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<title>Berkeley DB Reference Guide: HP-UX</title>
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<meta name="description" content="Berkeley DB: An embedded database programmatic toolkit.">
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<table width="100%"><tr valign=top>
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<td><h3><dl><dt>Berkeley DB Reference Guide:<dd>Building Berkeley DB for UNIX systems</dl></h3></td>
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<td align=right><a href="../../ref/build_unix/freebsd.html"><img src="../../images/prev.gif" alt="Prev"></a><a href="../../reftoc.html"><img src="../../images/ref.gif" alt="Ref"></a><a href="../../ref/build_unix/irix.html"><img src="../../images/next.gif" alt="Next"></a>
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<h1 align=center>HP-UX</h1>
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<p><li><b>I can't specify the <a href="../../api_c/env_open.html#DB_SYSTEM_MEM">DB_SYSTEM_MEM</a> flag to <a href="../../api_c/env_open.html">DB_ENV->open</a>.</b>
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<p>The <b>shmget</b>(2) interfaces are not always used on HP-UX, even
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though they exist, because anonymous memory allocated using <b>shmget</b>(2)
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cannot be used to store the standard HP-UX msemaphore semaphores. For
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this reason, it may not be possible to specify the <a href="../../api_c/env_open.html#DB_SYSTEM_MEM">DB_SYSTEM_MEM</a>
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flag on some versions of HP-UX. (We have seen this problem only on HP-UX
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10.XX, so the simplest workaround may be to upgrade your HP-UX release.)
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<p><li><b>I can't specify both the <a href="../../api_c/env_open.html#DB_PRIVATE">DB_PRIVATE</a> and <a href="../../api_c/env_open.html#DB_THREAD">DB_THREAD</a>
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flags to <a href="../../api_c/env_open.html">DB_ENV->open</a>.</b>
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<p>It is not possible to store the standard HP-UX msemaphore semaphores in
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memory returned by <b>malloc</b>(3) in some versions of HP-UX. For
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this reason, it may not be possible to specify both the
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<a href="../../api_c/env_open.html#DB_PRIVATE">DB_PRIVATE</a> and <a href="../../api_c/env_open.html#DB_THREAD">DB_THREAD</a> flags on some versions of
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HP-UX. (We have seen this problem only on HP-UX 10.XX, so the simplest
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workaround may be to upgrade your HP-UX release.)
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<p><li><b>During configuration, I see a message that large file support
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has been turned off.</b>
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<p>Some HP-UX system include files redefine "open" when big-file support (the
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HAVE_FILE_OFFSET_BITS and _FILE_OFFSET_BITS #defines) is enabled. This
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causes problems when compiling for C++, where "open" is a legal
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identifier, used in the Berkeley DB C++ API. For this reason, we automatically
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turn off big-file support when Berkeley DB is configured with a C++ API. This
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should not be a problem for applications unless there is a need to create
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databases larger than 2GB.
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<p><li><b>I can't compile and run multithreaded applications.</b>
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<p>Special compile-time flags are required when compiling threaded
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applications on HP-UX. If you are compiling a threaded application, you
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must compile with the _REENTRANT flag:
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<p><blockquote><pre>cc -D_REENTRANT ...</pre></blockquote>
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<p>The Berkeley DB library will automatically build with the correct options.
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<p><li><b>An ENOMEM error is returned from <a href="../../api_c/env_open.html">DB_ENV->open</a> or
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<a href="../../api_c/env_remove.html">DB_ENV->remove</a>.</b>
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<p>Due to the constraints of the PA-RISC memory architecture, HP-UX does not
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allow a process to map a file into its address space multiple times.
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For this reason, each Berkeley DB environment may be opened only once by a
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process on HP-UX; that is, calls to <a href="../../api_c/env_open.html">DB_ENV->open</a> will fail if the
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specified Berkeley DB environment has been opened and not subsequently closed.
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<p><li><b>When compiling with gcc, I see the following error:
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<p><blockquote><pre>#error "Large Files (ILP32) not supported in strict ANSI mode."</pre></blockquote></b>
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<p>We believe this is an error in the HP-UX include files, but we don't
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really understand it. The only workaround we have found is to add
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-D__STDC_EXT__ to the C preprocessor defines as part of compilation.
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<p><li><b>When using the Tcl or Perl APIs (including running the test
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suite), I see the error "Can't shl_load() a library containing Thread
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<p>This problem happens when HP-UX has been configured to use pthread mutex
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locking, and an attempt is made to call Berkeley DB using the Tcl or Perl APIs.
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We have never found any way to fix this problem as part of the Berkeley DB
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build process. To work around the problem, rebuild tclsh or Perl, and
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modify its build process to explicitly link it against the HP-UX pthread
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library (currently /usr/lib/libpthread.a).
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<p><li><b>When running an executable that has been dynamically linked
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against the Berkeley DB library, I see the error "Can't find path for shared
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library" even though I correctly set the SHLIB_PATH environment variable.</b>
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<p>By default, some versions of HP-UX ignore the dynamic library search
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path specified by the SHLIB_PATH environment variable. To work around
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this, specify the "+s" flag to ld when linking, or run the following
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command on the executable that is not working:
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<p><blockquote><pre>chatr +s enable -l /full/path/to/libdb-3.2.sl ...</pre></blockquote>
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