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 PCTFLD 3PROC 16.Os 17.Sh NAME 18.Nm Pctlfd 19.Nd obtain the process control file descriptor 20.Sh SYNOPSIS 21.Lb libproc 22.In libproc.h 23.Ft int 24.Fo Pctlfd 25.Fa "struct ps_prochandle *P" 26.Fc 27.Sh DESCRIPTION 28The 29.Fn Pctlfd 30function returns a file descriptor to the underlying /proc file system 31.Sy ctl 32file for the process identified by the handle 33.Fa P . 34This may be used for injecting control operations manually; 35however, many interfaces for using it are provided by 36.Xr libproc 3LIB 37itself. 38.Pp 39Only live processes have a control file descriptor. 40Process handles that correspond to files and cores, created through 41.Xr Prab_file 3PROC 42and 43.Xr Pgrab_core 3PROC , 44do not have a corresponding file descriptor. 45.Pp 46The file descriptor is invalidated when the process handle is released 47through 48.Xr Prelease 3PROC 49or if control is lost and the handle is reopened. 50.Sh RETURN VALUES 51Upon successful completion, the 52.Fn Pctlfd 53function returns a valid file descriptor. 54Otherwise, if none exists, then 55.Sy -1 56is returned. 57.Sh INTERFACE STABILITY 58.Sy Uncommitted 59.Sh MT-LEVEL 60See 61.Sy LOCKING 62in 63.Xr libproc 3LIB . 64.Sh SEE ALSO 65.Xr libproc 3LIB , 66.Xr Pcreate 3PROC , 67.Xr Pgrab 3PROC , 68.Xr Pgrab_core 3PROC , 69.Xr Pgrab_file 3PROC , 70.Xr Prelease 3PROC , 71.Xr Preopen 3PROC , 72.Xr proc 4 73