make.h

   1 /* Miscellaneous global declarations and portability cruft for GNU Make.
   2 Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
   3 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
   4 Foundation, Inc.
   5 This file is part of GNU Make.
   6
   7 GNU Make is free software; you can redistribute it and/or modify it under the
   8 terms of the GNU General Public License as published by the Free Software
   9 Foundation; either version 2, or (at your option) any later version.
  10
  11 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  13 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License along with
  16 GNU Make; see the file COPYING.  If not, write to the Free Software
  17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.  */
  18
  19 /* We use <config.h> instead of "config.h" so that a compilation
  20    using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
  21    (which it would do because make.h was found in $srcdir).  */
  22 #include <config.h>
  23 #undef  HAVE_CONFIG_H
  24 #define HAVE_CONFIG_H 1
  25
  26 /* AIX requires this to be the first thing in the file.  */
  27 #ifndef __GNUC__
  28 # if HAVE_ALLOCA_H
  29 #  include <alloca.h>
  30 # else
  31 #  ifdef _AIX
  32  #pragma alloca
  33 #  else
  34 #   ifndef alloca /* predefined by HP cc +Olibcalls */
  35 char *alloca ();
  36 #   endif
  37 #  endif
  38 # endif
  39 #endif
  40
  41
  42 /* Use prototypes if available.  */
  43 #if defined (__cplusplus) || defined (__STDC__)
  44 # undef  PARAMS
  45 # define PARAMS(protos)  protos
  46 #else /* Not C++ or ANSI C.  */
  47 # undef  PARAMS
  48 # define PARAMS(protos)  ()
  49 #endif /* C++ or ANSI C.  */
  50
  51 /* Specify we want GNU source code.  This must be defined before any
  52    system headers are included.  */
  53
  54 #define _GNU_SOURCE 1
  55
  56
  57 #ifdef  CRAY
  58 /* This must happen before #include <signal.h> so
  59    that the declaration therein is changed.  */
  60 # define signal bsdsignal
  61 #endif
  62
  63 /* If we're compiling for the dmalloc debugger, turn off string inlining.  */
  64 #if defined(HAVE_DMALLOC_H) && defined(__GNUC__)
  65 # define __NO_STRING_INLINES
  66 #endif
  67
  68 #include <sys/types.h>
  69 #include <sys/stat.h>
  70 #include <signal.h>
  71 #include <stdio.h>
  72 #include <ctype.h>
  73 #ifdef HAVE_SYS_TIMEB_H
  74 /* SCO 3.2 "devsys 4.2" has a prototype for `ftime' in <time.h> that bombs
  75    unless <sys/timeb.h> has been included first.  Does every system have a
  76    <sys/timeb.h>?  If any does not, configure should check for it.  */
  77 # include <sys/timeb.h>
  78 #endif
  79
  80 #if TIME_WITH_SYS_TIME
  81 # include <sys/time.h>
  82 # include <time.h>
  83 #else
  84 # if HAVE_SYS_TIME_H
  85 #  include <sys/time.h>
  86 # else
  87 #  include <time.h>
  88 # endif
  89 #endif
  90
  91 #include <errno.h>
  92
  93 #ifndef errno
  94 extern int errno;
  95 #endif
  96
  97 #ifndef isblank
