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[thirdparty/man-pages.git] / man2 / sysinfo.2

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-.\" manual page may be incorrect or out-of-date.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