272
 273 /* Return a signal message string for a signal number
 274    (e.g., strsignal (SIGHUP) returns something like "Hangup").  */
 275 /* This is commented out as it can conflict with one in system headers.
 276    We still document its existence though.  */
 277
 278 /*extern const char *strsignal (int);*/
 279
 280 /* Return the name of a signal number (e.g., strsigno (SIGHUP) returns
 281    "SIGHUP").  */
 282
 283 extern const char *strsigno (int);
 284
 285 /* Given the name of a signal, return its number.  */
 286
 287 extern int strtosigno (const char *);
 288
 289 /* Register a function to be run by xexit.  Returns 0 on success.  */
 290
 291 extern int xatexit (void (*fn) (void));
 292
 293 /* Exit, calling all the functions registered with xatexit.  */
 294
 295 extern void xexit (int status) ATTRIBUTE_NORETURN;
 296
 297 /* Set the program name used by xmalloc.  */
 298
 299 extern void xmalloc_set_program_name (const char *);
 300
 301 /* Report an allocation failure.  */
 302 extern void xmalloc_failed (size_t) ATTRIBUTE_NORETURN;
 303
 304 /* Allocate memory without fail.  If malloc fails, this will print a
 305    message to stderr (using the name set by xmalloc_set_program_name,
 306    if any) and then call xexit.  */
 307
 308 extern void *xmalloc (size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 309
 310 /* Reallocate memory without fail.  This works like xmalloc.  Note,
 311    realloc type functions are not suitable for attribute malloc since
 312    they may return the same address across multiple calls. */
 313
 314 extern void *xrealloc (void *, size_t) ATTRIBUTE_RETURNS_NONNULL;
 315
 316 /* Allocate memory without fail and set it to zero.  This works like
 317    xmalloc.  */
 318
 319 extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 320
 321 /* Copy a string into a memory buffer without fail.  */
 322
 323 extern char *xstrdup (const char *) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 324
 325 /* Copy at most N characters from string into a buffer without fail.  */
 326
 327 extern char *xstrndup (const char *, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 328
 329 /* Copy an existing memory buffer to a new memory buffer without fail.  */
 330
 331 extern void *xmemdup (const void *, size_t, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
 332
 333 /* Physical memory routines.  Return values are in BYTES.  */
 334 extern double physmem_total (void);
 335 extern double physmem_available (void);
 336
 337 /* Compute the 32-bit CRC of a block of memory.  */
 338 extern unsigned int xcrc32 (const unsigned char *, int, unsigned int);
 339
 340 /* These macros provide a K&R/C89/C++-friendly way of allocating structures
 341    with nice encapsulation.  The XDELETE*() macros are technically
 342    superfluous, but provided here for symmetry.  Using them consistently
 343    makes it easier to update client code to use different allocators such
 344    as new/delete and new[]/delete[].  */
 345
 346 /* Scalar allocators.  */
 347
 348 #define XALLOCA(T)              ((T *) alloca (sizeof (T)))
 349 #define XNEW(T)                 ((T *) xmalloc (sizeof (T)))
 350 #define XCNEW(T)                ((T *) xcalloc (1, sizeof (T)))
 351 #define XDUP(T, P)              ((T *) xmemdup ((P), sizeof (T), sizeof (T)))
 352 #define XDELETE(P)              free ((void*) (P))
 353
 354 /* Array allocators.  */
 355
 356 #define XALLOCAVEC(T, N)        ((T *) alloca (sizeof (T) * (N)))
 357 #define XNEWVEC(T, N)           ((T *) xmalloc (sizeof (T) * (N)))
 358 #define XCNEWVEC(T, N)          ((T *) xcalloc ((N), sizeof (T)))
 359 #define XDUPVEC(T, P, N)        ((T *) xmemdup ((P), sizeof (T) * (N), sizeof (T) * (N)))
 360 #define XRESIZEVEC(T, P, N)     ((T *) xrealloc ((void *) (P), sizeof (T) * (N)))
 361 #define XDELETEVEC(P)           free ((void*) (P))
 362
 363 /* Allocators for variable-sized structures and raw buffers.  */
 364
 365 #define XALLOCAVAR(T, S)        ((T *) alloca ((S)))
 366 #define XNEWVAR(T, S)           ((T *) xmalloc ((S)))
 367 #define XCNEWVAR(T, S)          ((T *) xcalloc (1, (S)))
 368 #define XDUPVAR(T, P, S1, S2)   ((T *) xmemdup ((P), (S1), (S2)))
 369 #define XRESIZEVAR(T, P, S)     ((T *) xrealloc ((P), (S)))
 370
 371 /* Type-safe obstack allocator.  */
 372
 373 #define XOBNEW(O, T)            ((T *) obstack_alloc ((O), sizeof (T)))
 374 #define XOBNEWVEC(O, T, N)      ((T *) obstack_alloc ((O), sizeof (T) * (N)))
 375 #define XOBNEWVAR(O, T, S)      ((T *) obstack_alloc ((O), (S)))
 376 #define XOBFINISH(O, T)         ((T) obstack_finish ((O)))
 377
 378 /* hex character manipulation routines */
 379
 380 #define _hex_array_size 256
 381 #define _hex_bad        99
 382 extern const unsigned char _hex_value[_hex_array_size];
 383 extern void hex_init (void);
 384 #define hex_p(c)        (hex_value (c) != _hex_bad)
 385 /* If you change this, note well: Some code relies on side effects in
 386    the argument being performed exactly once.  */
 387 #define hex_value(c)    ((unsigned int) _hex_value[(unsigned char) (c)])
 388
 389 /* Flags for pex_init.  These are bits to be or'ed together.  */
 390
 391 /* Record subprocess times, if possible.  */
 392 #define PEX_RECORD_TIMES        0x1
 393
 394 /* Use pipes for communication between processes, if possible.  */
 395 #define PEX_USE_PIPES           0x2
 396
 397 /* Save files used for communication between processes.  */
 398 #define PEX_SAVE_TEMPS          0x4
 399
 400 /* Max number of alloca bytes per call before we must switch to malloc.
 401
 402    ?? Swiped from gnulib's regex_internal.h header.  Is this actually
 403    the case?  This number seems arbitrary, though sane.
 404
 405    The OS usually guarantees only one guard page at the bottom of the stack,
 406    and a page size can be as small as 4096 bytes.  So we cannot safely
 407    allocate anything larger than 4096 bytes.  Also care for the possibility
 408    of a few compiler-allocated temporary stack slots.  */
 409 #define MAX_ALLOCA_SIZE 4032
 410
 411 /* Prepare to execute one or more programs, with standard output of
 412    each program fed to standard input of the next.
 413    FLAGS        As above.
 414    PNAME        The name of the program to report in error messages.
 415    TEMPBASE     A base name to use for temporary files; may be NULL to
 416                 use a random name.
 417    Returns NULL on error.  */
 418
 419 extern struct pex_obj *pex_init (int flags, const char *pname,
 420                                  const char *tempbase) ATTRIBUTE_RETURNS_NONNULL;
 421
 422 /* Flags for pex_run.  These are bits to be or'ed together.  */
 423
 424 /* Last program in pipeline.  Standard output of program goes to
 425    OUTNAME, or, if OUTNAME is NULL, to standard output of caller.  Do
 426    not set this if you want to call pex_read_output.  After this is
 427    set, pex_run may no longer be called with the same struct
 428    pex_obj.  */
 429 #define PEX_LAST                0x1
 430
 431 /* Search for program in executable search path.  */
 432 #define PEX_SEARCH              0x2
 433
 434 /* OUTNAME is a suffix.  */
 435 #define PEX_SUFFIX              0x4
 436
 437 /* Send program's standard error to standard output.  */
 438 #define PEX_STDERR_TO_STDOUT    0x8
 439
 440 /* Input file should be opened in binary mode.  This flag is ignored
 441    on Unix.  */
 442 #define PEX_BINARY_INPUT        0x10
 443
 444 /* Output file should be opened in binary mode.  This flag is ignored
 445    on Unix.  For proper behaviour PEX_BINARY_INPUT and
 446    PEX_BINARY_OUTPUT have to match appropriately--i.e., a call using
 447    PEX_BINARY_OUTPUT should be followed by a call using
 448    PEX_BINARY_INPUT.  */
 449 #define PEX_BINARY_OUTPUT       0x20
 450
 451 /* Capture stderr to a pipe.  The output can be read by
 452    calling pex_read_err and reading from the returned
 453    FILE object.  This flag may be specified only for
 454    the last program in a pipeline.
