Date: Thu, 14 Feb 2002 21:49:55 -0500 From: "Jason Mawdsley" <jason@macadamian.com> To: <freebsd-hackers@FreeBSD.ORG> Subject: mmap and PROT_WRITE Message-ID: <05e201c1b5cb$73a00520$2a64a8c0@macadamian.com>
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{
void * p = mmap( 0, 1024, PROT_WRITE, MAP_ANON, -1, 0 );
if ( p )
{
/*
* pukes and dies
* *((int*)(p)) = 5;
*/
}
}
{
void * p = mmap( 0, 1024, PROT_WRITE | PROT_READ, MAP_ANON, -1, 0 );
if ( p )
{
*((int*)(p)) = 5;
}
}
Why can't I write to memory in the first case?
Is there anyway I can implement writable but no readable memory?
I read some where that there is no true write only memory do to the
limitations of x86.
TIA
Jason Mawdsley ~ jason@macadamian.com
Software Designer ~ m_ a c a d a m i a n t e c h n o l o g i e s
"Software experts for the world's leading technology companies."
http://www.macadamian.com
Because software development cycles should not end in tragedy.
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