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c.h
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libpq
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libpq-int.h
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port.h
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postgres_fe.h
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pqexpbuffer.h
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Editing: libpq-int.h
/*------------------------------------------------------------------------- * * libpq-int.h * This file contains internal definitions meant to be used only by * the frontend libpq library, not by applications that call it. * * An application can include this file if it wants to bypass the * official API defined by libpq-fe.h, but code that does so is much * more likely to break across PostgreSQL releases than code that uses * only the official API. * * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * * src/interfaces/libpq/libpq-int.h * *------------------------------------------------------------------------- */ #ifndef LIBPQ_INT_H #define LIBPQ_INT_H /* We assume libpq-fe.h has already been included. */ #include "postgres_fe.h" #include "libpq-events.h" #include <time.h> #include <sys/types.h> #ifndef WIN32 #include <sys/time.h> #endif #ifdef ENABLE_THREAD_SAFETY #ifdef WIN32 #include "pthread-win32.h" #else #include <pthread.h> #endif #include <signal.h> #endif /* include stuff common to fe and be */ #include "getaddrinfo.h" #include "libpq/pqcomm.h" /* include stuff found in fe only */ #include "pqexpbuffer.h" #ifdef ENABLE_GSS #if defined(HAVE_GSSAPI_H) #include <gssapi.h> #else #include <gssapi/gssapi.h> #endif #endif #ifdef ENABLE_SSPI #define SECURITY_WIN32 #if defined(WIN32) && !defined(WIN32_ONLY_COMPILER) #include <ntsecapi.h> #endif #include <security.h> #undef SECURITY_WIN32 #ifndef ENABLE_GSS /* * Define a fake structure compatible with GSSAPI on Unix. */ typedef struct { void *value; int length; } gss_buffer_desc; #endif #endif /* ENABLE_SSPI */ #ifdef USE_OPENSSL #include <openssl/ssl.h> #include <openssl/err.h> #if (OPENSSL_VERSION_NUMBER >= 0x00907000L) && !defined(OPENSSL_NO_ENGINE) #define USE_SSL_ENGINE #endif #endif /* USE_OPENSSL */ /* * POSTGRES backend dependent Constants. */ #define CMDSTATUS_LEN 64 /* should match COMPLETION_TAG_BUFSIZE */ /* * PGresult and the subsidiary types PGresAttDesc, PGresAttValue * represent the result of a query (or more precisely, of a single SQL * command --- a query string given to PQexec can contain multiple commands). * Note we assume that a single command can return at most one tuple group, * hence there is no need for multiple descriptor sets. */ /* Subsidiary-storage management structure for PGresult. * See space management routines in fe-exec.c for details. * Note that space[k] refers to the k'th byte starting from the physical * head of the block --- it's a union, not a struct! */ typedef union pgresult_data PGresult_data; union pgresult_data { PGresult_data *next; /* link to next block, or NULL */ char space[1]; /* dummy for accessing block as bytes */ }; /* Data about a single parameter of a prepared statement */ typedef struct pgresParamDesc { Oid typid; /* type id */ } PGresParamDesc; /* * Data for a single attribute of a single tuple * * We use char* for Attribute values. * * The value pointer always points to a null-terminated area; we add a * null (zero) byte after whatever the backend sends us. This is only * particularly useful for text values ... with a binary value, the * value might have embedded nulls, so the application can't use C string * operators on it. But we add a null anyway for consistency. * Note that the value itself does not contain a length word. * * A NULL attribute is a special case in two ways: its len field is NULL_LEN * and its value field points to null_field in the owning PGresult. All the * NULL attributes in a query result point to the same place (there's no need * to store a