Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit merge-base: teach "--fork-point" mode (d96855f)
   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#define _FILE_OFFSET_BITS 64
   5
   6#ifndef FLEX_ARRAY
   7/*
   8 * See if our compiler is known to support flexible array members.
   9 */
  10#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
  11# define FLEX_ARRAY /* empty */
  12#elif defined(__GNUC__)
  13# if (__GNUC__ >= 3)
  14#  define FLEX_ARRAY /* empty */
  15# else
  16#  define FLEX_ARRAY 0 /* older GNU extension */
  17# endif
  18#endif
  19
  20/*
  21 * Otherwise, default to safer but a bit wasteful traditional style
  22 */
  23#ifndef FLEX_ARRAY
  24# define FLEX_ARRAY 1
  25#endif
  26#endif
  27
  28#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  29#define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  30
  31#define maximum_signed_value_of_type(a) \
  32    (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
  33
  34#define maximum_unsigned_value_of_type(a) \
  35    (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
  36
  37/*
  38 * Signed integer overflow is undefined in C, so here's a helper macro
  39 * to detect if the sum of two integers will overflow.
  40 *
  41 * Requires: a >= 0, typeof(a) equals typeof(b)
  42 */
  43#define signed_add_overflows(a, b) \
  44    ((b) > maximum_signed_value_of_type(a) - (a))
  45
  46#define unsigned_add_overflows(a, b) \
  47    ((b) > maximum_unsigned_value_of_type(a) - (a))
  48
  49#ifdef __GNUC__
  50#define TYPEOF(x) (__typeof__(x))
  51#else
  52#define TYPEOF(x)
  53#endif
  54
  55#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
  56#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
  57
  58#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  59
  60/* Approximation of the length of the decimal representation of this type. */
  61#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  62
  63#if defined(__sun__)
  64 /*
  65  * On Solaris, when _XOPEN_EXTENDED is set, its header file
  66  * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
  67  * setting to say we are XPG5 or XPG6.  Also on Solaris,
  68  * XPG6 programs must be compiled with a c99 compiler, while
  69  * non XPG6 programs must be compiled with a pre-c99 compiler.
  70  */
  71# if __STDC_VERSION__ - 0 >= 199901L
  72# define _XOPEN_SOURCE 600
  73# else
  74# define _XOPEN_SOURCE 500
  75# endif
  76#elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
  77      !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
  78      !defined(__TANDEM) && !defined(__QNX__)
  79#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  80#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  81#endif
  82#define _ALL_SOURCE 1
  83#define _GNU_SOURCE 1
  84#define _BSD_SOURCE 1
  85#define _NETBSD_SOURCE 1
  86#define _SGI_SOURCE 1
  87
  88#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
  89# if defined (_MSC_VER)
  90#  define _WIN32_WINNT 0x0502
  91# endif
  92#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  93#include <winsock2.h>
  94#include <windows.h>
  95#define GIT_WINDOWS_NATIVE
  96#endif
  97
  98#include <unistd.h>
  99#include <stdio.h>
 100#include <sys/stat.h>
 101#include <fcntl.h>
 102#include <stddef.h>
 103#include <stdlib.h>
 104#include <stdarg.h>
 105#include <string.h>
 106#ifdef HAVE_STRINGS_H
 107#include <strings.h> /* for strcasecmp() */
 108#endif
 109#include <errno.h>
 110#include <limits.h>
 111#ifdef NEEDS_SYS_PARAM_H
 112#include <sys/param.h>
 113#endif
 114#include <sys/types.h>
 115#include <dirent.h>
 116#include <sys/time.h>
 117#include <time.h>
 118#include <signal.h>
 119#ifndef USE_WILDMATCH
 120#include <fnmatch.h>
 121#endif
 122#include <assert.h>
 123#include <regex.h>
 124#include <utime.h>
 125#include <syslog.h>
 126#ifndef NO_SYS_POLL_H
 127#include <sys/poll.h>
 128#else
 129#include <poll.h>
 130#endif
 131
 132extern int get_st_mode_bits(const char *path, int *mode);
 133
 134#if defined(__MINGW32__)
 135/* pull in Windows compatibility stuff */
 136#include "compat/mingw.h"
 137#elif defined(_MSC_VER)
 138#include "compat/msvc.h"
 139#else
 140#include <sys/wait.h>
 141#include <sys/resource.h>
 142#include <sys/socket.h>
 143#include <sys/ioctl.h>
 144#include <termios.h>
 145#ifndef NO_SYS_SELECT_H
 146#include <sys/select.h>
 147#endif
 148#include <netinet/in.h>
 149#include <netinet/tcp.h>
 150#include <arpa/inet.h>
 151#include <netdb.h>
 152#include <pwd.h>
 153#include <sys/un.h>
 154#ifndef NO_INTTYPES_H
 155#include <inttypes.h>
 156#else
 157#include <stdint.h>
 158#endif
 159#ifdef NO_INTPTR_T
 160/*
 161 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 162 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 163 * while on IP16 and IP16L32 it is "int" (resp. "short")
 164 * Size needs to match (or exceed) 'sizeof(void *)'.
