text: /*-------------------------------------------------------------------------
   *
   * port.h
   *	  Header for src/port/ compatibility functions.
   *
   * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
   * Portions Copyright (c) 1994, Regents of the University of California
   *
   * src/include/port.h
   *
   *-------------------------------------------------------------------------
   */
  #ifndef PG_PORT_H
  #define PG_PORT_H
  
  #include <ctype.h>
  #include <netdb.h>
  #include <pwd.h>
  
  /*
   * Windows has enough specialized port stuff that we push most of it off
   * into another file.
   * Note: Some CYGWIN includes might #define WIN32.
   */
  #if defined(WIN32) && !defined(__CYGWIN__)
  #include "port/win32_port.h"
  #endif
  
  /* socket has a different definition on WIN32 */
  #ifndef WIN32
  typedef int pgsocket;
  
  #define PGINVALID_SOCKET (-1)
  #else
  typedef SOCKET pgsocket;
  
  #define PGINVALID_SOCKET INVALID_SOCKET
  #endif
  
  /* non-blocking */
  extern bool pg_set_noblock(pgsocket sock);
  extern bool pg_set_block(pgsocket sock);
  
  /* Portable path handling for Unix/Win32 (in path.c) */
  
  extern bool has_drive_prefix(const char *filename);
  extern char *first_dir_separator(const char *filename);
  extern char *last_dir_separator(const char *filename);
  extern char *first_path_var_separator(const char *pathlist);
  extern void join_path_components(char *ret_path,
  								 const char *head, const char *tail);
  extern void canonicalize_path(char *path);
  extern void make_native_path(char *path);
  extern void cleanup_path(char *path);
  extern bool path_contains_parent_reference(const char *path);
  extern bool path_is_relative_and_below_cwd(const char *path);
  extern bool path_is_prefix_of_path(const char *path1, const char *path2);
  extern char *make_absolute_path(const char *path);
  extern const char *get_progname(const char *argv0);
  extern void get_share_path(const char *my_exec_path, char *ret_path);
  extern void get_etc_path(const char *my_exec_path, char *ret_path);
  extern void get_include_path(const char *my_exec_path, char *ret_path);
  extern void get_pkginclude_path(const char *my_exec_path, char *ret_path);
  extern void get_includeserver_path(const char *my_exec_path, char *ret_path);
  extern void get_lib_path(const char *my_exec_path, char *ret_path);
  extern void get_pkglib_path(const char *my_exec_path, char *ret_path);
  extern void get_locale_path(const char *my_exec_path, char *ret_path);
  extern void get_doc_path(const char *my_exec_path, char *ret_path);
  extern void get_html_path(const char *my_exec_path, char *ret_path);
  extern void get_man_path(const char *my_exec_path, char *ret_path);
  extern bool get_home_path(char *ret_path);
  extern void get_parent_directory(char *path);
  
  /* common/pgfnames.c */
  extern char **pgfnames(const char *path);
  extern void pgfnames_cleanup(char **filenames);
  
  /*
   *	is_absolute_path
   *
   *	By making this a macro we avoid needing to include path.c in libpq.
   */
  #ifndef WIN32
  #define IS_DIR_SEP(ch)	((ch) == '/')
  
  #define is_absolute_path(filename) \
  ( \
  	IS_DIR_SEP((filename)[0]) \
  )
  #else
  #define IS_DIR_SEP(ch)	((ch) == '/' || (ch) == '\\')
  
  /* See path_is_relative_and_below_cwd() for how we handle 'E:abc'. */
  #define is_absolute_path(filename) \
  ( \
  	IS_DIR_SEP((filename)[0]) || \
  	(isalpha((unsigned char) ((filename)[0])) && (filename)[1] == ':' && \
  	 IS_DIR_SEP((filename)[2])) \
  )
  #endif
  
  
  /* Portable locale initialization (in exec.c) */
  extern void set_pglocale_pgservice(const char *argv0, const char *app);
  
  /* Portable way to find binaries (in exec.c) */
  extern int	find_my_exec(const char *argv0, char *retpath);
  extern int	find_other_exec(const char *argv0, const char *target,
  							const char *versionstr, char *retpath);
  
