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GETRUSAGE
Section: Linux Programmer's Manual (2)
Updated: 2008-07-15
Index
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NAME
getrusage - get resource usage
SYNOPSIS
#include <sys/time.h>
#include <sys/resource.h>
int getrusage(int who, struct rusage *usage);
DESCRIPTION
getrusage()
returns resource usage measures for
who,
which can be one of the following:
- RUSAGE_SELF
-
Return resource usage statistics for the calling process,
which is the sum of resources used by all threads in the process.
- RUSAGE_CHILDREN
-
Return resource usage statistics for all children of the
calling process that have terminated and been waited for.
These statistics will include the resources used by grandchildren,
and further removed descendants,
if all of the intervening descendants waited on their terminated children.
- RUSAGE_THREAD (since Linux 2.6.26)
-
Return resource usage statistics for the calling thread.
The resource usages are returned in the structure pointed to by
usage,
which has the following form:
struct rusage {
struct timeval ru_utime; /* user time used */
struct timeval ru_stime; /* system time used */
long ru_maxrss; /* maximum resident set size */
long ru_ixrss; /* integral shared memory size */
long ru_idrss; /* integral unshared data size */
long ru_isrss; /* integral unshared stack size */
long ru_minflt; /* page reclaims */
long ru_majflt; /* page faults */
long ru_nswap; /* swaps */
long ru_inblock; /* block input operations */
long ru_oublock; /* block output operations */
long ru_msgsnd; /* messages sent */
long ru_msgrcv; /* messages received */
long ru_nsignals; /* signals received */
long ru_nvcsw; /* voluntary context switches */
long ru_nivcsw; /* involuntary context switches */
};
RETURN VALUE
On success, zero is returned.
On error, -1 is returned, and
errno
is set appropriately.
ERRORS
- EFAULT
-
usage
points outside the accessible address space.
- EINVAL
-
who
is invalid.
CONFORMING TO
SVr4, 4.3BSD.
POSIX.1-2001 specifies
getrusage(),
but only specifies the fields
ru_utime
and
ru_stime.
RUSAGE_THREAD
is Linux-specific.
NOTES
Including
<sys/time.h>
is not required these days, but increases portability.
(Indeed,
struct timeval
is defined in
<sys/time.h>.)
In Linux kernel versions before 2.6.9, if the disposition of
SIGCHLD
is set to
SIG_IGN
then the resource usages of child processes
are automatically included in the value returned by
RUSAGE_CHILDREN,
although POSIX.1-2001 explicitly prohibits this.
This non-conformance is rectified in Linux 2.6.9 and later.
The structure definition shown at the start of this page
was taken from 4.3BSD Reno.
Not all fields are meaningful under Linux.
In Linux 2.4 only the fields
ru_utime,
ru_stime,
ru_minflt,
and
ru_majflt
are maintained.
Since Linux 2.6,
ru_nvcsw
and
ru_nivcsw
are also maintained.
See also the description of
/proc/PID/stat
in
proc(5).
SEE ALSO
getrlimit(2),
times(2),
wait(2),
wait4(2)
COLOPHON
This page is part of release 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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