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.\" $OpenBSD: getrusage.2,v 1.17 2015/02/28 21:51:57 bentley Exp $
.\"
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.\"
.\" @(#)getrusage.2 8.1 (Berkeley) 6/4/93
.\"
.Dd $Mdocdate: February 28 2015 $
.Dt GETRUSAGE 2
.Os
.Sh NAME
.Nm getrusage
.Nd get information about resource utilization
.Sh SYNOPSIS
.In sys/resource.h
.Ft int
.Fn getrusage "int who" "struct rusage *rusage"
.Sh DESCRIPTION
.Fn getrusage
returns resource usage information for argument
.Fa who ,
which can be one of the following:
.Bl -tag -width RUSAGE_CHILDREN -offset indent
.It Dv RUSAGE_SELF
Resources used by the current process.
.It Dv RUSAGE_CHILDREN
Resources used by all the terminated children of the current process.
.It Dv RUSAGE_THREAD
Resources used by the current thread.
.El
.Pp
The buffer to which
.Fa rusage
points will be filled in with
the following structure:
.Bd -literal
struct rusage {
struct timeval ru_utime; /* user time used */
struct timeval ru_stime; /* system time used */
long ru_maxrss; /* max resident set size */
long ru_ixrss; /* integral shared text 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 */
};
.Ed
.Pp
The fields are interpreted as follows:
.Bl -tag -width ru_minfltaa
.It Fa ru_utime
the total amount of time spent executing in user mode.
.It Fa ru_stime
the total amount of time spent in the system executing on behalf
of the process(es).
.It Fa ru_maxrss
the maximum resident set size utilized (in kilobytes).
.It Fa ru_ixrss
an
.Dq integral
value indicating the amount of memory used
by the text segment
that was also shared among other processes.
This value is expressed in units of kilobytes * ticks-of-execution.
.It Fa ru_idrss
an integral value of the amount of unshared memory residing in the
data segment of a process (expressed in units of
kilobytes * ticks-of-execution).
.It Fa ru_isrss
an integral value of the amount of unshared memory residing in the
stack segment of a process (expressed in units of
kilobytes * ticks-of-execution).
.It Fa ru_minflt
the number of page faults serviced without any I/O activity; here
I/O activity is avoided by
.Dq reclaiming
a page frame from
the list of pages awaiting reallocation.
.It Fa ru_majflt
the number of page faults serviced that required I/O activity.
.It Fa ru_nswap
the number of times a process was
.Dq swapped
out of main memory.
.It Fa ru_inblock
the number of times the file system had to perform input.
.It Fa ru_oublock
the number of times the file system had to perform output.
.It Fa ru_msgsnd
the number of IPC messages sent.
.It Fa ru_msgrcv
the number of IPC messages received.
.It Fa ru_nsignals
the number of signals delivered.
.It Fa ru_nvcsw
the number of times a context switch resulted due to a process
voluntarily giving up the processor before its time slice was
completed (usually to await availability of a resource).
.It Fa ru_nivcsw
the number of times a context switch resulted due to a higher
priority process becoming runnable or because the current process
exceeded its time slice.
.El
.Sh NOTES
The numbers
.Fa ru_inblock
and
.Fa ru_oublock
account only for real
I/O; data supplied by the caching mechanism is charged only
to the first process to read or write the data.
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
.Fn getrusage
will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The
.Fa who
parameter is not a valid value.
.It Bq Er EFAULT
The address specified by the
.Fa rusage
parameter is not in a valid part of the process address space.
.El
.Sh SEE ALSO
.Xr clock_gettime 2 ,
.Xr gettimeofday 2 ,
.Xr wait 2
.Sh STANDARDS
The
.Fn getrusage
function conforms to
.St -p1003.1-2008 .
.Pp
The
.Dv RUSAGE_THREAD
flag is an extension to that specification.
.Sh HISTORY
A predecessor to
.Fn getrusage ,
.Fn times ,
first appeared in
.At v3 .
The
.Fn getrusage
system call first appeared in
.Bx 4.1c .
.Pp
The
.Dv RUSAGE_THREAD
flag has been available since
.Ox 4.8 .
.Sh BUGS
There is no way to obtain information about a child process
that has not yet terminated.
|
