src/include/port.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * port.h
   4  *        Header for src/port/ compatibility functions.
   5  *
   6  * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
   7  * Portions Copyright (c) 1994, Regents of the University of California
   8  *
   9  * src/include/port.h
  10  *
  11  *-------------------------------------------------------------------------
  12  */
  13 #ifndef PG_PORT_H
  14 #define PG_PORT_H
  15
  16 #include <ctype.h>
  17
  18 /*
  19  * Windows has enough specialized port stuff that we push most of it off
  20  * into another file.
  21  * Note: Some CYGWIN includes might #define WIN32.
  22  */
  23 #if defined(WIN32) && !defined(__CYGWIN__)
  24 #include "port/win32_port.h"
  25 #endif
  26
  27 /* socket has a different definition on WIN32 */
  28 #ifndef WIN32
  29 typedef int pgsocket;
  30
  31 #define PGINVALID_SOCKET (-1)
  32 #else
  33 typedef SOCKET pgsocket;
  34
  35 #define PGINVALID_SOCKET INVALID_SOCKET
  36 #endif
  37
  38 /* if platform lacks socklen_t, we assume this will work */
  39 #ifndef HAVE_SOCKLEN_T
  40 typedef unsigned int socklen_t;
  41 #endif
  42
  43 /* non-blocking */
  44 extern bool pg_set_noblock(pgsocket sock);
  45 extern bool pg_set_block(pgsocket sock);
  46
  47 /* Portable path handling for Unix/Win32 (in path.c) */
  48
  49 extern bool has_drive_prefix(const char *path);
  50 extern char *first_dir_separator(const char *filename);
  51 extern char *last_dir_separator(const char *filename);
  52 extern char *first_path_var_separator(const char *pathlist);
  53 extern void join_path_components(char *ret_path,
  54                                                                  const char *head, const char *tail);
  55 extern void canonicalize_path(char *path);
  56 extern void make_native_path(char *filename);
  57 extern void cleanup_path(char *path);
  58 extern bool path_contains_parent_reference(const char *path);
  59 extern bool path_is_relative_and_below_cwd(const char *path);
  60 extern bool path_is_prefix_of_path(const char *path1, const char *path2);
  61 extern char *make_absolute_path(const char *path);
  62 extern const char *get_progname(const char *argv0);
  63 extern void get_share_path(const char *my_exec_path, char *ret_path);
  64 extern void get_etc_path(const char *my_exec_path, char *ret_path);
  65 extern void get_include_path(const char *my_exec_path, char *ret_path);
  66 extern void get_pkginclude_path(const char *my_exec_path, char *ret_path);
  67 extern void get_includeserver_path(const char *my_exec_path, char *ret_path);
  68 extern void get_lib_path(const char *my_exec_path, char *ret_path);
  69 extern void get_pkglib_path(const char *my_exec_path, char *ret_path);
  70 extern void get_locale_path(const char *my_exec_path, char *ret_path);
  71 extern void get_doc_path(const char *my_exec_path, char *ret_path);
  72 extern void get_html_path(const char *my_exec_path, char *ret_path);
  73 extern void get_man_path(const char *my_exec_path, char *ret_path);
  74 extern bool get_home_path(char *ret_path);
  75 extern void get_parent_directory(char *path);
  76
  77 /* common/pgfnames.c */
  78 extern char **pgfnames(const char *path);
  79 extern void pgfnames_cleanup(char **filenames);
  80
  81 #define IS_NONWINDOWS_DIR_SEP(ch)       ((ch) == '/')
  82 #define is_nonwindows_absolute_path(filename) \
  83 ( \
  84         IS_NONWINDOWS_DIR_SEP((filename)[0]) \
  85 )
  86
  87 #define IS_WINDOWS_DIR_SEP(ch)  ((ch) == '/' || (ch) == '\\')
  88 /* See path_is_relative_and_below_cwd() for how we handle 'E:abc'. */
  89 #define is_windows_absolute_path(filename) \
  90 ( \
  91         IS_WINDOWS_DIR_SEP((filename)[0]) || \
  92         (isalpha((unsigned char) ((filename)[0])) && (filename)[1] == ':' && \
  93          IS_WINDOWS_DIR_SEP((filename)[2])) \
  94 )
  95
  96 /*
  97  *      is_absolute_path and IS_DIR_SEP
  98  *
  99  *      By using macros here we avoid needing to include path.c in libpq.
