@ -1,7 +1,7 @@
/*-------------------------------------------------------------------------
*
* strerror . c
* Replacement for standard strerror ( ) function
* Replacements for standard strerror ( ) and strerror_r ( ) functions
*
* Portions Copyright ( c ) 1996 - 2018 , PostgreSQL Global Development Group
* Portions Copyright ( c ) 1994 , Regents of the University of California
@ -15,13 +15,16 @@
# include "c.h"
/*
* Within this file , " strerror " means the platform ' s function not pg_strerror
* Within this file , " strerror " means the platform ' s function not pg_strerror ,
* and likewise for " strerror_r "
*/
# undef strerror
# undef strerror_r
static char * gnuish_strerror_r ( int errnum , char * buf , size_t buflen ) ;
static char * get_errno_symbol ( int errnum ) ;
# ifdef WIN32
static char * win32_socket_strerror ( int errnum ) ;
static char * win32_socket_strerror ( int errnum , char * buf , size_t buflen ) ;
# endif
@ -31,19 +34,28 @@ static char *win32_socket_strerror(int errnum);
char *
pg_strerror ( int errnum )
{
/* this buffer is only used if strerror() and get_errno_symbol() fail */
static char errorstr_buf [ 48 ] ;
static char errorstr_buf [ PG_STRERROR_R_BUFLEN ] ;
return pg_strerror_r ( errnum , errorstr_buf , sizeof ( errorstr_buf ) ) ;
}
/*
* A slightly cleaned - up version of strerror_r ( )
*/
char *
pg_strerror_r ( int errnum , char * buf , size_t buflen )
{
char * str ;
/* If it's a Windows Winsock error, that needs special handling */
# ifdef WIN32
/* Winsock error code range, per WinError.h */
if ( errnum > = 10000 & & errnum < = 11999 )
return win32_socket_strerror ( errnum ) ;
return win32_socket_strerror ( errnum , buf , buflen ) ;
# endif
/* Try the platform's strerror() */
str = strerror ( errnum ) ;
/* Try the platform's strerror_r(), or maybe just strerror () */
str = gnuish_ strerror_ r( errnum , buf , buflen ) ;
/*
* Some strerror ( ) s return an empty string for out - of - range errno . This
@ -57,17 +69,42 @@ pg_strerror(int errnum)
if ( str = = NULL )
{
snprintf ( errorstr_buf , sizeof ( errorstr_buf ) ,
/*------
translator : This string will be truncated at 47
characters expanded . */
_ ( " operating system error %d " ) , errnum ) ;
str = errorstr_buf ;
snprintf ( buf , buflen , _ ( " operating system error %d " ) , errnum ) ;
str = buf ;
}
return str ;
}
/*
* Simple wrapper to emulate GNU strerror_r if what the platform provides is
* POSIX . Also , if platform lacks strerror_r altogether , fall back to plain
* strerror ; it might not be very thread - safe , but tough luck .
*/
static char *
gnuish_strerror_r ( int errnum , char * buf , size_t buflen )
{
# ifdef HAVE_STRERROR_R
# ifdef STRERROR_R_INT
/* POSIX API */
if ( strerror_r ( errnum , buf , buflen ) = = 0 )
return buf ;
return NULL ; /* let caller deal with failure */
# else
/* GNU API */
return strerror_r ( errnum , buf , buflen ) ;
# endif
# else /* !HAVE_STRERROR_R */
char * sbuf = strerror ( errnum ) ;
if ( sbuf = = NULL ) /* can this still happen anywhere? */
return NULL ;
/* To minimize thread-unsafety hazard, copy into caller's buffer */
strlcpy ( buf , sbuf , buflen ) ;
return buf ;
# endif
}
/*
* Returns a symbol ( e . g . " ENOENT " ) for an errno code .
* Returns NULL if the code is unrecognized .
@ -247,9 +284,8 @@ get_errno_symbol(int errnum)
* Windows ' strerror ( ) doesn ' t know the Winsock codes , so handle them this way
*/
static char *
win32_socket_strerror ( int errnum )
win32_socket_strerror ( int errnum , char * buf , size_t buflen )
{
static char wserrbuf [ 256 ] ;
static HANDLE handleDLL = INVALID_HANDLE_VALUE ;
if ( handleDLL = = INVALID_HANDLE_VALUE )
@ -258,28 +294,29 @@ win32_socket_strerror(int errnum)
DONT_RESOLVE_DLL_REFERENCES | LOAD_LIBRARY_AS_DATAFILE ) ;
if ( handleDLL = = NULL )
{
sprintf ( wserrbuf , " winsock error %d (could not load netmsg.dll to translate: error code %lu) " ,
snprintf ( buf , buflen ,
" winsock error %d (could not load netmsg.dll to translate: error code %lu) " ,
errnum , GetLastError ( ) ) ;
return wserr buf;
return buf ;
}
}
ZeroMemory ( & wserrbuf , sizeof ( wserrbuf ) ) ;
ZeroMemory ( buf , buflen ) ;
if ( FormatMessage ( FORMAT_MESSAGE_IGNORE_INSERTS |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_FROM_HMODULE ,
handleDLL ,
errnum ,
MAKELANGID ( LANG_ENGLISH , SUBLANG_DEFAULT ) ,
wserr buf,
sizeof ( wserrbuf ) - 1 ,
buf ,
buflen - 1 ,
NULL ) = = 0 )
{
/* Failed to get id */
sprintf ( wserrbuf , " unrecognized winsock error %d " , errnum ) ;
sn printf ( buf , buflen , " unrecognized winsock error %d " , errnum ) ;
}
return wserr buf;
return buf ;
}
# endif /* WIN32 */
Tom Lane
7 years ago