syscalls_107.html

Linux系统调用

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<TITLE>Syscall specifications of Linux - sysinfo</TITLE>
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<H2><A NAME="SEC107" HREF="syscalls_toc.html#SEC107" tppabs="http://personal.xfol.com/%7erezaie/syscall/syscalls_toc.html#SEC107">sysinfo</A></H2>
<P>
<H3>SYNOPSIS</H3>
<P>
<CODE>int sysinfo(struct sysinfo *<VAR>info</VAR>);</CODE>
 
<H3>PARAMETERS</H3>
<P>
<VAR>info</VAR>: [out] buffer where to store the info.
<P>
<H3>DESCRIPTION</H3>
<P>
Returns system information and statistics. (What a surprise!!!) The
<CODE>sysinfo</CODE> structure has the following layout:
<P>
<PRE>
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 */
};
</PRE>
<P>
<H3>RETURN VALUE</H3>
<P>
On success zero is returned. On error -1 is returned and <CODE>errno</CODE> is
set to <CODE>EFAULT</CODE>.
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