Provided by: atfs-dev_1.4pl6-16.1build1_amd64 
NAME
af_retattr, af_retnumattr, af_retuserattr, af_rettimeattr, af_setattr, af_allattrs, af_isstdval,
af_freeattr, af_freeattrbuf - AtFS attribute handling
SYNOPSIS
#include <atfs.h>
char *af_retattr (Af_key *aso, char *attrName)
int af_retnumattr (Af_key *aso, char *attrName)
Af_useraf_retuserattr (Af_key *aso, char *attrName)
time_taf_rettimeattr (Af_key *aso, char *attrName)
int af_setattr (Af_key *aso, int mode, char *attrName)
int af_allattrs (Af_key *aso, Af_attrs *attrBuf)
void af_freeattr (char *attrValue);
void af_freeattrbuf (Af_attrs *attrBuf);
int af_isstdval (char *attrValue);
DESCRIPTION
af_retattr returns the value of any ASO attribute in string representation. The attrName argument denotes
either a standard attribute (according to the list below) or a user defined attribute. Standard
attributes are converted to a meaningful string representation if necessary. If the attribute name given
to af_retattr contains an equal sign (this may be the case with user defined attributes), only the part
before the equal sign will be interpreted as name. If the named attribute is a user defined attribute
carrying multiple values, these will be returned in one string, with the values separated by newline
('\n') characters. If the named attribute does not exist, af_retattr returns a null pointer. If the value
is empty, an empty string is returned. Note: The result string of af_retattr may reside in static memory
which is overwritten on subsequent calls of af_retattr.
af_retnumattr, af_retuserattr, and af_rettimeattr return the value of the named attribute as integer,
user structure or time value. These functions only apply to standard attributes with a matching type.
Af_setattr sets, modifies, or deletes user defined attributes of the ASO identified by aso. The attr
parameter is a string of the form: name=value. The name may consist of any characters (even
non-printable) but it may not contain Ctrl-A (\001) characters. The first equal sign that appears in the
string is interpreted as the delimiter between name and value. If the string does not contain an equal
sign, it is interpreted as just an attribute name without value. The mode parameter is one of the
following:
AF_ADD Attach the given attribute to the identified ASO. If an attribute with the given name already
exists, add just the value to the existing attribute. Subsequent calls of af_setattr with the
same attribute name construct attributes with multiple (any number) values.
AF_REMOVE
Remove the named attribute. This mode requires only the attribute name to be given as attr
parameter. Removal of single values is not supported.
AF_REPLACE
Replace an existing user defined attribute. The replacement fails, if no attribute with the
given name exists.
af_allattrs returns the complete attribute buffer (attrBuf) of the ASO identified by aso including
standard and user defined attributes. The af_retrieve(3) manual page shows the structure of the attribute
buffer.
af_freeattr and af_freeattrbuf release memory eventually allocated during a af_retattr or af_allattrs
call. As the result of af_retattr may reside either in static or dynamic (malloc(3)) memory, you should
not use free(3) for releasing attribute value memory.
af_isstdval returns TRUE if the given attrValue string is the return value of an af_retattr call where
the result was written to static rather than allocated memory. Otherwise it returns FALSE.
AtFS STANDARD ATTRIBUTES
The following is an alphabetically ordered list of all known standard attributes. AF_ATT... are string
constants that may be used as attrName argument for any of the function calls described on this manual
page. In parenthesis behind each symbolic constant, the type of the attribute is shown.
AF_ATTAUTHOR (user)
The versions author.
AF_ATTATIME (time)
The date of last access (read or write) to the version contents.
AF_ATTBOUND (string)
The version name in bound version notation (e.g. foo.c[1.2]).
AF_ATTBOUNDPATH (string)
Absolute pathname of the version in bound version notation (e.g.
/usr/andy/foo.c[1.2]).
AF_ATTCTIME (time)
The date of last status change. Updated, when an attributes value is changed.
AF_ATTDSIZE (numeric)
The size of the delta if there is any. If the version is not stored as delta, -1 is
returned.
AF_ATTGEN (numeric)
The generation number.
AF_ATTHOST (string)
The host from where the version was accessed (this attribute is quite useless, as this
is always the current host).
AF_ATTLOCKER (user)
The user who has set a lock on the version (if any).
AF_ATTLTIME (time)
The date of last lock change. This is empty, when there was never a lock set.
AF_ATTMODE (numeric)
The version file type and protection. Same as st_mode in struct stat (see stat(2)).
AF_ATTMTIME (time)
The date of the last contents modification.
AF_ATTNAME (string)
The AtFS name of the version. This has the filename extension, if there is any,
stripped off.
AF_ATTOWNER (user)
The versions owner.
AF_ATTREV (numeric)
The revision number.
AF_ATTSIZE (numeric)
The file size. This may be independent of the real storage size, as most saved versions
are stored as deltas (see also AF_ATTDSIZE).
AF_ATTSPATH (string)
The UNIX pathname leading to the version. This may be different when accessing the
version from different hosts.
AF_ATTSTATE (numeric)
The version state. States are numbered 0 trough 5 from busy to frozen.
AF_ATTSTIME (time)
The save date. This date is not set for busy versions.
AF_ATTTYPE (string)
The filename extension (the string behind the rightmost period in the versions full
name). See af_misc(3) for details.
AF_ATTUNIXNAME (string)
The full UNIX name (without path).
AF_ATTUNIXPATH (string)
The full UNIX path.
AF_ATTVERSION (string)
The complete version number generation.revision .
SEE ALSO
stat(2), free(3), af_misc(3), af_retrieve(3)
DIAGNOSTICS
Upon error, -1 or a nil pointer (depending on the return type) is returned and af_errno is set to the
corresponding error number.
LIMITS
Although AtFS promises the storage of an arbitrary number of user defined attributes, the current
implementation limits their number to 255. af_setattr sets the corresponding error condition if the limit
is reached.
AtFS-1.71 Fri Jun 25 14:33:00 1993 af_attrs(3)