 165 * We can't take "long long" here as not everybody has it.
 166 */
 167typedef long intptr_t;
 168typedef unsigned long uintptr_t;
 169#endif
 170#if defined(__CYGWIN__)
 171#undef _XOPEN_SOURCE
 172#include <grp.h>
 173#define _XOPEN_SOURCE 600
 174#include "compat/cygwin.h"
 175#else
 176#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 177#include <grp.h>
 178#define _ALL_SOURCE 1
 179#endif
 180#endif
 181
 182/* used on Mac OS X */
 183#ifdef PRECOMPOSE_UNICODE
 184#include "compat/precompose_utf8.h"
 185#else
 186#define precompose_str(in,i_nfd2nfc)
 187#define precompose_argv(c,v)
 188#define probe_utf8_pathname_composition(a,b)
 189#endif
 190
 191#ifdef NEEDS_CLIPPED_WRITE
 192ssize_t clipped_write(int fildes, const void *buf, size_t nbyte);
 193#define write(x,y,z) clipped_write((x),(y),(z))
 194#endif
 195
 196#ifdef MKDIR_WO_TRAILING_SLASH
 197#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 198extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 199#endif
 200
 201#ifdef NO_STRUCT_ITIMERVAL
 202struct itimerval {
 203        struct timeval it_interval;
 204        struct timeval it_value;
 205}
 206#endif
 207
 208#ifdef NO_SETITIMER
 209#define setitimer(which,value,ovalue)
 210#endif
 211
 212#ifndef NO_LIBGEN_H
 213#include <libgen.h>
 214#else
 215#define basename gitbasename
 216extern char *gitbasename(char *);
 217#endif
 218
 219#ifndef NO_ICONV
 220#include <iconv.h>
 221#endif
 222
 223#ifndef NO_OPENSSL
 224#include <openssl/ssl.h>
 225#include <openssl/err.h>
 226#endif
 227
 228/* On most systems <netdb.h> would have given us this, but
 229 * not on some systems (e.g. z/OS).
 230 */
 231#ifndef NI_MAXHOST
 232#define NI_MAXHOST 1025
 233#endif
 234
 235#ifndef NI_MAXSERV
 236#define NI_MAXSERV 32
 237#endif
 238
 239/* On most systems <limits.h> would have given us this, but
 240 * not on some systems (e.g. GNU/Hurd).
 241 */
 242#ifndef PATH_MAX
 243#define PATH_MAX 4096
 244#endif
 245
 246#ifndef PRIuMAX
 247#define PRIuMAX "llu"
 248#endif
 249
 250#ifndef PRIu32
 251#define PRIu32 "u"
 252#endif
 253
 254#ifndef PRIx32
 255#define PRIx32 "x"
 256#endif
 257
 258#ifndef PRIo32
 259#define PRIo32 "o"
 260#endif
 261
 262#ifndef PATH_SEP
 263#define PATH_SEP ':'
 264#endif
 265
 266#ifdef HAVE_PATHS_H
 267#include <paths.h>
 268#endif
 269#ifndef _PATH_DEFPATH
 270#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 271#endif
 272
 273#ifndef STRIP_EXTENSION
 274#define STRIP_EXTENSION ""
 275#endif
 276
 277#ifndef has_dos_drive_prefix
 278#define has_dos_drive_prefix(path) 0
 279#endif
 280
 281#ifndef is_dir_sep
 282#define is_dir_sep(c) ((c) == '/')
 283#endif
 284
 285#ifndef find_last_dir_sep
 286#define find_last_dir_sep(path) strrchr(path, '/')
 287#endif
 288
 289#if defined(__HP_cc) && (__HP_cc >= 61000)
 290#define NORETURN __attribute__((noreturn))
 291#define NORETURN_PTR
 292#elif defined(__GNUC__) && !defined(NO_NORETURN)
 293#define NORETURN __attribute__((__noreturn__))
 294#define NORETURN_PTR __attribute__((__noreturn__))
 295#elif defined(_MSC_VER)
 296#define NORETURN __declspec(noreturn)
 297#define NORETURN_PTR
 298#else
 299#define NORETURN
 300#define NORETURN_PTR
 301#ifndef __attribute__
 302#define __attribute__(x)
 303#endif
 304#endif
 305
 306/* The sentinel attribute is valid from gcc version 4.0 */
 307#if defined(__GNUC__) && (__GNUC__ >= 4)
 308#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 309#else
 310#define LAST_ARG_MUST_BE_NULL