 455
 456    This flag is supported only on Unix and Windows.  */
 457 #define PEX_STDERR_TO_PIPE      0x40
 458
 459 /* Capture stderr in binary mode.  This flag is ignored
 460    on Unix.  */
 461 #define PEX_BINARY_ERROR        0x80
 462
 463 /* Append stdout to existing file instead of truncating it.  */
 464 #define PEX_STDOUT_APPEND       0x100
 465
 466 /* Thes same as PEX_STDOUT_APPEND, but for STDERR.  */
 467 #define PEX_STDERR_APPEND       0x200
 468
 469 /* Execute one program.  Returns NULL on success.  On error returns an
 470    error string (typically just the name of a system call); the error
 471    string is statically allocated.
 472
 473    OBJ          Returned by pex_init.
 474
 475    FLAGS        As above.
 476
 477    EXECUTABLE   The program to execute.
 478
 479    ARGV         NULL terminated array of arguments to pass to the program.
 480
 481    OUTNAME      Sets the output file name as follows:
 482
 483                 PEX_SUFFIX set (OUTNAME may not be NULL):
 484                   TEMPBASE parameter to pex_init not NULL:
 485                     Output file name is the concatenation of TEMPBASE
 486                     and OUTNAME.
 487                   TEMPBASE is NULL:
 488                     Output file name is a random file name ending in
 489                     OUTNAME.
 490                 PEX_SUFFIX not set:
 491                   OUTNAME not NULL:
 492                     Output file name is OUTNAME.
 493                   OUTNAME NULL, TEMPBASE not NULL:
 494                     Output file name is randomly chosen using
 495                     TEMPBASE.
 496                   OUTNAME NULL, TEMPBASE NULL:
 497                     Output file name is randomly chosen.
 498
 499                 If PEX_LAST is not set, the output file name is the
 500                 name to use for a temporary file holding stdout, if
 501                 any (there will not be a file if PEX_USE_PIPES is set
 502                 and the system supports pipes).  If a file is used, it
 503                 will be removed when no longer needed unless
 504                 PEX_SAVE_TEMPS is set.
 505
 506                 If PEX_LAST is set, and OUTNAME is not NULL, standard
 507                 output is written to the output file name.  The file
 508                 will not be removed.  If PEX_LAST and PEX_SUFFIX are
 509                 both set, TEMPBASE may not be NULL.
 510
 511    ERRNAME      If not NULL, this is the name of a file to which
 512                 standard error is written.  If NULL, standard error of
 513                 the program is standard error of the caller.
 514
 515    ERR          On an error return, *ERR is set to an errno value, or
 516                 to 0 if there is no relevant errno.
 517 */
 518
 519 extern const char *pex_run (struct pex_obj *obj, int flags,
 520                             const char *executable, char * const *argv,
 521                             const char *outname, const char *errname,
 522                             int *err);
 523
 524 /* As for pex_run (), but takes an extra parameter to enable the
 525    environment for the child process to be specified.
 526
 527    ENV          The environment for the child process, specified as
 528                 an array of character pointers.  Each element of the
 529                 array should point to a string of the form VAR=VALUE,
 530                 with the exception of the last element which must be
 531                 a null pointer.
 532 */
 533
 534 extern const char *pex_run_in_environment (struct pex_obj *obj, int flags,
 535                                            const char *executable,
 536                                            char * const *argv,
 537                                            char * const *env,
 538                                            const char *outname,
 539                                            const char *errname, int *err);
 540
 541 /* Return a stream for a temporary file to pass to the first program
 542    in the pipeline as input.  The file name is chosen as for pex_run.
 543    pex_run closes the file automatically; don't close it yourself.  */
 544
 545 extern FILE *pex_input_file (struct pex_obj *obj, int flags,
 546                              const char *in_name);
 547
 548 /* Return a stream for a pipe connected to the standard input of the
 549    first program in the pipeline.  You must have passed
 550    `PEX_USE_PIPES' to `pex_init'.  Close the returned stream
 551    yourself.  */
 552
 553 extern FILE *pex_input_pipe (struct pex_obj *obj, int binary);
 554
 555 /* Read the standard output of the last program to be executed.
 556    pex_run can not be called after this.  BINARY should be non-zero if
 557    the file should be opened in binary mode; this is ignored on Unix.
