fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
187 lines
6.0 KiB
Groff
187 lines
6.0 KiB
Groff
.\" Copyright (c) 1985, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)getrusage.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd May 1, 2010
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.Dt GETRUSAGE 2
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.Os
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.Sh NAME
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.Nm getrusage
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.Nd get information about resource utilization
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/time.h
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.In sys/resource.h
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.Fd "#define RUSAGE_SELF 0"
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.Fd "#define RUSAGE_CHILDREN -1"
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.Fd "#define RUSAGE_THREAD 1"
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.Ft int
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.Fn getrusage "int who" "struct rusage *rusage"
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.Sh DESCRIPTION
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The
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.Fn getrusage
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system call
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returns information describing the resources utilized by the current
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thread, the current process, or all its terminated child processes.
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The
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.Fa who
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argument is either
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.Dv RUSAGE_THREAD ,
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.Dv RUSAGE_SELF ,
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or
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.Dv RUSAGE_CHILDREN .
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The buffer to which
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.Fa rusage
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points will be filled in with
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the following structure:
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.Bd -literal
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struct rusage {
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struct timeval ru_utime; /* user time used */
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struct timeval ru_stime; /* system time used */
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long ru_maxrss; /* max resident set size */
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long ru_ixrss; /* integral shared text memory size */
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long ru_idrss; /* integral unshared data size */
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long ru_isrss; /* integral unshared stack size */
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long ru_minflt; /* page reclaims */
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long ru_majflt; /* page faults */
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long ru_nswap; /* swaps */
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long ru_inblock; /* block input operations */
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long ru_oublock; /* block output operations */
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long ru_msgsnd; /* messages sent */
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long ru_msgrcv; /* messages received */
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long ru_nsignals; /* signals received */
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long ru_nvcsw; /* voluntary context switches */
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long ru_nivcsw; /* involuntary context switches */
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};
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.Ed
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.Pp
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The fields are interpreted as follows:
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.Bl -tag -width ru_minfltaa
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.It Fa ru_utime
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the total amount of time spent executing in user mode.
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.It Fa ru_stime
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the total amount of time spent in the system executing on behalf
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of the process(es).
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.It Fa ru_maxrss
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the maximum resident set size utilized (in kilobytes).
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.It Fa ru_ixrss
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an
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.Dq integral
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value indicating the amount of memory used
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by the text segment
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that was also shared among other processes.
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This value is expressed
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in units of kilobytes * ticks-of-execution.
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Ticks are statistics clock ticks.
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The statistics clock has a frequency of
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.Fn sysconf _SC_CLK_TCK
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ticks per second.
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.It Fa ru_idrss
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an integral value of the amount of unshared memory residing in the
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data segment of a process (expressed in units of
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kilobytes * ticks-of-execution).
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.It Fa ru_isrss
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an integral value of the amount of unshared memory residing in the
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stack segment of a process (expressed in units of
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kilobytes * ticks-of-execution).
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.It Fa ru_minflt
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the number of page faults serviced without any I/O activity; here
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I/O activity is avoided by
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.Dq reclaiming
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a page frame from
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the list of pages awaiting reallocation.
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.It Fa ru_majflt
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the number of page faults serviced that required I/O activity.
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.It Fa ru_nswap
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the number of times a process was
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.Dq swapped
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out of main
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memory.
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.It Fa ru_inblock
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the number of times the file system had to perform input.
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.It Fa ru_oublock
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the number of times the file system had to perform output.
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.It Fa ru_msgsnd
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the number of IPC messages sent.
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.It Fa ru_msgrcv
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the number of IPC messages received.
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.It Fa ru_nsignals
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the number of signals delivered.
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.It Fa ru_nvcsw
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the number of times a context switch resulted due to a process
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voluntarily giving up the processor before its time slice was
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completed (usually to await availability of a resource).
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.It Fa ru_nivcsw
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the number of times a context switch resulted due to a higher
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priority process becoming runnable or because the current process
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exceeded its time slice.
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.El
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.Sh NOTES
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The numbers
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.Fa ru_inblock
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and
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.Fa ru_oublock
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account only for real
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I/O; data supplied by the caching mechanism is charged only
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to the first process to read or write the data.
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.Sh RETURN VALUES
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.Rv -std getrusage
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.Sh ERRORS
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The
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.Fn getrusage
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system call will fail if:
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.Bl -tag -width Er
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.It Bq Er EINVAL
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The
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.Fa who
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argument is not a valid value.
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.It Bq Er EFAULT
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The address specified by the
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.Fa rusage
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argument is not in a valid part of the process address space.
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.El
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.Sh SEE ALSO
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.Xr gettimeofday 2 ,
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.Xr wait 2 ,
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.Xr clocks 7
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.Sh HISTORY
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The
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.Fn getrusage
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system call appeared in
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.Bx 4.2 .
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The
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.Dv RUSAGE_THREAD
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facility first appeared in
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.Fx 8.1 .
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.Sh BUGS
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There is no way to obtain information about a child process
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that has not yet terminated.
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