 311#endif
 312
 313#include "compat/bswap.h"
 314
 315#ifdef USE_WILDMATCH
 316#include "wildmatch.h"
 317#define FNM_PATHNAME WM_PATHNAME
 318#define FNM_CASEFOLD WM_CASEFOLD
 319#define FNM_NOMATCH  WM_NOMATCH
 320static inline int fnmatch(const char *pattern, const char *string, int flags)
 321{
 322        return wildmatch(pattern, string, flags, NULL);
 323}
 324#endif
 325
 326/* General helper functions */
 327extern void vreportf(const char *prefix, const char *err, va_list params);
 328extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 329extern NORETURN void usage(const char *err);
 330extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 331extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 332extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 333extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 334extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 335
 336/*
 337 * Let callers be aware of the constant return value; this can help
 338 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 339 * because some compilers may not support variadic macros. Since we're only
 340 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 341 * using the function as usual.
 342 */
 343#if defined(__GNUC__) && ! defined(__clang__)
 344#define error(...) (error(__VA_ARGS__), -1)
 345#endif
 346
 347extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 348extern void set_error_routine(void (*routine)(const char *err, va_list params));
 349extern void set_die_is_recursing_routine(int (*routine)(void));
 350
 351extern int prefixcmp(const char *str, const char *prefix);
 352extern int suffixcmp(const char *str, const char *suffix);
 353
 354static inline const char *skip_prefix(const char *str, const char *prefix)
 355{
 356        size_t len = strlen(prefix);
 357        return strncmp(str, prefix, len) ? NULL : str + len;
 358}
 359
 360#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 361
 362#ifndef PROT_READ
 363#define PROT_READ 1
 364#define PROT_WRITE 2
 365#define MAP_PRIVATE 1
 366#endif
 367
 368#define mmap git_mmap
 369#define munmap git_munmap
 370extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 371extern int git_munmap(void *start, size_t length);
 372
 373#else /* NO_MMAP || USE_WIN32_MMAP */
 374
 375#include <sys/mman.h>
 376
 377#endif /* NO_MMAP || USE_WIN32_MMAP */
 378
 379#ifdef NO_MMAP
 380
 381/* This value must be multiple of (pagesize * 2) */
 382#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 383
 384#else /* NO_MMAP */
 385
 386/* This value must be multiple of (pagesize * 2) */
 387#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 388        (sizeof(void*) >= 8 \
 389                ?  1 * 1024 * 1024 * 1024 \
 390                : 32 * 1024 * 1024)
 391
 392#endif /* NO_MMAP */
 393
 394#ifndef MAP_FAILED
 395#define MAP_FAILED ((void *)-1)
 396#endif
 397
 398#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 399#define on_disk_bytes(st) ((st).st_size)
 400#else
 401#define on_disk_bytes(st) ((st).st_blocks * 512)
 402#endif
 403
 404#define DEFAULT_PACKED_GIT_LIMIT \
 405        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 406
 407#ifdef NO_PREAD
 408#define pread git_pread
 409extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 410#endif
 411/*
 412 * Forward decl that will remind us if its twin in cache.h changes.
 413 * This function is used in compat/pread.c.  But we can't include
 414 * cache.h there.
