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SYSINFO !!!SYSINFO NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS CONFORMING TO SEE ALSO ---- !!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 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) ----
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sysinfo(2)
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