On 07/30/2009 03:19 PM, leo mueller wrote:
>
> by doing a mmap() my program exits with -EINVAL and up to now i have
> no clue why... parametes should be right.
>
> do you have any idea?
>
maybe somethings wrong with your socket. mmap-ping a fd for example only works
if you open the fd O_RDWR, e.g.:
/** Open a file for writing.
* - Creating the file if it doesn't exist.
* - Truncating it to 0 size if it already exists. (not really needed)
*
* Note: "O_WRONLY" mode is not sufficient when mmap-ing.
**/
fd = open( FILEPATH, O_RDWR | O_CREAT | O_TRUNC, ( mode_t )0600 );
if ( fd == -1 )
{
perror( "Error opening file for writing" );
exit( EXIT_FAILURE );
}
/**
* Now the file is ready to be mmap-ped.
**/
map = mmap( 0, FILESIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0 );
if ( map == MAP_FAILED )
{
close( fd );
perror( "Error mmapping the file" );
exit( EXIT_FAILURE );
}
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