V8/usr/man/man2/deprecated.2

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.TH DEPRECATED 2
.SH NAME
setpgrp, vfork, vadvise, vlimit, vswapon \- system calls to be avoided
.SH SYNOPSIS
.B setpgrp(pid, pgrp)
.sp
.B int getpgrp(pid)
.sp
.B int vfork()
.sp
.B vadvise(how)
.sp
.B int vlimit(what, limit)
.sp
.B vswapon(special)
.br
.B char *special;
.SH DESCRIPTION
These calls are hangovers from the Berkeley version of the system.
Some exist only for system maintenance purposes;
some depend on the virtual memory implementation.
None should be used except as a last resort.
Most are not included in
.BR /lib/libc.a .
.PP
.I Setpgrp
sets the process group number
for process
.I pid
to
.IR pgrp ;
.I getpgrp
returns the process group.
.PP
.I Vfork
is a peculiar variant of fork
in which the child borrows the parent's address space
until
.I exec
or
.IR exit .
The intent is to avoid copying a large address space.
.PP
.I Vadvise
gives the virtual memory system
hints about the paging behaviour
of the current process.
.PP
.I Vlimit
sets various resource limits,
such as the amount of memory allowed for text and data,
and the maximum size of core images.
.PP
.I Vswapon
adds
the block device
.I special
to the pool of swap space.
The device must be listed in a table
compiled into the kernel;
.I vswapon
merely enables it.
.PP
See the Berkeley manual for more information about these calls.