  98 # define isblank(c)     ((c) == ' ' || (c) == '\t')
  99 #endif
 100
 101 #ifdef  HAVE_UNISTD_H
 102 # include <unistd.h>
 103 /* Ultrix's unistd.h always defines _POSIX_VERSION, but you only get
 104    POSIX.1 behavior with `cc -YPOSIX', which predefines POSIX itself!  */
 105 # if defined (_POSIX_VERSION) && !defined (ultrix) && !defined (VMS)
 106 #  define POSIX 1
 107 # endif
 108 #endif
 109
 110 /* Some systems define _POSIX_VERSION but are not really POSIX.1.  */
 111 #if (defined (butterfly) || defined (__arm) || (defined (__mips) && defined (_SYSTYPE_SVR3)) || (defined (sequent) && defined (i386)))
 112 # undef POSIX
 113 #endif
 114
 115 #if !defined (POSIX) && defined (_AIX) && defined (_POSIX_SOURCE)
 116 # define POSIX 1
 117 #endif
 118
 119 #ifndef RETSIGTYPE
 120 # define RETSIGTYPE     void
 121 #endif
 122
 123 #ifndef sigmask
 124 # define sigmask(sig)   (1 << ((sig) - 1))
 125 #endif
 126
 127 #ifndef HAVE_SA_RESTART
 128 # define SA_RESTART 0
 129 #endif
 130
 131 #ifdef  HAVE_LIMITS_H
 132 # include <limits.h>
 133 #endif
 134 #ifdef  HAVE_SYS_PARAM_H
 135 # include <sys/param.h>
 136 #endif
 137
 138 #ifndef PATH_MAX
 139 # ifndef POSIX
 140 #  define PATH_MAX      MAXPATHLEN
 141 # endif
 142 #endif
 143 #ifndef MAXPATHLEN
 144 # define MAXPATHLEN 1024
 145 #endif
 146
 147 #ifdef  PATH_MAX
 148 # define GET_PATH_MAX   PATH_MAX
 149 # define PATH_VAR(var)  char var[PATH_MAX]
 150 #else
 151 # define NEED_GET_PATH_MAX 1
 152 # define GET_PATH_MAX   (get_path_max ())
 153 # define PATH_VAR(var)  char *var = (char *) alloca (GET_PATH_MAX)
 154 extern unsigned int get_path_max PARAMS ((void));
 155 #endif
 156
 157 #ifndef CHAR_BIT
 158 # define CHAR_BIT 8
 159 #endif
 160
 161 /* Nonzero if the integer type T is signed.  */
 162 #define INTEGER_TYPE_SIGNED(t) ((t) -1 < 0)
 163
 164 /* The minimum and maximum values for the integer type T.
 165    Use ~ (t) 0, not -1, for portability to 1's complement hosts.  */
 166 #define INTEGER_TYPE_MINIMUM(t) \
 167   (! INTEGER_TYPE_SIGNED (t) ? (t) 0 : ~ (t) 0 << (sizeof (t) * CHAR_BIT - 1))
 168 #define INTEGER_TYPE_MAXIMUM(t) (~ (t) 0 - INTEGER_TYPE_MINIMUM (t))
 169
 170 #ifndef CHAR_MAX
 171 # define CHAR_MAX INTEGER_TYPE_MAXIMUM (char)
 172 #endif
 173
 174 #ifdef STAT_MACROS_BROKEN
 175 # ifdef S_ISREG
 176 #  undef S_ISREG
 177 # endif
 178 # ifdef S_ISDIR
 179 #  undef S_ISDIR
 180 # endif
 181 #endif  /* STAT_MACROS_BROKEN.  */
 182
 183 #ifndef S_ISREG
 184 # define S_ISREG(mode)  (((mode) & S_IFMT) == S_IFREG)
 185 #endif
 186 #ifndef S_ISDIR
 187 # define S_ISDIR(mode)  (((mode) & S_IFMT) == S_IFDIR)
 188 #endif
 189
 190 #ifdef VMS
 191 # include <types.h>
 192 # include <unixlib.h>
 193 # include <unixio.h>
 194 # include <perror.h>
 195 /* Needed to use alloca on VMS.  */
 196 # include <builtins.h>
 197 #endif
 198
 199 #ifndef __attribute__
 200 /* This feature is available in gcc versions 2.5 and later.  */
