SYSINFO(2)		   Linux Programmers Manual		   SYSINFO(2)



NAME
       sysinfo - returns information on overall system statistics

SYNOPSIS
       #include 

       int sysinfo(struct sysinfo *info);

DESCRIPTION
       Until Linux 2.3.16, sysinfo() used to return information in the follow
       ing structure:

	   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 */
	   };

       and the sizes were given in bytes.

       Since Linux 2.3.23 (i386), 2.3.48 (all architectures) the structure is:

	   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 */
	   };

       and the sizes are given as multiples of mem_unit bytes.

       sysinfo()  provides  a simple way of getting overall system statistics.
       This is more portable than reading /dev/kmem.

RETURN VALUE
       On success, zero is returned.  On error, -1 is returned, and  errno  is
       set appropriately.

ERRORS
       EFAULT pointer to struct sysinfo is invalid

CONFORMING TO
       This  function  is  Linux-specific,  and should not be used in programs
       intended to be portable.

       The Linux kernel has a sysinfo() system	call  since  0.98.pl6.	 Linux
       libc  contains a sysinfo() routine since 5.3.5, and glibc has one since
       1.90.

SEE ALSO
       proc(5)

COLOPHON
       This page is part of release 3.05 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



Linux				  2007-11-15			    SYSINFO(2)