mirror of https://github.com/mkerrisk/man-pages
Various rewordings and updates to 2.6.16 reality.
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@ -62,7 +62,9 @@ or
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.\" CLONE_NEWNS does the same thing in clone(), but CLONE_VM,
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.\" CLONE_FS, and CLONE_FILES reverse the action of the clone()
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.\" flags of the same name.
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This flag has the same effect as the
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This flag has the
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.I same
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effect as the
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.BR clone (2)
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.B CLONE_NEWNS
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flag.
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@ -72,25 +74,37 @@ Specifying this flag automatically implies
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.B CLONE_FS
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as well.
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.\" As at 2.6.16, the following forced implications also apply,
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.\" although CLONE_THREAD and CLONE_SIGHAND are not yet implemented.
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.\" although the relevant flags are not yet implemented.
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.\" If CLONE_THREAD is set force CLONE_VM.
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.\" If CLONE_VM is set, force CLONE_SIGHAND.
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.\" If CLONE_SIGHAND is set and signals are also being shared
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.\" (i.e., current->signal->count > 1), force CLONE_THREAD.
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.TP
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.B CLONE_VM
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Reverse the effect of the
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.BR clone (2)
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.B CLONE_VM
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flag.
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.RB ( CLONE_VM
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is also implicitly set by
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.BR vfork (2),
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and can be reversed using this
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.BR unshare ()
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flag.)
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Unshare virtual memory, so that the calling process no
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longer shares its virtual address space with any other process.
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.\"
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.\" FIXME . CLONE_VM is not (yet, as at 2.6.16) implemented.
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.\" .TP
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.\" .B CLONE_VM
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.\" Reverse the effect of the
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.\" .BR clone (2)
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.\" .B CLONE_VM
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.\" flag.
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.\" .RB ( CLONE_VM
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.\" is also implicitly set by
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.\" .BR vfork (2),
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.\" and can be reversed using this
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.\" .BR unshare ()
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.\" flag.)
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.\" Unshare virtual memory, so that the calling process no
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.\" longer shares its virtual address space with any other process.
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.PP
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Specifying any other bits in
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.I flags
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is likely to cause compatibility problems if the corresponding
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.B CLONE_*
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values are implemented in future kernels.
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Avoid doing this.
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.\" FIXME . Check if a later kernel (e.g., 2.6.17) makes explicit
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.\" checks to prevent unimplemented bits being set in 'flags'.
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.\"
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.PP
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If
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.I flags
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@ -137,13 +151,20 @@ In particular, as at kernel 2.6.16,
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.BR unshare ()
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does not implement flags that reverse the effects of
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.BR CLONE_SIGHAND ,
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.\" However we can do unshare(CLONE_SIGHAND) if CLONE_SIGHAND
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.\" However, we can do unshare(CLONE_SIGHAND) if CLONE_SIGHAND
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.\" was not specified when doing clone(); i.e., unsharing
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.\" signal handlers is permitted if we are not actually
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.\" sharing signal handlers. mtk
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.BR CLONE_SYSVSEM ,
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.BR CLONE_THREAD ,
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or
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.BR CLONE_THREAD .
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.\" FIXME . check future kernel versions (e.g., 2.6.17)
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.\" to see if CLONE_VM gets implemented.
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.BR CLONE_VM .
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.\" However, as at 2.6.16, we can do unshare(CLONE_VM) if CLONE_VM
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.\" was not specified when doing clone(); i.e., unsharing
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.\" virtual memory is permitted if we are not actually
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.\" sharing virtual memory. mtk
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Such functionality may be added in the future, if required.
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.\"
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.\"9) Future Work
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