 201 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
 202 #  define __attribute__(x)
 203 # endif
 204 /* The __-protected variants of `format' and `printf' attributes
 205    are accepted by gcc versions 2.6.4 (effectively 2.7) and later.  */
 206 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
 207 #  define __format__ format
 208 #  define __printf__ printf
 209 # endif
 210 #endif
 211 #define UNUSED  __attribute__ ((unused))
 212
 213 #if defined (STDC_HEADERS) || defined (__GNU_LIBRARY__)
 214 # include <stdlib.h>
 215 # include <string.h>
 216 # define ANSI_STRING 1
 217 #else   /* No standard headers.  */
 218 # ifdef HAVE_STRING_H
 219 #  include <string.h>
 220 #  define ANSI_STRING 1
 221 # else
 222 #  include <strings.h>
 223 # endif
 224 # ifdef HAVE_MEMORY_H
 225 #  include <memory.h>
 226 # endif
 227 # ifdef HAVE_STDLIB_H
 228 #  include <stdlib.h>
 229 # else
 230 extern char *malloc PARAMS ((int));
 231 extern char *realloc PARAMS ((char *, int));
 232 extern void free PARAMS ((char *));
 233
 234 extern void abort PARAMS ((void)) __attribute__ ((noreturn));
 235 extern void exit PARAMS ((int)) __attribute__ ((noreturn));
 236 # endif /* HAVE_STDLIB_H.  */
 237
 238 #endif /* Standard headers.  */
 239
 240 /* These should be in stdlib.h.  Make sure we have them.  */
 241 #ifndef EXIT_SUCCESS
 242 # define EXIT_SUCCESS 0
 243 #endif
 244 #ifndef EXIT_FAILURE
 245 # define EXIT_FAILURE 0
 246 #endif
 247
 248 #ifdef  ANSI_STRING
 249
 250 # ifndef bcmp
 251 #  define bcmp(s1, s2, n)   memcmp ((s1), (s2), (n))
 252 # endif
 253 # ifndef bzero
 254 #  define bzero(s, n)       memset ((s), 0, (n))
 255 # endif
 256 # if defined(HAVE_MEMMOVE) && !defined(bcopy)
 257 #  define bcopy(s, d, n)    memmove ((d), (s), (n))
 258 # endif
 259
 260 #else   /* Not ANSI_STRING.  */
 261
 262 # ifndef HAVE_STRCHR
 263 #  define strchr(s, c)      index((s), (c))
 264 #  define strrchr(s, c)     rindex((s), (c))
 265 # endif
 266
 267 # ifndef bcmp
 268 extern int bcmp PARAMS ((const char *, const char *, int));
 269 # endif
 270 # ifndef bzero
 271 extern void bzero PARAMS ((char *, int));
 272 #endif
 273 # ifndef bcopy
 274 extern void bcopy PARAMS ((const char *b1, char *b2, int));
 275 # endif
 276
 277 /* SCO Xenix has a buggy macro definition in <string.h>.  */
 278 #undef  strerror
 279 #if !defined(__DECC)
 280 extern char *strerror PARAMS ((int errnum));
 281 #endif
 282
 283 #endif  /* !ANSI_STRING.  */
 284 #undef  ANSI_STRING
 285
 286 #if HAVE_INTTYPES_H
 287 # include <inttypes.h>
 288 #endif
 289 #define FILE_TIMESTAMP uintmax_t
 290
 291 #if !defined(HAVE_STRSIGNAL)
 292 extern char *strsignal PARAMS ((int signum));
 293 #endif
 294
 295 /* ISDIGIT offers the following features:
 296    - Its arg may be any int or unsigned int; it need not be an unsigned char.
 297    - It's guaranteed to evaluate its argument exactly once.
 298       NOTE!  Make relies on this behavior, don't change it!
 299    - It's typically faster.
