/*------------------------------------------------------------------------- * * elog.h * POSTGRES error reporting/logging definitions. * * * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/include/utils/elog.h * *------------------------------------------------------------------------- */ #ifndef ELOG_H #define ELOG_H #include /* Error level codes */ #define DEBUG5 10 /* Debugging messages, in categories of * decreasing detail. */ #define DEBUG4 11 #define DEBUG3 12 #define DEBUG2 13 #define DEBUG1 14 /* used by GUC debug_* variables */ #define LOG 15 /* Server operational messages; sent only to * server log by default. */ #define LOG_SERVER_ONLY 16 /* Same as LOG for server reporting, but never * sent to client. */ #define COMMERROR LOG_SERVER_ONLY /* Client communication problems; same as * LOG for server reporting, but never * sent to client. */ #define INFO 17 /* Messages specifically requested by user (eg * VACUUM VERBOSE output); always sent to * client regardless of client_min_messages, * but by default not sent to server log. */ #define NOTICE 18 /* Helpful messages to users about query * operation; sent to client and not to server * log by default. */ #define WARNING 19 /* Warnings. NOTICE is for expected messages * like implicit sequence creation by SERIAL. * WARNING is for unexpected messages. */ #define PGWARNING 19 /* Must equal WARNING; see NOTE below. */ #define WARNING_CLIENT_ONLY 20 /* Warnings to be sent to client as usual, but * never to the server log. */ #define ERROR 21 /* user error - abort transaction; return to * known state */ #define PGERROR 21 /* Must equal ERROR; see NOTE below. */ #define FATAL 22 /* fatal error - abort process */ #define PANIC 23 /* take down the other backends with me */ /* * NOTE: the alternate names PGWARNING and PGERROR are useful for dealing * with third-party headers that make other definitions of WARNING and/or * ERROR. One can, for example, re-define ERROR as PGERROR after including * such a header. */ /* macros for representing SQLSTATE strings compactly */ #define PGSIXBIT(ch) (((ch) - '0') & 0x3F) #define PGUNSIXBIT(val) (((val) & 0x3F) + '0') #define MAKE_SQLSTATE(ch1,ch2,ch3,ch4,ch5) \ (PGSIXBIT(ch1) + (PGSIXBIT(ch2) << 6) + (PGSIXBIT(ch3) << 12) + \ (PGSIXBIT(ch4) << 18) + (PGSIXBIT(ch5) << 24)) /* These macros depend on the fact that '0' becomes a zero in PGSIXBIT */ #define ERRCODE_TO_CATEGORY(ec) ((ec) & ((1 << 12) - 1)) #define ERRCODE_IS_CATEGORY(ec) (((ec) & ~((1 << 12) - 1)) == 0) /* SQLSTATE codes for errors are defined in a separate file */ #include "utils/errcodes.h" /* * Provide a way to prevent "errno" from being accidentally used inside an * elog() or ereport() invocation. Since we know that some operating systems * define errno as something involving a function call, we'll put a local * variable of the same name as that function in the local scope to force a * compile error. On platforms that don't define errno in that way, nothing * happens, so we get no warning ... but we can live with that as long as it * happens on some popular platforms. */ #if defined(errno) && defined(__linux__) #define pg_prevent_errno_in_scope() int __errno_location pg_attribute_unused() #elif defined(errno) && (defined(__darwin__) || defined(__freebsd__)) #define pg_prevent_errno_in_scope() int __error pg_attribute_unused() #else #define pg_prevent_errno_in_scope() #endif /*---------- * New-style error reporting API: to be used in this way: * ereport(ERROR, * errcode(ERRCODE_UNDEFINED_CURSOR), * errmsg("portal \"%s\" not found", stmt->portalname), * ... other errxxx() fields as needed ...); * * The error level is required, and so is a primary error message (errmsg * or errmsg_internal). All else is optional. errcode() defaults to * ERRCODE_INTERNAL_ERROR if elevel is ERROR or more, ERRCODE_WARNING * if elevel is WARNING, or ERRCODE_SUCCESSFUL_COMPLETION if elevel is * NOTICE or below. * * Before Postgres v12, extra parentheses were required around the * list of auxiliary function