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   sysinfo    ( 2 )

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Имя (Name)

sysinfo - return system information

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Синопсис (Synopsis)

#include <sys/sysinfo.h>

       int sysinfo(struct sysinfo *info);

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Описание (Description)

sysinfo() returns certain statistics on memory and swap usage, as
       well as the load average.

       Until Linux 2.3.16, sysinfo() returned 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 */
           };

       In the above structure, the sizes of the memory and swap fields
       are given in bytes.

       Since Linux 2.3.23 (i386) and Linux 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 to 64 bytes */
           };

       In the above structure, sizes of the memory and swap fields are
       given as multiples of mem_unit bytes.

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Возвращаемое значение (Return value)

On success, sysinfo() returns zero.  On error, -1 is returned,
       and errno is set to indicate the error.

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Ошибки (Error)

EFAULT info is not a valid address.

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Версии (Versions)

sysinfo() first appeared in Linux 0.98.pl6.

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Стандарты (Conforming to)

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

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Примечание (Note)

All of the information provided by this system call is also
       available via /proc/meminfo and /proc/loadavg.

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Смотри также (See also)

proc(5)

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