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 November 27, 2023 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 LIBRARY 21.Lb libproc 22.Sh SYNOPSIS 23.In libproc.h 24.Ft int 25.Fo pr_lseek 26.Fa "struct ps_prochandle *P" 27.Fa "int filedes" 28.Fa "off_t offset" 29.Fa "int whence" 30.Fc 31.Sh DESCRIPTION 32The 33.Fn pr_lseek 34function injects the 35.Xr lseek 2 36system call into the target process 37.Fa P 38by means of the agent LWP. 39If the process handle 40.Fa P 41is the value 42.Dv NULL 43then this will be equivalent to calling 44.Xr lseek 2 45on the currently running process. 46.Pp 47The arguments 48.Fa filedes , 49.Fa offset , 50and 51.Fa whence 52have the same meaning as in 53.Xr lseek 2 . 54See 55.Xr lseek 2 56for the full description and purpose of the 57.Sy lseek 58system call and its arguments. 59.Pp 60The 61.Fn pr_lseek 62function only works on active processes. 63Process handles that correspond to core files, zombie processes, or ELF objects 64do not support system call injection. 65.Sh RETURN VALUES 66Upon successful completion, the 67.Fn pr_lseek 68function's return value is that described in 69.Xr lseek 2 . 70Otherwise, 71.Sy -1 72is returned and 73.Sy errno 74is set to 75.Er ENOSYS 76to indicate that the system call could not be injected. 77.Sh ERRORS 78For the full list of errors see the 79.Sy ERRORS 80section in 81.Xr lseek 2 . 82.Pp 83The 84.Fn pr_lseek 85function will fail if: 86.Bl -tag -width Er 87.It Er ENOSYS 88An error occurred while trying to invoke the agent LWP and inject a 89system call in the process handle 90.Fa P 91or the process handle 92.Fa P 93does not support system call injection. 94.El 95.Sh INTERFACE STABILITY 96.Sy Uncommitted 97.Sh MT-LEVEL 98See 99.Sy LOCKING 100in 101.Xr libproc 3LIB . 102.Sh SEE ALSO 103.Xr lseek 2 , 104.Xr libproc 3LIB , 105.Xr proc 5 106