Messages in this thread | | | From | Eli Barzilay <> | Date | Thu, 24 Jul 2003 01:28:10 -0400 | Subject | Repost: Bug with select? |
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[This is a second post, since I didn't get any replies the first time. It looks more like a bug now, which sounds strange for something that common...]
When I run the following program, and block the terminal's output (C-s), the `select' doesn't seem to have any effect, resulting in a 100% cpu usage (this is on a RH8, with 2.4.18). I wouldn't be surprised if I'm doing something stupid, but it does seem to work fine on Solaris.
Is there anything wrong with this, or is this some bug?
====================================================================== #include <unistd.h> #include <fcntl.h> int main() { int flags, fd, len; fd_set writefds; fd = 1; flags = fcntl(fd, F_GETFL, 0); fcntl(fd, F_SETFL, flags | O_NONBLOCK); while (1) { FD_ZERO(&writefds); FD_SET(fd, &writefds); len = select(fd + 1, NULL, &writefds, NULL, NULL); if (!FD_ISSET(fd,&writefds)) exit(0); len = write(fd, "hi\n", 3); } fcntl(fd, F_SETFL, flags); } ======================================================================
-- ((lambda (x) (x x)) (lambda (x) (x x))) Eli Barzilay: http://www.barzilay.org/ Maze is Life! - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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