On Sun, Dec 28, 2003 at 04:15:16PM +0100, Simone Piccardi wrote:
> Package: libc6-dev
> Version: 2.3.2.ds1-10
> Severity: normal
>
> I'm writing an example program using poll. But after including sys/poll.h I
> still have a 'POLLRDNORM' undeclared error. To have it defined I must define
> __USE_XOPEN, but no mention of this in the man page.
The poll(2) man page on my system, from manpages-dev 1.62-1, reads as
follows (in part):
The
following possible bits in these masks are defined in
<sys/poll.h>
#define POLLIN 0x0001 /* There is data to read */
#define POLLPRI 0x0002 /* There is urgent data to read */
#define POLLOUT 0x0004 /* Writing now will not block */
#define POLLERR 0x0008 /* Error condition */
#define POLLHUP 0x0010 /* Hung up */
#define POLLNVAL 0x0020 /* Invalid request: fd not open */
When compiling XPG4.2 source one also has
#ifdef _XOPEN_SOURCE
#define POLLRDNORM 0x0040 /* Normal data may be read */
#define POLLRDBAND 0x0080 /* Priority data may be read */
#define POLLWRNORM 0x0100 /* Writing now will not block */
#define POLLWRBAND 0x0200 /* Priority data may be written */
#endif
Finally, Linux knows about
#ifdef _GNU_SOURCE
#define POLLMSG 0x0400
#endif
This definitely implies to me that you need to define _XOPEN_SOURCE
(__USE_XOPEN may have the same effect but it's supposed to be set by
<features.h>, not the user) in order to get this constant. See 'info
libc "Feature Test Macros"' for information on this kind of thing.
Cheers,
--
Colin Watson [EMAIL PROTECTED]
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