console_codes.4, inode.7: srcfix

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

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-.\" -*- nroff -*-
-.\"
-.\" (C)opyright 1993 by Dan Miner (dminer@nyx.cs.du.edu)
-.\"
-.\"  Permission is granted to freely distribute or modify this file
-.\"  for the purpose of improving Linux or its documentation efforts.
-.\"  If you modify this file, please put a date stamp and HOW you
-.\"  changed this file.  Thanks.   -DM
-.\"
-.\" 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 2007-11-15 "Linux" "Linux Programmer's Manual"
-.SH NAME
-sysinfo \- returns information on overall system statistics
-.SH SYNOPSIS
-.B #include <sys/sysinfo.h>
-.sp
-.BI "int sysinfo(struct sysinfo *" info );
-.SH DESCRIPTION
-Until Linux 2.3.16,
-.BR sysinfo ()
-used to return information in the following structure:
-
-.nf
-.in +4n
-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 */
-};
-.in
-.fi
-.PP
-and the sizes were given in bytes.
-
-Since Linux 2.3.23 (i386), 2.3.48
-(all architectures) the structure is:
-
-.nf
-.in +4n
-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 for libc5 */
-};
-.in
-.fi
-.PP
-and the sizes are given as multiples of \fImem_unit\fP bytes.
-
-.BR sysinfo ()
-provides a simple way of getting overall system statistics.
-This is more
-portable than reading \fI/dev/kmem\fP.
-.SH "RETURN VALUE"
-On success, zero is returned.
-On error, \-1 is returned, and
-.I errno
-is set appropriately.
-.SH ERRORS
-.TP
-.B EFAULT
-pointer to \fIstruct\ sysinfo\fP is invalid
-.SH "CONFORMING TO"
-This function is Linux specific, and should not be used in programs
-intended to be portable.
-.sp
-The Linux kernel has a
-.BR sysinfo ()
-system call since 0.98.pl6.
-Linux libc contains a
-.BR sysinfo ()
-routine since 5.3.5, and
-glibc has one since 1.90.
-.SH "SEE ALSO"
-.BR proc (5)