EA_SET_ITEM(3EXACCT) Extended Accounting File Access Library Functions


NAME


ea_set_item, ea_alloc, ea_strdup, ea_set_group, ea_match_object_catalog,
ea_attach_to_object, ea_attach_to_group, ea_free, ea_strfree,
ea_free_item, ea_free_object - create, destroy and manipulate exacct
objects

SYNOPSIS


cc [ flag... ] file... -lexacct [ library... ]
#include <exacct.h>

int ea_set_item(ea_object_t *obj, ea_catalog_t tag, void *value,
size_t valsize);


void *ea_alloc(size_t size);


char *ea_strdup(char *ptr);


int ea_set_group(ea_object_t *obj, ea_catalog_t tag);


int ea_match_object_catalog(ea_object_t *obj, ea_catalog_t catmask);


void ea_attach_to_object(ea_object_t *head_obj, ea_object_t *obj);


void ea_attach_to_group(ea_object_t *group_obj, ea_object_t *obj);


void ea_free(void *ptr, size_t size);


void ea_strfree(char *ptr);


int ea_free_item(ea_object_t *obj, int flag);


void ea_free_object(ea_object_t *obj, int flag);


DESCRIPTION


The ea_alloc() function allocates a block of memory of the requested
size. This block can be safely passed to libexacct functions, and can be
safely freed by any of the ea_free() functions.


The ea_strdup() function can be used to duplicate a string that is to be
stored inside an ea_object_t structure.


The ea_set_item() function assigns the given exacct object to be a data
item with value set according to the remaining arguments. For buffer-
based data values (EXT_STRING, EXT_EXACCT_OBJECT, and EXT_RAW), a copy of
the passed buffer is taken. In the case of EXT_EXACCT_OBJECT, the passed
buffer should be a packed exacct object as returned by
ea_pack_object(3EXACCT). Any item assigned with ea_set_item() should be
freed with ea_free_item() specifying a flag value of EUP_ALLOC when the
item is no longer needed.


The ea_match_object_catalog() function returns TRUE if the exacct object
specified by obj has a catalog tag that matches the mask specified by
catmask.


The ea_attach_to_object() function attaches an object to the given
object. The ea_attach_to_group() function attaches a chain of objects as
member items of the given group. Objects are inserted at the end of the
list of any previously attached objects.


The ea_free() function frees a block of memory previously allocated by
ea_alloc().


The ea_strfree() function frees a string previously copied by
ea_strdup().


The ea_free_item() function frees the value fields in the ea_object_t
indicated by obj, if EUP_ALLOC is specified. The object itself is not
freed. The ea_free_object() function frees the specified object and any
attached hierarchy of objects. If the flag argument is set to EUP_ALLOC,
ea_free_object() will also free any variable-length data in the object
hierarchy; if set to EUP_NOALLOC, ea_free_object() will not free
variable-length data. In particular, these flags should correspond to
those specified in calls to ea_unpack_object(3EXACCT).

RETURN VALUES


The ea_match_object_catalog() function returns 0 if the object's catalog
tag does not match the given mask, and 1 if there is a match.


Other integer-valued functions return 0 if successful. Otherwise these
functions return -1 and set the extended accounting error code
appropriately. Pointer-valued functions return a valid pointer if
successful and NULL otherwise, setting the extended accounting error code
appropriately. The extended accounting error code can be examined with
ea_error(3EXACCT).

ERRORS


The ea_set_item(), ea_set_group(), and ea_match_object_catalog()
functions may fail if:

EXR_SYSCALL_FAIL
A system call invoked by the function failed. The
errno variable contains the error value set by the
underlying call.


EXR_INVALID_OBJECT
The passed object is of an incorrect type, for
example passing a group object to ea_set_item().


USAGE


The exacct file format can be used to represent data other than that in
the extended accounting format. By using a unique creator type in the
file header, application writers can develop their own format suited to
the needs of their application.

EXAMPLES


Example 1: Open and close exacct file.




Construct an exacct file consisting of a single object containing the
current process ID.


#include <sys/types.h>
#include <unistd.h>
#include <exacct.h>

...

ea_file_t ef;
ea_object_t obj;
pid_t my_pid;

my_pid = getpid();
ea_set_item(&obj, EXT_UINT32 | EXC_DEFAULT | EXT_PROC_PID,
&my_pid, sizeof(my_pid));

...


ATTRIBUTES


See attributes(5) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Evolving |
+--------------------+-----------------+
|MT-Level | MT-Safe |
+--------------------+-----------------+

SEE ALSO


read(2), ea_error(3EXACCT), ea_open(3EXACCT), ea_pack_object(3EXACCT),
libexacct(3LIB), attributes(5)


November 28, 2001 EA_SET_ITEM(3EXACCT)