1.\" 2.\" Copyright (c) 2016 3.\" The DragonFly Project. All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in 13.\" the documentation and/or other materials provided with the 14.\" distribution. 15.\" 3. Neither the name of The DragonFly Project nor the names of its 16.\" contributors may be used to endorse or promote products derived 17.\" from this software without specific, prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22.\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23.\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24.\" INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 25.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 27.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 29.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.Dd March 7, 2016 33.Dt EXEC_SYS_REGISTER 2 34.Os 35.Sh NAME 36.Nm exec_sys_register , 37.Nm exec_sys_unregister 38.Nd register/unregister for resident execution 39.Sh LIBRARY 40.Lb libc 41.Sh SYNOPSIS 42.In sys/resident.h 43.Ft int 44.Fn exec_sys_register "void *entry" 45.Ft int 46.Fn exec_sys_unregister "int id" 47.Sh DESCRIPTION 48The 49.Fn exec_sys_register 50system call registers the binary of the calling process for resident 51execution. 52This snapshots the vmspace and causes future 53.Fn exec Ns s 54of the specified binary to use the snapshot directly rather than load 55and relocate a new copy. 56.Pp 57The 58.Fn exec_sys_unregister 59system call unregisters a resident binary identified by 60.Ar id , 61or the binary of the calling process if 62.Ar id 63is -1 , 64or all registered binaries if 65.Ar id 66is -2. 67.Pp 68Both can only be done by the superuser. 69.Sh RETURN VALUES 70.Rv -std exec_sys_register exec_sys_unregister 71.Sh ERRORS 72The 73.Fn exec_sys_register 74system call will fail if one of the following occurs: 75.Bl -tag -width Er 76.It Bq Er EEXIST 77The binary is already resident. 78.It Bq Er ENOENT 79No associated vnode exists. 80.It Bq Er EPERM 81The caller does not have sufficient permissions. 82.El 83.Pp 84The 85.Fn exec_sys_unregister 86system call will fail if one of the following occurs: 87.Bl -tag -width Er 88.It Bq Er ENOENT 89The specified 90.Fa id 91could not be found. 92.It Bq Er EPERM 93The caller does not have sufficient permissions. 94.El 95.Sh SEE ALSO 96.Xr resident 8 97.Sh HISTORY 98The 99.Nm 100and 101.Nm exec_sys_unregister 102system calls first appeared in 103.Dx 1.0 . 104.Sh AUTHORS 105.An -nosplit 106The 107.Nm 108and 109.Nm exec_sys_unregister 110system calls were written by 111.An Matthew Dillon 112and this manual page was written by 113.An Sascha Wildner . 114