The s6-fdholder-list program
s6-fdholder-list lists the descriptors currently held by a
s6-fdholder-list [ -t timeout ] path
- s6-fdholder-list connects to a
s6-fdholderd server process listening on
- It gets the list of identifiers corresponding to the currently held
file descriptors. It prints this list to stdout, one per line.
- -t timeout : if the operation cannot be
processed in timeout milliseconds, then fail with an error message.
Communications with the server should be near-instant, so this option is
only here to protect users against programming errors (connecting to the
wrong socket, for instance).
- 0: success.
- 1: the server denied the operation. The meaning of the error messages
is explained here.
- 100: wrong usage.
- 111: system call failed - this includes attempting to connect to a
nonexistent socket, or one where no s6-fdholderd
daemon is listening.