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0460e4ecc0
Commit 5579388d removed code that supplied a fallback implementation of
getaddrinfo(), which was dead code on modern systems. One tiny piece of
the removed code was still doing something useful on Windows, though:
that OS's own gai_strerror()/gai_strerrorA() function returns a pointer
to a static buffer that it overwrites each time, so it's not
thread-safe. In rare circumstances, a multi-threaded client program
could get an incorrect or corrupted error message.
Restore the replacement gai_strerror() function, though now that it's
only for Windows we can put it into a win32-specific file and cut it
down to the errors that Windows documents. The error messages here are
taken from FreeBSD, because Windows' own messages seemed too verbose.
Back-patch to 16.
Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>
Discussion: https://postgr.es/m/CA%2BhUKGKz%2BF9d2PTiXwfYV7qJw%2BWg2jzACgSDgPizUw7UG%3Di58A%40mail.gmail.com
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/*-------------------------------------------------------------------------
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*
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* win32gai_strerror.c
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* Thread-safe gai_strerror() for Windows.
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*
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* Portions Copyright (c) 2024, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/port/win32gai_strerror.c
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*
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*-------------------------------------------------------------------------
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*/
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#include <sys/socket.h>
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/*
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* Windows has gai_strerrorA(), but it is not thread-safe so we avoid it.
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*
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* https://learn.microsoft.com/en-us/windows/win32/api/ws2tcpip/nf-ws2tcpip-gai_strerrora
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*/
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const char *
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gai_strerror(int errcode)
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{
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switch (errcode)
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{
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case EAI_AGAIN:
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return "Temporary failure in name resolution";
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case EAI_BADFLAGS:
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return "Bad value for ai_flags";
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case EAI_FAIL:
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return "Non-recoverable failure in name resolution";
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case EAI_FAMILY:
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return "ai_family not supported";
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case EAI_MEMORY:
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return "Memory allocation failure";
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case EAI_NONAME:
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return "Name or service not known";
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case EAI_SERVICE:
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return "Servname not supported for ai_socktype";
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case EAI_SOCKTYPE:
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return "ai_socktype not supported";
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default:
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return "Unknown server error";
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}
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}
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