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A _syscall macro

desired system call

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_syscallX(type,name,type1,arg1,type2,arg2,...)

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type ¤Ï¥·¥¹¥Æ¥à¥³¡¼¥ë¤ÎÊÖ¤êÃͤη¿¤Ç¤¢¤ë¡£

name ¤Ï¥·¥¹¥Æ¥à¥³¡¼¥ë¤Î̾Á°¤Ç¤¢¤ë¡£

typeN ¤Ï N ÈÖÌܤΰú¤­¿ô¤Î·¿¤Ç¤¢¤ë¡£

argN ¤Ï N ÈÖÌܤΰú¤­¿ô¤Î̾Á°¤Ç¤¢¤ë¡£

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#include <stdio.h>
#include <linux/unistd.h>       /* for _syscallX macros/related stuff */
#include <linux/kernel.h>       /* for struct sysinfo */

_syscall1(int, sysinfo, struct sysinfo *, info);

/* Ãí°Õ¡§ nroff ¤Î¥½¡¼¥¹¥Õ¥¡¥¤¥ë¤«¤éľÀÜ¥³¥Ô¡¼¤¹¤ë¤È¤­¤Ï 
printf ʸ¤Ë´Þ¤Þ¤ì¤Æ¤¤¤ë;ʬ¤Ê¥Ð¥Ã¥¯¥¹¥é¥Ã¥·¥å¤ò½üµî¤¹¤ë
¤³¤È¤ò˺¤ì¤Ê¤¤¤è¤¦¤Ë */

int main(void)
{
        struct sysinfo s_info;
        int error;

        error = sysinfo(&s_info);
        printf("code error = %d\n", error);
        printf("Uptime = %ds\nLoad: 1 min %d / 5 min %d / 15 min %d\n"
                "RAM: total %d / free %d / shared %d\n"
                "Memory in buffers = %d\nSwap: total %d / free %d\n"
                "Number of processes = %d\n",
                s_info.uptime, s_info.loads[0],
                s_info.loads[1], s_info.loads[2],
                s_info.totalram, s_info.freeram,
                s_info.sharedram, s_info.bufferram,
                s_info.totalswap, s_info.freeswap,
                s_info.procs);
        return(0);
}

½ÐÎÏÎã

code error = 0
uptime = 502034s
Load: 1 min 13376 / 5 min 5504 / 15 min 1152
RAM: total 15343616 / free 827392 / shared 8237056
Memory in buffers = 5066752
Swap: total 27881472 / free 24698880
Number of processes = 40

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½àµò

SVr4

"Programmer's Reference Manual: Operating System API (Intel processors)" (Prentice-Hall1992, ISBN 0-13-951294-2) ¤Ë µ­½Ò¤µ¤ì¤Æ¤¤¤ë System V Release 4 Unix¡£

SVID

System V Interface Definition¡£¤³¤ì¤Ï "The System V Interface Definition, Fourth Edition" ¤Ë µ­½Ò¤µ¤ì¤Æ¤¤¤ë¡£

POSIX.1

IEEE 1003.1-1990 part 1¡£ÊÌ̾ ISO/IEC 9945-1:1990s¡£ Donald Lewine ¤Î "POSIX Programmer's Guide" (O'Reilly & Associates,Inc., 1991, ISBN 0-937175-73-0)¤Ëµ­½Ò¤µ¤ì¤Æ¤¤¤ë "IEEE Portable Operating System Interface for Computing Environments" ¤Ë¤â²òÀ⤬¤¢¤ë¡£

POSIX.1b

IEEE Std 1003.1b-1993 (POSIX.1b standard) ¤Î°Ü¿¢²Äǽ¤Ê¥ª¥Ú¥ì¡¼¥Æ¥£¥ó¥° ¥·¥¹¥Æ¥à¤Î¤¿¤á¤Î¥ê¥¢¥ë¥¿¥¤¥àµ¡¹½¡£ÊÌ̾ ISO/IEC 9945-1:1996¡£ Bill O. Gallmeister ¤Î "Programming for the real world - POSIX.4" (O'Reilly & Associates, Inc. ISBN1-56592-074-0) ¤Ë¤â²òÀ⤬¤¢¤ë¡£

SUS, SUSv2

Single Unix Specification. (X/Open ¤È The Open Group ¤Ë¤è¤Ã¤ÆºîÀ®¤µ¤ì¤¿¡£ http://www.UNIX-systems.org/version2/ ¤â»²¾È¤Î¤³¤È¡£)

4.3BSD/4.4BSD

Berkeley Unix 4.3 ¤È 4.4 ¥Ç¥£¥¹¥È¥ê¥Ó¥å¡¼¥·¥ç¥ó¡£ 4.4BSD ¤Ï 4.3 ¤ËÂФ·¤Æ¾å°Ì¸ß´¹¤Ç¤¢¤ë¡£

V7

¥Ù¥ë¸¦µæ½ê¤ËͳÍ褹¤ë¸µÁÄ Unix¤Ç¤¢¤ë Version 7¡£

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