Hi guys, On Sat, Sep 25, 2010 at 5:08 PM, Philip Downer wrote: > javad karabi wrote: >> >> I am very curious about this. >> Where exactly does the "hello" text go, before it is 'flushed' ? >> I am thinking that it gets put in some other buffer, then 'flushing' the >> buffer does something >> to the effect of memcpy the buffer to the framebuffer? > > stdout is buffered, the '\n' newline character means that fflush is called > on stdout and so the buffer is flushed. You can turn the buffer off using > "setbuf(stdout, NULL);" and the output will immediately be displayed. Actually, there are 3 buffering modes supported in userspace. 1 - unbuffered. Every character is flushed out immediately 2 - line buffered. Characters are not flushed until a newline is encountered 3 - fully buffererd. Characters are not flushed until the buffer is filled. In cases 2 or 3, if you perform an input operation, then any unbuffered characters will be flushed. Here's some documentation: <http://linux.die.net/man/3/setvbuf> -- Dave Hylands Shuswap, BC, Canada http://www.DaveHylands.com/ -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