 558    Returns NULL on error.  Don't call fclose on the returned FILE; it
 559    will be closed by pex_free.  */
 560
 561 extern FILE *pex_read_output (struct pex_obj *, int binary);
 562
 563 /* Read the standard error of the last program to be executed.
 564    pex_run can not be called after this.  BINARY should be non-zero if
 565    the file should be opened in binary mode; this is ignored on Unix.
 566    Returns NULL on error.  Don't call fclose on the returned FILE; it
 567    will be closed by pex_free.  */
 568
 569 extern FILE *pex_read_err (struct pex_obj *, int binary);
 570
 571 /* Return exit status of all programs in VECTOR.  COUNT indicates the
 572    size of VECTOR.  The status codes in the vector are in the order of
 573    the calls to pex_run.  Returns 0 on error, 1 on success.  */
 574
 575 extern int pex_get_status (struct pex_obj *, int count, int *vector);
 576
 577 /* Return times of all programs in VECTOR.  COUNT indicates the size
 578    of VECTOR.  struct pex_time is really just struct timeval, but that
 579    is not portable to all systems.  Returns 0 on error, 1 on
 580    success.  */
 581
 582 struct pex_time
 583 {
 584   unsigned long user_seconds;
 585   unsigned long user_microseconds;
 586   unsigned long system_seconds;
 587   unsigned long system_microseconds;
 588 };
 589
 590 extern int pex_get_times (struct pex_obj *, int count,
 591                           struct pex_time *vector);
 592
 593 /* Clean up a pex_obj.  If you have not called pex_get_times or
 594    pex_get_status, this will try to kill the subprocesses.  */
 595
 596 extern void pex_free (struct pex_obj *);
 597
 598 /* Just execute one program.  Return value is as for pex_run.
 599    FLAGS        Combination of PEX_SEARCH and PEX_STDERR_TO_STDOUT.
 600    EXECUTABLE   As for pex_run.
 601    ARGV         As for pex_run.
 602    PNAME        As for pex_init.
 603    OUTNAME      As for pex_run when PEX_LAST is set.
 604    ERRNAME      As for pex_run.
 605    STATUS       Set to exit status on success.
 606    ERR          As for pex_run.
 607 */
 608
 609 extern const char *pex_one (int flags, const char *executable,
 610                             char * const *argv, const char *pname,
 611                             const char *outname, const char *errname,
 612                             int *status, int *err);
 613
 614 /* pexecute and pwait are the old pexecute interface, still here for
 615    backward compatibility.  Don't use these for new code.  Instead,
 616    use pex_init/pex_run/pex_get_status/pex_free, or pex_one.  */
 617
 618 /* Definitions used by the pexecute routine.  */
 619
 620 #define PEXECUTE_FIRST   1
 621 #define PEXECUTE_LAST    2
 622 #define PEXECUTE_ONE     (PEXECUTE_FIRST + PEXECUTE_LAST)
 623 #define PEXECUTE_SEARCH  4
 624 #define PEXECUTE_VERBOSE 8
 625
 626 /* Execute a program.  */
 627
 628 extern int pexecute (const char *, char * const *, const char *,
 629                      const char *, char **, char **, int);
 630
 631 /* Wait for pexecute to finish.  */
 632
 633 extern int pwait (int, int *, int);
 634
 635 #if defined(HAVE_DECL_ASPRINTF) && !HAVE_DECL_ASPRINTF
 636 /* Like sprintf but provides a pointer to malloc'd storage, which must
 637    be freed by the caller.  */
 638
 639 extern int asprintf (char **, const char *, ...) ATTRIBUTE_PRINTF_2;
 640 #endif
 641
 642 /* Like asprintf but allocates memory without fail. This works like
 643    xmalloc.  */
 644
 645 extern char *xasprintf (const char *, ...) ATTRIBUTE_MALLOC ATTRIBUTE_PRINTF_1;
 646
 647 #if !HAVE_DECL_VASPRINTF
 648 /* Like vsprintf but provides a pointer to malloc'd storage, which
 649    must be freed by the caller.  */
 650
 651 extern int vasprintf (char **, const char *, va_list) ATTRIBUTE_PRINTF(2,0);
