143051d27SRobert Mustacchi.\" 243051d27SRobert Mustacchi.\" This file and its contents are supplied under the terms of the 343051d27SRobert Mustacchi.\" Common Development and Distribution License ("CDDL"), version 1.0. 443051d27SRobert Mustacchi.\" You may only use this file in accordance with the terms of version 543051d27SRobert Mustacchi.\" 1.0 of the CDDL. 643051d27SRobert Mustacchi.\" 743051d27SRobert Mustacchi.\" A full copy of the text of the CDDL should have accompanied this 843051d27SRobert Mustacchi.\" source. A copy of the CDDL is also available via the Internet at 943051d27SRobert Mustacchi.\" http://www.illumos.org/license/CDDL. 1043051d27SRobert Mustacchi.\" 1143051d27SRobert Mustacchi.\" 1243051d27SRobert Mustacchi.\" Copyright 2015 Joyent, Inc. 1343051d27SRobert Mustacchi.\" 1443051d27SRobert Mustacchi.Dd May 11, 2016 1543051d27SRobert Mustacchi.Dt PLWP_STACK 3PROC 1643051d27SRobert Mustacchi.Os 1743051d27SRobert Mustacchi.Sh NAME 1843051d27SRobert Mustacchi.Nm Plwp_stack , 1943051d27SRobert Mustacchi.Nm Plwp_alt_stack , 2043051d27SRobert Mustacchi.Nm Plwp_main_stack , 2143051d27SRobert Mustacchi.Nm Lstack , 2243051d27SRobert Mustacchi.Nm Lalt_stack , 2343051d27SRobert Mustacchi.Nm Lmain_stack 2443051d27SRobert Mustacchi.Nd get thread stack information 25ab618543SJohn Levon.Sh LIBRARY 2643051d27SRobert Mustacchi.Lb libproc 27ab618543SJohn Levon.Sh SYNOPSIS 2843051d27SRobert Mustacchi.In libproc.h 2943051d27SRobert Mustacchi.Ft int 3043051d27SRobert Mustacchi.Fo Plwp_stack 3143051d27SRobert Mustacchi.Fa "struct ps_prochandle *P" 3243051d27SRobert Mustacchi.Fa "lwpid_t lwpid" 3343051d27SRobert Mustacchi.Fa "stack_t *stkp" 3443051d27SRobert Mustacchi.Fc 3543051d27SRobert Mustacchi.Ft int 3643051d27SRobert Mustacchi.Fo Plwp_alt_stack 3743051d27SRobert Mustacchi.Fa "struct ps_prochandle *P" 3843051d27SRobert Mustacchi.Fa "lwpid_t lwpid" 3943051d27SRobert Mustacchi.Fa "stack_t *stkp" 4043051d27SRobert Mustacchi.Fc 4143051d27SRobert Mustacchi.Ft int 4243051d27SRobert Mustacchi.Fo Plwp_main_stack 4343051d27SRobert Mustacchi.Fa "struct ps_prochandle *P" 4443051d27SRobert Mustacchi.Fa "lwpid_t lwpid" 4543051d27SRobert Mustacchi.Fa "stack_t *stkp" 4643051d27SRobert Mustacchi.Fc 4743051d27SRobert Mustacchi.Ft int 4843051d27SRobert Mustacchi.Fo Lalt_stack 4943051d27SRobert Mustacchi.Fa "struct ps_lwphandle *L" 5043051d27SRobert Mustacchi.Fa "stack_t *stkp" 5143051d27SRobert Mustacchi.Fc 5243051d27SRobert Mustacchi.Ft int 5343051d27SRobert Mustacchi.Fo Lmain_stack 5443051d27SRobert Mustacchi.Fa "struct ps_lwphandle *L" 5543051d27SRobert Mustacchi.Fa "stack_t *stkp" 5643051d27SRobert Mustacchi.Fc 5743051d27SRobert Mustacchi.Ft int 5843051d27SRobert Mustacchi.Fo Lstack 5943051d27SRobert Mustacchi.Fa "struct ps_lwphandle *L" 6043051d27SRobert Mustacchi.Fa "stack_t *stkp" 6143051d27SRobert Mustacchi.Fc 6243051d27SRobert Mustacchi.Sh DESCRIPTION 6343051d27SRobert MustacchiThe 6443051d27SRobert Mustacchi.Fn Plwp_stack , 6543051d27SRobert Mustacchi.Fn Plwp_alt_stack , 6643051d27SRobert Mustacchiand 6743051d27SRobert Mustacchi.Fn Plwp_main_stack 6843051d27SRobert Mustacchifunctions obtain information about the size and address of the stacks 6943051d27SRobert Mustacchifor the thread identified by 7043051d27SRobert Mustacchi.Fa lwpid 7143051d27SRobert Mustacchiin the process handle 7243051d27SRobert Mustacchi.Fa P . 