  /* Doesn't belong here, but this is used with find_other_exec(), so... */
  #define PG_VERSIONSTR "postgres (Greenplum Database) " PG_VERSION "\n"
  #define PG_BACKEND_VERSIONSTR "postgres (Greenplum Database) " PG_VERSION "\n"
  
  
  #if defined(WIN32) || defined(__CYGWIN__)
  #define EXE ".exe"
  #else
  #define EXE ""
  #endif
  
  #if defined(WIN32) && !defined(__CYGWIN__)
  #define DEVNULL "nul"
  #else
  #define DEVNULL "/dev/null"
  #endif
  
  /* Portable delay handling */
  extern void pg_usleep(long microsec);
  
  /* Portable SQL-like case-independent comparisons and conversions */
  extern int	pg_strcasecmp(const char *s1, const char *s2);
  extern int	pg_strncasecmp(const char *s1, const char *s2, size_t n);
  extern unsigned char pg_toupper(unsigned char ch);
  extern unsigned char pg_tolower(unsigned char ch);
  extern unsigned char pg_ascii_toupper(unsigned char ch);
  extern unsigned char pg_ascii_tolower(unsigned char ch);
  
  /*
   * Beginning in v12, we always replace snprintf() and friends with our own
   * implementation.  This symbol is no longer consulted by the core code,
   * but keep it defined anyway in case any extensions are looking at it.
   */
  #define USE_REPL_SNPRINTF 1
  
  /*
   * Versions of libintl >= 0.13 try to replace printf() and friends with
   * macros to their own versions that understand the %$ format.  We do the
   * same, so disable their macros, if they exist.
   */
  #ifdef vsnprintf
  #undef vsnprintf
  #endif
  #ifdef snprintf
  #undef snprintf
  #endif
  #ifdef vsprintf
  #undef vsprintf
  #endif
  #ifdef sprintf
  #undef sprintf
  #endif
  #ifdef vfprintf
  #undef vfprintf
  #endif
  #ifdef fprintf
  #undef fprintf
  #endif
  #ifdef vprintf
  #undef vprintf
  #endif
  #ifdef printf
  #undef printf
  #endif
  
  extern int	pg_vsnprintf(char *str, size_t count, const char *fmt, va_list args);
  extern int	pg_snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3, 4);
  extern int	pg_vsprintf(char *str, const char *fmt, va_list args);
  extern int	pg_sprintf(char *str, const char *fmt,...) pg_attribute_printf(2, 3);
  extern int	pg_vfprintf(FILE *stream, const char *fmt, va_list args);
  extern int	pg_fprintf(FILE *stream, const char *fmt,...) pg_attribute_printf(2, 3);
  extern int	pg_vprintf(const char *fmt, va_list args);
  extern int	pg_printf(const char *fmt,...) pg_attribute_printf(1, 2);
  
  /*
   * We use __VA_ARGS__ for printf to prevent replacing references to
   * the "printf" format archetype in format() attribute declarations.
   * That unfortunately means that taking a function pointer to printf
   * will not do what we'd wish.  (If you need to do that, you must name
   * pg_printf explicitly.)  For printf's sibling functions, use
   * parameterless macros so that function pointers will work unsurprisingly.
   */
  #define vsnprintf		pg_vsnprintf
  #define snprintf		pg_snprintf
  #define vsprintf		pg_vsprintf
  #define sprintf			pg_sprintf
  #define vfprintf		pg_vfprintf
  #define fprintf			pg_fprintf
  #define vprintf			pg_vprintf
  #define printf(...)		pg_printf(__VA_ARGS__)
  
  /* This is also provided by snprintf.c */
  extern int	pg_strfromd(char *str, size_t count, int precision, double value);
  
  /* Replace strerror() with our own, somewhat more robust wrapper */
  extern char *pg_strerror(int errnum);
  #define strerror pg_strerror
  
