| 1 | /** @file
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| 2 | * IPRT - Polling I/O Handles.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2010-2020 Oracle Corporation
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License (GPL) as published by the Free Software
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| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | *
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| 16 | * The contents of this file may alternatively be used under the terms
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| 17 | * of the Common Development and Distribution License Version 1.0
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| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 19 | * VirtualBox OSE distribution, in which case the provisions of the
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| 20 | * CDDL are applicable instead of those of the GPL.
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| 21 | *
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| 22 | * You may elect to license modified versions of this file under the
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| 23 | * terms and conditions of either the GPL or the CDDL or both.
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| 24 | */
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| 25 |
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| 26 | #ifndef IPRT_INCLUDED_poll_h
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| 27 | #define IPRT_INCLUDED_poll_h
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| 28 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 29 | # pragma once
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| 30 | #endif
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| 31 |
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| 32 | #include <iprt/cdefs.h>
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| 33 | #include <iprt/types.h>
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| 34 |
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| 35 | RT_C_DECLS_BEGIN
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| 36 |
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| 37 | /** @defgroup grp_rt_poll RTPoll - Polling I/O Handles
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| 38 | * @ingroup grp_rt
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| 39 | * @{
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| 40 | */
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| 41 |
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| 42 | /** @name Poll events
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| 43 | * @{ */
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| 44 | /** Readable without blocking. */
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| 45 | #define RTPOLL_EVT_READ RT_BIT_32(0)
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| 46 | /** Writable without blocking. */
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| 47 | #define RTPOLL_EVT_WRITE RT_BIT_32(1)
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| 48 | /** Error condition, hangup, exception or similar. */
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| 49 | #define RTPOLL_EVT_ERROR RT_BIT_32(2)
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| 50 | /** Mask of the valid bits. */
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| 51 | #define RTPOLL_EVT_VALID_MASK UINT32_C(0x00000007)
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| 52 | /** @} */
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| 53 |
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| 54 | /**
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| 55 | * Polls on the specified poll set until an event occurs on one of the handles
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| 56 | * or the timeout expires.
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| 57 | *
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| 58 | * @returns IPRT status code.
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| 59 | * @retval VINF_SUCCESS if an event occurred on a handle. Note that these
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| 60 | * @retval VERR_INVALID_HANDLE if @a hPollSet is invalid.
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| 61 | * @retval VERR_CONCURRENT_ACCESS if another thread is already accessing the set. The
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| 62 | * user is responsible for ensuring single threaded access.
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| 63 | * @retval VERR_TIMEOUT if @a cMillies ellapsed without any events.
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| 64 | * @retval VERR_DEADLOCK if @a cMillies is set to RT_INDEFINITE_WAIT and there
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| 65 | * are no valid handles in the set.
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| 66 | *
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| 67 | * @param hPollSet The set to poll on.
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| 68 | * @param cMillies Number of milliseconds to wait. Use
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| 69 | * RT_INDEFINITE_WAIT to wait for ever.
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| 70 | * @param pfEvents Where to return details about the events that
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| 71 | * occurred. Optional.
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| 72 | * @param pid Where to return the ID associated with the
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| 73 | * handle when calling RTPollSetAdd. Optional.
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| 74 | *
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| 75 | * @sa RTPollNoResume
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| 76 | *
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| 77 | * @remarks The caller is responsible for ensuring
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| 78 | */
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| 79 | RTDECL(int) RTPoll(RTPOLLSET hPollSet, RTMSINTERVAL cMillies, uint32_t *pfEvents, uint32_t *pid);
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| 80 |
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| 81 | /**
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| 82 | * Same as RTPoll except that it will return when interrupted.
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| 83 | *
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| 84 | * @returns IPRT status code.
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| 85 | * @retval VINF_SUCCESS if an event occurred on a handle. Note that these
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| 86 | * @retval VERR_INVALID_HANDLE if @a hPollSet is invalid.
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| 87 | * @retval VERR_CONCURRENT_ACCESS if another thread is already accessing the set. The
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| 88 | * user is responsible for ensuring single threaded access.
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| 89 | * @retval VERR_TIMEOUT if @a cMillies ellapsed without any events.
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| 90 | * @retval VERR_DEADLOCK if @a cMillies is set to RT_INDEFINITE_WAIT and there
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| 91 | * are no valid handles in the set.
