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Diffstat (limited to 'sys-utils/unshare.1')
| -rw-r--r-- | sys-utils/unshare.1 | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/sys-utils/unshare.1 b/sys-utils/unshare.1 index 79ab96a1b..420b48b73 100644 --- a/sys-utils/unshare.1 +++ b/sys-utils/unshare.1 @@ -138,6 +138,12 @@ by bind mount. Fork the specified \fIprogram\fR as a child process of \fBunshare\fR rather than running it directly. This is useful when creating a new PID namespace. .TP +.BR \-\-kill\-child +When \fBunshare\fR terminates, have \fBSIGKILL\fR be sent to the forked child process. +Combined with \fB--pid\fR this allows for an easy and realiable killing of the entire +process tree below \fBunshare\fR. +This option implies \fB--fork\fR. +.TP .BR \-\-mount\-proc [ =\fImountpoint ] Just before running the program, mount the proc filesystem at \fImountpoint\fP (default is /proc). This is useful when creating a new PID namespace. It also @@ -229,6 +235,17 @@ the bind reference. Establish a persistent mount namespace referenced by the bind mount /root/namespaces/mnt. This example shows a portable solution, because it makes sure that the bind mount is created on a shared filesystem. +.TP +.B # unshare -pf --kill-child -- bash -c "(sleep 999 &) && sleep 1000" & +.TQ +.B # pid=$! +.TQ +.B # kill $pid +.br +Reliable killing of subprocesses of the \fIprogram\fR. +When \fBunshare\fR gets killed, everything below it gets killed as well. +Without it, the children of \fIprogram\fR would have orphaned and +been re-parented to PID 1. .SH SEE ALSO .BR clone (2), |