Preopen —
reopen a process
Process Control Library (libproc, -lproc)
#include
<libproc.h>
int
Preopen(
struct
ps_prochandle *P);
The
Preopen() function is used to regain
control of the process represented by the handle
P. A loss of control is indicated by the
Pstatus(3PROC) function returning the value
PS_LOST. This may occur when the controlled
process performs an
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
PROGRAMMING
NOTES section of
proc(4).
If successful, the controlling process will obtain control of the process
specified by
P. If it fails, the controlling
process should release the handle with
Prelease(3PROC). Note there are occasions where
due to permissions it may not be possible to obtain control again.
Upon successful completion, the
Preopen()
function returns
0. Otherwise,
-1 is returned.
Uncommitted
See
LOCKING in
libproc(3LIB).
exec(2),
libproc(3LIB),
Prelease(3PROC),
Pstatus(3PROC),
proc(4)