null string separately for each one). */ #define NULL_LEN (-1) /* pg_result len for NULL value */ typedef struct pgresAttValue { int len; /* length in bytes of the value */ char *value; /* actual value, plus terminating zero byte */ } PGresAttValue; /* Typedef for message-field list entries */ typedef struct pgMessageField { struct pgMessageField *next; /* list link */ char code; /* field code */ char contents[FLEXIBLE_ARRAY_MEMBER]; /* value, nul-terminated */ } PGMessageField; /* Fields needed for notice handling */ typedef struct { PQnoticeReceiver noticeRec; /* notice message receiver */ void *noticeRecArg; PQnoticeProcessor noticeProc; /* notice message processor */ void *noticeProcArg; } PGNoticeHooks; typedef struct PGEvent { PGEventProc proc; /* the function to call on events */ char *name; /* used only for error messages */ void *passThrough; /* pointer supplied at registration time */ void *data; /* optional state (instance) data */ bool resultInitialized; /* T if RESULTCREATE/COPY succeeded */ } PGEvent; struct pg_result { int ntups; int numAttributes; PGresAttDesc *attDescs; PGresAttValue **tuples; /* each PGresTuple is an array of * PGresAttValue's */ int tupArrSize; /* allocated size of tuples array */ int numParameters; PGresParamDesc *paramDescs; ExecStatusType resultStatus; char cmdStatus[CMDSTATUS_LEN]; /* cmd status from the query */ int binary; /* binary tuple values if binary == 1, * otherwise text */ /* * These fields are copied from the originating PGconn, so that operations * on the PGresult don't have to reference the PGconn. */ PGNoticeHooks noticeHooks; PGEvent *events; int nEvents; int client_encoding; /* encoding id */ /* * Error information (all NULL if not an error result). errMsg is the * "overall" error message returned by PQresultErrorMessage. If we have * per-field info then it is stored in a linked list. */ char *errMsg; /* error message, or NULL if no error */ PGMessageField *errFields; /* message broken into fields */ char *errQuery; /* text of triggering query, if available */ /* All NULL attributes in the query result point to this null string */ char null_field[1]; /* * Space management information. Note that attDescs and error stuff, if * not null, point into allocated blocks. But tuples points to a * separately malloc'd block, so that we can realloc it. */ PGresult_data *curBlock; /* most recently allocated block */ int curOffset; /* start offset of free space in block */ int spaceLeft; /* number of free bytes remaining in block */ }; /* PGAsyncStatusType defines the state of the query-execution state machine */ typedef enum { PGASYNC_IDLE, /* nothing's happening, dude */ PGASYNC_BUSY, /* query in progress */ PGASYNC_READY, /* result ready for PQgetResult */ PGASYNC_COPY_IN, /* Copy In data transfer in progress */ PGASYNC_COPY_OUT, /* Copy Out data transfer in progress */ PGASYNC_COPY_BOTH /* Copy In/Out data transfer in progress */ } PGAsyncStatusType; /* PGQueryClass tracks which query protocol we are now executing */ typedef enum { PGQUERY_SIMPLE, /* simple Query protocol (PQexec) */ PGQUERY_EXTENDED, /* full Extended protocol (PQexecParams) */ PGQUERY_PREPARE, /* Parse only (PQprepare) */ PGQUERY_DESCRIBE /* Describe Statement or Portal */ } PGQueryClass; /* PGSetenvStatusType defines the state of the PQSetenv state machine */ /* (this is used only for 2.0-protocol connections) */ typedef enum { SETENV_STATE_CLIENT_ENCODING_SEND, /* About to send an Environment Option */ SETENV_STATE_CLIENT_ENCODING_WAIT, /* Waiting for above send to complete */ SETENV_STATE_OPTION_SEND, /* About to send an Environment Option */ SETENV_STATE_OPTION_WAIT, /* Waiting for above send to complete */ SETENV_STATE_QUERY1_SEND, /* About to send a status query */ SETENV_STATE_QUERY1_WAIT, /* Waiting for query to complete */ SETENV_STATE_QUERY2_SEND, /* About to send a status query */ SETENV_STATE_QUERY2_WAIT, /* Waiting for query to complete */ SETENV_STATE_IDLE } PGSetenvStatusType; /* Typedef for