archive_entry_perms(3) Library Functions Manual archive_entry_perms(3)
NAME
archive_entry_gid, archive_entry_set_gid, archive_entry_uid,
archive_entry_set_uid, archive_entry_perm, archive_entry_set_perm,
archive_entry_strmode, archive_entry_uname, archive_entry_uname_w,
archive_entry_set_uname, archive_entry_copy_uname,
archive_entry_copy_uname_w, archive_entry_update_uname_utf8,
archive_entry_gname, archive_entry_gname_w, archive_entry_set_gname,
archive_entry_copy_gname, archive_entry_copy_gname_w,
archive_entry_update_gname_utf8, archive_entry_fflags,
archive_entry_fflags_text, archive_entry_set_fflags,
archive_entry_copy_fflags_text, archive_entry_copy_fflags_text_w -
functions for manipulating ownership and permissions in archive entry
descriptions
LIBRARY
Streaming Archive Library (libarchive, -larchive)
SYNOPSIS
#include <archive_entry.h>
gid_t
archive_entry_gid(struct archive_entry *a);
void
archive_entry_set_gid(struct archive_entry *a, gid_t gid);
uid_t
archive_entry_uid(struct archive_entry *a);
void
archive_entry_set_uid(struct archive_entry *a, uid_t uid);
mode_t
archive_entry_perm(struct archive_entry *a);
void
archive_entry_set_perm(struct archive_entry *a, mode_t mode);
const char *
archive_entry_strmode(struct archive_entry *a);
const char *
archive_entry_gname(struct archive_entry *a);
const wchar_t *
archive_entry_gname_w(struct archive_entry *a);
void
archive_entry_set_gname(struct archive_entry *a, const char *a);
void
archive_entry_copy_gname(struct archive_entry *a, const char *name);
void
archive_entry_copy_gname_w(struct archive_entry *a, const wchar_t *name);
int
archive_entry_update_gname_utf8(struct archive_entry *a,
const char *name);
const char *
archive_entry_uname(struct archive_entry *a);
const wchar_t *
archive_entry_uname_w(struct archive_entry *a);
void
archive_entry_set_uname(struct archive_entry *a, const char *name);
void
archive_entry_copy_uname(struct archive_entry *a, const char *name);
void
archive_entry_copy_uname_w(struct archive_entry *a, const wchar_t *name);
int
archive_entry_update_uname_utf8(struct archive_entry *a,
const char *name);
void
archive_entry_fflags(struct archive_entry *a, unsigned long *set_bits,
unsigned long *clear_bits);
const char *
archive_entry_fflags_text(struct archive_entry *a);
void
archive_entry_set_fflags(struct archive_entry *a, unsigned long set_bits,
unsigned long clear_bits);
const char *
archive_entry_copy_fflags_text(struct archive_entry *a,
const char *text);
const wchar_t *
archive_entry_copy_fflags_text_w(struct archive_entry *a,
const wchar_t *text);
DESCRIPTION
User id, group id and mode
The functions archive_entry_uid(), archive_entry_gid(), and
archive_entry_perm() can be used to extract the user id, group id and
permission from the given entry. The corresponding functions
archive_entry_set_uid(), archive_entry_set_gid(), and
archive_entry_set_perm() store the given user id, group id and permission
in the entry. The permission is also set as a side effect of calling
archive_entry_set_mode().
archive_entry_strmode() returns a string representation of the permission
as used by the long mode of ls(1).
User and group name
User and group names can be provided in one of three different ways:
char * Multibyte strings in the current locale.
wchar_t * Wide character strings in the current locale. The accessor
functions are named XXX_w().
UTF-8 Unicode strings encoded as UTF-8. These are convenience
functions to update both the multibyte and wide character
strings at the same time.
archive_entry_set_XXX() is an alias for archive_entry_copy_XXX(). The
strings are copied, and don't need to outlive the call.
File Flags
File flags are transparently converted between a bitmap representation
and a textual format. For example, if you set the bitmap and ask for
text, the library will build a canonical text format. However, if you
set a text format and request a text format, you will get back the same
text, even if it is ill-formed. If you need to canonicalize a textual
flags string, you should first set the text form, then request the bitmap
form, then use that to set the bitmap form. Setting the bitmap format
will clear the internal text representation and force it to be
reconstructed when you next request the text form.
The bitmap format consists of two integers, one containing bits that
should be set, the other specifying bits that should be cleared. Bits
not mentioned in either bitmap will be ignored. Usually, the bitmap of
bits to be cleared will be set to zero. In unusual circumstances, you
can force a fully-specified set of file flags by setting the bitmap of
flags to clear to the complement of the bitmap of flags to set. (This
differs from fflagstostr(3), which only includes names for set bits.)
Converting a bitmap to a textual string is a platform-specific operation;
bits that are not meaningful on the current platform will be ignored.
The canonical text format is a comma-separated list of flag names. The
archive_entry_copy_fflags_text() and archive_entry_copy_fflags_text_w()
functions parse the provided text and set the internal bitmap values.
This is a platform-specific operation; names that are not meaningful on
the current platform will be ignored. The function returns a pointer to
the start of the first name that was not recognized, or NULL if every
name was recognized. Note that every name -- including names that follow
an unrecognized name -- will be evaluated, and the bitmaps will be set to
reflect every name that is recognized. (In particular, this differs from
strtofflags(3), which stops parsing at the first unrecognized name.)
SEE ALSO
archive_entry(3), archive_entry_acl(3), archive_read_disk(3),
archive_write_disk(3), libarchive(3)
BUGS
The platform types uid_t and gid_t are often 16 or 32 bit wide. In this
case it is possible that the ids can not be correctly restored from
archives and get truncated.
macOS 14.7 February 2, 2012 macOS 14.7
libarchive 3.7.6 - Generated Thu Oct 3 15:09:50 CDT 2024