 100  */
 101 #ifndef WIN32
 102 #define IS_DIR_SEP(ch) IS_NONWINDOWS_DIR_SEP(ch)
 103 #define is_absolute_path(filename) is_nonwindows_absolute_path(filename)
 104 #else
 105 #define IS_DIR_SEP(ch) IS_WINDOWS_DIR_SEP(ch)
 106 #define is_absolute_path(filename) is_windows_absolute_path(filename)
 107 #endif
 108
 109 /*
 110  * This macro provides a centralized list of all errnos that identify
 111  * hard failure of a previously-established network connection.
 112  * The macro is intended to be used in a switch statement, in the form
 113  * "case ALL_CONNECTION_FAILURE_ERRNOS:".
 114  *
 115  * Note: this groups EPIPE and ECONNRESET, which we take to indicate a
 116  * probable server crash, with other errors that indicate loss of network
 117  * connectivity without proving much about the server's state.  Places that
 118  * are actually reporting errors typically single out EPIPE and ECONNRESET,
 119  * while allowing the network failures to be reported generically.
 120  */
 121 #define ALL_CONNECTION_FAILURE_ERRNOS \
 122         EPIPE: \
 123         case ECONNRESET: \
 124         case ECONNABORTED: \
 125         case EHOSTDOWN: \
 126         case EHOSTUNREACH: \
 127         case ENETDOWN: \
 128         case ENETRESET: \
 129         case ENETUNREACH: \
 130         case ETIMEDOUT
 131
 132 /* Portable locale initialization (in exec.c) */
 133 extern void set_pglocale_pgservice(const char *argv0, const char *app);
 134
 135 /* Portable way to find and execute binaries (in exec.c) */
 136 extern int      validate_exec(const char *path);
 137 extern int      find_my_exec(const char *argv0, char *retpath);
 138 extern int      find_other_exec(const char *argv0, const char *target,
 139                                                         const char *versionstr, char *retpath);
 140 extern char *pipe_read_line(char *cmd, char *line, int maxsize);
 141
 142 /* Doesn't belong here, but this is used with find_other_exec(), so... */
 143 #define PG_BACKEND_VERSIONSTR "postgres (PostgreSQL) " PG_VERSION "\n"
 144
 145 #ifdef EXEC_BACKEND
 146 /* Disable ASLR before exec, for developer builds only (in exec.c) */
 147 extern int      pg_disable_aslr(void);
 148 #endif
 149
 150
 151 #if defined(WIN32) || defined(__CYGWIN__)
 152 #define EXE ".exe"
 153 #else
 154 #define EXE ""
 155 #endif
 156
 157 #if defined(WIN32) && !defined(__CYGWIN__)
 158 #define DEVNULL "nul"
 159 #else
 160 #define DEVNULL "/dev/null"
 161 #endif
 162
 163 /* Portable delay handling */
 164 extern void pg_usleep(long microsec);
 165
 166 /* Portable SQL-like case-independent comparisons and conversions */
 167 extern int      pg_strcasecmp(const char *s1, const char *s2);
 168 extern int      pg_strncasecmp(const char *s1, const char *s2, size_t n);
 169 extern unsigned char pg_toupper(unsigned char ch);
 170 extern unsigned char pg_tolower(unsigned char ch);
 171 extern unsigned char pg_ascii_toupper(unsigned char ch);
 172 extern unsigned char pg_ascii_tolower(unsigned char ch);
 173
 174 /*
 175  * Beginning in v12, we always replace snprintf() and friends with our own
 176  * implementation.  This symbol is no longer consulted by the core code,
 177  * but keep it defined anyway in case any extensions are looking at it.
 178  */
 179 #define USE_REPL_SNPRINTF 1
 180
 181 /*
 182  * Versions of libintl >= 0.13 try to replace printf() and friends with
 183  * macros to their own versions that understand the %$ format.  We do the
 184  * same, so disable their macros, if they exist.
