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 LIBRARY 21.Lb libproc 22.Sh SYNOPSIS 23.In libproc.h 24.Ft int 25.Fo Preopen 26.Fa "struct ps_prochandle *P" 27.Fc 28.Sh DESCRIPTION 29The 30.Fn Preopen 31function is used to regain control of the process represented by the 32handle 33.Fa P . 34A loss of control is indicated by the 35.Xr Pstatus 3PROC 36function returning the value 37.Dv PS_LOST . 38This may occur when the controlled process performs an 39.Xr exec 2 40of a setuid or setgid binary or one where the controlling process cannot 41read the object file. 42For more information on this, see the 43.Sy PROGRAMMING NOTES 44section of 45.Xr proc 5 . 46.Pp 47If successful, the controlling process will obtain control of the 48process specified by 49.Fa P . 50If it fails, the controlling process should release the handle with 51.Xr Prelease 3PROC . 52Note there are occasions where due to permissions it may not be possible 53to obtain control again. 54.Sh RETURN VALUES 55Upon successful completion, the 56.Fn Preopen 57function returns 58.Sy 0. 59Otherwise, 60.Sy -1 61is returned. 62.Sh INTERFACE STABILITY 63.Sy Uncommitted 64.Sh MT-LEVEL 65See 66.Sy LOCKING 67in 68.Xr libproc 3LIB . 69.Sh SEE ALSO 70.Xr exec 2 , 71.Xr libproc 3LIB , 72.Xr Prelease 3PROC , 73.Xr Pstatus 3PROC , 74.Xr proc 5 75