man/man3proc/Plwp_getregs.3proc

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 Copyright 2015 Joyent, Inc.

.Dd May 11, 2016
.Dt PLWP_GETREGS 3PROC
.Os
.Sh NAME
.Nm Plwp_getfpregs ,
.Nm Plwp_setfpregs ,
.Nm Plwp_getregs ,
.Nm Plwp_setregs
.Nd get and set thread registers
.Sh SYNOPSIS
.Lb libproc
n libproc.h .Ft int
.Fo Plwp_getfpregs
.Fa "struct ps_prochandle *P"
.Fa "lwpid_t lwpid"
.Fa "prfpregset_t *fpregs"
.Fc
.Ft int
.Fo Plwp_setfpregs
.Fa "struct ps_prochandle *P"
.Fa "lwpid_t lwpid"
.Fa "const prfpregset_t fpregs"
.Fc
.Ft int
.Fo Plwp_getregs
.Fa "struct ps_prochandle *P"
.Fa "lwpid_t lwpid"
.Fa "prpregset_t *gregs"
.Fc
.Ft int
.Fo Plwp_setregs
.Fa "struct ps_prochandle *P"
.Fa "lwpid_t lwpid"
.Fa "const prpregset_t gregs"
.Fc
.Sh DESCRIPTION
The
.Fn Plwp_getregs ,
.Fn Plwp_setregs ,
.Fn Plwp_getfpregs ,
and
.Fn Plwp_setfpregs
functions allow one to get and set the general purpose and floating
point registers from the thread
.Fa lwpid
in the process handle
.Fa P .
p
The
.Fn Plwp_getfpregs
function updates the structure pointed to by
.Fa fpregs
with the state and values of the floating point registers of the thread
specified by
.Fa lwpid .
p
The
.Fn Plwp_setfpregs
function updates the floating point registers of the thread specified by
.Fa lwpid
to the register state contained in
.Fa fpregs .
p
The
.Fn Plwp_getregs
function updates the structure pointed to by
.Fa gregs
with the state and values of the general purpose registers of the thread
specified by
.Fa lwpid.
p
The
.Fn Plwp_setregs
function updates the general purpose registers of the thread specified
by
.Fa lwpid
to the register state contained in
.Fa gregs .
p
Processes must be stopped before obtaining the register state of
individual threads. Processes may be stopped with
.Xr Pstop 3PROC .
The structures used for registers are described in
.Xr proc 4
and their defintions may be found in
n sys/regset.h . The definitions of these structures varies based on the architecture of
the system and the running process.
p
One may not set the register values of a process that is not an active
process, e.g. a process handle that refers to a file or a core file.
.Sh RETURN VALUES
Upon successful completion, the
.Fn Plwp_getregs ,
.Fn Plwp_setregs ,
.Fn Plwp_getfpregs ,
and
.Fn Plwp_setfpregs
functions return
.Sy 0
and obtain or set the register state. Otherwise,
.Sy -1
is returned,
.Sy errno
is set to indicate the error, and the register state is not updated nor
are the data pointers changed.
.Sh ERRORS
For a full list of possible errors also see the
.Sy DIAGNOSTICS
section in
.Xr proc 4 .
p
The
.Fn Plwp_getregs ,
.Fn Plwp_setregs ,
.Fn Plwp_getfpregs ,
and
.Fn Plwp_setfpregs
will fail if:
l -tag -width Er t Er EBUSY The process handle
.Fa P
is not currently stopped.
t Er ENOENT There is no thread in
.Fa P
with id
.Fa lwpid .
.El
.Sh INTERFACE STABILITY
.Sy Uncommitted
.Sh MT-LEVEL
See
.Sy LOCKING
in
.Xr libproc 3LIB .
.Sh SEE ALSO
.Xr libproc 3LIB ,
.Xr proc 4