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Commitde9a4c2

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Add PQlibVersion() function to libpq
This function is like the PQserverVersion() function exceptit returns the version of libpq, making it possible for a clientprogram or driver to determine which version of libpq is inuse at runtime, and not just at link time.Suggested by Harald Armin Massa and several others.
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‎doc/src/sgml/libpq.sgml

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@@ -5359,6 +5359,50 @@ void *PQresultAlloc(PGresult *res, size_t nBytes);
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</listitem>
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</varlistentry>
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<varlistentry id="libpq-pqlibversion">
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<term>
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<function>PQlibVersion</function>
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<indexterm>
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<primary>PQlibVersion</primary>
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<seealso>PQserverVersion</seealso>
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</indexterm>
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</term>
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<listitem>
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<para>
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Return the version of <productname>libpq</> that is being used.
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<synopsis>
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int PQlibVersion(void);
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</synopsis>
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</para>
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<para>
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The result of this function can be used to determine, at
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runtime, if specific functionality is available in the currently
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loaded version of libpq. The function can be used, for example,
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to determine which connection options are available for
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<function>PQconnectdb</> or if the <literal>hex</> <type>bytea</>
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output added in PostgreSQL 9.0 is supported.
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</para>
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<para>
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The number is formed by converting the major, minor, and revision
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numbers into two-decimal-digit numbers and appending them together.
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For example, version 9.1 will be returned as 90100, and version
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9.1.2 will be returned as 90102 (leading zeroes are not shown).
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</para>
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<note>
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<para>
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This function appeared in <productname>PostgreSQL</> version 9.1, so
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it cannot be used to detect required functionality in earlier
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versions, since linking to it will create a link dependency
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on version 9.1.
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</para>
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</note>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect1>

‎src/interfaces/libpq/exports.txt

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@@ -159,3 +159,4 @@ PQconnectdbParams 156
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PQconnectStartParams 157
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PQping 158
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PQpingParams 159
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PQlibVersion 160

‎src/interfaces/libpq/fe-misc.c

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@@ -66,6 +66,14 @@ static int pqSocketCheck(PGconn *conn, int forRead, int forWrite,
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time_tend_time);
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staticintpqSocketPoll(intsock,intforRead,intforWrite,time_tend_time);
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/*
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* PQlibVersion: return the libpq version number
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*/
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int
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PQlibVersion(void)
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{
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returnPG_VERSION_NUM;
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}
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/*
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* fputnbytes: print exactly N bytes to a file

‎src/interfaces/libpq/libpq-fe.h

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@@ -547,6 +547,9 @@ extern intlo_export(PGconn *conn, Oid lobjId, const char *filename);
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/* === in fe-misc.c === */
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/* Get the version of the libpq library in use */
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externintPQlibVersion(void);
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/* Determine length of multibyte encoded char at *s */
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externintPQmblen(constchar*s,intencoding);
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