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fd2path - return file name associated with file descriptor


include "sys.m";
sys := load Sys Sys->PATH;

fd2path(fd: ref FD): string;


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.


bind(1), ns(1), sys-bind(2), sys-intro(2), workdir(2), prog(3)


Fd2path returns nil on error and sets the system error string.

FD2PATH(2 ) Rev:  Tue Mar 31 02:42:38 GMT 2015