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/* Copyright 2000-2005 The Apache Software Foundation or its licensors, as * applicable. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef APR_POLL_H #define APR_POLL_H /** * @file apr_poll.h * @brief APR Poll interface */ #include "apr.h" #include "apr_pools.h" #include "apr_errno.h" #include "apr_inherit.h" #include "apr_file_io.h" #include "apr_network_io.h" #if APR_HAVE_NETINET_IN_H #include <netinet/in.h> #endif #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ /** * @defgroup apr_poll Poll Routines * @ingroup APR * @{ */ /** * Poll options */ #define APR_POLLIN 0x001 /**< Can read without blocking */ #define APR_POLLPRI 0x002 /**< Priority data available */ #define APR_POLLOUT 0x004 /**< Can write without blocking */ #define APR_POLLERR 0x010 /**< Pending error */ #define APR_POLLHUP 0x020 /**< Hangup occurred */ #define APR_POLLNVAL 0x040 /**< Descriptior invalid */ /** * Pollset Flags */ #define APR_POLLSET_THREADSAFE 0x001 /**< Adding or Removing a Descriptor is thread safe */ /** Used in apr_pollfd_t to determine what the apr_descriptor is */ typedef enum { APR_NO_DESC, /**< nothing here */ APR_POLL_SOCKET, /**< descriptor refers to a socket */ APR_POLL_FILE, /**< descriptor refers to a file */ APR_POLL_LASTDESC /**< descriptor is the last one in the list */ } apr_datatype_e ; /** Union of either an APR file or socket. */ typedef union { apr_file_t *f; /**< file */ apr_socket_t *s; /**< socket */ } apr_descriptor; /** @see apr_pollfd_t */ typedef struct apr_pollfd_t apr_pollfd_t; /** Poll descriptor set. */ struct apr_pollfd_t { apr_pool_t *p; /**< associated pool */ apr_datatype_e desc_type; /**< descriptor type */ apr_int16_t reqevents; /**< requested events */ apr_int16_t rtnevents; /**< returned events */ apr_descriptor desc; /**< @see apr_descriptor */ void *client_data; /**< allows app to associate context */ }; /* General-purpose poll API for arbitrarily large numbers of * file descriptors */ /** Opaque structure used for pollset API */ typedef struct apr_pollset_t apr_pollset_t; /** * Setup a pollset object * @param pollset The pointer in which to return the newly created object * @param size The maximum number of descriptors that this pollset can hold * @param p The pool from which to allocate the pollset * @param flags Optional flags to modify the operation of the pollset. * * @remark If flags equals APR_POLLSET_THREADSAFE, then a pollset is * created on which it is safe to make concurrent calls to * apr_pollset_add(), apr_pollset_remove() and apr_pollset_poll() from * separate threads. This feature is only supported on some * platforms; the apr_pollset_create() call will fail with * APR_ENOTIMPL on platforms where it is not supported. */ APR_DECLARE(apr_status_t) apr_pollset_create(apr_pollset_t **pollset, apr_uint32_t size, apr_pool_t *p, apr_uint32_t flags); /** * Destroy a pollset object * @param pollset The pollset to destroy */ APR_DECLARE(apr_status_t) apr_pollset_destroy(apr_pollset_t *pollset); /** * Add a socket or file descriptor to a pollset * @param pollset The pollset to which to add the descriptor * @param descriptor The descriptor to add * @remark If you set client_data in the descriptor, that value * will be returned in the client_data field whenever this * descriptor is signalled in apr_pollset_poll(). * @remark If the pollset has been created with APR_POLLSET_THREADSAFE * and thread T1 is blocked in a call to apr_pollset_poll() for * this same pollset that is being modified via apr_pollset_add() * in thread T2, the currently executing apr_pollset_poll() call in * T1 will either: (1) automatically include the newly added descriptor * in the set of descriptors it is watching or (2) return immediately * with APR_EINTR. Option (1) is recommended, but option (2) is * allowed for implementations where option (1) is impossible * or impractical. */ APR_DECLARE(apr_status_t) apr_pollset_add(apr_pollset_t *pollset, const apr_pollfd_t *descriptor); /** * Remove a descriptor from a pollset * @param pollset The pollset from which to remove the descriptor * @param descriptor The descriptor to remove * @remark If the pollset has been created with APR_POLLSET_THREADSAFE * and thread T1 is blocked in a call to apr_pollset_poll() for * this same pollset that is being modified via apr_pollset_remove() * in thread T2, the currently executing apr_pollset_poll() call in * T1 will either: (1) automatically exclude the newly added descriptor * in the set of descriptors it is watching or (2) return immediately * with APR_EINTR. Option (1) is recommended, but option (2) is * allowed for implementations where option (1) is impossible * or impractical. */ APR_DECLARE(apr_status_t) apr_pollset_remove(apr_pollset_t *pollset, const apr_pollfd_t *descriptor); /** * Block for activity on the descriptor(s) in a pollset * @param pollset The pollset to use * @param timeout Timeout in microseconds * @param num Number of signalled descriptors (output parameter) * @param descriptors Array of signalled descriptors (output parameter) */ APR_DECLARE(apr_status_t) apr_pollset_poll(apr_pollset_t *pollset, apr_interval_time_t timeout, apr_int32_t *num, const apr_pollfd_t **descriptors); /** * Poll the sockets in the poll structure * @param aprset The poll structure we will be using. * @param numsock The number of sockets we are polling * @param nsds The number of sockets signalled. * @param timeout The amount of time in microseconds to wait. This is * a maximum, not a minimum. If a socket is signalled, we * will wake up before this time. A negative number means * wait until a socket is signalled. * @remark The number of sockets signalled is returned in the third argument. * This is a blocking call, and it will not return until either a * socket has been signalled, or the timeout has expired. */ APR_DECLARE(apr_status_t) apr_poll(apr_pollfd_t *aprset, apr_int32_t numsock, apr_int32_t *nsds, apr_interval_time_t timeout); /** @} */ #ifdef __cplusplus } #endif #endif /* ! APR_POLL_H */