zip_register_progress_callback_with_state — provide updates during zip_close

       Dieter Baron <dillo@nih.at> and Thomas Klausner <wiz@gatalith.at>

Debian                                          December 18, 2017   ZIP_REGISTER_PROGRESS_CALLBACK_WITH_STATE(3)

       The zip_register_progress_callback_with_state() function registers a callback function callback  for  the
       zip  archive  archive.  The precision argument is a double in the range from 0.00 to 1.0 that defines the
       smallest change for which the callback should be called (to  avoid  too  frequent  calls).   The  ud_free
       function is called during cleanup for deleting the userdata supplied in ud.

       The  callback  function is called during zip_close(3) in regular intervals (after every zip archive entry
       that's completely written to disk, and while writing data for entries)  with  zip  archive  archive,  the
       current  progression state as a double, and the user-provided user-data ud as arguments.  The progression
       state is a double in the range from 0.0 to 1.0.  This can be used to provide progress indicators for user
       interfaces.

zip_register_progress_callback_with_state() was added in libzip 1.3.0.

       libzip (-lzip)

       zip_register_progress_callback_with_state — provide updates during zip_close

libzip(3), zip_close(3), zip_register_cancel_callback_with_state(3)

#include<zip.h>typedefvoid(*zip_progress_callback)(zip_t*,double,void*);voidzip_register_progress_callback_with_state(zip_t*archive,           doubleprecision,
           zip_progress_callbackcallback, void(*ud_free)(void*), void*ud);