FD2PATH(2)FD2PATH(2)NAME
fd2path - return file name associated with file descriptor
SYNOPSIS
include "sys.m";
sys := load Sys Sys->PATH;
fd2path(fd: ref FD): string;
DESCRIPTION
As described in intro(2), the kernel stores a rooted path name with
every open file or directory; typically, it is the name used in the
original access of the file. Fd2path returns the path name associated
with open file descriptor fd. (It returns nil if an error occurs.)
Changes to the underlying name space do not update the path name stored
with the file descriptor. Therefore, the path returned by fd2path may
no longer refer to the same file (or indeed any file) after some compo‐
nent directory or file in the path has been removed, renamed or
rebound.
As an example, workdir(2) is implemented by opening . and executing
fd2path on the resulting file descriptor.
SEE ALSObind(1), ns(1), sys-bind(2), sys-intro(2), workdir(2), prog(3)DIAGNOSTICS
Fd2path returns nil on error and sets the system error string.
FD2PATH(2)
