Man Sysinfo en anglais
SYSINFO(2)                 Linux Programmer's 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)