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SYSINFO(2) Linux Programmer’s Manual SYSINFO(2) 名前 sysinfo - システム全体の統計情報を返す。書式 #include int sysinfo(struct sysinfo *info); 説明 Linux 2.3.16 までは sysinfo() は以下の構造体に情報を入れて返す。 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 */ }; ここでバイト単位で与えられる。 Linux 2.3.23 (i386)、2.3.48 (全てのアーキテクチャ) からは構造体は 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 */ }; となり、大きさは mem_unit バイトの倍数で与えられる。 sysinfo() はシステム全体の統計を取得する簡単な方法を提供する。これは /dev/kmem を読むよりも移植性の高い方法である。返り値成功した場合はゼロが返される。エラーならば -1 が返され、 errno が適切に設定される。エラー EFAULT sysinfo 構造体へのポインターが不正である。準拠この関数は Linux 特有であり、移植を意図したプログラムでは使用してはいけない。 Linux カーネルは 0.98.pl6 から sysinfo() システムコールを持っている。 Linux の libc は 5.3.5 より、glibc では 1.90 より sysinfo() ルーチンを含んでいる。関連項目 proc(5) Linux 2007-11-15 SYSINFO(2)

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 3.22 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)

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