mirror of https://github.com/mkerrisk/man-pages
124 lines
4.3 KiB
Groff
124 lines
4.3 KiB
Groff
.\" Copyright (C) 2016, Michael Kerrisk <mtk.manpages@gmail.com>
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.\" Based on an earlier version of the page where a few pieces were
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.\" copyright (C) 1993 by Dan Miner (dminer@nyx.cs.du.edu) and subsequently
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.\" others (see old changelog below).
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.\" The structure definitions are taken more or less straight from the kernel
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.\" source files.
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\"
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.\" Modified Sat Jul 24 12:35:12 1993 by Rik Faith <faith@cs.unc.edu>
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.\" Modified Tue Oct 22 22:29:51 1996 by Eric S. Raymond <esr@thyrsus.com>
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.\" Modified Mon Aug 25 16:06:11 1997 by Nicolás Lichtmaier <nick@debian.org>
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.\"
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.TH SYSINFO 2 2016-07-17 "Linux" "Linux Programmer's Manual"
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.SH NAME
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sysinfo \- return system information
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.SH SYNOPSIS
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.B #include <sys/sysinfo.h>
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.sp
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.BI "int sysinfo(struct sysinfo *" info );
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.SH DESCRIPTION
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.BR sysinfo ()
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returns certain statistics on memory and swap usage,
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as well as the load average.
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Until Linux 2.3.16,
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.BR sysinfo ()
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returned information in the following structure:
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.nf
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.in +4n
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struct sysinfo {
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long uptime; /* Seconds since boot */
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unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
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unsigned long totalram; /* Total usable main memory size */
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unsigned long freeram; /* Available memory size */
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unsigned long sharedram; /* Amount of shared memory */
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unsigned long bufferram; /* Memory used by buffers */
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unsigned long totalswap; /* Total swap space size */
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unsigned long freeswap; /* Swap space still available */
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unsigned short procs; /* Number of current processes */
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char _f[22]; /* Pads structure to 64 bytes */
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};
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.in
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.fi
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.PP
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In the above structure, the sizes of the memory and swap fields
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are given in bytes.
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Since Linux 2.3.23 (i386) and Linux 2.3.48
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(all architectures) the structure is:
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.nf
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.in +4n
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struct sysinfo {
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long uptime; /* Seconds since boot */
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unsigned long loads[3]; /* 1, 5, and 15 minute load averages */
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unsigned long totalram; /* Total usable main memory size */
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unsigned long freeram; /* Available memory size */
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unsigned long sharedram; /* Amount of shared memory */
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unsigned long bufferram; /* Memory used by buffers */
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unsigned long totalswap; /* Total swap space size */
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unsigned long freeswap; /* Swap space still available */
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unsigned short procs; /* Number of current processes */
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unsigned long totalhigh; /* Total high memory size */
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unsigned long freehigh; /* Available high memory size */
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unsigned int mem_unit; /* Memory unit size in bytes */
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char _f[20\-2*sizeof(long)\-sizeof(int)];
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/* Padding to 64 bytes */
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};
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.in
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.fi
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.PP
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In the above structure,
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sizes of the memory and swap fields are given as multiples of
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.I mem_unit
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bytes.
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.SH RETURN VALUE
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On success,
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.BR sysinfo ()
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returns zero.
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On error, \-1 is returned, and
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.I errno
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is set to indicate the cause of the error.
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.SH ERRORS
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.TP
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.B EFAULT
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.IR info
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is not a valid address.
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.SH VERSIONS
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.BR sysinfo ()
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first appeared in Linux 0.98.pl6.
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.SH CONFORMING TO
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This function is Linux-specific, and should not be used in programs
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intended to be portable.
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.SH NOTES
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All of the information provided by this system call is also available via
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.IR /proc/meminfo
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and
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.IR /proc/loadavg .
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.SH SEE ALSO
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.BR proc (5)
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