 185  */
 186 #ifdef vsnprintf
 187 #undef vsnprintf
 188 #endif
 189 #ifdef snprintf
 190 #undef snprintf
 191 #endif
 192 #ifdef vsprintf
 193 #undef vsprintf
 194 #endif
 195 #ifdef sprintf
 196 #undef sprintf
 197 #endif
 198 #ifdef vfprintf
 199 #undef vfprintf
 200 #endif
 201 #ifdef fprintf
 202 #undef fprintf
 203 #endif
 204 #ifdef vprintf
 205 #undef vprintf
 206 #endif
 207 #ifdef printf
 208 #undef printf
 209 #endif
 210
 211 extern int      pg_vsnprintf(char *str, size_t count, const char *fmt, va_list args) pg_attribute_printf(3, 0);
 212 extern int      pg_snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3, 4);
 213 extern int      pg_vsprintf(char *str, const char *fmt, va_list args) pg_attribute_printf(2, 0);
 214 extern int      pg_sprintf(char *str, const char *fmt,...) pg_attribute_printf(2, 3);
 215 extern int      pg_vfprintf(FILE *stream, const char *fmt, va_list args) pg_attribute_printf(2, 0);
 216 extern int      pg_fprintf(FILE *stream, const char *fmt,...) pg_attribute_printf(2, 3);
 217 extern int      pg_vprintf(const char *fmt, va_list args) pg_attribute_printf(1, 0);
 218 extern int      pg_printf(const char *fmt,...) pg_attribute_printf(1, 2);
 219
 220 #ifndef WIN32
 221 /*
 222  * We add a pg_ prefix as a warning that the Windows implementations have the
 223  * non-standard side-effect of changing the current file position.
 224  */
 225 #define pg_pread pread
 226 #define pg_pwrite pwrite
 227 #endif
 228
 229 /*
 230  * We use __VA_ARGS__ for printf to prevent replacing references to
 231  * the "printf" format archetype in format() attribute declarations.
 232  * That unfortunately means that taking a function pointer to printf
 233  * will not do what we'd wish.  (If you need to do that, you must name
 234  * pg_printf explicitly.)  For printf's sibling functions, use
 235  * parameterless macros so that function pointers will work unsurprisingly.
 236  */
 237 #define vsnprintf               pg_vsnprintf
 238 #define snprintf                pg_snprintf
 239 #define vsprintf                pg_vsprintf
 240 #define sprintf                 pg_sprintf
 241 #define vfprintf                pg_vfprintf
 242 #define fprintf                 pg_fprintf
 243 #define vprintf                 pg_vprintf
 244 #define printf(...)             pg_printf(__VA_ARGS__)
 245
 246 /* This is also provided by snprintf.c */
 247 extern int      pg_strfromd(char *str, size_t count, int precision, double value);
 248
 249 /* Replace strerror() with our own, somewhat more robust wrapper */
 250 extern char *pg_strerror(int errnum);
 251 #define strerror pg_strerror
 252
 253 /* Likewise for strerror_r(); note we prefer the GNU API for that */
 254 extern char *pg_strerror_r(int errnum, char *buf, size_t buflen);
 255 #define strerror_r pg_strerror_r
 256 #define PG_STRERROR_R_BUFLEN 256        /* Recommended buffer size for strerror_r */
 257
 258 /* Wrap strsignal(), or provide our own version if necessary */
 259 extern const char *pg_strsignal(int signum);
 260
 261 extern int      pclose_check(FILE *stream);
 262
 263 /* Global variable holding time zone information. */
 264 #if defined(WIN32) || defined(__CYGWIN__)
 265 #define TIMEZONE_GLOBAL _timezone
 266 #define TZNAME_GLOBAL _tzname
 267 #else
 268 #define TIMEZONE_GLOBAL timezone
 269 #define TZNAME_GLOBAL tzname
 270 #endif
 271
 272 #if defined(WIN32) || defined(__CYGWIN__)
 273 /*
 274  *      Win32 doesn't have reliable rename/unlink during concurrent access.
 275  */
 276 extern int      pgrename(const char *from, const char *to);
 277 extern int      pgunlink(const char *path);
 278
 279 /* Include this first so later includes don't see these defines */
 280 #ifdef _MSC_VER
 281 #include <io.h>
 282 #endif
 283
 284 #define rename(from, to)                pgrename(from, to)
 285 #define unlink(path)                    pgunlink(path)
 286 #endif                                                  /* defined(WIN32) || defined(__CYGWIN__) */
 287
 288 /*
 289  *      Win32 also doesn't have symlinks, but we can emulate them with
 290  *      junction points on newer Win32 versions.
 291  *
 292  *      Cygwin has its own symlinks which work on Win95/98/ME where
 293  *      junction points don't, so use those instead.  We have no way of
 294  *      knowing what type of system Cygwin binaries will be run on.
 295  *              Note: Some CYGWIN includes might #define WIN32.
 296  */
 297 #if defined(WIN32) && !defined(__CYGWIN__)
 298 extern int      pgsymlink(const char *oldpath, const char *newpath);
 299 extern int      pgreadlink(const char *path, char *buf, size_t size);
 300
 301 #define symlink(oldpath, newpath)       pgsymlink(oldpath, newpath)
 302 #define readlink(path, buf, size)       pgreadlink(path, buf, size)
 303 #endif
 304
 305 extern bool rmtree(const char *path, bool rmtopdir);
 306
 307 #if defined(WIN32) && !defined(__CYGWIN__)
 308
 309 /*
 310  * open() and fopen() replacements to allow deletion of open files and
 311  * passing of other special options.
