1.\" 2.\" This file and its contents are supplied under the terms of the 3.\" Common Development and Distribution License ("CDDL"), version 1.0. 4.\" You may only use this file in accordance with the terms of version 5.\" 1.0 of the CDDL. 6.\" 7.\" A full copy of the text of the CDDL should have accompanied this 8.\" source. A copy of the CDDL is also available via the Internet at 9.\" http://www.illumos.org/license/CDDL. 10.\" 11.\" 12.\" Copyright 2015 Joyent, Inc. 13.\" 14.Dd May 11, 2016 15.Dt PREOPEN 3PROC 16.Os 17.Sh NAME 18.Nm Preopen 19.Nd reopen a process 20.Sh SYNOPSIS 21.Lb libproc 22.In libproc.h 23.Ft int 24.Fo Preopen 25.Fa "struct ps_prochandle *P" 26.Fc 27.Sh DESCRIPTION 28The 29.Fn Preopen 30function is used to regain control of the process represented by the 31handle 32.Fa P . 33A loss of control is indicated by the 34.Xr Pstatus 3PROC 35function returning the value 36.Dv PS_LOST . 37This may occur when the controlled process performs an 38.Xr exec 2 39of a setuid or setgid binary or one where the controlling process cannot 40read the object file. For more information on this, see the 41.Sy PROGRAMMING NOTES 42section of 43.Xr proc 4 . 44.Pp 45If successful, the controlling process will obtain control of the 46process specified by 47.Fa P . 48If it fails, the controlling process should release the handle with 49.Xr Prelease 3PROC . 50Note there are occasions where due to permissions it may not be possible 51to obtain control again. 52.Sh RETURN VALUES 53Upon successful completion, the 54.Fn Preopen 55function returns 56.Sy 0. 57Otherwise, 58.Sy -1 59is returned. 60.Sh INTERFACE STABILITY 61.Sy Uncommitted 62.Sh MT-LEVEL 63See 64.Sy LOCKING 65in 66.Xr libproc 3LIB . 67.Sh SEE ALSO 68.Xr exec 2 , 69.Xr libproc 3LIB , 70.Xr Prelease 3PROC , 71.Xr Pstatus 3PROC , 72.Xr proc 4 73