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/*------------------------------------------------------------------------- * * port.h * Header for src/port/ compatibility functions. * * Portions Copyright (c) 1996-2021, 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 canonicalize_path_enc(char *path, int encoding); 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); #define IS_NONWINDOWS_DIR_SEP(ch) ((ch) == '/') #define is_nonwindows_absolute_path(filename) \ ( \ IS_NONWINDOWS_DIR_SEP((filename)[0]) \ ) #define IS_WINDOWS_DIR_SEP(ch) ((ch) == '/' || (ch) == '\\') /* See path_is_relative_and_below_cwd() for how we handle 'E:abc'. */ #define is_windows_absolute_path(filename) \ ( \ IS_WINDOWS_DIR_SEP((filename)[0]) || \ (isalpha((unsigned char) ((filename)[0])) && (filename)[1] == ':' && \ IS_WINDOWS_DIR_SEP((filename)[2])) \ ) /* * is_absolute_path and IS_DIR_SEP * * By using macros here we avoid needing to include path.c in libpq. */ #ifndef WIN32 #define IS_DIR_SEP(ch) IS_NONWINDOWS_DIR_SEP(ch) #define is_absolute_path(filename) is_nonwindows_absolute_path(filename) #else #define IS_DIR_SEP(ch) IS_WINDOWS_DIR_SEP(ch) #define is_absolute_path(filename) is_windows_absolute_path(filename) #endif /* * This macro provides a centralized list of all errnos that identify * hard failure of a previously-established network connection. * The macro is intended to be used in a switch statement, in the form * "case ALL_CONNECTION_FAILURE_ERRNOS:". * * Note: this groups EPIPE and ECONNRESET, which we take to indicate a * probable server crash, with other errors that indicate loss of network * connectivity without proving much about the server's state. Places that * are actually reporting errors typically single out EPIPE and ECONNRESET, * while allowing the network failures to be reported generically. */ #define ALL_CONNECTION_FAILURE_ERRNOS \ EPIPE: \ case ECONNRESET: \ case ECONNABORTED: \ case EHOSTDOWN: \ case EHOSTUNREACH: \ case ENETDOWN: \ case ENETRESET: \ case ENETUNREACH /* Portable locale initialization (in exec.c) */ extern void set_pglocale_pgservice(const char *argv0, const char *app); /* Portable way to find and execute binaries (in exec.c) */ extern int validate_exec(const char *path); 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); extern char *pipe_read_line(char *cmd, char *line, int maxsize); /* Doesn't belong here, but this is used with find_other_exec(), so... */ #define PG_BACKEND_VERSIONSTR "postgres (PostgreSQL) " PG_VERSION "\n" #ifdef EXEC_BACKEND /* Disable ASLR before exec, for developer builds only (in exec.c) */ extern int pg_disable_aslr(void); #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); /* * 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); 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); #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__) /* * We want the 64-bit variant of lseek(). * * For Visual Studio, this must be after <io.h> to avoid messing up its * lseek() and _lseeki64() function declarations. * * For MinGW there is already a macro, so we have to undefine it (depending on * _FILE_OFFSET_BITS, it may point at its own lseek64, but we don't want to * count on that being set). */ #undef lseek #define lseek(a,b,c) _lseeki64((a),(b),(c)) /* * We want the 64-bit variant of chsize(). It sets errno and also returns it, * so convert non-zero result to -1 to match POSIX. * * Prevent MinGW from declaring functions, and undefine its macro before we * define our own. */ #ifndef _MSC_VER #define FTRUNCATE_DEFINED #include <unistd.h> #undef ftruncate #endif #define ftruncate(a,b) (_chsize_s((a),(b)) == 0 ? 0 : -1) /* * open() and fopen() replacements to allow deletion of open files and * passing of other special options. */ #define O_DIRECT 0x80000000 extern HANDLE pgwin32_open_handle(const char *, int, bool); 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/. */ /* Type to use with fseeko/ftello */ #ifndef WIN32 /* WIN32 is handled in port/win32_port.h */ #define pgoff_t off_t #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_GETPEEREID /* On Windows, Perl might have incompatible definitions of uid_t and gid_t. */ #ifndef PLPERL_HAVE_UID_GID extern int getpeereid(int sock, uid_t *uid, gid_t *gid); #endif #endif /* * 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 */ #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_LINK extern int link(const char *src, const char *dst); #endif #ifndef HAVE_MKDTEMP extern char *mkdtemp(char *path); #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 /* For pg_pwritev() and pg_preadv(), see port/pg_iovec.h. */ #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_SETENV extern int setenv(const char *name, const char *value, int overwrite); #endif #ifndef HAVE_UNSETENV extern int unsetenv(const char *name); #endif #ifndef HAVE_SRANDOM extern void srandom(unsigned int seed); #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); extern void qsort_interruptible(void *base, size_t nel, size_t elsize, qsort_arg_comparator cmp, void *arg); extern void *bsearch_arg(const void *key, const void *base, size_t nmemb, size_t size, int (*compar) (const void *, const void *, void *), 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 void pg_strong_random_init(void); 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 (see also interfaces/libpq/legacy-pqsignal.c) */ #ifdef FRONTEND #define pqsignal pqsignal_fe #endif 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 */