 312  */
 313 #define         O_DIRECT        0x80000000
 314 extern HANDLE pgwin32_open_handle(const char *, int, bool);
 315 extern int      pgwin32_open(const char *, int,...);
 316 extern FILE *pgwin32_fopen(const char *, const char *);
 317 #define         open(a,b,c) pgwin32_open(a,b,c)
 318 #define         fopen(a,b) pgwin32_fopen(a,b)
 319
 320 /*
 321  * Mingw-w64 headers #define popen and pclose to _popen and _pclose.  We want
 322  * to use our popen wrapper, rather than plain _popen, so override that.  For
 323  * consistency, use our version of pclose, too.
 324  */
 325 #ifdef popen
 326 #undef popen
 327 #endif
 328 #ifdef pclose
 329 #undef pclose
 330 #endif
 331
 332 /*
 333  * system() and popen() replacements to enclose the command in an extra
 334  * pair of quotes.
 335  */
 336 extern int      pgwin32_system(const char *command);
 337 extern FILE *pgwin32_popen(const char *command, const char *type);
 338
 339 #define system(a) pgwin32_system(a)
 340 #define popen(a,b) pgwin32_popen(a,b)
 341 #define pclose(a) _pclose(a)
 342
 343 #else                                                   /* !WIN32 */
 344
 345 /*
 346  *      Win32 requires a special close for sockets and pipes, while on Unix
 347  *      close() does them all.
 348  */
 349 #define closesocket close
 350 #endif                                                  /* WIN32 */
 351
 352 /*
 353  * On Windows, setvbuf() does not support _IOLBF mode, and interprets that
 354  * as _IOFBF.  To add insult to injury, setvbuf(file, NULL, _IOFBF, 0)
 355  * crashes outright if "parameter validation" is enabled.  Therefore, in
 356  * places where we'd like to select line-buffered mode, we fall back to
 357  * unbuffered mode instead on Windows.  Always use PG_IOLBF not _IOLBF
 358  * directly in order to implement this behavior.
 359  */
 360 #ifndef WIN32
 361 #define PG_IOLBF        _IOLBF
 362 #else
 363 #define PG_IOLBF        _IONBF
 364 #endif
 365
 366 /*
 367  * Default "extern" declarations or macro substitutes for library routines.
 368  * When necessary, these routines are provided by files in src/port/.
 369  */
 370
 371 /* Type to use with fseeko/ftello */
 372 #ifndef WIN32                                   /* WIN32 is handled in port/win32_port.h */
 373 #define pgoff_t off_t
 374 #endif
 375
 376 #ifndef HAVE_GETPEEREID
 377 /* On Windows, Perl might have incompatible definitions of uid_t and gid_t. */
 378 #ifndef PLPERL_HAVE_UID_GID
 379 extern int      getpeereid(int sock, uid_t *uid, gid_t *gid);
 380 #endif
 381 #endif
 382
 383 /*
 384  * Glibc doesn't use the builtin for clang due to a *gcc* bug in a version
 385  * newer than the gcc compatibility clang claims to have. This would cause a
 386  * *lot* of superfluous function calls, therefore revert when using clang. In
 387  * C++ there's issues with libc++ (not libstdc++), so disable as well.
