On some systems (reported by Jeremy Sequoia as occurring on Darwin), poll(2) and select(2) can spuriously return EAGAIN if they fail to allocate kernel-internal resources, rather than ENOMEM as Linux does. The spec allows this for poll(2): http://pubs.opengroup.org/onlinepubs/9699919799/functions/poll.html says poll may return EAGAIN if "The allocation of internal data structures failed but a subsequent request may succeed." The spec for select(2) at http://pubs.opengroup.org/onlinepubs/9699919799/functions/select.html doesn't specify EAGAIN, but apparently Darwin can return it in that case too. I'd suggest the following text for poll(2)'s NOTES section: Some other UNIX systems can return EAGAIN if they fail to allocate kernel-internal resources, rather than ENOMEM as Linux does. The Single Unix Specification allows this behavior for poll(2). Portable programs may wish to check for EAGAIN and loop, just as with EINTR. And the following text for select(2)'s NOTES section: Some other UNIX systems can return EAGAIN if they fail to allocate kernel-internal resources, rather than ENOMEM as Linux does. The Single Unix Specification allows this behavior for poll(2), but not for select(2); nonetheless, some systems do return EAGAIN from select(2). Portable programs may wish to check for EAGAIN and loop, just as with EINTR. - Josh Triplett -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
