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.\"
.\" Copyright (c) 1993 Michael Haardt (michael@moria.de),
.\" Fri Apr 2 11:32:09 MET DST 1993
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\"
.\" The GNU General Public License's references to "object code"
.\" and "executables" are to be interpreted as the output of any
.\" document formatting or typesetting system, including
.\" intermediate and printed output.
.\"
.\" This manual is distributed in the hope that it will be useful,
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
.\" GNU General Public License for more details.
.\"
.\" You should have received a copy of the GNU General Public
.\" License along with this manual; if not, write to the Free
.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
.\" USA.
.\"
.\" Tue Jul 6 12:42:46 MDT 1993 <dminer@nyx.cs.du.edu>
.\" Added "Calling Directly" and supporting paragraphs
.\"
.\" Modified Sat Jul 24 15:19:12 1993 by Rik Faith <faith@cs.unc.edu>
.\"
.\" Modified 21 Aug 1994 by Michael Chastain <mec@shell.portal.com>:
.\" Added explanation of arg stacking when 6 or more args.
.\"
.\" Modified 10 June 1995 by Andries Brouwer <aeb@cwi.nl>
.\"
.\" Japanese Version Copyright (c) 1997 KUNIMOTO Yasuhiro, all rights reserved.
.\" Translated 1997-06-27, KUNIMOTO Yasuhiro (hiro@kthree.co.jp)
.\" Modified 1997-07-05, Yoshiki Sugiura (yox@in.aix.or.jp)
.\" Modified 1997-07-06, Yoshiki Sugiura (yox@in.aix.or.jp)
.\" Modified 1999-03-21, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Updated 2000-01-03, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2004-05-23, Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2005-02-21, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Updated 2006-04-16, Akihiro MOTOKI, Catch up to LDP v2.28
.\"
.\"WORD: system call ƥॳ
.\"
.TH INTRO 2 1996-05-22 "Linux 1.2.13" "Linux Programmer's Manual"
.SH ̾
intro, _syscall \- ƥॳ
.SH
ξϤ Linux ΥƥॳҤƤ롣
Linux 2.0 Ǥ 164 ĤΥƥॳ뤬¸ߤ롣
syscall(2) ȤΤȡ
.SS "ľܸƤӽФ"
ۤȤɤξ硢ľܥƥॳƤӽФɬפϤʤ
ˤäƤɸ C 饤֥ŬڤʴؿƤʤȤ⤢롣
Τ褦ʾϡץޡϡ_syscall ޥ
.BR syscall ()
Τ줫ȤäơʬǥƥॳƤӽФʤФʤʤ
.BR syscall ()
ȤˡˤĤƤ
.BR syscall (2)
Ƥ롣
ΥڡǤ _syscall ޥˤĤ롣
ޤĤɤλȤߤȤ٤ˤĤƤҤ٤롣
.SS ""
.B #include <linux/unistd.h>
A _syscall macro
desired system call
.SS
ƥॳ˴ؤƤΥץȥפΤ뤳Ȥפ
롣θĿη֤ͤηΤʤФʤʤ
ºݤλѤˤäƤϡưפ˥ƥƤӽФ˼ 6 Ĥ
ޥѰդƤ롣ηϰʲ̤Ǥ:
.sp
.RS
.RI _syscall X ( type , name , type1 , arg1 , type2 , arg2 ,...)
.RS
.HP
\fIX\fP 0\(en5 ͤǡƥॳ뤬ɬפȤοǤ롣
.HP
\fItype\fP ϥƥॳ֤ͤηǤ롣
.HP
\fIname\fP ϥƥॳ̾Ǥ롣
.HP
\fItypeN\fP N ܤΰηǤ롣
.HP
\fIargN\fP N ܤΰ̾Ǥ롣
.RE
.RE
.sp
Υޥϡꤷ \fIname\fP Ȥ̾δؿ롣
٥եǤ _syscall() ޥƤǤȡ
\fIname\fP ǤΥƥॳƤ֤ȤǤ롣
.SH
.nf
.sp
#include <stdio.h>
#include <errno.h>
#include <linux/unistd.h> /* for _syscallX macros/related stuff */
#include <linux/kernel.h> /* for struct sysinfo */
_syscall1(int, sysinfo, struct sysinfo *, info);
/* ա nroff Υե뤫ľܥԡȤ
printf ʸ˴ޤޤƤ;ʬʥХåå
Ȥ˺ʤ褦 */
int main(void)
{
struct sysinfo s_info;
int error;
error = sysinfo(&s_info);
printf("code error = %d\\n", error);
printf("Uptime = %lds\\nLoad: 1 min %lu / 5 min %lu / 15 min %lu\\n"
"RAM: total %lu / free %lu / shared %lu\\n"
"Memory in buffers = %lu\\nSwap: total %lu / free %lu\\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);
}
.fi
.SS
.nf
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
.fi
.SH
_syscall() ޥϥץȥפʤ桼ϼʬ
ץȥפʤФʤʤ⤷ʤ
C++ 桼ξä˽פǤ롣
.sp
ƥॳΥ顼ɤΤߤޤΥ顼ɤΤߤ
֤ȤƤ櫓ǤϤʤ
Υƥॳ뤬ɤΤ褦ʥ顼ɤ֤ˤĤƳǧ
ˤϤΥɤɤɬפ롣
Ƥξ硢ɸΥ顼ɤ (㤨 \-\fBEPERM\fP Τ褦)
֤
_syscall() ޥϡΥƥॳ֤ \fIr\fP Ǥʤ硢
ͤΤޤ֤ξˤѿ
.I errno
\-\fIr\fP ꤷ \-1 ֤
ƥ顼ɤ˴ؤƤ
.BR errno (3)
ȡ
.sp
.RB ( mmap ()
ʤɤ) ĤΥƥॳ 5Ĥ¿ΰ᤹롣
äƥॳϥå˰ץå夷
ΰΤޤؤΥݥϤƽ롣
.sp
ƥॳ硢ΰηϤ (by-value)
(¤ΤΤ褦ʽŪʥǡξ) ݥϤ (by-pointer)
ǤʤФʤʤ
.sp
glibc ޤΤʤƥॳưΤ˹ޤˡ
.BR syscall (2)
ȤȤǤ롣ʤ顢λȤߤѤǤΤϡ
.BR syscall (2)
б libc (glibc ʤ) ȤäƤꡢ
إåե
.I <sys/syscall.h>
ɬפ SYS_foo ޤޤƤǤ롣
Ǥʤϡ_syscall ޥѤɬפ롣
ĤΥƥ㡢ä ia64Ǥ _syscall ޥ
ƤʤΤ褦ʥƥǤ
.BR syscall (2)
ȤʤФʤʤ
.SH
ΥΥƥॳ뤬 Unix μ̤ɸ൬ʤ
ɽˡʲάѤ롣
.BR standards (7)
ȡ
.SH ե
.I /usr/include/linux/unistd.h
.SH Ϣ
.BR syscall (2),
.BR errno (3),
.BR feature_test_macros (7)
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