GETACCT(2)GETACCT(2)NAME
getacct, putacct, wracct - get, put, or write extended accounting data
SYNOPSIS
#include <sys/exacct.h>
size_t getacct(idtype_t idtype, id_t id, void *buf, size_t bufsize);
int putacct(idtype_t idtype, id_t id, void *buf, size_t bufsize, int flags);
int wracct(idtype_t idtype, id_t id, int flags);
DESCRIPTION
These functions provide access to the extended accounting facility.
The getacct() function returns extended accounting buffers from the
kernel for currently executing tasks and processes. The resulting data
buffer is a packed exacct object that can be unpacked using
ea_unpack_object() (see ea_pack_object(3EXACCT)) and subsequently
manipulated using the functions of the extended accounting library,
libexacct(3LIB).
The putacct() function provides privileged processes the ability to tag
accounting records with additional data specific to that process. For
instance, a queueing facility might want to record to which queue a
given task or process was submitted prior to running. The flags argu‐
ment determines whether the contents of buf should be treated as raw
data (EP_RAW) or as an embedded exacct structure (EP_EXACCT_OBJECT). In
the case of EP_EXACCT_OBJECT, buf must be a packed exacct object as
returned by ea_pack_object(3EXACCT). The use of an inappropriate flag
or the inclusion of corrupt exacct data will likely corrupt the enclos‐
ing exacct file.
The wracct() function requests the kernel to write, given its internal
state of resource usage, the appropriate data for the specified task or
process. The flags field determines whether a partial (EW_PARTIAL) or
interval record (EW_INTERVAL) is written.
These functions require root privilege, as they allow inquiry or
reporting relevant to system tasks and processes other than the invok‐
ing process. The putacct() and wracct() functions also cause the kernel
to write records to the system's extended accounting files.
RETURN VALUES
The getacct() function returns the number of bytes required to repre‐
sent the extended accounting record for the requested system task or
process. If bufsize exceeds the returned size, buf will contain a
valid accounting record buffer. If bufsize is less than the return
value, buf will contain the first bufsize bytes of the record. If buf‐
size is 0, getacct() returns only the number of bytes required to rep‐
resent the extended accounting record. In the event of failure, −1 is
returned and errno is set to indicate the error.
The putacct() and wracct() functions return 0 if the record was suc‐
cessfully written. Otherwise, −1 is returned and errno is set to indi‐
cate the error.
ERRORS
The getacct(), putacct(), and wracct() functions will fail if:
EINVAL
The idtype argument was not P_TASKID or P_PID.
ENOSPC
The file system containing the extended accounting file
is full. The wracct() or putacct() function will fail if
the record size would exceed the amount of space remain‐
ing on the file system.
ENOTACTIVE
The extended accounting facility for the requested
idtype_t is not active. Either putacct() attempted to
write a task record when the task accounting file was
unset, or getacct() attempted to retrieve accounting data
for a process when extended process accounting was inac‐
tive.
EPERM
The {PRIV_SYS_ACCT} privilege is not asserted in the
effective set of the calling process.
ERSCH
The id argument does not refer to a presently active sys‐
tem task ID or process ID.
The putacct() and wracct() functions will fail if:
EINVAL
The flags argument is neither EW_PARTIAL nor EW_INTERVAL.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌───────────────┬───────────────────┐
│ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├───────────────┼───────────────────┤
│MT-Level │ Async-Signal-Safe │
└───────────────┴───────────────────┘
SEE ALSOea_pack_object(3EXACCT), libexacct(3LIB)attributes(5)
Jan 20, 2003 GETACCT(2)