 388  */
 389 #if defined(__clang__) && !defined(__cplusplus)
 390 /* needs to be separate to not confuse other compilers */
 391 #if __has_builtin(__builtin_isinf)
 392 /* need to include before, to avoid getting overwritten */
 393 #include <math.h>
 394 #undef isinf
 395 #define isinf __builtin_isinf
 396 #endif                                                  /* __has_builtin(isinf) */
 397 #endif                                                  /* __clang__ && !__cplusplus */
 398
 399 #ifndef HAVE_EXPLICIT_BZERO
 400 extern void explicit_bzero(void *buf, size_t len);
 401 #endif
 402
 403 #ifdef HAVE_BUGGY_STRTOF
 404 extern float pg_strtof(const char *nptr, char **endptr);
 405 #define strtof(a,b) (pg_strtof((a),(b)))
 406 #endif
 407
 408 #ifdef WIN32
 409 /* src/port/win32link.c */
 410 extern int      link(const char *src, const char *dst);
 411 #endif
 412
 413 #ifndef HAVE_MKDTEMP
 414 extern char *mkdtemp(char *path);
 415 #endif
 416
 417 #ifndef HAVE_INET_ATON
 418 #include <netinet/in.h>
 419 #include <arpa/inet.h>
 420 extern int      inet_aton(const char *cp, struct in_addr *addr);
 421 #endif
 422
 423 #if !HAVE_DECL_STRLCAT
 424 extern size_t strlcat(char *dst, const char *src, size_t siz);
 425 #endif
 426
 427 #if !HAVE_DECL_STRLCPY
 428 extern size_t strlcpy(char *dst, const char *src, size_t siz);
 429 #endif
 430
 431 #if !HAVE_DECL_STRNLEN
 432 extern size_t strnlen(const char *str, size_t maxlen);
 433 #endif
 434
 435 /* port/user.c */
 436 #ifndef WIN32
 437 extern bool pg_get_user_name(uid_t user_id, char *buffer, size_t buflen);
 438 extern bool pg_get_user_home_dir(uid_t user_id, char *buffer, size_t buflen);
 439 #endif
 440
 441 extern void pg_qsort(void *base, size_t nel, size_t elsize,
 442                                          int (*cmp) (const void *, const void *));
 443 extern int      pg_qsort_strcmp(const void *a, const void *b);
 444
 445 #define qsort(a,b,c,d) pg_qsort(a,b,c,d)
 446
 447 typedef int (*qsort_arg_comparator) (const void *a, const void *b, void *arg);
 448
 449 extern void qsort_arg(void *base, size_t nel, size_t elsize,
 450                                           qsort_arg_comparator cmp, void *arg);
 451
 452 extern void qsort_interruptible(void *base, size_t nel, size_t elsize,
 453                                                                 qsort_arg_comparator cmp, void *arg);
 454
 455 extern void *bsearch_arg(const void *key, const void *base0,
 456                                                  size_t nmemb, size_t size,
 457                                                  int (*compar) (const void *, const void *, void *),
 458                                                  void *arg);
 459
 460 /* port/chklocale.c */
 461 extern int      pg_get_encoding_from_locale(const char *ctype, bool write_message);
 462
 463 #if defined(WIN32) && !defined(FRONTEND)
 464 extern int      pg_codepage_to_encoding(UINT cp);
 465 #endif
 466
 467 /* port/inet_net_ntop.c */
 468 extern char *pg_inet_net_ntop(int af, const void *src, int bits,
 469                                                           char *dst, size_t size);
 470
 471 /* port/pg_strong_random.c */
 472 extern void pg_strong_random_init(void);
 473 extern bool pg_strong_random(void *buf, size_t len);
 474
 475 /*
 476  * pg_backend_random used to be a wrapper for pg_strong_random before
 477  * Postgres 12 for the backend code.
 478  */
 479 #define pg_backend_random pg_strong_random
 480
 481 /* port/pgcheckdir.c */
 482 extern int      pg_check_dir(const char *dir);
 483
 484 /* port/pgmkdirp.c */
 485 extern int      pg_mkdir_p(char *path, int omode);
 486
 487 /* port/pqsignal.c */
 488 typedef void (*pqsigfunc) (SIGNAL_ARGS);
 489 extern pqsigfunc pqsignal(int signo, pqsigfunc func);
 490
 491 /* port/quotes.c */
 492 extern char *escape_single_quotes_ascii(const char *src);
 493
 494 /* common/wait_error.c */
 495 extern char *wait_result_to_str(int exitstatus);
 496 extern bool wait_result_is_signal(int exit_status, int signum);
 497 extern bool wait_result_is_any_signal(int exit_status, bool include_command_not_found);
 498 extern int      wait_result_to_exit_code(int exit_status);
 499
 500 /*
 501  * Interfaces that we assume all Unix system have.  We retain individual macros
 502  * for better documentation.
 503  *
 504  * For symlink-related functions, there is often no need to test these macros,
 505  * because we provided basic support on Windows that can work with absolute
 506  * paths to directories.  Code that wants to test for complete symlink support
 507  * (including relative paths and non-directories) should be conditional on
 508  * HAVE_READLINK or HAVE_SYMLINK.
 509  */
 510 #ifndef WIN32
 511 #define HAVE_GETRLIMIT 1
 512 #define HAVE_POLL 1
 513 #define HAVE_POLL_H 1
 514 #define HAVE_READLINK 1
 515 #define HAVE_SETSID 1
 516 #define HAVE_SHM_OPEN 1
 517 #define HAVE_SYMLINK 1
 518 #endif
 519
 520 #endif                                                  /* PG_PORT_H */