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| 92 | * @retval VERR_INTERRUPTED if a signal or other asynchronous event interrupted
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| 93 | * the polling.
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| 94 | *
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| 95 | * @param hPollSet The set to poll on.
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| 96 | * @param cMillies Number of milliseconds to wait. Use
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| 97 | * RT_INDEFINITE_WAIT to wait for ever.
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| 98 | * @param pfEvents Where to return details about the events that
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| 99 | * occurred. Optional.
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| 100 | * @param pid Where to return the ID associated with the
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| 101 | * handle when calling RTPollSetAdd. Optional.
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| 102 | */
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| 103 | RTDECL(int) RTPollNoResume(RTPOLLSET hPollSet, RTMSINTERVAL cMillies, uint32_t *pfEvents, uint32_t *pid);
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| 104 |
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| 105 | /**
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| 106 | * Creates a poll set with no members.
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| 107 | *
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| 108 | * @returns IPRT status code.
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| 109 | * @param phPollSet Where to return the poll set handle.
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| 110 | */
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| 111 | RTDECL(int) RTPollSetCreate(PRTPOLLSET phPollSet);
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| 112 |
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| 113 | /**
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| 114 | * Destroys a poll set.
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| 115 | *
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| 116 | * @returns IPRT status code.
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| 117 | * @param hPollSet The poll set to destroy. NIL_POLLSET is quietly
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| 118 | * ignored (VINF_SUCCESS).
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| 119 | */
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| 120 | RTDECL(int) RTPollSetDestroy(RTPOLLSET hPollSet);
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| 121 |
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| 122 | /**
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| 123 | * Adds a generic handle to the poll set.
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| 124 | *
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| 125 | * If a handle is entered more than once, it is recommended to add the one with
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| 126 | * RTPOLL_EVT_ERROR first to ensure that you get the right ID back when an error
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| 127 | * actually occurs. On some hosts it is possible that polling for
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| 128 | * RTPOLL_EVT_READ on a socket may cause it to return error conditions because
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| 129 | * the two cannot so easily be distinguished.
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| 130 | *
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| 131 | * Also note that RTPOLL_EVT_ERROR may be returned by RTPoll even if not asked
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| 132 | * for.
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| 133 | *
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| 134 | * @returns IPRT status code
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| 135 | * @retval VERR_CONCURRENT_ACCESS if another thread is already accessing the set. The
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| 136 | * user is responsible for ensuring single threaded access.
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| 137 | * @retval VERR_POLL_HANDLE_NOT_POLLABLE if the specified handle is not
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| 138 | * pollable.
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| 139 | * @retval VERR_POLL_HANDLE_ID_EXISTS if the handle ID is already in use in the
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| 140 | * set.
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| 141 | *
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| 142 | * @param hPollSet The poll set to modify.
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| 143 | * @param pHandle The handle to add. NIL handles are quietly
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| 144 | * ignored.
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| 145 | * @param fEvents Which events to poll for.
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| 146 | * @param id The handle ID.
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| 147 | */
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| 148 | RTDECL(int) RTPollSetAdd(RTPOLLSET hPollSet, PCRTHANDLE pHandle, uint32_t fEvents, uint32_t id);
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| 149 |
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| 150 | /**
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| 151 | * Removes a generic handle from the poll set.
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| 152 | *
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| 153 | * @returns IPRT status code
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| 154 | * @retval VERR_INVALID_HANDLE if @a hPollSet not valid.
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| 155 | * @retval VERR_CONCURRENT_ACCESS if another thread is already accessing the set. The
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| 156 | * user is responsible for ensuring single threaded access.
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| 157 | * @retval VERR_POLL_HANDLE_ID_NOT_FOUND if @a id doesn't resolve to a valid
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| 158 | * handle.
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| 159 | *
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| 160 | * @param hPollSet The poll set to modify.
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| 161 | * @param id The handle ID of the handle that should be
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| 162 | * removed.
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| 163 | */
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| 164 | RTDECL(int) RTPollSetRemove(RTPOLLSET hPollSet, uint32_t id);
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| 165 |
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| 166 |
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| 167 | /**
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| 168 | * Query a handle in the poll set by it's ID.
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| 169 | *
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| 170 | * @returns IPRT status code
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| 171 | * @retval VINF_SUCCESS if the handle was found. @a *pHandle is set.
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| 172 | * @retval VERR_INVALID_HANDLE if @a hPollSet is invalid.