 415 */
 416extern ssize_t read_in_full(int fd, void *buf, size_t count);
 417
 418#ifdef NO_SETENV
 419#define setenv gitsetenv
 420extern int gitsetenv(const char *, const char *, int);
 421#endif
 422
 423#ifdef NO_MKDTEMP
 424#define mkdtemp gitmkdtemp
 425extern char *gitmkdtemp(char *);
 426#endif
 427
 428#ifdef NO_MKSTEMPS
 429#define mkstemps gitmkstemps
 430extern int gitmkstemps(char *, int);
 431#endif
 432
 433#ifdef NO_UNSETENV
 434#define unsetenv gitunsetenv
 435extern void gitunsetenv(const char *);
 436#endif
 437
 438#ifdef NO_STRCASESTR
 439#define strcasestr gitstrcasestr
 440extern char *gitstrcasestr(const char *haystack, const char *needle);
 441#endif
 442
 443#ifdef NO_STRLCPY
 444#define strlcpy gitstrlcpy
 445extern size_t gitstrlcpy(char *, const char *, size_t);
 446#endif
 447
 448#ifdef NO_STRTOUMAX
 449#define strtoumax gitstrtoumax
 450extern uintmax_t gitstrtoumax(const char *, char **, int);
 451#define strtoimax gitstrtoimax
 452extern intmax_t gitstrtoimax(const char *, char **, int);
 453#endif
 454
 455#ifdef NO_HSTRERROR
 456#define hstrerror githstrerror
 457extern const char *githstrerror(int herror);
 458#endif
 459
 460#ifdef NO_MEMMEM
 461#define memmem gitmemmem
 462void *gitmemmem(const void *haystack, size_t haystacklen,
 463                const void *needle, size_t needlelen);
 464#endif
 465
 466#ifdef NO_GETPAGESIZE
 467#define getpagesize() sysconf(_SC_PAGESIZE)
 468#endif
 469
 470#ifdef FREAD_READS_DIRECTORIES
 471#ifdef fopen
 472#undef fopen
 473#endif
 474#define fopen(a,b) git_fopen(a,b)
 475extern FILE *git_fopen(const char*, const char*);
 476#endif
 477
 478#ifdef SNPRINTF_RETURNS_BOGUS
 479#define snprintf git_snprintf
 480extern int git_snprintf(char *str, size_t maxsize,
 481                        const char *format, ...);
 482#define vsnprintf git_vsnprintf
 483extern int git_vsnprintf(char *str, size_t maxsize,
 484                         const char *format, va_list ap);
 485#endif
 486
 487#ifdef __GLIBC_PREREQ
 488#if __GLIBC_PREREQ(2, 1)
 489#define HAVE_STRCHRNUL
 490#define HAVE_MEMPCPY
 491#endif
 492#endif
 493
 494#ifndef HAVE_STRCHRNUL
 495#define strchrnul gitstrchrnul
 496static inline char *gitstrchrnul(const char *s, int c)
 497{
 498        while (*s && *s != c)
 499                s++;
 500        return (char *)s;
 501}
 502#endif
 503
 504#ifndef HAVE_MEMPCPY
 505#define mempcpy gitmempcpy
 506static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 507{
 508        return (char *)memcpy(dest, src, n) + n;
 509}
 510#endif
 511
 512#ifdef NO_INET_PTON
 513int inet_pton(int af, const char *src, void *dst);
 514#endif
 515
 516#ifdef NO_INET_NTOP
 517const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 518#endif
 519
 520extern void release_pack_memory(size_t, int);
 521
 522typedef void (*try_to_free_t)(size_t);
 523extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 524
 525extern char *xstrdup(const char *str);
 526extern void *xmalloc(size_t size);
 527extern void *xmallocz(size_t size);
 528extern void *xmemdupz(const void *data, size_t len);
 529extern char *xstrndup(const char *str, size_t len);
 530extern void *xrealloc(void *ptr, size_t size);
 531extern void *xcalloc(size_t nmemb, size_t size);
 532extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 533extern ssize_t xread(int fd, void *buf, size_t len);
 534extern ssize_t xwrite(int fd, const void *buf, size_t len);
 535extern int xdup(int fd);
 536extern FILE *xfdopen(int fd, const char *mode);
 537extern int xmkstemp(char *template);
 538extern int xmkstemp_mode(char *template, int mode);
 539extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 540extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 541
 542static inline size_t xsize_t(off_t len)
 543{
 544        if (len > (size_t) len)
 545                die("Cannot handle files this big");
 546        return (size_t)len;
 547}
 548
 549static inline int has_extension(const char *filename, const char *ext)
 550{
 551        size_t len = strlen(filename);
 552        size_t extlen = strlen(ext);
 553        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 554}
 555
 556/* in ctype.c, for kwset users */
 557extern const char tolower_trans_tbl[256];
 558
 559/* Sane ctype - no locale, and works with signed chars */
 560#undef isascii
 561#undef isspace
 562#undef isdigit
 563#undef isalpha
 564#undef isalnum
 565#undef isprint
 566#undef islower
 567#undef isupper
 568#undef tolower
 569#undef toupper
 570#undef iscntrl
 571#undef ispunct
 572#undef isxdigit
 573
 574extern const unsigned char sane_ctype[256];