  /* Likewise for strerror_r(); note we prefer the GNU API for that */
  extern char *pg_strerror_r(int errnum, char *buf, size_t buflen);
  #define strerror_r pg_strerror_r
  #define PG_STRERROR_R_BUFLEN 256	/* Recommended buffer size for strerror_r */
  
  /* Wrap strsignal(), or provide our own version if necessary */
  extern const char *pg_strsignal(int signum);
  
  /* Portable prompt handling */
  extern void simple_prompt(const char *prompt, char *destination, size_t destlen,
  						  bool echo);
  
  extern int	pclose_check(FILE *stream);
  
  /* Global variable holding time zone information. */
  #if defined(WIN32) || defined(__CYGWIN__)
  #define TIMEZONE_GLOBAL _timezone
  #define TZNAME_GLOBAL _tzname
  #else
  #define TIMEZONE_GLOBAL timezone
  #define TZNAME_GLOBAL tzname
  #endif
  
  #if defined(WIN32) || defined(__CYGWIN__)
  /*
   *	Win32 doesn't have reliable rename/unlink during concurrent access.
   */
  extern int	pgrename(const char *from, const char *to);
  extern int	pgunlink(const char *path);
  
  /* Include this first so later includes don't see these defines */
  #ifdef _MSC_VER
  #include <io.h>
  #endif
  
  #define rename(from, to)		pgrename(from, to)
  #define unlink(path)			pgunlink(path)
  #endif							/* defined(WIN32) || defined(__CYGWIN__) */
  
  /*
   *	Win32 also doesn't have symlinks, but we can emulate them with
   *	junction points on newer Win32 versions.
   *
   *	Cygwin has its own symlinks which work on Win95/98/ME where
   *	junction points don't, so use those instead.  We have no way of
   *	knowing what type of system Cygwin binaries will be run on.
   *		Note: Some CYGWIN includes might #define WIN32.
   */
  #if defined(WIN32) && !defined(__CYGWIN__)
  extern int	pgsymlink(const char *oldpath, const char *newpath);
  extern int	pgreadlink(const char *path, char *buf, size_t size);
  extern bool pgwin32_is_junction(const char *path);
  
  #define symlink(oldpath, newpath)	pgsymlink(oldpath, newpath)
  #define readlink(path, buf, size)	pgreadlink(path, buf, size)
  #endif
  
  extern bool rmtree(const char *path, bool rmtopdir);
  
  #if defined(WIN32) && !defined(__CYGWIN__)
  
  /*
   * open() and fopen() replacements to allow deletion of open files and
   * passing of other special options.
   */
  #define		O_DIRECT	0x80000000
  extern int	pgwin32_open(const char *, int,...);
  extern FILE *pgwin32_fopen(const char *, const char *);
  #define		open(a,b,c) pgwin32_open(a,b,c)
  #define		fopen(a,b) pgwin32_fopen(a,b)
  
  /*
   * Mingw-w64 headers #define popen and pclose to _popen and _pclose.  We want
   * to use our popen wrapper, rather than plain _popen, so override that.  For
   * consistency, use our version of pclose, too.
   */
  #ifdef popen
  #undef popen
  #endif
  #ifdef pclose
  #undef pclose
  #endif
  
  /*
   * system() and popen() replacements to enclose the command in an extra
   * pair of quotes.
   */
  extern int	pgwin32_system(const char *command);
  extern FILE *pgwin32_popen(const char *command, const char *type);
  
  #define system(a) pgwin32_system(a)
  #define popen(a,b) pgwin32_popen(a,b)
  #define pclose(a) _pclose(a)
  
  /* New versions of MingW have gettimeofday, old mingw and msvc don't */
  #ifndef HAVE_GETTIMEOFDAY
  /* Last parameter not used */
  extern int	gettimeofday(struct timeval *tp, struct timezone *tzp);
  #endif
  #else							/* !WIN32 */
  
  /*
   *	Win32 requires a special close for sockets and pipes, while on Unix
   *	close() does them all.
   */
  #define closesocket close
  #endif							/* WIN32 */
  
