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man/man3/rfork.html
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man/man3/rfork.html
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<head>
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<title>rfork(3) - Plan 9 from User Space</title>
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<meta content="text/html; charset=utf-8" http-equiv=Content-Type>
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</head>
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<body bgcolor=#ffffff>
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<table border=0 cellpadding=0 cellspacing=0 width=100%>
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<tr height=10><td>
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<tr><td width=20><td>
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<tr><td width=20><td><b>RFORK(3)</b><td align=right><b>RFORK(3)</b>
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<tr><td width=20><td colspan=2>
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<br>
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<p><font size=+1><b>NAME </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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rfork – manipulate process state<br>
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</table>
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<p><font size=+1><b>SYNOPSIS </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<tt><font size=+1>#include <u.h><br>
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#include <libc.h>
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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</font></tt>
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<tt><font size=+1>int rfork(int flags)<br>
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</font></tt>
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</table>
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<p><font size=+1><b>DESCRIPTION </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<i>Rfork</i> is a partial implementation of the Plan 9 system call. It
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can be used to manipulate some process state and to create new
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processes a la <a href="../man2/fork.html"><i>fork</i>(2)</a>. It cannot be used to create shared-memory
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processes (Plan 9’s <tt><font size=+1>RFMEM</font></tt> flag); for that functionality use <i>proccreate</i>
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(see <a href="../man3/thread.html"><i>thread</i>(3)</a>).
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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The <i>flags</i> argument to <i>rfork</i> selects which resources of the invoking
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process (parent) are shared by the new process (child) or initialized
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to their default values. <i>Flags</i> is the logical OR of some subset
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of<br>
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<tt><font size=+1>RFPROC</font></tt> If set a new process is created; otherwise changes affect
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the current process.<br>
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<tt><font size=+1>RFNOWAIT</font></tt> If set, the child process will be dissociated from the
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parent. Upon exit the child will leave no <tt><font size=+1>Waitmsg</font></tt> (see <a href="../man3/wait.html"><i>wait</i>(3)</a>)
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for the parent to collect.<br>
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<tt><font size=+1>RFNOTEG</font></tt> Each process is a member of a group of processes that all
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receive notes when a note is sent to the group (see <a href="../man3/postnote.html"><i>postnote</i>(3)</a>
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and <a href="../man2/signal.html"><i>signal</i>(2)</a>). The group of a new process is by default the same
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as its parent, but if <tt><font size=+1>RFNOTEG</font></tt> is set (regardless of <tt><font size=+1>RFPROC</font></tt>), the
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process becomes the first in a new group, isolated
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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from previous processes. In Plan 9, a process can call <tt><font size=+1>rfork(RFNOTEG)</font></tt>
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and then be sure that it will no longer receive console interrupts
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or other notes. Unix job-control shells put each command in its
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own process group and then relay notes to the current foreground
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command, making the idiom
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less useful.<br>
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</table>
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</table>
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<tt><font size=+1>RFFDG</font></tt> If set, the invoker’s file descriptor table (see <i>intro</i>(<i>))</i>
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is copied; otherwise the two processes share a single table.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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File descriptors in a shared file descriptor table are kept open
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until either they are explicitly closed or all processes sharing
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the table exit.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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If <tt><font size=+1>RFPROC</font></tt> is set, the value returned in the parent process is
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the process id of the child process; the value returned in the
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child is zero. Without <tt><font size=+1>RFPROC</font></tt>, the return value is zero. Process
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ids range from 1 to the maximum integer (<tt><font size=+1>int</font></tt>) value. <i>Rfork</i> will
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sleep, if necessary, until required process resources are available.
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<table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table>
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Calling <tt><font size=+1>rfork(RFFDG|RFPROC)</font></tt> is equivalent to calling <a href="../man2/fork.html"><i>fork</i>(2)</a>.<br>
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</table>
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<p><font size=+1><b>SOURCE </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<tt><font size=+1>/usr/local/plan9/src/lib9/rfork.c<br>
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</font></tt>
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</table>
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<p><font size=+1><b>DIAGNOSTICS </b></font><br>
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<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td>
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<i>Rfork</i> sets <i>errstr</i>.<br>
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</table>
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<td width=20>
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<tr height=20><td>
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</table>
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<!-- TRAILER -->
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<table border=0 cellpadding=0 cellspacing=0 width=100%>
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<tr height=15><td width=10><td><td width=10>
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<tr><td><td>
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<center>
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<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a>
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</center>
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</table>
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<!-- TRAILER -->
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</body></html>
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