libarchive/archive_entry_stat.3

.\" Copyright (c) 2010 Joerg Sonnenberger
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.Dd February 2, 2012
.Dt ARCHIVE_ENTRY_STAT 3
.Os
.Sh NAME
.Nm archive_entry_stat ,
.Nm archive_entry_copy_stat ,
.Nm archive_entry_filetype ,
.Nm archive_entry_set_filetype ,
.Nm archive_entry_mode ,
.Nm archive_entry_set_mode ,
.Nm archive_entry_size ,
.Nm archive_entry_size_is_set ,
.Nm archive_entry_set_size ,
.Nm archive_entry_unset_size ,
.Nm archive_entry_dev ,
.Nm archive_entry_set_dev ,
.Nm archive_entry_dev_is_set ,
.Nm archive_entry_devmajor ,
.Nm archive_entry_set_devmajor ,
.Nm archive_entry_devminor ,
.Nm archive_entry_set_devminor ,
.Nm archive_entry_ino ,
.Nm archive_entry_set_ino ,
.Nm archive_entry_ino_is_set ,
.Nm archive_entry_ino64 ,
.Nm archive_entry_set_ino64 ,
.Nm archive_entry_nlink ,
.Nm archive_entry_rdev ,
.Nm archive_entry_set_rdev ,
.Nm archive_entry_rdevmajor ,
.Nm archive_entry_set_rdevmajor ,
.Nm archive_entry_rdevminor ,
.Nm archive_entry_set_rdevminor ,
.Nd accessor functions for manipulating archive entry descriptions
.Sh LIBRARY
Streaming Archive Library (libarchive, -larchive)
.Sh SYNOPSIS
.In archive_entry.h
.Ft const struct stat *
.Fn archive_entry_stat "struct archive_entry *a"
.Ft void
.Fn archive_entry_copy_stat "struct archive_entry *a" "const struct stat *sb"
.Ft mode_t
.Fn archive_entry_filetype "struct archive_entry *a"
.Ft void
.Fn archive_entry_set_filetype "struct archive_entry *a" "unsigned int type"
.Ft mode_t
.Fn archive_entry_mode "struct archive_entry *a"
.Ft void
.Fn archive_entry_set_mode "struct archive_entry *a" "mode_t mode"
.Ft int64_t
.Fn archive_entry_size "struct archive_entry *a"
.Ft int
.Fn archive_entry_size_is_set "struct archive_entry *a"
.Ft void
.Fn archive_entry_set_size "struct archive_entry *a" "int64_t size"
.Ft void
.Fn archive_entry_unset_size "struct archive_entry *a"
.Ft dev_t
.Fn archive_entry_dev "struct archive_entry *a"
.Ft void
.Fn archive_entry_set_dev "struct archive_entry *a" "dev_t dev"
.Ft int
.Fn archive_entry_dev_is_set "struct archive_entry *a"
.Ft dev_t
.Fn archive_entry_devmajor "struct archive_entry *a"
.Ft void
.Fn archive_entry_set_devmajor "struct archive_entry *a" "dev_t major"
.Ft dev_t
.Fn archive_entry_devminor "struct archive_entry *a"
.Ft void
.Fn archive_entry_set_devminor "struct archive_entry *a" "dev_t minor"
.Ft ino_t
.Fn archive_entry_ino "struct archive_entry *a"
.Ft void
.Fn archive_entry_set_ino "struct archive_entry *a" "unsigned long ino"
.Ft int
.Fn archive_entry_ino_is_set "struct archive_entry *a"
.Ft int64_t
.Fn archive_entry_ino64 "struct archive_entry *a"
.Ft void
.Fn archive_entry_set_ino64 "struct archive_entry *a" "int64_t ino"
.Ft unsigned int
.Fn archive_entry_nlink "struct archive_entry *a"
.Ft void
.Fn archive_entry_set_nlink "struct archive_entry *a" "unsigned int count"
.Ft dev_t
.Fn archive_entry_rdev "struct archive_entry *a"
.Ft dev_t
.Fn archive_entry_rdevmajor "struct archive_entry *a"
.Ft dev_t
.Fn archive_entry_rdevminor "struct archive_entry *a"
.Ft void
.Fn archive_entry_set_rdev "struct archive_entry *a" "dev_t dev"
.Ft void
.Fn archive_entry_set_rdevmajor "struct archive_entry *a" "dev_t major"
.Ft void
.Fn archive_entry_set_rdevminor "struct archive_entry *a" "dev_t minor"
.Sh DESCRIPTION
.Ss Copying to and from Vt struct stat
The function
.Fn archive_entry_stat
converts the various fields stored in the archive entry to the format
used by
.Xr stat 2 .