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| 173 | * @retval VERR_CONCURRENT_ACCESS if another thread is already accessing the set. The
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| 174 | * user is responsible for ensuring single threaded access.
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| 175 | * @retval VERR_POLL_HANDLE_ID_NOT_FOUND if there is no handle with that ID.
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| 176 | *
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| 177 | * @param hPollSet The poll set to query.
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| 178 | * @param id The ID of the handle.
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| 179 | * @param pHandle Where to return the handle details. Optional.
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| 180 | */
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| 181 | RTDECL(int) RTPollSetQueryHandle(RTPOLLSET hPollSet, uint32_t id, PRTHANDLE pHandle);
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| 182 |
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| 183 | /**
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| 184 | * Gets the number of handles in the set.
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| 185 | *
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| 186 | * @retval The handle count.
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| 187 | * @retval UINT32_MAX if @a hPollSet is invalid or there is concurrent access.
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| 188 | *
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| 189 | * @param hPollSet The poll set.
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| 190 | */
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| 191 | RTDECL(uint32_t) RTPollSetGetCount(RTPOLLSET hPollSet);
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| 192 |
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| 193 | /**
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| 194 | * Modifies the events to poll for for the given id.
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| 195 | *
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| 196 | * @returns IPRT status code.
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| 197 | * @retval VERR_INVALID_HANDLE if @a hPollSet not valid.
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| 198 | * @retval VERR_CONCURRENT_ACCESS if another thread is already accessing the set. The
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| 199 | * user is responsible for ensuring single threaded access.
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| 200 | * @retval VERR_POLL_HANDLE_ID_NOT_FOUND if @a id doesn't resolve to a valid
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| 201 | * handle.
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| 202 | *
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| 203 | * @param hPollSet The poll set to modify.
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| 204 | * @param id The handle ID to change the events for.
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| 205 | * @param fEvents Which events to poll for.
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| 206 | */
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| 207 | RTDECL(int) RTPollSetEventsChange(RTPOLLSET hPollSet, uint32_t id, uint32_t fEvents);
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| 208 |
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| 209 | /**
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| 210 | * Adds a pipe handle to the set.
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| 211 | *
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| 212 | * @returns See RTPollSetAdd.
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| 213 | *
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| 214 | * @param hPollSet The poll set.
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| 215 | * @param hPipe The pipe handle.
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| 216 | * @param fEvents Which events to poll for.
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| 217 | * @param id The handle ID.
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| 218 | *
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| 219 | * @todo Maybe we could figure out what to poll for depending on the kind of
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| 220 | * pipe we're dealing with.
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| 221 | */
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| 222 | DECLINLINE(int) RTPollSetAddPipe(RTPOLLSET hPollSet, RTPIPE hPipe, uint32_t fEvents, uint32_t id)
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| 223 | {
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| 224 | RTHANDLE Handle;
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| 225 | Handle.enmType = RTHANDLETYPE_PIPE;
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| 226 | Handle.u.uInt = 0;
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| 227 | Handle.u.hPipe = hPipe;
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| 228 | return RTPollSetAdd(hPollSet, &Handle, fEvents, id);
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| 229 | }
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| 230 |
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| 231 | /**
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| 232 | * Adds a socket handle to the set.
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| 233 | *
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| 234 | * @returns See RTPollSetAdd.
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| 235 | *
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| 236 | * @param hPollSet The poll set.
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| 237 | * @param hSocket The socket handle.
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| 238 | * @param fEvents Which events to poll for.
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| 239 | * @param id The handle ID.
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| 240 | */
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| 241 | DECLINLINE(int) RTPollSetAddSocket(RTPOLLSET hPollSet, RTSOCKET hSocket, uint32_t fEvents, uint32_t id)
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| 242 | {
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| 243 | RTHANDLE Handle;
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| 244 | Handle.enmType = RTHANDLETYPE_SOCKET;
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| 245 | Handle.u.uInt = 0;
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| 246 | Handle.u.hSocket = hSocket;
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| 247 | return RTPollSetAdd(hPollSet, &Handle, fEvents, id);
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| 248 | }
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| 249 |
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| 250 | /** @} */
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| 251 |
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| 252 | RT_C_DECLS_END
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| 253 |
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| 254 | #endif /* !IPRT_INCLUDED_poll_h */
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| 255 |
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