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freebsd-skq/usr.bin/protect/protect.1

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Reassign copyright statements on several files from Advanced Computing Technologies LLC to Hudson River Trading LLC. Approved by: Hudson River Trading LLC (who owns ACT LLC) MFC after: 1 week
2015-04-23 14:22:20 +00:00
.\" Copyright (c) 2013 Hudson River Trading LLC
Extend the support for exempting processes from being killed when swap is exhausted. - Add a new protect(1) command that can be used to set or revoke protection from arbitrary processes. Similar to ktrace it can apply a change to all existing descendants of a process as well as future descendants. - Add a new procctl(2) system call that provides a generic interface for control operations on processes (as opposed to the debugger-specific operations provided by ptrace(2)). procctl(2) uses a combination of idtype_t and an id to identify the set of processes on which to operate similar to wait6(). - Add a PROC_SPROTECT control operation to manage the protection status of a set of processes. MADV_PROTECT still works for backwards compatability. - Add a p_flag2 to struct proc (and a corresponding ki_flag2 to kinfo_proc) the first bit of which is used to track if P_PROTECT should be inherited by new child processes. Reviewed by: kib, jilles (earlier version) Approved by: re (delphij) MFC after: 1 month
2013-09-19 18:53:42 +00:00
.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd September 19, 2013
.Dt PROTECT 1
.Os
.Sh NAME
.Nm protect
.Nd "protect processes from being killed when swap space is exhausted"
.Sh SYNOPSIS
.Nm
.Op Fl i
.Ar command
.Nm
.Op Fl cdi
.Fl g Ar pgrp | Fl p Ar pid
.Sh DESCRIPTION
The
.Nm
command is used to mark processes as protected.
The kernel does not kill protected processes when swap space is exhausted.
Note that this protected state is not inherited by child processes by default.
.Pp
The options are:
Minor mdoc improvements. Approved by: re (blanket)
2013-09-19 19:43:38 +00:00
.Bl -tag -width XXXXXXXXXX
Extend the support for exempting processes from being killed when swap is exhausted. - Add a new protect(1) command that can be used to set or revoke protection from arbitrary processes. Similar to ktrace it can apply a change to all existing descendants of a process as well as future descendants. - Add a new procctl(2) system call that provides a generic interface for control operations on processes (as opposed to the debugger-specific operations provided by ptrace(2)). procctl(2) uses a combination of idtype_t and an id to identify the set of processes on which to operate similar to wait6(). - Add a PROC_SPROTECT control operation to manage the protection status of a set of processes. MADV_PROTECT still works for backwards compatability. - Add a p_flag2 to struct proc (and a corresponding ki_flag2 to kinfo_proc) the first bit of which is used to track if P_PROTECT should be inherited by new child processes. Reviewed by: kib, jilles (earlier version) Approved by: re (delphij) MFC after: 1 month
2013-09-19 18:53:42 +00:00
.It Fl c
Remove protection from the specified processes.
.It Fl d
Apply the operation to all current children of the specified processes.
.It Fl i
Apply the operation to all future children of the specified processes.
.It Fl g Ar pgrp
Apply the operation to all processes in the specified process group.
.It Fl p Ar pid
Apply the operation to the specified process.
.It Ar command
Execute
.Ar command
as a protected process.
.El
.Pp
Note that only one of the
.Fl p
or
.Fl g
flags may be specified when adjusting the state of existing processes.
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
Mark the Xorg server as protected:
.Pp
.Dl "pgrep Xorg | xargs protect -p"
Minor mdoc improvements. Approved by: re (blanket)
2013-09-19 19:43:38 +00:00
.Pp
Extend the support for exempting processes from being killed when swap is exhausted. - Add a new protect(1) command that can be used to set or revoke protection from arbitrary processes. Similar to ktrace it can apply a change to all existing descendants of a process as well as future descendants. - Add a new procctl(2) system call that provides a generic interface for control operations on processes (as opposed to the debugger-specific operations provided by ptrace(2)). procctl(2) uses a combination of idtype_t and an id to identify the set of processes on which to operate similar to wait6(). - Add a PROC_SPROTECT control operation to manage the protection status of a set of processes. MADV_PROTECT still works for backwards compatability. - Add a p_flag2 to struct proc (and a corresponding ki_flag2 to kinfo_proc) the first bit of which is used to track if P_PROTECT should be inherited by new child processes. Reviewed by: kib, jilles (earlier version) Approved by: re (delphij) MFC after: 1 month
2013-09-19 18:53:42 +00:00
Protect all ssh sessions and their child processes:
.Pp
.Dl "pgrep sshd | xargs protect -dip"
Minor mdoc improvements. Approved by: re (blanket)
2013-09-19 19:43:38 +00:00
.Pp
Extend the support for exempting processes from being killed when swap is exhausted. - Add a new protect(1) command that can be used to set or revoke protection from arbitrary processes. Similar to ktrace it can apply a change to all existing descendants of a process as well as future descendants. - Add a new procctl(2) system call that provides a generic interface for control operations on processes (as opposed to the debugger-specific operations provided by ptrace(2)). procctl(2) uses a combination of idtype_t and an id to identify the set of processes on which to operate similar to wait6(). - Add a PROC_SPROTECT control operation to manage the protection status of a set of processes. MADV_PROTECT still works for backwards compatability. - Add a p_flag2 to struct proc (and a corresponding ki_flag2 to kinfo_proc) the first bit of which is used to track if P_PROTECT should be inherited by new child processes. Reviewed by: kib, jilles (earlier version) Approved by: re (delphij) MFC after: 1 month
2013-09-19 18:53:42 +00:00
Remove protection from all current and future processes:
.Pp
.Dl "protect -cdi -p 1"
.Sh SEE ALSO
Correct stale comments. Approved by: re (joel)
2013-09-20 16:05:09 +00:00
.Xr procctl 2
Extend the support for exempting processes from being killed when swap is exhausted. - Add a new protect(1) command that can be used to set or revoke protection from arbitrary processes. Similar to ktrace it can apply a change to all existing descendants of a process as well as future descendants. - Add a new procctl(2) system call that provides a generic interface for control operations on processes (as opposed to the debugger-specific operations provided by ptrace(2)). procctl(2) uses a combination of idtype_t and an id to identify the set of processes on which to operate similar to wait6(). - Add a PROC_SPROTECT control operation to manage the protection status of a set of processes. MADV_PROTECT still works for backwards compatability. - Add a p_flag2 to struct proc (and a corresponding ki_flag2 to kinfo_proc) the first bit of which is used to track if P_PROTECT should be inherited by new child processes. Reviewed by: kib, jilles (earlier version) Approved by: re (delphij) MFC after: 1 month
2013-09-19 18:53:42 +00:00
.Sh BUGS
If you protect a runaway process that allocates all memory the system will
deadlock.
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