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.\" Copyright (c) 1998 John D. Polstra
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.\" All rights reserved.
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" $FreeBSD: /repoman/r/ncvs/src/lib/libc/gen/dladdr.3,v 1.3.2.4 2003/03/15 15:11:05 trhodes Exp $
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.Nd find the shared object containing a given address
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.Fn dladdr "const void *addr" "Dl_info *info"
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queries the dynamic linker for information about the shared object
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containing the address
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The information is returned in the structure specified by
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The structure contains at least the following members:
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.Bl -tag -width "XXXconst char *dli_fname"
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.It Li "const char *dli_fname"
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The pathname of the shared object containing the address.
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.It Li "void *dli_fbase"
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The base address at which the shared object is mapped into the
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address space of the calling process.
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.It Li "const char *dli_sname"
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The name of the nearest run-time symbol with a value less than or
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If no symbol with a suitable value is found, both this field and
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.It Li "void *dli_saddr"
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The value of the symbol returned in
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is available only in dynamically linked programs.
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If a mapped shared object containing
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On success, a non-zero value is returned.
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function first appeared in the Solaris operating system.
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The dlcompat package was written by Jorge Acereda
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<jacereda@users.sourceforge.net> and
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Peter O'Gorman <ogorman@users.sourceforge.net>
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Some of the code for this particular function was borrowed from
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a post to the darwin development list by Douglas Davidson.
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This man page was borrowed from FreeBSD and modified.
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This implementation is almost bug-compatible with the Solaris
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implementation. The following bugs are present:
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lies in the main executable rather than in a shared library, the
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may not be correct. The pathname is taken directly from
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of the calling process. When executing a program specified by its
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full pathname, most shells set
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to the pathname. But this is not required of shells or guaranteed
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by the operating system.
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can not be used to get the error string if
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The symbol returned has an underscore if it is a C symbol, and can
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not be used as input to
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in a default dlcompat installation takes symbol names as they appear
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in C source code (no underscore).
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Returning 0 as an indication of failure goes against long-standing