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<title>mach(3) - Plan 9 from User Space</title>
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<tr><td width=20><td><b>MACH(3)</b><td align=right><b>MACH(3)</b>
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<br>
<p><font size=+1><b>NAME </b></font><br>
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machbytype, machbyname &ndash; machine-independent access to executables
and programs<br>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<tt><font size=+1>#include &lt;u.h&gt;<br>
#include &lt;libc.h&gt;<br>
#include &lt;mach.h&gt;
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</font></tt>
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<tt><font size=+1>void machbytype(int type)
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<tt><font size=+1>int machbyname(char *name)
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<tt><font size=+1>extern Mach *mach;<br>
</font></tt>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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<i>Libmach</i> provides an interface for accessing the executable files
and executing images of various architectures and operating systems.
The interface is machine-independent, meaning that, for example,
Mac OS X core dumps may be inspected using an x86 Linux machine
and vice versa. In its current form, the library is
mainly useful for writing debuggers of one sort or another.
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An architecture is described primarily by a <tt><font size=+1>Mach</font></tt> structure, which
contains data structures and parameters describing the particular
architecture. Most library functions assume that the global variable
<i>mach</i> points at the structure for the architecture being debugged.
It is set implicitly by <i>crackhdr</i> (see <a href="../man3/mach-file.html"><i>mach-file</i>(3)</a>) and
can be set explicitly by calling <i>machbyname</i> or <i>machbytype</i>.
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There is no operating system-specific structure akin to <i>mach</i>.
Typically the choice of operating system on a particular architecture
affects only the executable and core dump formats; the various
file parsers deduce the operating system from information in the
binary files themselves and adjust accordingly.
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The supported architectures are <tt><font size=+1>386</font></tt> (Intel 32-bit x86) 386 and
later) and <tt><font size=+1>power</font></tt> (IBM PowerPC, typically running Mac OS X).
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Other manual pages describe the library functions in detail.
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<a href="../man3/Mach-cmd.html"><i>Mach-cmd</i>(3)</a> describes some convenience routines for attaching
to processes and core files.
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<a href="../man3/Mach-file.html"><i>Mach-file</i>(3)</a> describes the manipulation of binary files.
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<a href="../man3/Mach-map.html"><i>Mach-map</i>(3)</a> describes the interface to address spaces and register
sets in executable files and executing programs.
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<a href="../man3/Mach-stack.html"><i>Mach-stack</i>(3)</a> describes support for unwinding the stack.
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<a href="../man3/Mach-swap.html"><i>Mach-swap</i>(3)</a> describes helper functions for accessing data in
a particular byte order.
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<a href="../man3/Mach-symbol.html"><i>Mach-symbol</i>(3)</a> describes the interface to debugging symbol information.<br>
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<p><font size=+1><b>SOURCE </b></font><br>
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<tt><font size=+1>/usr/local/plan9/src/libmach<br>
</font></tt>
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<p><font size=+1><b>SEE ALSO </b></font><br>
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<a href="../man3/mach-file.html"><i>mach-file</i>(3)</a>, <a href="../man3/mach-map.html"><i>mach-map</i>(3)</a>, <a href="../man3/mach-stack.html"><i>mach-stack</i>(3)</a>, <a href="../man3/mach-swap.html"><i>mach-swap</i>(3)</a>, <a href="../man3/mach-symbol.html"><i>mach-symbol</i>(3)</a><br>
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