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serial port issue


Can someone tell the reason why the following code
fails, returning error 

Filed to reopen
open(): Resource temporarily unavailable

    ....
    while ( ( fd = open( "/dev/ttyS0", O_RDWR ) ) < 0
)
    {
        if ( errno != EINTR )
        {
            printf( "Filed to open\n" );
            perror( "open()" );
            exit( 1 );
        }
    }
    .....
    close( fd );
    

When I connect two PCs with serial line (rs232,
between /dev/ttyS0 and COM2(Win2k)), and run a java
application that opens a serial port connection at the
other end and just tries to read data from line.

Im using the following gcc version 
gcc version 2.96 20000731 (Red Hat Linux 7.0)




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