the EnvironmentOptions[] array */ typedef struct PQEnvironmentOption { const char *envName, /* name of an environment variable */ *pgName; /* name of corresponding SET variable */ } PQEnvironmentOption; /* Typedef for parameter-status list entries */ typedef struct pgParameterStatus { struct pgParameterStatus *next; /* list link */ char *name; /* parameter name */ char *value; /* parameter value */ /* Note: name and value are stored in same malloc block as struct is */ } pgParameterStatus; /* large-object-access data ... allocated only if large-object code is used. */ typedef struct pgLobjfuncs { Oid fn_lo_open; /* OID of backend function lo_open */ Oid fn_lo_close; /* OID of backend function lo_close */ Oid fn_lo_creat; /* OID of backend function lo_creat */ Oid fn_lo_create; /* OID of backend function lo_create */ Oid fn_lo_unlink; /* OID of backend function lo_unlink */ Oid fn_lo_lseek; /* OID of backend function lo_lseek */ Oid fn_lo_lseek64; /* OID of backend function lo_lseek64 */ Oid fn_lo_tell; /* OID of backend function lo_tell */ Oid fn_lo_tell64; /* OID of backend function lo_tell64 */ Oid fn_lo_truncate; /* OID of backend function lo_truncate */ Oid fn_lo_truncate64; /* OID of function lo_truncate64 */ Oid fn_lo_read; /* OID of backend function LOread */ Oid fn_lo_write; /* OID of backend function LOwrite */ } PGlobjfuncs; /* PGdataValue represents a data field value being passed to a row processor. * It could be either text or binary data; text data is not zero-terminated. * A SQL NULL is represented by len < 0; then value is still valid but there * are no data bytes there. */ typedef struct pgDataValue { int len; /* data length in bytes, or <0 if NULL */ const char *value; /* data value, without zero-termination */ } PGdataValue; /* * PGconn stores all the state data associated with a single connection * to a backend. */ struct pg_conn { /* Saved values of connection options */ char *pghost; /* the machine on which the server is running */ char *pghostaddr; /* the numeric IP address of the machine on * which the server is running. Takes * precedence over above. */ char *pgport; /* the server's communication port number */ char *pgunixsocket; /* the directory of the server's Unix-domain * socket; if NULL, use DEFAULT_PGSOCKET_DIR */ char *pgtty; /* tty on which the backend messages is * displayed (OBSOLETE, NOT USED) */ char *connect_timeout; /* connection timeout (numeric string) */ char *client_encoding_initial; /* encoding to use */ char *pgoptions; /* options to start the backend with */ char *appname; /* application name */ char *fbappname; /* fallback application name */ char *dbName; /* database name */ char *replication; /* connect as the replication standby? */ char *pguser; /* Postgres username and password, if any */ char *pgpass; char *keepalives; /* use TCP keepalives? */ char *keepalives_idle; /* time between TCP keepalives */ char *keepalives_interval; /* time between TCP keepalive * retransmits */ char *keepalives_count; /* maximum number of TCP keepalive * retransmits */ char *sslmode; /* SSL mode (require,prefer,allow,disable) */ char *sslcompression; /* SSL compression (0 or 1) */ char *sslkey; /* client key filename */ char *sslcert; /* client certificate filename */ char *sslrootcert; /* root certificate filename */ char *sslcrl; /* certificate revocation list filename */ char *requirepeer; /* required peer credentials for local sockets */ #if defined(ENABLE_GSS) || defined(ENABLE_SSPI) char *krbsrvname; /* Kerberos service name */ #endif /* Optional file to write trace info to */ FILE *Pfdebug; /* Callback procedures for notice message processing */ PGNoticeHooks noticeHooks; /* Event procs registered via PQregisterEventProc */ PGEvent *events; /* expandable array of event data */ int nEvents; /* number of active events */ int eventArraySize; /* allocated array size */ /* Status indicators */ ConnStatusType status; PGAsyncStatusType asyncStatus; PGTransactionStatusType xactStatus; /* never