The return value remains valid until either
.Fn archive_entry_clear
or
.Fn archive_entry_free
is called.
It is not affected by calls to the set accessor functions.
It currently sets the following values in
.Vt struct stat :
.Vt st_atime ,
.Vt st_ctime ,
.Vt st_dev ,
.Vt st_gid ,
.Vt st_ino ,
.Vt st_mode ,
.Vt st_mtime ,
.Vt st_nlink ,
.Vt st_rdev ,
.Vt st_size ,
.Vt st_uid .
In addition,
.Vt st_birthtime
and high-precision information for time-related fields
will be included on platforms that support it.
.Pp
The function
.Fn archive_entry_copy_stat
copies fields from the platform's
.Vt struct stat .
Fields not provided by
.Vt struct stat
are unchanged.
.Ss General accessor functions
The functions
.Fn archive_entry_filetype
and
.Fn archive_entry_set_filetype
get respectively set the filetype.
The file type is one of the following constants:
.Bl -tag -width "AE_IFSOCK" -compact -offset indent
.It AE_IFREG
Regular file
.It AE_IFLNK
Symbolic link
.It AE_IFSOCK
Socket
.It AE_IFCHR
Character device
.It AE_IFBLK
Block device
.It AE_IFDIR
Directory
.It AE_IFIFO
Named pipe (fifo)
.El
Not all file types are supported by all platforms.
The constants used by
.Xr stat 2
may have different numeric values from the
corresponding constants above.
.Pp
The functions
.Fn archive_entry_mode
and
.Fn archive_entry_set_mode
get/set a combination of file type and permissions and provide the
equivalent of
.Va st_mode .
Use of
.Fn archive_entry_filetype
and
.Fn archive_entry_perm
for getting and
.Fn archive_entry_set_filetype
and
.Fn archive_entry_set_perm
for setting is recommended.
.Pp
The function
.Fn archive_entry_size
returns the file size, if it has been set, and 0 otherwise.
.Fn archive_entry_size
can be used to query that status.
.Fn archive_entry_set_size
and
.Fn archive_entry_unset_size
set and unset the size, respectively.
.Pp
The number of references (hardlinks) can be obtained by calling
.Fn archive_entry_nlinks
and set with
.Fn archive_entry_set_nlinks .
.Ss Identifying unique files
The functions
.Fn archive_entry_dev
and
.Fn archive_entry_ino64
are used by
.Xr archive_entry_linkify 3
to find hardlinks.
The pair of device and inode is supposed to identify hardlinked files.
.Pp
The device major and minor number can be obtained independently using
.Fn archive_entry_devmajor
and
.Fn archive_entry_devminor .
The device can be set either via
.Fn archive_entry_set_dev
or by the combination of major and minor number using
.Fn archive_entry_set_devmajor
and
.Fn archive_entry_set_devminor .
.Pp
The inode number can be obtained using
.Fn archive_entry_ino .
This is a legacy interface that uses the platform
.Vt ino_t ,
which may be very small.
To set the inode number,
.Fn archive_entry_set_ino64
is the preferred interface.
.Ss Accessor functions for block and character devices
Block and character devices are characterised either using a device number
or a pair of major and minor number.
The combined device number can be obtained with
.Fn archive_device_rdev
and set with
.Fn archive_device_set_rdev .
The major and minor numbers are accessed by
.Fn archive_device_rdevmajor ,
.Fn archive_device_rdevminor
.Fn archive_device_set_rdevmajor
and
.Fn archive_device_set_rdevminor .
.Pp
The process of splitting the combined device number into major and
minor number and the reverse process of combing them differs between
platforms.
Some archive formats use the combined form, while other formats use
the split form.
.Sh SEE ALSO
.Xr archive_entry_acl 3 ,
.Xr archive_entry_perms 3 ,
.Xr archive_entry_time 3 ,
.Xr libarchive 3 ,
.Xr stat 2