man.postnix Miscellaneous man pages of Plan 9 related material

     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 component 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 ALSO
          bind(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.

     Page 1                       Plan 9            (printed 11/17/24)