changes to ACTIVE */ PGQueryClass queryclass; char *last_query; /* last SQL command, or NULL if unknown */ char last_sqlstate[6]; /* last reported SQLSTATE */ bool options_valid; /* true if OK to attempt connection */ bool nonblocking; /* whether this connection is using nonblock * sending semantics */ bool singleRowMode; /* return current query result row-by-row? */ char copy_is_binary; /* 1 = copy binary, 0 = copy text */ int copy_already_done; /* # bytes already returned in COPY * OUT */ PGnotify *notifyHead; /* oldest unreported Notify msg */ PGnotify *notifyTail; /* newest unreported Notify msg */ /* Connection data */ /* See PQconnectPoll() for how we use 'int' and not 'pgsocket'. */ pgsocket sock; /* FD for socket, PGINVALID_SOCKET if * unconnected */ SockAddr laddr; /* Local address */ SockAddr raddr; /* Remote address */ ProtocolVersion pversion; /* FE/BE protocol version in use */ int sversion; /* server version, e.g. 70401 for 7.4.1 */ bool auth_req_received; /* true if any type of auth req * received */ bool password_needed; /* true if server demanded a password */ bool dot_pgpass_used; /* true if used .pgpass */ bool sigpipe_so; /* have we masked SIGPIPE via SO_NOSIGPIPE? */ bool sigpipe_flag; /* can we mask SIGPIPE via MSG_NOSIGNAL? */ /* Transient state needed while establishing connection */ struct addrinfo *addrlist; /* list of possible backend addresses */ struct addrinfo *addr_cur; /* the one currently being tried */ int addrlist_family; /* needed to know how to free addrlist */ PGSetenvStatusType setenv_state; /* for 2.0 protocol only */ const PQEnvironmentOption *next_eo; bool send_appname; /* okay to send application_name? */ /* Miscellaneous stuff */ int be_pid; /* PID of backend --- needed for cancels */ int be_key; /* key of backend --- needed for cancels */ char md5Salt[4]; /* password salt received from backend */ pgParameterStatus *pstatus; /* ParameterStatus data */ int client_encoding; /* encoding id */ bool std_strings; /* standard_conforming_strings */ PGVerbosity verbosity; /* error/notice message verbosity */ PGContextVisibility show_context; /* whether to show CONTEXT field */ PGlobjfuncs *lobjfuncs; /* private state for large-object access fns */ /* Buffer for data received from backend and not yet processed */ char *inBuffer; /* currently allocated buffer */ int inBufSize; /* allocated size of buffer */ int inStart; /* offset to first unconsumed data in buffer */ int inCursor; /* next byte to tentatively consume */ int inEnd; /* offset to first position after avail data */ /* Buffer for data not yet sent to backend */ char *outBuffer; /* currently allocated buffer */ int outBufSize; /* allocated size of buffer */ int outCount; /* number of chars waiting in buffer */ /* State for constructing messages in outBuffer */ int outMsgStart; /* offset to msg start (length word); if -1, * msg has no length word */ int outMsgEnd; /* offset to msg end (so far) */ /* Row processor interface workspace */ PGdataValue *rowBuf; /* array for passing values to rowProcessor */ int rowBufLen; /* number of entries allocated in rowBuf */ /* Status for asynchronous result construction */ PGresult *result; /* result being constructed */ PGresult *next_result; /* next result (used in single-row mode) */ /* Assorted state for SSL, GSS, etc */ #ifdef USE_SSL bool allow_ssl_try; /* Allowed to try SSL negotiation */ bool wait_ssl_try; /* Delay SSL negotiation until after * attempting normal connection */ bool ssl_in_use; #ifdef USE_OPENSSL SSL *ssl; /* SSL status, if have SSL connection */ X509 *peer; /* X509 cert of server */ #ifdef USE_SSL_ENGINE ENGINE *engine; /* SSL engine, if any */ #else void *engine; /* dummy field to keep struct the same if * OpenSSL version changes */ #endif #endif /* USE_OPENSSL */ #endif /* USE_SSL */ #ifdef ENABLE_GSS gss_ctx_id_t gctx; /* GSS context */ gss_name_t gtarg_nam; /* GSS target name */ gss_buffer_desc ginbuf; /* GSS input token */ gss_buffer_desc goutbuf; /* GSS