7343051d27SRobert Mustacchi.Pp 7443051d27SRobert MustacchiEach thread in a process has its own stack which is used both for 7543051d27SRobert Mustacchimaintaining function call sequences and the storing of local variables. 7643051d27SRobert MustacchiA thread may also configure a different stack to handle specific 7772d3dbb9SYuri Pankovsignals. 7872d3dbb9SYuri PankovThis stack is often called the 7943051d27SRobert Mustacchi.Em alternate stack . 8043051d27SRobert MustacchiWhether or not the alternate stack is used may be controlled through the 8143051d27SRobert Mustacchi.Xr sigaction 2 8243051d27SRobert Mustacchiand 8343051d27SRobert Mustacchi.Xr sigaltstack 2 8443051d27SRobert Mustacchifunctions . 8543051d27SRobert Mustacchi.Pp 8643051d27SRobert MustacchiThe 8743051d27SRobert Mustacchi.Fn Plwp_stack 8843051d27SRobert Mustacchifunction fills in 8943051d27SRobert Mustacchi.Fa stkp 9043051d27SRobert Mustacchiwith the information about the thread's currently executing stack, 9143051d27SRobert Mustacchiwhether the alternate or main one. 9243051d27SRobert Mustacchi.Pp 9343051d27SRobert MustacchiThe 9443051d27SRobert Mustacchi.Fn Plwp_alt_stack 9543051d27SRobert Mustacchifunction fills in 9643051d27SRobert Mustacchi.Fa stkp 9743051d27SRobert Mustacchiwith the information about the thread's alternate stack, if it's 9843051d27SRobert Mustacchiconfigured. 9943051d27SRobert Mustacchi.Pp 10043051d27SRobert MustacchiThe 10143051d27SRobert Mustacchi.Fn Plwp_main_stack 10243051d27SRobert Mustacchifunction fills in 10343051d27SRobert Mustacchi.Fa stkp 10443051d27SRobert Mustacchiwith the information about the thread's main stack, regardless of if there 10543051d27SRobert Mustacchiis an alternate stack or it is executing one. 10643051d27SRobert Mustacchi.Pp 10743051d27SRobert MustacchiProcess handles that refer to files, obtained through 10843051d27SRobert Mustacchi.Xr Pgrab_file 3PROC , 10943051d27SRobert Mustacchido not have any stack information and these functions will always fail 11043051d27SRobert Mustacchion them. 11143051d27SRobert Mustacchi.Pp 11243051d27SRobert MustacchiThe 11343051d27SRobert Mustacchi.Fn Lalt_stack , 11443051d27SRobert Mustacchi.Fn Lmain_stack , 11543051d27SRobert Mustacchiand 11643051d27SRobert Mustacchi.Fn Lstack 11743051d27SRobert Mustacchifunctions are identical to the 11843051d27SRobert Mustacchi.Fn Plwp_alt_stack , 11943051d27SRobert Mustacchi.Fn Plwp_main_stack , 12043051d27SRobert Mustacchiand 12143051d27SRobert Mustacchi.Fn Plwp_main_stack 12243051d27SRobert Mustacchifunctions, except rather than specifying a thread to operate on, they 12343051d27SRobert Mustacchioperate on the thread handle 12443051d27SRobert Mustacchi.Fa L , 12543051d27SRobert Mustacchiwhich specifies the thread to operate on. 12643051d27SRobert Mustacchi.Sh RETURN VALUES 12743051d27SRobert MustacchiUpon successful