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linux/include/uapi/asm-generic/poll.h

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License cleanup: add SPDX license identifier to uapi header files with no license Many user space API headers are missing licensing information, which makes it hard for compliance tools to determine the correct license. By default are files without license information under the default license of the kernel, which is GPLV2. Marking them GPLV2 would exclude them from being included in non GPLV2 code, which is obviously not intended. The user space API headers fall under the syscall exception which is in the kernels COPYING file: NOTE! This copyright does *not* cover user programs that use kernel services by normal system calls - this is merely considered normal use of the kernel, and does *not* fall under the heading of "derived work". otherwise syscall usage would not be possible. Update the files which contain no license information with an SPDX license identifier. The chosen identifier is 'GPL-2.0 WITH Linux-syscall-note' which is the officially assigned identifier for the Linux syscall exception. SPDX license identifiers are a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. See the previous patch in this series for the methodology of how this patch was researched. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 22:08:43 +08:00
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
Consolidate asm/poll.h These files are almost all the same. This patch could be made even simpler if we don't mind POLLREMOVE turning up in a few architectures that didn't have it previously (which should be OK as POLLREMOVE is not used anywhere in the current tree). Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 13:22:40 +08:00
#ifndef __ASM_GENERIC_POLL_H
#define __ASM_GENERIC_POLL_H
/* These are specified by iBCS2 */
define __poll_t, annotate constants Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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#define POLLIN (__force __poll_t)0x0001
#define POLLPRI (__force __poll_t)0x0002
#define POLLOUT (__force __poll_t)0x0004
#define POLLERR (__force __poll_t)0x0008
#define POLLHUP (__force __poll_t)0x0010
#define POLLNVAL (__force __poll_t)0x0020
Consolidate asm/poll.h These files are almost all the same. This patch could be made even simpler if we don't mind POLLREMOVE turning up in a few architectures that didn't have it previously (which should be OK as POLLREMOVE is not used anywhere in the current tree). Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 13:22:40 +08:00
/* The rest seem to be more-or-less nonstandard. Check them! */
define __poll_t, annotate constants Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-07-03 10:05:03 +08:00
#define POLLRDNORM (__force __poll_t)0x0040
#define POLLRDBAND (__force __poll_t)0x0080
Consolidate asm/poll.h These files are almost all the same. This patch could be made even simpler if we don't mind POLLREMOVE turning up in a few architectures that didn't have it previously (which should be OK as POLLREMOVE is not used anywhere in the current tree). Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 13:22:40 +08:00
#ifndef POLLWRNORM
define __poll_t, annotate constants Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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#define POLLWRNORM (__force __poll_t)0x0100
Consolidate asm/poll.h These files are almost all the same. This patch could be made even simpler if we don't mind POLLREMOVE turning up in a few architectures that didn't have it previously (which should be OK as POLLREMOVE is not used anywhere in the current tree). Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 13:22:40 +08:00
#endif
#ifndef POLLWRBAND
define __poll_t, annotate constants Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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#define POLLWRBAND (__force __poll_t)0x0200
Consolidate asm/poll.h These files are almost all the same. This patch could be made even simpler if we don't mind POLLREMOVE turning up in a few architectures that didn't have it previously (which should be OK as POLLREMOVE is not used anywhere in the current tree). Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 13:22:40 +08:00
#endif
#ifndef POLLMSG
define __poll_t, annotate constants Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-07-03 10:05:03 +08:00
#define POLLMSG (__force __poll_t)0x0400
Consolidate asm/poll.h These files are almost all the same. This patch could be made even simpler if we don't mind POLLREMOVE turning up in a few architectures that didn't have it previously (which should be OK as POLLREMOVE is not used anywhere in the current tree). Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 13:22:40 +08:00
#endif
#ifndef POLLREMOVE