 652 #endif
 653
 654 /* Like vasprintf but allocates memory without fail. This works like
 655    xmalloc.  */
 656
 657 extern char *xvasprintf (const char *, va_list) ATTRIBUTE_MALLOC ATTRIBUTE_PRINTF(1,0);
 658
 659 #if defined(HAVE_DECL_SNPRINTF) && !HAVE_DECL_SNPRINTF
 660 /* Like sprintf but prints at most N characters.  */
 661 extern int snprintf (char *, size_t, const char *, ...) ATTRIBUTE_PRINTF_3;
 662 #endif
 663
 664 #if defined(HAVE_DECL_VSNPRINTF) && !HAVE_DECL_VSNPRINTF
 665 /* Like vsprintf but prints at most N characters.  */
 666 extern int vsnprintf (char *, size_t, const char *, va_list) ATTRIBUTE_PRINTF(3,0);
 667 #endif
 668
 669 #if defined (HAVE_DECL_STRNLEN) && !HAVE_DECL_STRNLEN
 670 extern size_t strnlen (const char *, size_t);
 671 #endif
 672
 673 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 674 /* Compare version strings.  */
 675 extern int strverscmp (const char *, const char *);
 676 #endif
 677
 678 #if defined(HAVE_DECL_STRTOL) && !HAVE_DECL_STRTOL
 679 extern long int strtol (const char *nptr,
 680                         char **endptr, int base);
 681 #endif
 682
 683 #if defined(HAVE_DECL_STRTOUL) && !HAVE_DECL_STRTOUL
 684 extern unsigned long int strtoul (const char *nptr,
 685                                   char **endptr, int base);
 686 #endif
 687
 688 #if defined(HAVE_LONG_LONG) && defined(HAVE_DECL_STRTOLL) && !HAVE_DECL_STRTOLL
 689 __extension__
 690 extern long long int strtoll (const char *nptr,
 691                               char **endptr, int base);
 692 #endif
 693
 694 #if defined(HAVE_LONG_LONG) && defined(HAVE_DECL_STRTOULL) && !HAVE_DECL_STRTOULL
 695 __extension__
 696 extern unsigned long long int strtoull (const char *nptr,
 697                                         char **endptr, int base);
 698 #endif
 699
 700 #if defined(HAVE_DECL_STRVERSCMP) && !HAVE_DECL_STRVERSCMP
 701 /* Compare version strings.  */
 702 extern int strverscmp (const char *, const char *);
 703 #endif
 704
 705 /* Set the title of a process */
 706 extern void setproctitle (const char *name, ...);
 707
 708 /* Increase stack limit if possible.  */
 709 extern void stack_limit_increase (unsigned long);
 710
 711 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 712
 713 /* Drastically simplified alloca configurator.  If we're using GCC,
 714    we use __builtin_alloca; otherwise we use the C alloca.  The C
 715    alloca is always available.  You can override GCC by defining
 716    USE_C_ALLOCA yourself.  The canonical autoconf macro C_ALLOCA is
 717    also set/unset as it is often used to indicate whether code needs
 718    to call alloca(0).  */
 719 extern void *C_alloca (size_t) ATTRIBUTE_MALLOC;
 720 #undef alloca
 721 #if GCC_VERSION >= 2000 && !defined USE_C_ALLOCA
 722 # define alloca(x) __builtin_alloca(x)
 723 # undef C_ALLOCA
 724 # define ASTRDUP(X) \
 725   (__extension__ ({ const char *const libiberty_optr = (X); \
 726    const unsigned long libiberty_len = strlen (libiberty_optr) + 1; \
 727    char *const libiberty_nptr = (char *) alloca (libiberty_len); \
 728    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len); }))
 729 #else
 730 # define alloca(x) C_alloca(x)
 731 # undef USE_C_ALLOCA
 732 # define USE_C_ALLOCA 1
 733 # undef C_ALLOCA
 734 # define C_ALLOCA 1
 735 extern const char *libiberty_optr;
 736 extern char *libiberty_nptr;
 737 extern unsigned long libiberty_len;
 738 # define ASTRDUP(X) \
 739   (libiberty_optr = (X), \
 740    libiberty_len = strlen (libiberty_optr) + 1, \
 741    libiberty_nptr = (char *) alloca (libiberty_len), \
 742    (char *) memcpy (libiberty_nptr, libiberty_optr, libiberty_len))
 743 #endif
 744
 745 #ifdef __cplusplus
 746 }
 747 #endif
 748
 749
 750 #endif /* ! defined (LIBIBERTY_H) */