d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

MFC 1.11.2.3 from -stable to -current

Browse Source
This commit is contained in:
dillon 2000-07-25 18:50:22 +00:00
parent e7f2e618d2
commit 48adcd61e9
1 changed files with 21 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
lib/libc/sys/rfork.2
View File

@ -54,13 +54,16 @@ If set, the new process starts with a clean file descriptor table.
Is mutually exclusive with
.Dv RFFDG .
.It RFMEM
If set, the kernel will force sharing of the entire address space.
If set, the kernel will force sharing of the entire address space,
typically by sharing the hardawre page table directly.
The child
will then inherit all the shared segments the parent process owns.
Other segment
types will be unaffected. Subsequent forks by the parent will then
propagate the shared data and bss between children. The stack segment
is always split. May be set only with
will thus inherit and share all the segments the parent process owns,
whether they are normally shareable or not. The stack segment is
not split (both the parent and child return on the same stack) and thus
.Fn rfork
with the RFMEM flag may not generally be called directly from a high level
language. For example, you may not call it directly from C.
May be set only with
.Dv RFPROC .
.It RFSIGSHARE
If set, the kernel will force sharing the sigacts structure between the
@ -143,6 +146,18 @@ There is insufficient swap space for the new process.
.Xr intro 2 ,
.Xr minherit 2 ,
.Xr vfork 2
.Sh BUGS
FreeBSD does not yet implement a native
.Fn clone
library call, and the current pthreads implementation does not use
.Fn
rfork
with RFMEM. A native port of the linux threads library,
.Pa /usr/ports/devel/linuxthreads ,
contains a working
.Fn
clone
call that utilizes RFMEM.
.Sh HISTORY
The
.Fn rfork