define __poll_t, annotate constants Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-07-03 10:05:03 +08:00
#define POLLREMOVE (__force __poll_t)0x1000
Consolidate asm/poll.h These files are almost all the same. This patch could be made even simpler if we don't mind POLLREMOVE turning up in a few architectures that didn't have it previously (which should be OK as POLLREMOVE is not used anywhere in the current tree). Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 13:22:40 +08:00
#endif
#ifndef POLLRDHUP
define __poll_t, annotate constants Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-07-03 10:05:03 +08:00
#define POLLRDHUP (__force __poll_t)0x2000
Consolidate asm/poll.h These files are almost all the same. This patch could be made even simpler if we don't mind POLLREMOVE turning up in a few architectures that didn't have it previously (which should be OK as POLLREMOVE is not used anywhere in the current tree). Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 13:22:40 +08:00
#endif
define __poll_t, annotate constants Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-07-03 10:05:03 +08:00
#define POLLFREE (__force __poll_t)0x4000 /* currently only for epoll */
epoll: introduce POLLFREE to flush ->signalfd_wqh before kfree() This patch is intentionally incomplete to simplify the review. It ignores ep_unregister_pollwait() which plays with the same wqh. See the next change. epoll assumes that the EPOLL_CTL_ADD'ed file controls everything f_op->poll() needs. In particular it assumes that the wait queue can't go away until eventpoll_release(). This is not true in case of signalfd, the task which does EPOLL_CTL_ADD uses its ->sighand which is not connected to the file. This patch adds the special event, POLLFREE, currently only for epoll. It expects that init_poll_funcptr()'ed hook should do the necessary cleanup. Perhaps it should be defined as EPOLLFREE in eventpoll. __cleanup_sighand() is changed to do wake_up_poll(POLLFREE) if ->signalfd_wqh is not empty, we add the new signalfd_cleanup() helper. ep_poll_callback(POLLFREE) simply does list_del_init(task_list). This make this poll entry inconsistent, but we don't care. If you share epoll fd which contains our sigfd with another process you should blame yourself. signalfd is "really special". I simply do not know how we can define the "right" semantics if it used with epoll. The main problem is, epoll calls signalfd_poll() once to establish the connection with the wait queue, after that signalfd_poll(NULL) returns the different/inconsistent results depending on who does EPOLL_CTL_MOD/signalfd_read/etc. IOW: apart from sigmask, signalfd has nothing to do with the file, it works with the current thread. In short: this patch is the hack which tries to fix the symptoms. It also assumes that nobody can take tasklist_lock under epoll locks, this seems to be true. Note: - we do not have wake_up_all_poll() but wake_up_poll() is fine, poll/epoll doesn't use WQ_FLAG_EXCLUSIVE. - signalfd_cleanup() uses POLLHUP along with POLLFREE, we need a couple of simple changes in eventpoll.c to make sure it can't be "lost". Reported-by: Maxime Bizon <mbizon@freebox.fr> Cc: <stable@kernel.org> Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-02-25 03:07:11 +08:00
define __poll_t, annotate constants Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-07-03 10:05:03 +08:00
#define POLL_BUSY_LOOP (__force __poll_t)0x8000
net: poll/select low latency socket support select/poll busy-poll support. Split sysctl value into two separate ones, one for read and one for poll. updated Documentation/sysctl/net.txt Add a new poll flag POLL_LL. When this flag is set, sock_poll will call sk_poll_ll if possible. sock_poll sets this flag in its return value to indicate to select/poll when a socket that can busy poll is found. When poll/select have nothing to report, call the low-level sock_poll again until we are out of time or we find something. Once the system call finds something, it stops setting POLL_LL, so it can return the result to the user ASAP. Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-06-24 15:28:03 +08:00
make kernel-side POLL... arch-independent mangle/demangle on the way to/from userland Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-11-30 08:00:41 +08:00
#ifdef __KERNEL__
#ifndef __ARCH_HAS_MANGLED_POLL
static inline __u16 mangle_poll(__poll_t val)
{
return (__force __u16)val;
}
static inline __poll_t demangle_poll(__u16 v)
{
return (__force __poll_t)v;
}
#endif
#endif
Consolidate asm/poll.h These files are almost all the same. This patch could be made even simpler if we don't mind POLLREMOVE turning up in a few architectures that didn't have it previously (which should be OK as POLLREMOVE is not used anywhere in the current tree). Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-11 13:22:40 +08:00
struct pollfd {
int fd;
short events;
short revents;
};
#endif /* __ASM_GENERIC_POLL_H */