1.\" 2.\" This file and its contents are supplied under the terms of the 3.\" Common Development and Distribution License ("CDDL"), version 1.0. 4.\" You may only use this file in accordance with the terms of version 5.\" 1.0 of the CDDL. 6.\" 7.\" A full copy of the text of the CDDL should have accompanied this 8.\" source. A copy of the CDDL is also available via the Internet at 9.\" http://www.illumos.org/license/CDDL. 10.\" 11.\" 12.\" Copyright 2015 Joyent, Inc. 13.\" 14.Dd May 11, 2016 15.Dt PR_LSEEK 3PROC 16.Os 17.Sh NAME 18.Nm pr_lseek 19.Nd inject lseek system call into victim process 20.Sh SYNOPSIS 21.Lb libproc 22.In libproc.h 23.Ft int 24.Fo pr_lseek 25.Fa "struct ps_prochandle *P" 26.Fa "int filedes" 27.Fa "off_t offset" 28.Fa "int whence" 29.Fc 30.Sh DESCRIPTION 31The 32.Fn pr_lseek 33function injects the 34.Xr lseek 2 35system call into the target process 36.Fa P 37by means of the agent LWP. 38If the process handle 39.Fa P 40is the value 41.Dv NULL 42then this will be equivalent to calling 43.Xr lseek 2 44on the currently running process. 45.Pp 46The arguments 47.Fa filedes , 48.Fa offset , 49and 50.Fa whence 51have the same meaning as in 52.Xr lseek 2 . 53See 54.Xr lseek 2 55for the full description and purpose of the 56.Sy lseek 57system call and its arguments. 58.Pp 59The 60.Fn pr_lseek 61function only works on active processes. 62Process handles that correspond to core files, zombie processes, or ELF objects 63do not support system call injection. 64.Sh RETURN VALUES 65Upon successful completion, the 66.Fn pr_lseek 67function's return value is that described in 68.Xr lseek 2 . 69Otherwise, 70.Sy -1 71is returned and 72.Sy errno 73is set to 74.Er ENOSYS 75to indicate that the system call could not be injected. 76.Sh ERRORS 77For the full list of errors see the 78.Sy ERRORS 79section in 80.Xr lseek 2 . 81.Pp 82The 83.Fn pr_lseek 84function will fail if: 85.Bl -tag -width Er 86.It Er ENOSYS 87An error occurred while trying to invoke the agent LWP and inject a 88system call in the process handle 89.Fa P 90or the process handle 91.Fa P 92does not support system call injection. 93.El 94.Sh INTERFACE STABILITY 95.Sy Uncommitted 96.Sh MT-LEVEL 97See 98.Sy LOCKING 99in 100.Xr libproc 3LIB . 101.Sh SEE ALSO 102.Xr lseek 2 , 103.Xr libproc 3LIB , 104.Xr proc 4 105