Extended Accounting API Functions
The extended accounting API contains functions that perform the following:
exacct System Calls
The following table lists the system calls that interact with the extended accounting
subsystem.
Table 3-1 Extended Accounting System Calls
Function |
Description |
|---|
putacct(2) |
Provides privileged processes with the ability to tag accounting records with additional data
that is specific to the process |
getacct(2) |
Enables privileged processes to request extended accounting
buffers from the kernel for currently executing tasks and processes |
wracct(2) |
Requests the kernel to
write resource usage data for a specified task or process |
Operations on the exacct File
These functions provide access to the exacct files:
Table 3-2 exacct File Functions
Operations on exacct Objects
These functions are used to access exacct objects:
Table 3-3 exacct Object Functions
Memory Management
The following table lists the functions associated with extended accounting memory management. The
function name is a link to its man page.
Table 3-4 Extended Accounting Memory Management Functions
Link to man page |
Description |
|---|
ea_pack_object(3EXACCT) |
Converts
an exacct object from unpacked (in-memory) representation to packed (in-file) representation. |
ea_unpack_object(3EXACCT) |
Converts an exacct
object from packed (in-file) representation to unpacked (in-memory) representation. |
ea_strdup(3EXACCT) |
Duplicates a string that is
to be stored inside an ea_object_t structure. |
ea_strfree(3EXACCT) |
Frees a string previously copied by
ea_strdup(). |
ea_alloc(3EXACCT) |
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. |
ea_free(3EXACCT) |
Frees a block of memory previously allocated by ea_alloc(). |
ea_free_object(3EXACCT) |
Frees
variable-length data in object hierarchy. |
ea_free_item(3EXACCT) |
Frees value fields of designated object, if EUP_ALLOC
is specified. The object is not freed. ea_free_object() frees the specified object
and any attached hierarchy of objects. If the flag argument is set to
EUP_ALLOC, ea_free_object() also frees any variable-length data in the object hierarchy. If the
flag argument is set to EUP_NOALLOC, ea_free_object() does not free the variable-length
data. In particular, these flags should correspond to the flags specified in calls
to ea_unpack_object(3EXACCT). |
ea_copy_object(3EXACCT) |
Copies an ea_object_t. If the source object is part of a
chain, only the current object is copied. If the source object is
a group, only the group object is copied without its list of
members. The group object eg_nobjs and eg_objs fields are set to 0 and NULL
respectively. Use ea_copy_tree() to copy recursively a group or a list of items. |
ea_copy_object_tree(3EXACCT) |
ea_copy_object_tree
recursively copies an ea_object_t. All elements in the eo_next list are copied. Any
group objects are recursively copied. The returned object can be completely freed with
ea_free_object(3EXACCT) by specifying the EUP_ALLOC flag. |
ea_get_object_tree() |
Reads in nobj top-level objects from
the file, returning the same data structure that would have originally been passed
to ea_write_object(). On encountering a group object,ea_get_object() reads only the group header part of
the group. ea_get_object_tree() reads the group and all its member items, recursing
into subrecords if necessary. The returned object data structure can be completely freed
with ea_free_object() by specifying the EUP_ALLOC flag. |
Miscellaneous Operations
These functions are associated with miscellaneous operations: