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-<head>
-<title>mach-file(3) - Plan 9 from User Space</title>
-<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
-</head>
-<body bgcolor=#ffffff>
-<table border=0 cellpadding=0 cellspacing=0 width=100%>
-<tr height=10><td>
-<tr><td width=20><td>
-<tr><td width=20><td><b>MACH-FILE(3)</b><td align=right><b>MACH-FILE(3)</b>
-<tr><td width=20><td colspan=2>
- <br>
-<p><font size=+1><b>NAME </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- crackhdr, uncrackhdr, mapfile, unmapfile, mapproc, unmapproc,
- detachproc, ctlproc, procnotes &ndash; machine-independent access to
- exectuable files and running processes<br>
-
-</table>
-<p><font size=+1><b>SYNOPSIS </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <tt><font size=+1>#include &lt;u.h&gt;<br>
- #include &lt;libc.h&gt;<br>
- #include &lt;mach.h&gt;
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
- </font></tt>
- int &nbsp;&nbsp;&nbsp;&nbsp;crackhdr(int fd, Fhdr *hdr)<br>
- void &nbsp;&nbsp;&nbsp;uncrackhdr(Fhdr *hdr)
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- int &nbsp;&nbsp;&nbsp;&nbsp;mapfile(Fhdr *hdr, ulong base, Map *map, Regs **regs)<br>
- void &nbsp;&nbsp;&nbsp;unmapfile(Fhdr *hdr, Map *map)<br>
- int &nbsp;&nbsp;&nbsp;&nbsp;mapproc(int pid, Map *map, Regs **regs)<br>
- void &nbsp;&nbsp;&nbsp;unmapproc(Map *map)<br>
- int &nbsp;&nbsp;&nbsp;&nbsp;detachproc(int pid)<br>
- int &nbsp;&nbsp;&nbsp;&nbsp;ctlproc(int pid, char *msg)<br>
- int &nbsp;&nbsp;&nbsp;&nbsp;procnotes(int pid, char ***notes)<br>
-
-</table>
-<p><font size=+1><b>DESCRIPTION </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- These functions parse executable files and provide access to those
- files and to running processes.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- <i>Crackhdr</i> opens and parses the named executable file. The returned
- data structure <i>hdr</i> is initialized with a machine-independent description
- of the header information. The following fields are the most commonly
- used:<br>
- <tt><font size=+1>mach</font></tt>a pointer to the <tt><font size=+1>Mach</font></tt> structure for the target architecture<br>
- <tt><font size=+1>mname<br>
- </font></tt>
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- the name of the target architecture<br>
-
- </table>
- <tt><font size=+1>fname<br>
- </font></tt>
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- a description of the kind of file (e.g., executable, core dump)<br>
-
- </table>
- <tt><font size=+1>aname<br>
- </font></tt>
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- a description of the application binary interface this file uses;
- typically it is the name of an operating system If the global
- variable <i>mach</i> is nil, <i>crackhdr</i> points it to the same <tt><font size=+1>Mach</font></tt> structure.
-
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
-
- </table>
- <i>Mapfile</i> adds the segments found in <i>hdr</i> to <i>map</i>. If <i>hdr</i> is an executable
- file, there are typically three segments: <i>text</i>, <i>data</i>, and a zero-backed
- <i>bss</i>. If <i>hdr</i> is a dynamic shared library, its segments are relocated
- by <i>base</i> before being mapping.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- If <i>hdr</i> is a core file, there is one segment named <i>core</i> for each
- contiguous section of memory recorded in the core file. There
- are often quite a few of these, as most operating systems omit
- clean memory pages when writing core files (Mac OS X is the only
- exception among the supported systems). Because core files
- have such holes, it is typically necessary to construct the core
- map by calling <i>mapfile</i> on the executable and then calling it again
- on the core file. Newly-added segments are mapped on top of existing
- segments, so this arrangement will use the core file for the segments
- it contains but fall back to the executable for the
- rest.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- <i>Unmapfile</i> removes the mappings in <i>map</i> corresponding to <i>hdr</i>.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- <i>Mapproc</i> attaches to a running program and adds its segments to
- the given map. It adds one segment for each contiguous section
- of mapped memory. On systems where this information cannot be
- determined, it adds a single segment covering the entire address
- space. Accessing areas of this segment that are
- actually not mapped in the process address space will cause the
- get/put routines to return errors.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- <i>Unmapproc</i> removes the mappings in <i>map</i> corresponding to <i>pid</i>. <i>Detachproc</i>
- detaches from all previously attached processes.
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
- <i>Ctlproc</i> manipulates the process with id <i>pid</i> according to the message
- <i>msg</i>. Valid messages include:<br>
- <tt><font size=+1>kill</font></tt>terminate the process<br>
- <tt><font size=+1>startstop<br>
- </font></tt>
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- start the process and wait for it to stop<br>
-
- </table>
- <tt><font size=+1>sysstop<br>
- </font></tt>
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- arrange for the process to stop at its next system call, start
- the process, and then wait for it to stop<br>
-
- </table>
- <tt><font size=+1>waitstop<br>
- </font></tt>
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- wait for the process to stop<br>
-
- </table>
- <tt><font size=+1>start<br>
- </font></tt>
- <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- start the process
- <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
-
-
- </table>
- <i>Procnotes</i> fills <tt><font size=+1>*</font></tt><i>notes</i> with a pointer to an array of strings representing
- pending notes waiting for the process. (On Unix, these notes are
- textual descriptions of any pending signals.) <i>Procnotes</i> returns
- the number of pending notes. The memory at <tt><font size=+1>*</font></tt><i>notes</i> should be freed
- via <i>free</i> (see <a href="../man3/malloc.html"><i>malloc</i>(3)</a>) when no longer needed.
-
-</table>
-<p><font size=+1><b>SOURCE </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <tt><font size=+1>/usr/local/plan9/src/libmach<br>
- </font></tt>
-</table>
-<p><font size=+1><b>SEE ALSO </b></font><br>
-
-<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
-
- <a href="../man3/mach.html"><i>mach</i>(3)</a>, <a href="../man3/mach-map.html"><i>mach-map</i>(3)</a><br>
-
-</table>
-
-<td width=20>
-<tr height=20><td>
-</table>
-<!-- TRAILER -->
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-<tr><td><td>
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