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.\" zip_register_cancel_callback_with_state.mdoc -- allow cancelling during zip_close
.\" Copyright (C) 2021-2022 Dieter Baron and Thomas Klausner
.\"
.\" This file is part of libzip, a library to manipulate ZIP archives.
.\" The authors can be contacted at <libzip@nih.at>
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.Dd June 18, 2022
.Dt ZIP_REGISTER_CANCEL_CALLBACK_WITH_STATE 3
.Os
.Sh NAME
.Nm zip_register_cancel_callback_with_state
.Nd allow cancelling during zip_close
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Vt typedef int (*zip_cancel_callback)(zip_t *, void *);
.Ft void
.Fn zip_register_cancel_callback_with_state "zip_t *archive" "zip_cancel_callback callback" "void (*ud_free)(void *)" "void *ud"
.Sh DESCRIPTION
This function can be used to cancel writing of a zip archive during
.Xr zip_close 3 .
.Pp
The
.Fn zip_register_cancel_callback_with_state
function registers a callback function
.Ar callback
for the zip archive
.Ar archive .
The
.Ar ud_free
function is called during cleanup for deleting the userdata supplied in
.Ar ud .
.Pp
The callback function is called during
.Xr 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
.Ar archive
and the user-provided user-data
.Ar ud
as arguments.
When the callback function returns a non-zero value, writing is cancelled and
.Xr zip_close 3
returns an error.
.Pp
The callback function should be fast, since it will be called often.
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_close 3 ,
.Xr zip_register_progress_callback_with_state 3
.Sh HISTORY
.Fn zip_register_cancel_callback_with_state
was added in libzip 1.6.0.
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq Mt dillo@nih.at
and
.An Thomas Klausner Aq Mt tk@giga.or.at

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