calls; that's now optional. * * ereport_domain() allows a message domain to be specified, for modules that * wish to use a different message catalog from the backend's. To avoid having * one copy of the default text domain per .o file, we define it as NULL here * and have errstart insert the default text domain. Modules can either use * ereport_domain() directly, or preferably they can override the TEXTDOMAIN * macro. * * When __builtin_constant_p is available and elevel >= ERROR we make a call * to errstart_cold() instead of errstart(). This version of the function is * marked with pg_attribute_cold which will coax supporting compilers into * generating code which is more optimized towards non-ERROR cases. Because * we use __builtin_constant_p() in the condition, when elevel is not a * compile-time constant, or if it is, but it's < ERROR, the compiler has no * need to generate any code for this branch. It can simply call errstart() * unconditionally. * * If elevel >= ERROR, the call will not return; we try to inform the compiler * of that via pg_unreachable(). However, no useful optimization effect is * obtained unless the compiler sees elevel as a compile-time constant, else * we're just adding code bloat. So, if __builtin_constant_p is available, * use that to cause the second if() to vanish completely for non-constant * cases. We avoid using a local variable because it's not necessary and * prevents gcc from making the unreachability deduction at optlevel -O0. *---------- */ #ifdef HAVE__BUILTIN_CONSTANT_P #define ereport_domain(elevel, domain, ...) \ do { \ pg_prevent_errno_in_scope(); \ if (__builtin_constant_p(elevel) && (elevel) >= ERROR ? \ errstart_cold(elevel, domain) : \ errstart(elevel, domain)) \ __VA_ARGS__, errfinish(__FILE__, __LINE__, PG_FUNCNAME_MACRO); \ if (__builtin_constant_p(elevel) && (elevel) >= ERROR) \ pg_unreachable(); \ } while(0) #else /* !HAVE__BUILTIN_CONSTANT_P */ #define ereport_domain(elevel, domain, ...) \ do { \ const int elevel_ = (elevel); \ pg_prevent_errno_in_scope(); \ if (errstart(elevel_, domain)) \ __VA_ARGS__, errfinish(__FILE__, __LINE__, PG_FUNCNAME_MACRO); \ if (elevel_ >= ERROR) \ pg_unreachable(); \ } while(0) #endif /* HAVE__BUILTIN_CONSTANT_P */ #define ereport(elevel, ...) \ ereport_domain(elevel, TEXTDOMAIN, __VA_ARGS__) #define TEXTDOMAIN NULL extern bool message_level_is_interesting(int elevel); extern bool errstart(int elevel, const char *domain); extern pg_attribute_cold bool errstart_cold(int elevel, const char *domain); extern void errfinish(const char *filename, int lineno, const char *funcname); extern int errcode(int sqlerrcode); extern int errcode_for_file_access(void); extern int errcode_for_socket_access(void); extern int errmsg(const char *fmt,...) pg_attribute_printf(1, 2); extern int errmsg_internal(const char *fmt,...) pg_attribute_printf(1, 2); extern int errmsg_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...) pg_attribute_printf(1, 4) pg_attribute_printf(2, 4); extern int errdetail(const char *fmt,...) pg_attribute_printf(1, 2); extern int errdetail_internal(const char *fmt,...) pg_attribute_printf(1, 2); extern int errdetail_log(const char *fmt,...) pg_attribute_printf(1, 2); extern int errdetail_log_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...) pg_attribute_printf(1, 4) pg_attribute_printf(2, 4); extern int errdetail_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...) pg_attribute_printf(1, 4) pg_attribute_printf(2, 4); extern int errhint(const char *fmt,...) pg_attribute_printf(1, 2); extern int errhint_plural(const char *fmt_singular, const char *fmt_plural, unsigned long n,...) pg_attribute_printf(1, 4) pg_attribute_printf(2, 4); /* * errcontext() is typically called in error context callback functions, not * within an ereport() invocation. The callback function can be in a different * module than the ereport() call, so the message domain passed in errstart() * is not usually the correct domain for translating the context