  /*
   * On Windows, setvbuf() does not support _IOLBF mode, and interprets that
   * as _IOFBF.  To add insult to injury, setvbuf(file, NULL, _IOFBF, 0)
   * crashes outright if "parameter validation" is enabled.  Therefore, in
   * places where we'd like to select line-buffered mode, we fall back to
   * unbuffered mode instead on Windows.  Always use PG_IOLBF not _IOLBF
   * directly in order to implement this behavior.
   */
  #ifndef WIN32
  #define PG_IOLBF	_IOLBF
  #else
  #define PG_IOLBF	_IONBF
  #endif
  
  /*
   * Default "extern" declarations or macro substitutes for library routines.
   * When necessary, these routines are provided by files in src/port/.
   */
  #ifndef HAVE_CRYPT
  extern char *crypt(const char *key, const char *setting);
  #endif
  
  /* WIN32 handled in port/win32_port.h */
  #ifndef WIN32
  #define pgoff_t off_t
  #ifdef __NetBSD__
  extern int	fseeko(FILE *stream, off_t offset, int whence);
  extern off_t ftello(FILE *stream);
  #endif
  #endif
  
  extern double pg_erand48(unsigned short xseed[3]);
  extern long pg_lrand48(void);
  extern long pg_jrand48(unsigned short xseed[3]);
  extern void pg_srand48(long seed);
  
  #ifndef HAVE_FLS
  extern int	fls(int mask);
  #endif
  
  #ifndef HAVE_FSEEKO
  #define fseeko(a, b, c) fseek(a, b, c)
  #define ftello(a)		ftell(a)
  #endif
  
  #if !defined(HAVE_GETPEEREID) && !defined(WIN32)
  extern int	getpeereid(int sock, uid_t *uid, gid_t *gid);
  #endif
  
  #ifndef HAVE_ISINF
  extern int	isinf(double x);
  #else
  /*
   * Glibc doesn't use the builtin for clang due to a *gcc* bug in a version
   * newer than the gcc compatibility clang claims to have. This would cause a
   * *lot* of superfluous function calls, therefore revert when using clang. In
   * C++ there's issues with libc++ (not libstdc++), so disable as well.
   */
  #if defined(__clang__) && !defined(__cplusplus)
  /* needs to be separate to not confuse other compilers */
  #if __has_builtin(__builtin_isinf)
  /* need to include before, to avoid getting overwritten */
  #include <math.h>
  #undef isinf
  #define isinf __builtin_isinf
  #endif							/* __has_builtin(isinf) */
  #endif							/* __clang__ && !__cplusplus */
  #endif							/* !HAVE_ISINF */
  
  #ifndef HAVE_STRTOF
  extern float strtof(const char *nptr, char **endptr);
  #endif
  
  #ifdef HAVE_BUGGY_STRTOF
  extern float pg_strtof(const char *nptr, char **endptr);
  #define strtof(a,b) (pg_strtof((a),(b)))
  #endif
  
  #ifndef HAVE_MKDTEMP
  extern char *mkdtemp(char *path);
  #endif
  
  #ifndef HAVE_RINT
  extern double rint(double x);
  #endif
  
  #ifndef HAVE_INET_ATON
  #include <netinet/in.h>
  #include <arpa/inet.h>
  extern int	inet_aton(const char *cp, struct in_addr *addr);
  #endif
  
  /*
   * Windows and older Unix don't have pread(2) and pwrite(2).  We have
   * replacement functions, but they have slightly different semantics so we'll
   * use a name with a pg_ prefix to avoid confusion.
   */
  #ifdef HAVE_PREAD
  #define pg_pread pread
  #else
  extern ssize_t pg_pread(int fd, void *buf, size_t nbyte, off_t offset);
  #endif
  
  #ifdef HAVE_PWRITE
  #define pg_pwrite pwrite
  #else
  extern ssize_t pg_pwrite(int fd, const void *buf, size_t nbyte, off_t offset);
  #endif
  
  #if !HAVE_DECL_STRLCAT
  extern size_t strlcat(char *dst, const char *src, size_t siz);
  #endif
  
