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postgresql/src/include/port.h

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/*-------------------------------------------------------------------------
*
* 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_BACKEND_VERSIONSTR "postgres (PostgreSQL) " 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/.
*/
/* 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_EXPLICIT_BZERO
extern void explicit_bzero(void *buf, size_t len);
#endif
#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 *pg_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);
/* 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 */
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