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Current File : /usr/include/postgresql/9.6/server/port.h
/*-------------------------------------------------------------------------
 *
 * port.h
 *	  Header for src/port/ compatibility functions.
 *
 * Portions Copyright (c) 1996-2016, 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>

/* 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);

/* Windows security token manipulation (in exec.c) */
#ifdef WIN32
extern BOOL AddUserToTokenDacl(HANDLE hToken);
#endif


#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);

#ifdef USE_REPL_SNPRINTF

/*
 * 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 sprintf
#undef sprintf
#endif
#ifdef vfprintf
#undef vfprintf
#endif
#ifdef fprintf
#undef fprintf
#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_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_printf(const char *fmt,...) pg_attribute_printf(1, 2);

/*
 *	The GCC-specific code below prevents the pg_attribute_printf above from
 *	being replaced, and this is required because gcc doesn't know anything
 *	about pg_printf.
 */
#ifdef __GNUC__
#define vsnprintf(...)	pg_vsnprintf(__VA_ARGS__)
#define snprintf(...)	pg_snprintf(__VA_ARGS__)
#define sprintf(...)	pg_sprintf(__VA_ARGS__)
#define vfprintf(...)	pg_vfprintf(__VA_ARGS__)
#define fprintf(...)	pg_fprintf(__VA_ARGS__)
#define printf(...)		pg_printf(__VA_ARGS__)
#else
#define vsnprintf		pg_vsnprintf
#define snprintf		pg_snprintf
#define sprintf			pg_sprintf
#define vfprintf		pg_vfprintf
#define fprintf			pg_fprintf
#define printf			pg_printf
#endif
#endif   /* USE_REPL_SNPRINTF */

#if defined(WIN32)
/*
 * Versions of libintl >= 0.18? try to replace setlocale() with a macro
 * to their own versions.  Remove the macro, if it exists, because it
 * ends up calling the wrong version when the backend and libintl use
 * different versions of msvcrt.
 */
#if defined(setlocale)
#undef setlocale
#endif

/*
 * Define our own wrapper macro around setlocale() to work around bugs in
 * Windows' native setlocale() function.
 */
extern char *pgwin32_setlocale(int category, const char *locale);

#define setlocale(a,b) pgwin32_setlocale(a,b)
#endif   /* WIN32 */

/* Wrap strsignal(), or provide our own version if necessary */
extern const char *pg_strsignal(int signum);

/* Portable prompt handling */
extern char *simple_prompt(const char *prompt, int maxlen, bool echo);

#ifdef WIN32
#define PG_SIGNAL_COUNT 32
#define kill(pid,sig)	pgkill(pid,sig)
extern int	pgkill(int pid, int sig);
#endif

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 WIN32_ONLY_COMPILER
#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(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);

/*
 * stat() is not guaranteed to set the st_size field on win32, so we
 * redefine it to our own implementation that is.
 *
 * We must pull in sys/stat.h here so the system header definition
 * goes in first, and we redefine that, and not the other way around.
 *
 * Some frontends don't need the size from stat, so if UNSAFE_STAT_OK
 * is defined we don't bother with this.
 */
#if defined(WIN32) && !defined(__CYGWIN__) && !defined(UNSAFE_STAT_OK)
#include <sys/stat.h>
extern int	pgwin32_safestat(const char *path, struct stat * buf);

#define stat(a,b) pgwin32_safestat(a,b)
#endif

#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 *);

#ifndef FRONTEND
#define		open(a,b,c) pgwin32_open(a,b,c)
#define		fopen(a,b) pgwin32_fopen(a,b)
#endif

/*
 * 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.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 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);
#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

#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) && !defined(__BORLANDC__)
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

/* thread.h */
extern char *pqStrerror(int errnum, char *strerrbuf, size_t buflen);

#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/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);

/* 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);

#endif   /* PG_PORT_H */

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