  #if !HAVE_DECL_STRLCPY
  extern size_t strlcpy(char *dst, const char *src, size_t siz);
  #endif
  
  #if !HAVE_DECL_STRNLEN
  extern size_t strnlen(const char *str, size_t maxlen);
  #endif
  
  #if !defined(HAVE_RANDOM)
  extern long random(void);
  #endif
  
  #ifndef HAVE_UNSETENV
  extern void unsetenv(const char *name);
  #endif
  
  #ifndef HAVE_SRANDOM
  extern void srandom(unsigned int seed);
  #endif
  
  #ifndef HAVE_SSL_GET_CURRENT_COMPRESSION
  #define SSL_get_current_compression(x) 0
  #endif
  
  #ifndef HAVE_DLOPEN
  extern void *dlopen(const char *file, int mode);
  extern void *dlsym(void *handle, const char *symbol);
  extern int	dlclose(void *handle);
  extern char *dlerror(void);
  #endif
  
  /*
   * In some older systems, the RTLD_NOW flag isn't defined and the mode
   * argument to dlopen must always be 1.
   */
  #if !HAVE_DECL_RTLD_NOW
  #define RTLD_NOW 1
  #endif
  
  /*
   * The RTLD_GLOBAL flag is wanted if available, but it doesn't exist
   * everywhere.  If it doesn't exist, set it to 0 so it has no effect.
   */
  #if !HAVE_DECL_RTLD_GLOBAL
  #define RTLD_GLOBAL 0
  #endif
  
  /* thread.h */
  #ifndef WIN32
  extern int	pqGetpwuid(uid_t uid, struct passwd *resultbuf, char *buffer,
  					   size_t buflen, struct passwd **result);
  #endif
  
  extern int	pqGethostbyname(const char *name,
  							struct hostent *resultbuf,
  							char *buffer, size_t buflen,
  							struct hostent **result,
  							int *herrno);
  
  extern void pg_qsort(void *base, size_t nel, size_t elsize,
  					 int (*cmp) (const void *, const void *));
  extern int	pg_qsort_strcmp(const void *a, const void *b);
  
  #define qsort(a,b,c,d) pg_qsort(a,b,c,d)
  
  typedef int (*qsort_arg_comparator) (const void *a, const void *b, void *arg);
  
  extern void qsort_arg(void *base, size_t nel, size_t elsize,
  					  qsort_arg_comparator cmp, void *arg);
  
  /* port/chklocale.c */
  extern int	pg_get_encoding_from_locale(const char *ctype, bool write_message);
  
  #if defined(WIN32) && !defined(FRONTEND)
  extern int	pg_codepage_to_encoding(UINT cp);
  #endif
  
  /* port/inet_net_ntop.c */
  extern char *inet_net_ntop(int af, const void *src, int bits,
  						   char *dst, size_t size);
  
  /* port/pg_strong_random.c */
  extern bool pg_strong_random(void *buf, size_t len);
  
  /*
   * pg_backend_random used to be a wrapper for pg_strong_random before
   * Postgres 12 for the backend code.
   */
  #define pg_backend_random pg_strong_random
  
  /* port/pgcheckdir.c */
  extern int	pg_check_dir(const char *dir);
  
  /* port/pgmkdirp.c */
  extern int	pg_mkdir_p(char *path, int omode);
  
  /* port/pqsignal.c */
  typedef void (*pqsigfunc) (int signo);
  extern pqsigfunc pqsignal(int signo, pqsigfunc func);
  #ifndef WIN32
  extern pqsigfunc pqsignal_no_restart(int signo, pqsigfunc func);
  #else
  #define pqsignal_no_restart(signo, func) pqsignal(signo, func)
  #endif
  
  /* port/quotes.c */
  extern char *escape_single_quotes_ascii(const char *src);
  
  /* common/wait_error.c */
  extern char *wait_result_to_str(int exit_status);
  extern bool wait_result_is_signal(int exit_status, int signum);
  extern bool wait_result_is_any_signal(int exit_status, bool include_command_not_found);
  
  #endif							/* PG_PORT_H */
  