zip_fdopen.mdoc

.\" zip_fdopen.mdoc -- open zip archive using existing file descriptor
.\" Copyright (C) 2009-2017 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 December 18, 2017
.Dt ZIP_FDOPEN 3
.Os
.Sh NAME
.Nm zip_fdopen
.Nd open zip archive using open file descriptor
.Sh LIBRARY
libzip (-lzip)
.Sh SYNOPSIS
.In zip.h
.Ft zip_t *
.Fn zip_fdopen "int fd" "int flags" "int *errorp"
.Sh DESCRIPTION
The zip archive specified by the open file descriptor
.Ar fd
is opened and a pointer to a
.Ft struct zip ,
used to manipulate the archive, is returned.
In contrast to
.Xr zip_open 3 ,
using
.Nm zip_fdopen
the archive can only be opened in read-only mode.
The
.Ar fd
argument may not be used any longer after calling
.Nm zip_fdopen .
The
.Fa flags
are specified by
.Em or Ns No 'ing
the following values, or 0 for none of them.
.Bl -tag -offset indent -width ZIP_CHECKCONS
.It Dv ZIP_CHECKCONS
Perform additional stricter consistency checks on the archive, and
error if they fail.
.El
.Pp
If an error occurs and
.Ar errorp
is
.No non- Ns Dv NULL ,
it will be set to the corresponding error code.
.Sh RETURN VALUES
Upon successful completion
.Fn zip_fdopen
returns a
.Ft struct zip
pointer, and
.Ar fd
should not be used any longer, nor passed to
.Xr close 2 .
Otherwise,
.Dv NULL
is returned and
.Ar *errorp
is set to indicate the error.
In the error case,
.Ar fd
remains unchanged.
.Sh ERRORS
The file specified by
.Ar fd
is prepared for use by
.Xr libzip 3
unless:
.Bl -tag -width Er
.It Bq Er ZIP_ER_INCONS
Inconsistencies were found in the file specified by
.Ar path .
This error is often caused by specifying
.Dv ZIP_CHECKCONS
but can also happen without it.
.It Bq Er ZIP_ER_INVAL
The
.Ar flags
argument is invalid.
Not all
.Xr zip_open 3
flags are allowed for
.Nm zip_fdopen ,
see
.Sx DESCRIPTION .
.It Bq Er ZIP_ER_MEMORY
Required memory could not be allocated.
.It Bq Er ZIP_ER_NOZIP
The file specified by
.Ar fd
is not a zip archive.
.It Bq Er ZIP_ER_OPEN
The file specified by
.Ar fd
could not be prepared for use by
.Xr libzip 3 .
.It Bq Er ZIP_ER_READ
A read error occurred; see
.Va errno
for details.
.It Bq Er ZIP_ER_SEEK
The file specified by
.Ar fd
does not allow seeks.
.El
.Sh SEE ALSO
.Xr libzip 3 ,
.Xr zip_close 3 ,
.Xr zip_error_strerror 3 ,
.Xr zip_open 3
.Sh HISTORY
.Fn zip_fdopen
was added in libzip 1.0.
.Sh AUTHORS
.An -nosplit
.An Dieter Baron Aq Mt dillo@nih.at
and
.An Thomas Klausner Aq Mt tk@giga.or.at