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Copyright 2015 Joyent, Inc.

.Dd May 11, 2016 .Dt PREOPEN 3PROC .Os .Sh NAME .Nm Preopen .Nd reopen a process .Sh SYNOPSIS .Lb libproc n libproc.h .Ft int .Fo Preopen .Fa "struct ps_prochandle *P" .Fc .Sh DESCRIPTION The .Fn Preopen function is used to regain control of the process represented by the handle .Fa P . A loss of control is indicated by the .Xr Pstatus 3PROC function returning the value .Dv PS_LOST . This may occur when the controlled process performs an .Xr exec 2 of a setuid or setgid binary or one where the controlling process cannot read the object file. For more information on this, see the .Sy PROGRAMMING NOTES section of .Xr proc 4 .

p If successful, the controlling process will obtain control of the process specified by .Fa P . If it fails, the controlling process should release the handle with .Xr Prelease 3PROC . Note there are occasions where due to permissions it may not be possible to obtain control again. .Sh RETURN VALUES Upon successful completion, the .Fn Preopen function returns .Sy 0. Otherwise, .Sy -1 is returned. .Sh INTERFACE STABILITY .Sy Uncommitted .Sh MT-LEVEL See .Sy LOCKING in .Xr libproc 3LIB . .Sh SEE ALSO .Xr exec 2 , .Xr libproc 3LIB , .Xr Prelease 3PROC , .Xr Pstatus 3PROC , .Xr proc 4