Date: Fri, 12 Jan 2001 12:54:34 +0100 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: "Soumen Biswas" <soumen.biswas@gte.net> Cc: hackers@FreeBSD.ORG Subject: Re: how to write custom init Message-ID: <14561.979300474@critter> In-Reply-To: Your message of "Fri, 12 Jan 2001 03:46:08 PST." <001201c07c8d$4276f8a0$1e813b3f@netscaler.com>
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You may want to check out sysinstalls initialization, it is used to
run as /sbin/init when you boot from installation media
Poul-Henning
In message <001201c07c8d$4276f8a0$1e813b3f@netscaler.com>, "Soumen Biswas" writ
es:
>Hi ,
>
>What are the points to be observed while writing custom init
>
>I am currently doing something like :
>/*
> 1. never exit
> 2. open fd 0,1 & 2
> 3. link statically */
>
>int main( int argc, char **argv )
>{
>int fd ;
>char cmd[128] = {0};
>
>fd = open( "/dev/console", O_RDWR );
>dup(fd);
>dup(fd);
>
> while( 1 ) {
> printf( "comm>" ); fflush( stdout );
> fgets( cmd, sizeof(cmd ), stdin );
>
> if( memcmp( "init", cmd , 4 ) == 0 )
> { close(0); close(1);close(2); execv("/init/sbin", argv ); }
>
> if( memcmp( "quit", cmd, 4) == 0 ) reboot( RB_AUTOBOOT );
> } /* while */
>
>/* should not reach here */
>return 0 ;
>}
>
>
>Am I missing something ?
>
>Thanx & Regards
>soumen
>
>
>
>
>
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>
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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