.\"
.\" This file and its contents are supplied under the terms of the
.\" Common Development and Distribution License ("CDDL"), version 1.0.
.\" You may only use this file in accordance with the terms of version
.\" 1.0 of the CDDL.
.\"
.\" A full copy of the text of the CDDL should have accompanied this
.\" source.  A copy of the CDDL is also available via the Internet at
.\" http://www.illumos.org/license/CDDL.
.\"
.\"
.\" Copyright 2015 Joyent, Inc.
.\"
.Dd May 11, 2016
.Dt PISSYSCALL 3PROC
.Os
.Sh NAME
.Nm Pissyscall ,
.Nm Pissyscall_prev ,
.Nd determine if instructions are system call instructions
.Sh SYNOPSIS
.Lb libproc
.In libproc.h
.Ft int
.Fo Pissyscall
.Fa "struct ps_prochandle *P"
.Fa "uintptr_t addr"
.Fc
.Ft int
.Fo Pissyscall_prev
.Fa "struct ps_prochandle *P"
.Fa "uintptr_t addr"
.Fa "uintptr_t *dst"
.Fc
.Sh DESCRIPTION
The
.Fn Pissyscall
function determines whether or not the instructions at
.Fa addr
in the process handle
.Fa P
corresponds to one of the architecture's system call instructions.
.Pp
the
.Fn Pissyscall_prev
function determines whether or not the instruction before
.Fa addr
in the process handle
.Fa P
corresponds to one of the architecture's system call instructions. If it
does, and
.Fa dst
is a
.Pf non- Dv NULL
pointer, then the address of the system call instruction will be copied
into the location pointed to by
.Fa dst .
.Sh RETURN VALUES
Upon successful completion, the
.Fn Pissyscall
function returns
.Sy non-zero
if
.Fa addr
corresponds to a system call instruction. Otherwise,
.Sy 0
is returned.
.Pp
Upon successful completion, the
.Fn Pissyscall_prev
function returns
.Sy non-zero
if
.Fa addr
corresponds to a system call instruction and if
.Fa dst
is
.Pf non- Dv NULL ,
.Fa dst
is updated. Otherwise,
.Sy 0
is returned.
.Sh INTERFACE STABILITY
.Sy Uncommitted
.Sh MT-LEVEL
See
.Sy LOCKING
in
.Xr libproc 3LIB .
.Sh SEE ALSO
.Xr libproc 3LIB