Date: Tue, 23 Jan 1996 14:53:52 -0600 From: Jim Lowe <james@miller.cs.uwm.edu> To: terry@lambert.org Cc: dufault@hda.com, hackers@FreeBSD.org, hasty@rah.star-gate.com, jkh@time.cdrom.com, luigi@labinfo.iet.unipi.it, multimedia@rah.star-gate.com Subject: Re: Amancio's tv program with capture! Message-ID: <199601232053.OAA14413@miller.cs.uwm.edu>
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> > How does one mark the driver/mmapped memory as shared memory
> > with the current utilities? It isn't real obvious that one can
> > actually do this without modifiying the shmat system call (or at
> > least to me).
>
>
> int fd;
> caddr_t mapaddr;
>
> if( ( fd = open( DEV_NAME, O_RDWR)) == -1) {
> perror( "open");
> exit( 1);
> }
>
> mapaddr = mmap( 0, /* map here, 0 = don't care*/
> DEV_MEM_SIZE, /* device memory window*/
> PROT_READ|PROT_WRITE, /* will be reading/writing*/
> MAP_HASSEMAPHORE, /* (?) prevent caching*/
> fd, /* fd for device*/
> (off_t)0 /* full window*/
> );
>
I know how to mmap. The question is once you have mapaddr how does
one attach that to X's shared memory functions through the Xshm
utilities? I don't beleive I have ever head of map_hassemaphore...
-Jim
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