message. * set_errcontext_domain() first sets the domain to be used, and * errcontext_msg() passes the actual message. */ #define errcontext set_errcontext_domain(TEXTDOMAIN), errcontext_msg extern int set_errcontext_domain(const char *domain); extern int errcontext_msg(const char *fmt,...) pg_attribute_printf(1, 2); extern int errhidestmt(bool hide_stmt); extern int errhidecontext(bool hide_ctx); extern int errbacktrace(void); extern int errposition(int cursorpos); extern int internalerrposition(int cursorpos); extern int internalerrquery(const char *query); extern int err_generic_string(int field, const char *str); extern int geterrcode(void); extern int geterrposition(void); extern int getinternalerrposition(void); /*---------- * Old-style error reporting API: to be used in this way: * elog(ERROR, "portal \"%s\" not found", stmt->portalname); *---------- */ #define elog(elevel, ...) \ ereport(elevel, errmsg_internal(__VA_ARGS__)) /* Support for constructing error strings separately from ereport() calls */ extern void pre_format_elog_string(int errnumber, const char *domain); extern char *format_elog_string(const char *fmt,...) pg_attribute_printf(1, 2); /* Support for attaching context information to error reports */ typedef struct ErrorContextCallback { struct ErrorContextCallback *previous; void (*callback) (void *arg); void *arg; } ErrorContextCallback; extern PGDLLIMPORT ErrorContextCallback *error_context_stack; /*---------- * API for catching ereport(ERROR) exits. Use these macros like so: * * PG_TRY(); * { * ... code that might throw ereport(ERROR) ... * } * PG_CATCH(); * { * ... error recovery code ... * } * PG_END_TRY(); * * (The braces are not actually necessary, but are recommended so that * pgindent will indent the construct nicely.) The error recovery code * can either do PG_RE_THROW to propagate the error outwards, or do a * (sub)transaction abort. Failure to do so may leave the system in an * inconsistent state for further processing. * * For the common case that the error recovery code and the cleanup in the * normal code path are identical, the following can be used instead: * * PG_TRY(); * { * ... code that might throw ereport(ERROR) ... * } * PG_FINALLY(); * { * ... cleanup code ... * } * PG_END_TRY(); * * The cleanup code will be run in either case, and any error will be rethrown * afterwards. * * You cannot use both PG_CATCH() and PG_FINALLY() in the same * PG_TRY()/PG_END_TRY() block. * * Note: while the system will correctly propagate any new ereport(ERROR) * occurring in the recovery section, there is a small limit on the number * of levels this will work for. It's best to keep the error recovery * section simple enough that it can't generate any new errors, at least * not before popping the error stack. * * Note: an ereport(FATAL) will not be caught by this construct; control will * exit straight through proc_exit(). Therefore, do NOT put any cleanup * of non-process-local resources into the error recovery section, at least * not without taking thought for what will happen during ereport(FATAL). * The PG_ENSURE_ERROR_CLEANUP macros provided by storage/ipc.h may be * helpful in such cases. * * Note: if a local variable of the function containing PG_TRY is modified * in the PG_TRY section and used in the PG_CATCH section, that variable * must be declared "volatile" for POSIX compliance. This is not mere * pedantry; we have seen bugs from compilers improperly optimizing code * away when such a variable was not marked. Beware that gcc's -Wclobbered * warnings are just about entirely useless for catching such oversights. *---------- */ #define PG_TRY() \ do { \ sigjmp_buf *_save_exception_stack = PG_exception_stack; \ ErrorContextCallback *_save_context_stack = error_context_stack; \ sigjmp_buf _local_sigjmp_buf; \ bool _do_rethrow = false; \ if (sigsetjmp(_local_sigjmp_buf, 0) == 0) \ { \ PG_exception_stack = &_local_sigjmp_buf #define PG_CATCH() \ } \ else \ { \ PG_exception_stack = _save_exception_stack; \ error_context_stack = _save_context_stack #define PG_FINALLY() \ } \ else \ _do_rethrow = true; \ { \ PG_exception_stack = _save_exception_stack; \ error_context_stack = _save_context_stack #define PG_END_TRY() \ } \ if (_do_rethrow) \ PG_RE_THROW(); \ PG_exception_stack = _save_exception_stack; \ error_context_stack = _save_context_stack; \ } while (0) /* * Some compilers understand pg_attribute_noreturn(); for other compilers, * insert pg_unreachable() so that the compiler gets the point. */ #ifdef HAVE_PG_ATTRIBUTE_NORETURN #define PG_RE_THROW() \ pg_re_throw() #else #define PG_RE_THROW() \ (pg_re_throw(), pg_unreachable()) #endif extern PGDLLIMPORT sigjmp_buf *PG_exception_stack; /* Stuff that error handlers might want to use */ /* * ErrorData holds the data accumulated during any one ereport() cycle. * Any non-NULL pointers must point to palloc'd data. * (The const pointers are an exception; we assume they point at non-freeable * constant strings.) */ typedef struct ErrorData { int elevel; /* error level */ bool output_to_server; /* will report to server log? */ bool output_to_client; /* will report to client? */ bool hide_stmt; /* true to prevent STATEMENT: inclusion */ bool hide_ctx; /* true to prevent CONTEXT: inclusion */ const char *filename; /* __FILE__ of ereport() call */ int lineno; /* __LINE__ of ereport() call */ const char *funcname; /* __func__ of ereport() call */ const char *domain; /* message domain */ const char *context_domain; /* message domain for context message */ int sqlerrcode; /* encoded ERRSTATE */ char *message; /* primary error message (translated) */ char *detail; /* detail error message */ char *detail_log; /* detail error message for server log only */ char *hint; /* hint message */ char *context; /* context message */ char *backtrace; /* backtrace */ const char *message_id; /* primary message's id (original string) */ char *schema_name; /* name of schema */ char *table_name; /* name of table */ char *column_name; /* name of column */ char *datatype_name; /* name of datatype */ char *constraint_name; /* name of constraint */ int cursorpos; /* cursor index into query string */ int internalpos; /* cursor index into internalquery */ char *internalquery; /* text of internally-generated query */ int saved_errno; /* errno at entry */ /* context containing associated non-constant strings */ struct MemoryContextData *assoc_context; } ErrorData; extern void EmitErrorReport(void); extern ErrorData *CopyErrorData(void); extern void FreeErrorData(ErrorData *edata); extern void FlushErrorState(void); extern void ReThrowError(ErrorData *edata) pg_attribute_noreturn(); extern void ThrowErrorData(ErrorData *edata); extern void pg_re_throw(void) pg_attribute_noreturn(); extern char *GetErrorContextStack(void); /* Hook for intercepting messages before they are sent to the server log */ typedef void (*emit_log_hook_type) (ErrorData *edata); extern PGDLLIMPORT emit_log_hook_type emit_log_hook; /* GUC-configurable parameters */ typedef enum { PGERROR_TERSE, /* single-line error messages */ PGERROR_DEFAULT, /* recommended style */ PGERROR_VERBOSE /* all the facts, ma'am */ } PGErrorVerbosity; extern int Log_error_verbosity; extern char *Log_line_prefix; extern int Log_destination; extern char *Log_destination_string; extern bool syslog_sequence_numbers; extern bool syslog_split_messages; /* Log destination bitmap */ #define LOG_DESTINATION_STDERR 1 #define LOG_DESTINATION_SYSLOG 2 #define LOG_DESTINATION_EVENTLOG 4 #define LOG_DESTINATION_CSVLOG 8 /* Other exported functions */ extern void DebugFileOpen(void); extern char *unpack_sql_state(int sql_state); extern bool in_error_recursion_trouble(void); #ifdef HAVE_SYSLOG extern void set_syslog_parameters(const char *ident, int facility); #endif /* * Write errors to stderr (or by equal means when stderr is * not available). Used before ereport/elog can be used * safely (memory context, GUC load etc) */ extern void write_stderr(const char *fmt,...) pg_attribute_printf(1, 2); #endif /* ELOG_H */