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NAME

       sysinfo - returns information on overall system statistics

SYNOPSIS

       #include <sys/sysinfo.h>

       int sysinfo(struct sysinfo *info);

DESCRIPTION

       Until  Linux  2.3.16,  sysinfo()  used  to  return  information  in the
       following 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.  For an  example  of  its
       use, see intro(2).

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)