completion, the 12843051d27SRobert Mustacchi.Fn Plwp_stack , 12943051d27SRobert Mustacchi.Fn Plwp_alt_stack , 13043051d27SRobert Mustacchi.Fn Plwp_main_stack , 13143051d27SRobert Mustacchi.Fn Lalt_stack , 13243051d27SRobert Mustacchi.Fn Lmain_stack , 13343051d27SRobert Mustacchiand 13443051d27SRobert Mustacchi.Fn Lstack 13543051d27SRobert Mustacchifunctions return 13643051d27SRobert Mustacchi.Sy 0 13743051d27SRobert Mustacchiand fills in 13843051d27SRobert Mustacchi.Fa stkp 13972d3dbb9SYuri Pankovwith information about the appropriate stack. 14072d3dbb9SYuri PankovOtherwise, 14143051d27SRobert Mustacchi.Sy -1 14243051d27SRobert Mustacchiis returned, 14343051d27SRobert Mustacchi.Sy errno 14443051d27SRobert Mustacchiis updated with the error, and 14543051d27SRobert Mustacchi.Fa stkp 14643051d27SRobert Mustacchiis not modified. 14743051d27SRobert Mustacchi.Sh ERRORS 14843051d27SRobert MustacchiFor a full list of possible errors also see the 14943051d27SRobert Mustacchi.Sy DIAGNOSTICS 15043051d27SRobert Mustacchisection in 151*bbf21555SRichard Lowe.Xr proc 5 . 15243051d27SRobert Mustacchi.Pp 15343051d27SRobert MustacchiThe 15443051d27SRobert Mustacchi.Fn Plwp_stack , 15543051d27SRobert Mustacchi.Fn Plwp_alt_stack , 15643051d27SRobert Mustacchiand 15743051d27SRobert Mustacchi.Fn Plwp_main_stack 15843051d27SRobert Mustacchifunction will fail if: 15943051d27SRobert Mustacchi.Bl -tag -width Er 16043051d27SRobert Mustacchi.It Er ENODATA 16143051d27SRobert MustacchiThe process handle 16243051d27SRobert Mustacchi.Fa P 16343051d27SRobert Mustacchirefers to a grabbed file, not an active process or core. 16443051d27SRobert Mustacchi.It Er EINVAL 16543051d27SRobert MustacchiThe process handle 16643051d27SRobert Mustacchi.Fa P 16743051d27SRobert Mustacchirefers to a core file and the specified thread does not exist. 16843051d27SRobert Mustacchi.It Er ENOENT 16943051d27SRobert MustacchiThe process handle 17043051d27SRobert Mustacchi.Fa P 17143051d27SRobert Mustacchirefers to an active process and the specified thread does not exist. 17243051d27SRobert Mustacchi.El 17343051d27SRobert Mustacchi.Pp 17443051d27SRobert MustacchiThe 17543051d27SRobert Mustacchi.Fn Plwp_alt_stack 17643051d27SRobert Mustacchiand 17743051d27SRobert Mustacchi.Fn Lalt_stack 17843051d27SRobert Mustacchifunctions will fail if: 17943051d27SRobert Mustacchi.Bl -tag -width Er 18043051d27SRobert Mustacchi.It Er ENODATA 18143051d27SRobert MustacchiThe thread identified by 18243051d27SRobert Mustacchi.Fa lwpid 18343051d27SRobert Mustacchidid not have an alternate stack enabled. 18443051d27SRobert Mustacchi.El 18543051d27SRobert Mustacchi.Sh INTERFACE STABILITY 18643051d27SRobert Mustacchi.Sy Uncommitted 18743051d27SRobert Mustacchi.Sh MT-LEVEL 18843051d27SRobert MustacchiSee 18943051d27SRobert Mustacchi.Sy LOCKING 19043051d27SRobert Mustacchiin 19143051d27SRobert Mustacchi.Xr libproc 3LIB . 19243051d27SRobert Mustacchi.Sh SEE ALSO 19343051d27SRobert Mustacchi.Xr sigaction 2 , 19443051d27SRobert Mustacchi.Xr sigaltstack 2 , 19543051d27SRobert Mustacchi.Xr libproc 3LIB , 196*bbf21555SRichard Lowe.Xr proc 5 197