Provided by: systemtap-doc_4.2-3ubuntu0.1_all 

NAME
function::task_fd_lookup - get the file struct for a task's fd
SYNOPSIS
task_fd_lookup:long(task:long,fd:long)
ARGUMENTS
task
task_struct pointer.
fd
file descriptor number.
DESCRIPTION
Returns the file struct pointer for a task's file descriptor.
SystemTap Tapset Reference November 2019 FUNCTION::TASK_FD_LO(3stap)