Date: Sun, 8 Feb 2004 21:25:21 +0800 From: "airsupply" <airsupply@freebsdchina.org> To: freebsd-hackers@freebsd.org <freebsd-hackers@freebsd.org> Subject: Re: shmat help Message-ID: <20040208132622.3325543D1F@mx1.FreeBSD.org>
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airsupply,=C4=FA=BA=C3=A3=A1
=09oh,i have get it. it's code error.
=3D=3D=3D=3D=3D=3D=3D 2004-02-07 23:37:00 =C4=FA=D4=DA=C0=B4=D0=C5=D6=D0=D0=B4=B5=C0=A3=BA=3D=3D=3D=3D=3D=3D=3D
>freebsd-hackers=A3=AC=C4=FA=BA=C3=A3=A1
>
>=09
>i am test shmat under freebsd 4.8 release(without undate),but a=
piece of simple code wont work.
>code like this:
>#include<stdio.h>
>#include<machine/param.h>
>#include<sys/types.h>
>#include<sys/ipc.h>
>#include<sys/shm.h>
>#include <unistd.h>
>
>#define SHM_KEY 100
>#define SHM_SIZE 1024
>int main(int argc,char *argv[])
>{
> int shmid;
> void *shmaddr1,*shmaddr2,*shmaddr3;
> if(shmid=3Dshmget(SHM_KEY,SHM_SIZE,IPC_CREAT|0660)=3D=3D-1)
> {
> perror("shmget");
> exit(-1);
> }
>
> printf("shmid: d\n",shmid);
> if(shmaddr1=3Dshmat(shmid,0,0)=3D=3D-1)
> {
> perror("shmat 1");
> exit(-1);
> }
> printf("shaddr1:0x.8x\n",shmaddr1);
>
> if(shmaddr2=3Dshmat(shmid,0,0)=3D=3D-1)
> {
> perror("shmat 2");
> exit(-1);
> }
> printf("shaddr2:0x.8x\n",shmaddr2);
> while(1);
> return 0;
>}
>
>then i get error like this:
>
>shmid: 0
>shmat 1: Invalid argument
>then i use ipcs,find that the shmid is not 0,but an integer=
number.
>-bash-2.05b$ ipcs
>Message Queues:
>T ID KEY MODE OWNER GROUP
>
>Shared Memory:
>T ID KEY MODE OWNER GROUP
>m 65536 100 --rw-rw-rw- airs wheel
>
>Semaphores:
>T ID KEY MODE OWNER GROUP
>
>
>
>who can help me? who i can't use the shmid at shmat(shmid,0,0) ?=
>
>
>=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=D6=C2
>=C0=F1=A3=A1
> =09=09=09=09
>
>=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1airsupply
>=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1airsupply@freebsdchina.org
>=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A12004-02-07
>
>
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=3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D =3D
=09=09=09
=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=D6=C2
=C0=F1=A3=A1
=09=09=09=09
=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1airsupply
=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1airsupply@freebsdchina.org
=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A1=A12004-02-08
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