diff options
Diffstat (limited to 'man/man3/rfork.html')
| -rw-r--r-- | man/man3/rfork.html | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/man/man3/rfork.html b/man/man3/rfork.html new file mode 100644 index 00000000..f76a61fd --- /dev/null +++ b/man/man3/rfork.html @@ -0,0 +1,118 @@ +<head> +<title>rfork(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>RFORK(3)</b><td align=right><b>RFORK(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> + + rfork – manipulate process state<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 <u.h><br> + #include <libc.h> + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>int rfork(int flags)<br> + </font></tt> +</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> + + <i>Rfork</i> is a partial implementation of the Plan 9 system call. It + can be used to manipulate some process state and to create new + processes a la <a href="../man2/fork.html"><i>fork</i>(2)</a>. It cannot be used to create shared-memory + processes (Plan 9’s <tt><font size=+1>RFMEM</font></tt> flag); for that functionality use <i>proccreate</i> + (see <a href="../man3/thread.html"><i>thread</i>(3)</a>). + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + The <i>flags</i> argument to <i>rfork</i> selects which resources of the invoking + process (parent) are shared by the new process (child) or initialized + to their default values. <i>Flags</i> is the logical OR of some subset + of<br> + <tt><font size=+1>RFPROC</font></tt> If set a new process is created; otherwise changes affect + the current process.<br> + <tt><font size=+1>RFNOWAIT</font></tt> If set, the child process will be dissociated from the + 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>) + for the parent to collect.<br> + <tt><font size=+1>RFNOTEG</font></tt> Each process is a member of a group of processes that all + receive notes when a note is sent to the group (see <a href="../man3/postnote.html"><i>postnote</i>(3)</a> + and <a href="../man2/signal.html"><i>signal</i>(2)</a>). The group of a new process is by default the same + as its parent, but if <tt><font size=+1>RFNOTEG</font></tt> is set (regardless of <tt><font size=+1>RFPROC</font></tt>), the + process becomes the first in a new group, isolated + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + from previous processes. In Plan 9, a process can call <tt><font size=+1>rfork(RFNOTEG)</font></tt> + and then be sure that it will no longer receive console interrupts + or other notes. Unix job-control shells put each command in its + own process group and then relay notes to the current foreground + command, making the idiom + less useful.<br> + + </table> + + </table> + <tt><font size=+1>RFFDG</font></tt> If set, the invoker’s file descriptor table (see <i>intro</i>(<i>))</i> + is copied; otherwise the two processes share a single table. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + File descriptors in a shared file descriptor table are kept open + until either they are explicitly closed or all processes sharing + the table exit. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + If <tt><font size=+1>RFPROC</font></tt> is set, the value returned in the parent process is + the process id of the child process; the value returned in the + child is zero. Without <tt><font size=+1>RFPROC</font></tt>, the return value is zero. Process + ids range from 1 to the maximum integer (<tt><font size=+1>int</font></tt>) value. <i>Rfork</i> will + sleep, if necessary, until required process resources are available. + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + 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> + +</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/lib9/rfork.c<br> + </font></tt> +</table> +<p><font size=+1><b>DIAGNOSTICS </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <i>Rfork</i> sets <i>errstr</i>.<br> + +</table> + +<td width=20> +<tr height=20><td> +</table> +<!-- TRAILER --> +<table border=0 cellpadding=0 cellspacing=0 width=100%> +<tr height=15><td width=10><td><td width=10> +<tr><td><td> +<center> +<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a> +</center> +</table> +<!-- TRAILER --> +</body></html> |