1SYSINFO(2)                 Linux Programmer's Manual                SYSINFO(2)
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NAME

6       sysinfo - return system information
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SYNOPSIS

9       #include <sys/sysinfo.h>
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11       int sysinfo(struct sysinfo *info);
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DESCRIPTION

14       sysinfo()  returns certain statistics on memory and swap usage, as well
15       as the load average.
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17       Until Linux 2.3.16, sysinfo() returned  information  in  the  following
18       structure:
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20           struct sysinfo {
21               long uptime;             /* Seconds since boot */
22               unsigned long loads[3];  /* 1, 5, and 15 minute load averages */
23               unsigned long totalram;  /* Total usable main memory size */
24               unsigned long freeram;   /* Available memory size */
25               unsigned long sharedram; /* Amount of shared memory */
26               unsigned long bufferram; /* Memory used by buffers */
27               unsigned long totalswap; /* Total swap space size */
28               unsigned long freeswap;  /* Swap space still available */
29               unsigned short procs;    /* Number of current processes */
30               char _f[22];             /* Pads structure to 64 bytes */
31           };
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33       In  the  above  structure,  the sizes of the memory and swap fields are
34       given in bytes.
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36       Since Linux 2.3.23 (i386) and  Linux  2.3.48  (all  architectures)  the
37       structure is:
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39           struct sysinfo {
40               long uptime;             /* Seconds since boot */
41               unsigned long loads[3];  /* 1, 5, and 15 minute load averages */
42               unsigned long totalram;  /* Total usable main memory size */
43               unsigned long freeram;   /* Available memory size */
44               unsigned long sharedram; /* Amount of shared memory */
45               unsigned long bufferram; /* Memory used by buffers */
46               unsigned long totalswap; /* Total swap space size */
47               unsigned long freeswap;  /* Swap space still available */
48               unsigned short procs;    /* Number of current processes */
49               unsigned long totalhigh; /* Total high memory size */
50               unsigned long freehigh;  /* Available high memory size */
51               unsigned int mem_unit;   /* Memory unit size in bytes */
52               char _f[20-2*sizeof(long)-sizeof(int)];
53                                        /* Padding to 64 bytes */
54           };
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56       In  the  above structure, sizes of the memory and swap fields are given
57       as multiples of mem_unit bytes.
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RETURN VALUE

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

64       EFAULT info is not a valid address.
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VERSIONS

67       sysinfo() first appeared in Linux 0.98.pl6.
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CONFORMING TO

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

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

78       proc(5)
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COLOPHON

81       This  page  is  part of release 5.07 of the Linux man-pages project.  A
82       description of the project, information about reporting bugs,  and  the
83       latest     version     of     this    page,    can    be    found    at
84       https://www.kernel.org/doc/man-pages/.
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88Linux                             2017-09-15                        SYSINFO(2)
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