 300    POSIX 1003.2-1992 section 2.5.2.1 page 50 lines 1556-1558 says that
 301    only '0' through '9' are digits.  Prefer ISDIGIT to isdigit() unless
 302    it's important to use the locale's definition of `digit' even when the
 303    host does not conform to POSIX.  */
 304 #define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
 305
 306 #ifndef iAPX286
 307 # define streq(a, b) \
 308    ((a) == (b) || \
 309     (*(a) == *(b) && (*(a) == '\0' || !strcmp ((a) + 1, (b) + 1))))
 310 # ifdef HAVE_CASE_INSENSITIVE_FS
 311 /* This is only used on Windows/DOS platforms, so we assume strcmpi().  */
 312 #  define strieq(a, b) \
 313     ((a) == (b) \
 314      || (tolower((unsigned char)*(a)) == tolower((unsigned char)*(b)) \
 315          && (*(a) == '\0' || !strcmpi ((a) + 1, (b) + 1))))
 316 # else
 317 #  define strieq(a, b) streq(a, b)
 318 # endif
 319 #else
 320 /* Buggy compiler can't handle this.  */
 321 # define streq(a, b) (strcmp ((a), (b)) == 0)
 322 # define strieq(a, b) (strcmp ((a), (b)) == 0)
 323 #endif
 324 #define strneq(a, b, l) (strncmp ((a), (b), (l)) == 0)
 325 #ifdef  VMS
 326 extern int strcmpi (const char *,const char *);
 327 #endif
 328
 329 #if defined(__GNUC__) || defined(ENUM_BITFIELDS)
 330 # define ENUM_BITFIELD(bits)    :bits
 331 #else
 332 # define ENUM_BITFIELD(bits)
 333 #endif
 334
 335 /* Handle gettext and locales.  */
 336
 337 #if HAVE_LOCALE_H
 338 # include <locale.h>
 339 #else
 340 # define setlocale(category, locale)
 341 #endif
 342
 343 #include <gettext.h>
 344
 345 #define _(msgid)            gettext (msgid)
 346 #define N_(msgid)           gettext_noop (msgid)
 347 #define S_(msg1,msg2,num)   ngettext (msg1,msg2,num)
 348
 349 /* Handle other OSs.  */
 350 #if defined(HAVE_DOS_PATHS)
 351 # define PATH_SEPARATOR_CHAR ';'
 352 #elif defined(VMS)
 353 # define PATH_SEPARATOR_CHAR ','
 354 #else
 355 # define PATH_SEPARATOR_CHAR ':'
 356 #endif
 357
 358 /* This is needed for getcwd() and chdir().  */
 359 #if defined(_MSC_VER) || defined(__BORLANDC__)
 360 # include <direct.h>
 361 #endif
 362
 363 #ifdef WINDOWS32
 364 # include <fcntl.h>
 365 # include <malloc.h>
 366 # define pipe(p) _pipe(p, 512, O_BINARY)
 367 # define kill(pid,sig) w32_kill(pid,sig)
 368
 369 extern void sync_Path_environment(void);
 370 extern int kill(int pid, int sig);
 371 extern char *end_of_token_w32(char *s, char stopchar);
 372 extern int find_and_set_default_shell(char *token);
 373
 374 /* indicates whether or not we have Bourne shell */
 375 extern int no_default_sh_exe;
 376
 377 /* is default_shell unixy? */
 378 extern int unixy_shell;
 379 #endif  /* WINDOWS32 */
 380
 381 struct floc
 382   {
 383     const char *filenm;
 384     unsigned long lineno;
 385   };
 386 #define NILF ((struct floc *)0)
 387
 388 #define STRING_SIZE_TUPLE(_s) (_s), (sizeof (_s)-1)
 389
 390 \f
 391 /* We have to have stdarg.h or varargs.h AND v*printf or doprnt to use
 392    variadic versions of these functions.  */
 393
 394 #if HAVE_STDARG_H || HAVE_VARARGS_H
 395 # if HAVE_VPRINTF || HAVE_DOPRNT
 396 #  define USE_VARIADIC 1
 397 # endif
 398 #endif
 399
 400 #if HAVE_ANSI_COMPILER && USE_VARIADIC && HAVE_STDARG_H
 401 extern void message (int prefix, const char *fmt, ...)
 402                      __attribute__ ((__format__ (__printf__, 2, 3)));
 403 extern void error (const struct floc *flocp, const char *fmt, ...)
 404                    __attribute__ ((__format__ (__printf__, 2, 3)));
 405 extern void fatal (const struct floc *flocp, const char *fmt, ...)