 575#define GIT_SPACE 0x01
 576#define GIT_DIGIT 0x02
 577#define GIT_ALPHA 0x04
 578#define GIT_GLOB_SPECIAL 0x08
 579#define GIT_REGEX_SPECIAL 0x10
 580#define GIT_PATHSPEC_MAGIC 0x20
 581#define GIT_CNTRL 0x40
 582#define GIT_PUNCT 0x80
 583#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 584#define isascii(x) (((x) & ~0x7f) == 0)
 585#define isspace(x) sane_istest(x,GIT_SPACE)
 586#define isdigit(x) sane_istest(x,GIT_DIGIT)
 587#define isalpha(x) sane_istest(x,GIT_ALPHA)
 588#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 589#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 590#define islower(x) sane_iscase(x, 1)
 591#define isupper(x) sane_iscase(x, 0)
 592#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 593#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 594#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 595#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 596                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 597#define isxdigit(x) (hexval_table[x] != -1)
 598#define tolower(x) sane_case((unsigned char)(x), 0x20)
 599#define toupper(x) sane_case((unsigned char)(x), 0)
 600#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 601
 602static inline int sane_case(int x, int high)
 603{
 604        if (sane_istest(x, GIT_ALPHA))
 605                x = (x & ~0x20) | high;
 606        return x;
 607}
 608
 609static inline int sane_iscase(int x, int is_lower)
 610{
 611        if (!sane_istest(x, GIT_ALPHA))
 612                return 0;
 613
 614        if (is_lower)
 615                return (x & 0x20) != 0;
 616        else
 617                return (x & 0x20) == 0;
 618}
 619
 620static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 621{
 622        unsigned long ul;
 623        char *p;
 624
 625        errno = 0;
 626        ul = strtoul(s, &p, base);
 627        if (errno || *p || p == s || (unsigned int) ul != ul)
 628                return -1;
 629        *result = ul;
 630        return 0;
 631}
 632
 633static inline int strtol_i(char const *s, int base, int *result)
 634{
 635        long ul;
 636        char *p;
 637
 638        errno = 0;
 639        ul = strtol(s, &p, base);
 640        if (errno || *p || p == s || (int) ul != ul)
 641                return -1;
 642        *result = ul;
 643        return 0;
 644}
 645
 646#ifdef INTERNAL_QSORT
 647void git_qsort(void *base, size_t nmemb, size_t size,
 648               int(*compar)(const void *, const void *));
 649#define qsort git_qsort
 650#endif
 651
 652#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 653# define FORCE_DIR_SET_GID S_ISGID
 654#else
 655# define FORCE_DIR_SET_GID 0
 656#endif
 657
 658#ifdef NO_NSEC
 659#undef USE_NSEC
 660#define ST_CTIME_NSEC(st) 0
 661#define ST_MTIME_NSEC(st) 0
 662#else
 663#ifdef USE_ST_TIMESPEC
 664#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 665#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 666#else
 667#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 668#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 669#endif
 670#endif
 671
 672#ifdef UNRELIABLE_FSTAT
 673#define fstat_is_reliable() 0
 674#else
 675#define fstat_is_reliable() 1
 676#endif
 677
 678#ifndef va_copy
 679/*
 680 * Since an obvious implementation of va_list would be to make it a
 681 * pointer into the stack frame, a simple assignment will work on
 682 * many systems.  But let's try to be more portable.
 683 */
 684#ifdef __va_copy
 685#define va_copy(dst, src) __va_copy(dst, src)
 686#else
 687#define va_copy(dst, src) ((dst) = (src))
 688#endif
 689#endif
 690
 691/*
 692 * Preserves errno, prints a message, but gives no warning for ENOENT.
 693 * Always returns the return value of unlink(2).
 694 */
 695int unlink_or_warn(const char *path);
 696/*
 697 * Likewise for rmdir(2).
 698 */
 699int rmdir_or_warn(const char *path);
 700/*
 701 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 702 * the supplied file mode.
 703 */
 704int remove_or_warn(unsigned int mode, const char *path);
 705
 706/*
 707 * Call access(2), but warn for any error except "missing file"
 708 * (ENOENT or ENOTDIR).
 709 */
 710#define ACCESS_EACCES_OK (1U << 0)
 711int access_or_warn(const char *path, int mode, unsigned flag);
 712int access_or_die(const char *path, int mode, unsigned flag);
 713
 714/* Warn on an inaccessible file that ought to be accessible */
 715void warn_on_inaccessible(const char *path);
 716
 717/* Get the passwd entry for the UID of the current process. */
 718struct passwd *xgetpwuid_self(void);
 719
 720#endif