output token */ #endif #ifdef ENABLE_SSPI #ifndef ENABLE_GSS gss_buffer_desc ginbuf; /* GSS input token */ #else char *gsslib; /* What GSS librart to use ("gssapi" or * "sspi") */ #endif CredHandle *sspicred; /* SSPI credentials handle */ CtxtHandle *sspictx; /* SSPI context */ char *sspitarget; /* SSPI target name */ int usesspi; /* Indicate if SSPI is in use on the * connection */ #endif /* Buffer for current error message */ PQExpBufferData errorMessage; /* expansible string */ /* Buffer for receiving various parts of messages */ PQExpBufferData workBuffer; /* expansible string */ }; /* PGcancel stores all data necessary to cancel a connection. A copy of this * data is required to safely cancel a connection running on a different * thread. */ struct pg_cancel { SockAddr raddr; /* Remote address */ int be_pid; /* PID of backend --- needed for cancels */ int be_key; /* key of backend --- needed for cancels */ }; /* String descriptions of the ExecStatusTypes. * direct use of this array is deprecated; call PQresStatus() instead. */ extern char *const pgresStatus[]; #ifdef USE_SSL #ifndef WIN32 #define USER_CERT_FILE ".postgresql/postgresql.crt" #define USER_KEY_FILE ".postgresql/postgresql.key" #define ROOT_CERT_FILE ".postgresql/root.crt" #define ROOT_CRL_FILE ".postgresql/root.crl" #else /* On Windows, the "home" directory is already PostgreSQL-specific */ #define USER_CERT_FILE "postgresql.crt" #define USER_KEY_FILE "postgresql.key" #define ROOT_CERT_FILE "root.crt" #define ROOT_CRL_FILE "root.crl" #endif #endif /* USE_SSL */ /* ---------------- * Internal functions of libpq * Functions declared here need to be visible across files of libpq, * but are not intended to be called by applications. We use the * convention "pqXXX" for internal functions, vs. the "PQxxx" names * used for application-visible routines. * ---------------- */ /* === in fe-connect.c === */ extern void pqDropConnection(PGconn *conn, bool flushInput); extern int pqPacketSend(PGconn *conn, char pack_type, const void *buf, size_t buf_len); extern bool pqGetHomeDirectory(char *buf, int bufsize); #ifdef ENABLE_THREAD_SAFETY extern pgthreadlock_t pg_g_threadlock; #define PGTHREAD_ERROR(msg) \ do { \ fprintf(stderr, "%s\n", msg); \ abort(); \ } while (0) #define pglock_thread() pg_g_threadlock(true) #define pgunlock_thread() pg_g_threadlock(false) #else #define pglock_thread() ((void) 0) #define pgunlock_thread() ((void) 0) #endif /* === in fe-exec.c === */ extern void pqSetResultError(PGresult *res, const char *msg); extern void pqCatenateResultError(PGresult *res, const char *msg); extern void *pqResultAlloc(PGresult *res, size_t nBytes, bool isBinary); extern char *pqResultStrdup(PGresult *res, const char *str); extern void pqClearAsyncResult(PGconn *conn); extern void pqSaveErrorResult(PGconn *conn); extern PGresult *pqPrepareAsyncResult(PGconn *conn); extern void pqInternalNotice(const PGNoticeHooks *hooks, const char *fmt,...) pg_attribute_printf(2, 3); extern void pqSaveMessageField(PGresult *res, char code, const char *value); extern void pqSaveParameterStatus(PGconn *conn, const char *name, const char *value); extern int pqRowProcessor(PGconn *conn, const char **errmsgp); extern void pqHandleSendFailure(PGconn *conn); /* === in fe-protocol2.c === */ extern PostgresPollingStatusType pqSetenvPoll(PGconn *conn); extern char *pqBuildStartupPacket2(PGconn *conn, int *packetlen, const PQEnvironmentOption *options); extern void pqParseInput2(PGconn *conn); extern int pqGetCopyData2(PGconn *conn, char **buffer, int async); extern int pqGetline2(PGconn *conn, char *s, int maxlen); extern int pqGetlineAsync2(PGconn *conn, char *buffer, int bufsize); extern int pqEndcopy2(PGconn *conn); extern PGresult *pqFunctionCall2(PGconn *conn, Oid fnid, int *result_buf, int *actual_result_len, int result_is_int, const PQArgBlock *args, int nargs); /* === in fe-protocol3.c === */ extern char *pqBuildStartupPacket3(PGconn *conn, int *packetlen, const PQEnvironmentOption *options); extern void pqParseInput3(PGconn *conn); extern int pqGetErrorNotice3(PGconn *conn, bool isError); extern void pqBuildErrorMessage3(PQExpBuffer msg, const PGresult *res, PGVerbosity verbosity, PGContextVisibility show_context); extern int pqGetCopyData3(PGconn *conn, char **buffer, int async); extern int pqGetline3(PGconn *conn, char *s, int maxlen); extern int pqGetlineAsync3(PGconn *conn, char *buffer, int bufsize); extern int pqEndcopy3(PGconn *conn); extern PGresult *pqFunctionCall3(PGconn *conn, Oid fnid, int *result_buf, int *actual_result_len, int result_is_int, const PQArgBlock *args, int nargs); /* === in fe-misc.c === */ /* * "Get" and "Put" routines return 0 if successful, EOF if not. Note that for * Get, EOF merely means the buffer is exhausted, not that there is * necessarily any error. */ extern int pqCheckOutBufferSpace(size_t bytes_needed, PGconn *conn); extern int pqCheckInBufferSpace(size_t bytes_needed, PGconn *conn); extern int pqGetc(char *result, PGconn *conn); extern int pqPutc(char c, PGconn *conn); extern int pqGets(PQExpBuffer buf, PGconn *conn); extern int pqGets_append(PQExpBuffer buf, PGconn *conn); extern int pqPuts(const char *s, PGconn *conn); extern int pqGetnchar(char *s, size_t len, PGconn *conn); extern int pqSkipnchar(size_t len, PGconn *conn); extern int pqPutnchar(const char *s, size_t len, PGconn *conn); extern int pqGetInt(int *result, size_t bytes, PGconn *conn); extern int pqPutInt(int value, size_t bytes, PGconn *conn); extern int pqPutMsgStart(char msg_type, bool force_len, PGconn *conn); extern int pqPutMsgEnd(PGconn *conn); extern int pqReadData(PGconn *conn); extern int pqFlush(PGconn *conn); extern int pqWait(int forRead, int forWrite, PGconn *conn); extern int pqWaitTimed(int forRead, int forWrite, PGconn *conn, time_t finish_time); extern int pqReadReady(PGconn *conn); extern int pqWriteReady(PGconn *conn); /* === in fe-secure.c === */ extern int pqsecure_initialize(PGconn *); extern void pqsecure_destroy(void); extern PostgresPollingStatusType pqsecure_open_client(PGconn *); extern void pqsecure_close(PGconn *); extern ssize_t pqsecure_read(PGconn *, void *ptr, size_t len); extern ssize_t pqsecure_write(PGconn *, const void *ptr, size_t len); extern ssize_t pqsecure_raw_read(PGconn *, void *ptr, size_t len); extern ssize_t pqsecure_raw_write(PGconn *, const void *ptr, size_t len); #if defined(ENABLE_THREAD_SAFETY) && !defined(WIN32) extern int pq_block_sigpipe(sigset_t *osigset, bool *sigpipe_pending); extern void pq_reset_sigpipe(sigset_t *osigset, bool sigpipe_pending, bool got_epipe); #endif /* * The SSL implementation provides these functions (fe-secure-openssl.c) */ extern void pgtls_init_library(bool do_ssl, int do_crypto); extern int pgtls_init(PGconn *conn); extern PostgresPollingStatusType pgtls_open_client(PGconn *conn); extern void pgtls_close(PGconn *conn); extern ssize_t pgtls_read(PGconn *conn, void *ptr, size_t len); extern bool pgtls_read_pending(PGconn *conn); extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len); /* * this is so that we can check if a connection is non-blocking internally * without the overhead of a function call */ #define pqIsnonblocking(conn) ((conn)->nonblocking) #ifdef ENABLE_NLS extern char *libpq_gettext(const char *msgid) pg_attribute_format_arg(1); extern char *libpq_ngettext(const char *msgid, const char *msgid_plural, unsigned long n) pg_attribute_format_arg(1) pg_attribute_format_arg(2); #else #define libpq_gettext(x) (x) #define libpq_ngettext(s, p, n) ((n) == 1 ? (s) : (p)) #endif /* * These macros are needed to let error-handling code be portable between * Unix and Windows. (ugh) */ #ifdef WIN32 #define SOCK_ERRNO (WSAGetLastError()) #define SOCK_STRERROR winsock_strerror #define SOCK_ERRNO_SET(e) WSASetLastError(e) #else #define SOCK_ERRNO errno #define SOCK_STRERROR pqStrerror #define SOCK_ERRNO_SET(e) (errno = (e)) #endif #endif /* LIBPQ_INT_H */
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