 406                    __attribute__ ((noreturn, __format__ (__printf__, 2, 3)));
 407 #else
 408 extern void message ();
 409 extern void error ();
 410 extern void fatal ();
 411 #endif
 412
 413 extern void die PARAMS ((int)) __attribute__ ((noreturn));
 414 extern void log_working_directory PARAMS ((int));
 415 extern void pfatal_with_name PARAMS ((const char *)) __attribute__ ((noreturn));
 416 extern void perror_with_name PARAMS ((const char *, const char *));
 417 extern char *savestring PARAMS ((const char *, unsigned int));
 418 extern char *concat PARAMS ((const char *, const char *, const char *));
 419 extern char *xmalloc PARAMS ((unsigned int));
 420 extern char *xrealloc PARAMS ((char *, unsigned int));
 421 extern char *xstrdup PARAMS ((const char *));
 422 extern char *find_next_token PARAMS ((char **, unsigned int *));
 423 extern char *next_token PARAMS ((const char *));
 424 extern char *end_of_token PARAMS ((const char *));
 425 extern void collapse_continuations PARAMS ((char *));
 426 extern char *lindex PARAMS ((const char *, const char *, int));
 427 extern int alpha_compare PARAMS ((const void *, const void *));
 428 extern void print_spaces PARAMS ((unsigned int));
 429 extern char *find_percent PARAMS ((char *));
 430 extern FILE *open_tmpfile PARAMS ((char **, const char *));
 431
 432 #ifndef NO_ARCHIVES
 433 extern int ar_name PARAMS ((char *));
 434 extern void ar_parse_name PARAMS ((char *, char **, char **));
 435 extern int ar_touch PARAMS ((char *));
 436 extern time_t ar_member_date PARAMS ((char *));
 437 #endif
 438
 439 extern int dir_file_exists_p PARAMS ((char *, char *));
 440 extern int file_exists_p PARAMS ((char *));
 441 extern int file_impossible_p PARAMS ((char *));
 442 extern void file_impossible PARAMS ((char *));
 443 extern char *dir_name PARAMS ((char *));
 444 extern void hash_init_directories PARAMS ((void));
 445
 446 extern void define_default_variables PARAMS ((void));
 447 extern void set_default_suffixes PARAMS ((void));
 448 extern void install_default_suffix_rules PARAMS ((void));
 449 extern void install_default_implicit_rules PARAMS ((void));
 450
 451 extern void build_vpath_lists PARAMS ((void));
 452 extern void construct_vpath_list PARAMS ((char *pattern, char *dirpath));
 453 extern int vpath_search PARAMS ((char **file, FILE_TIMESTAMP *mtime_ptr));
 454 extern int gpath_search PARAMS ((char *file, unsigned int len));
 455
 456 extern void construct_include_path PARAMS ((char **arg_dirs));
 457
 458 extern void user_access PARAMS ((void));
 459 extern void make_access PARAMS ((void));
 460 extern void child_access PARAMS ((void));
 461
 462 extern void close_stdout PARAMS ((void));
 463
 464 extern char *strip_whitespace PARAMS ((const char **begpp, const char **endpp));
 465
 466 /* String caching  */
 467 extern void strcache_init PARAMS ((void));
 468 extern void strcache_print_stats PARAMS ((const char *prefix));
 469 extern int strcache_iscached PARAMS ((const char *str));
 470 extern const char *strcache_add PARAMS ((const char *str));
 471 extern const char *strcache_add_len PARAMS ((const char *str, int len));
 472 extern int strcache_setbufsize PARAMS ((int size));
 473
 474 #ifdef  HAVE_VFORK_H
 475 # include <vfork.h>
 476 #endif
 477
 478 /* We omit these declarations on non-POSIX systems which define _POSIX_VERSION,
 479    because such systems often declare them in header files anyway.  */
 480
 481 #if !defined (__GNU_LIBRARY__) && !defined (POSIX) && !defined (_POSIX_VERSION) && !defined(WINDOWS32)
 482
 483 extern long int atol ();
 484 # ifndef VMS
 485 extern long int lseek ();
 486 # endif
 487
 488 #endif  /* Not GNU C library or POSIX.  */
 489
 490 #ifdef  HAVE_GETCWD
 491 # if !defined(VMS) && !defined(__DECC)
 492 extern char *getcwd ();
 493 # endif
 494 #else
 495 extern char *getwd ();
 496 # define getcwd(buf, len)       getwd (buf)
 497 #endif
 498
 499 extern const struct floc *reading_file;
 500 extern const struct floc **expanding_var;
 501
 502 extern char **environ;
 503
 504 extern int just_print_flag, silent_flag, ignore_errors_flag, keep_going_flag;
 505 extern int print_data_base_flag, question_flag, touch_flag, always_make_flag;
 506 extern int env_overrides, no_builtin_rules_flag, no_builtin_variables_flag;
 507 extern int print_version_flag, print_directory_flag, check_symlink_flag;
 508 extern int warn_undefined_variables_flag, posix_pedantic, not_parallel;
 509 extern int second_expansion, clock_skew_detected, rebuilding_makefiles;
 510
 511 /* can we run commands via 'sh -c xxx' or must we use batch files? */
 512 extern int batch_mode_shell;
 513
 514 extern unsigned int job_slots;
 515 extern int job_fds[2];
 516 extern int job_rfd;
 517 #ifndef NO_FLOAT
 518 extern double max_load_average;
 519 #else
 520 extern int max_load_average;
 521 #endif
 522
 523 extern char *program;
 524 extern char *starting_directory;
 525 extern unsigned int makelevel;
 526 extern char *version_string, *remote_description, *make_host;
 527
 528 extern unsigned int commands_started;
 529
 530 extern int handling_fatal_signal;
 531
 532
 533 #ifndef MIN
 534 #define MIN(_a,_b) ((_a)<(_b)?(_a):(_b))
 535 #endif
 536 #ifndef MAX
 537 #define MAX(_a,_b) ((_a)>(_b)?(_a):(_b))
 538 #endif
 539
 540 #ifdef VMS
 541 #  define MAKE_SUCCESS 1
 542 #  define MAKE_TROUBLE 2
 543 #  define MAKE_FAILURE 3
 544 #else
 545 #  define MAKE_SUCCESS 0
 546 #  define MAKE_TROUBLE 1
 547 #  define MAKE_FAILURE 2
 548 #endif
 549
 550 /* Set up heap debugging library dmalloc.  */
 551
 552 #ifdef HAVE_DMALLOC_H
 553 #include <dmalloc.h>
 554 #endif
 555
 556 #ifndef initialize_main
 557 # ifdef __EMX__
 558 #  define initialize_main(pargc, pargv) \
 559                           { _wildcard(pargc, pargv); _response(pargc, pargv); }
 560 # else
 561 #  define initialize_main(pargc, pargv)
 562 # endif
 563 #endif
 564
 565
 566 #ifdef __EMX__
 567 # if !HAVE_STRCASECMP
 568 #  define strcasecmp stricmp
 569 # endif
 570
 571 # if !defined chdir
 572 #  define chdir _chdir2
 573 # endif
 574 # if !defined getcwd
 575 #  define getcwd _getcwd2
 576 # endif
 577
 578 /* NO_CHDIR2 causes make not to use _chdir2() and _getcwd2() instead of
 579    chdir() and getcwd(). This avoids some error messages for the
 580    make testsuite but restricts the drive letter support. */
 581 # ifdef NO_CHDIR2
 582 #  warning NO_CHDIR2: usage of drive letters restricted
 583 #  undef chdir
 584 #  undef getcwd
 585 # endif
 586 #endif
 587
 588 #ifndef initialize_main
 589 # define initialize_main(pargc, pargv)
 590 #endif
 591
 592
 593 /* Some systems (like Solaris, PTX, etc.) do not support the SA_RESTART flag
 594    properly according to POSIX.  So, we try to wrap common system calls with
 595    checks for EINTR.  Note that there are still plenty of system calls that
 596    can fail with EINTR but this, reportedly, gets the vast majority of
 597    failure cases.  If you still experience failures you'll need to either get
 598    a system where SA_RESTART works, or you need to avoid -j.  */
 599
 600 #define EINTRLOOP(_v,_c)   while (((_v)=_c)==-1 && errno==EINTR)
 601
 602 /* While system calls that return integers are pretty consistent about
 603    returning -1 on failure and setting errno in that case, functions that
 604    return pointers are not always so well behaved.  Sometimes they return
 605    NULL for expected behavior: one good example is readdir() which returns
 606    NULL at the end of the directory--and _doesn't_ reset errno.  So, we have
 607    to do it ourselves here.  */
 608
 609 #define ENULLLOOP(_v,_c)   do{ errno = 0; \
 610                                while (((_v)=_c)==0 && errno==EINTR); }while(0)
 611