/** @file * IPRT - Anonymous Pipes. */ /* * Copyright (C) 2010-2022 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE distribution, in which case the provisions of the * CDDL are applicable instead of those of the GPL. * * You may elect to license modified versions of this file under the * terms and conditions of either the GPL or the CDDL or both. */ #ifndef IPRT_INCLUDED_pipe_h #define IPRT_INCLUDED_pipe_h #ifndef RT_WITHOUT_PRAGMA_ONCE # pragma once #endif #include #include #include RT_C_DECLS_BEGIN /** @defgroup grp_rt_pipe RTPipe - Anonymous Pipes * @ingroup grp_rt * * @note The current Windows implementation has some peculiarities, * especially with respect to the write side where the it is possible * to write one extra pipe buffer sized block of data when the pipe * buffer is full. * * @{ */ /** * Create an anonymous pipe. * * @returns IPRT status code. * @param phPipeRead Where to return the read end of the pipe. * @param phPipeWrite Where to return the write end of the pipe. * @param fFlags A combination of RTPIPE_C_XXX defines. */ RTDECL(int) RTPipeCreate(PRTPIPE phPipeRead, PRTPIPE phPipeWrite, uint32_t fFlags); /** @name RTPipeCreate flags. * @{ */ /** Mark the read end as inheritable. */ #define RTPIPE_C_INHERIT_READ RT_BIT(0) /** Mark the write end as inheritable. */ #define RTPIPE_C_INHERIT_WRITE RT_BIT(1) /** Mask of valid flags. */ #define RTPIPE_C_VALID_MASK UINT32_C(0x00000003) /** @} */ /** * Closes one end of a pipe created by RTPipeCreate. * * @returns IPRT status code. * @param hPipe The pipe end to close. */ RTDECL(int) RTPipeClose(RTPIPE hPipe); /** * Closes one end of a pipe created by RTPipeCreate, extended version. * * @returns IPRT status code. * @param hPipe The pipe end to close. * @param fLeaveOpen Wheter to leave the underlying native handle open * (for RTPipeClose() this is @c false). */ RTDECL(int) RTPipeCloseEx(RTPIPE hPipe, bool fLeaveOpen); /** * Creates an IPRT pipe handle from a native one. * * Do NOT use the native handle after passing it to this function, IPRT owns it * and might even have closed in some cases (in order to gain some query * information access on Windows). * * @returns IPRT status code. * @param phPipe Where to return the pipe handle. * @param hNativePipe The native pipe handle. * @param fFlags Pipe flags, RTPIPE_N_XXX. */ RTDECL(int) RTPipeFromNative(PRTPIPE phPipe, RTHCINTPTR hNativePipe, uint32_t fFlags); /** @name RTPipeFromNative flags. * @{ */ /** The read end. */ #define RTPIPE_N_READ RT_BIT(0) /** The write end. */ #define RTPIPE_N_WRITE RT_BIT(1) /** Make sure the pipe is inheritable if set and not inheritable when clear. */ #define RTPIPE_N_INHERIT RT_BIT(2) /** Mask of valid flags for . */ #define RTPIPE_N_VALID_MASK UINT32_C(0x00000007) /** RTPipeFromNative: Leave the native pipe handle open on close. */ #define RTPIPE_N_LEAVE_OPEN RT_BIT(3) /** Mask of valid flags for RTPipeFromNative(). */ #define RTPIPE_N_VALID_MASK_FN UINT32_C(0x0000000f) /** @} */ /** * Gets the native handle for an IPRT pipe handle. * * This is mainly for passing a pipe to a child and then closing the parent * handle. IPRT also uses it internally to implement RTProcCreatEx and * RTPollSetAdd on some platforms. Do NOT expect sane API behavior if used * for any other purpose. * * @returns The native handle. -1 on failure. * @param hPipe The IPRT pipe handle. */ RTDECL(RTHCINTPTR) RTPipeToNative(RTPIPE hPipe); /** * Get the creation inheritability of the pipe. * * @returns true if inherited by children (when pipe was created), false if not. * @param hPipe The IPRT pipe handle. */ RTDECL(int) RTPipeGetCreationInheritability(RTPIPE hPipe); /** * Read bytes from a pipe, non-blocking. * * @returns IPRT status code. * @retval VERR_WRONG_ORDER if racing a call to RTPipeReadBlocking. * @retval VERR_BROKEN_PIPE if the remote party has disconnected and we've read * all the buffered data. * @retval VINF_TRY_AGAIN if no data was available. @a *pcbRead will be set to * 0. * @retval VERR_ACCESS_DENIED if it's a write pipe. * * @param hPipe The IPRT pipe handle to read from. * @param pvBuf Where to put the bytes we read. * @param cbToRead How much to read. Must be greater than 0. * @param pcbRead Where to return the number of bytes that has been * read (mandatory). This is 0 if there is no more * bytes to read. * @sa RTPipeReadBlocking. */ RTDECL(int) RTPipeRead(RTPIPE hPipe, void *pvBuf, size_t cbToRead, size_t *pcbRead); /** * Read bytes from a pipe, blocking. * * @returns IPRT status code. * @retval VERR_WRONG_ORDER if racing a call to RTPipeRead. * @retval VERR_BROKEN_PIPE if the remote party has disconnected and we've read * all the buffered data. * @retval VERR_ACCESS_DENIED if it's a write pipe. * * @param hPipe The IPRT pipe handle to read from. * @param pvBuf Where to put the bytes we read. * @param cbToRead How much to read. * @param pcbRead Where to return the number of bytes that has been * read. Optional. */ RTDECL(int) RTPipeReadBlocking(RTPIPE hPipe, void *pvBuf, size_t cbToRead, size_t *pcbRead); /** * Write bytes to a pipe, non-blocking. * * @returns IPRT status code. * @retval VERR_WRONG_ORDER if racing a call to RTPipeWriteBlocking. * @retval VERR_BROKEN_PIPE if the remote party has disconnected. Does not * trigger when @a cbToWrite is 0. * @retval VINF_TRY_AGAIN if no data was written. @a *pcbWritten will be set * to 0. * @retval VERR_ACCESS_DENIED if it's a read pipe. * * @param hPipe The IPRT pipe handle to write to. * @param pvBuf What to write. * @param cbToWrite How much to write. * @param pcbWritten How many bytes we wrote, mandatory. The return can * be 0. */ RTDECL(int) RTPipeWrite(RTPIPE hPipe, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten); /** * Write bytes to a pipe, blocking. * * @returns IPRT status code. * @retval VERR_WRONG_ORDER if racing a call to RTPipeWrite. * @retval VERR_BROKEN_PIPE if the remote party has disconnected. Does not * trigger when @a cbToWrite is 0. * @retval VERR_ACCESS_DENIED if it's a read pipe. * * @param hPipe The IPRT pipe handle to write to. * @param pvBuf What to write. * @param cbToWrite How much to write. * @param pcbWritten How many bytes we wrote, optional. If NULL then all * bytes will be written. */ RTDECL(int) RTPipeWriteBlocking(RTPIPE hPipe, const void *pvBuf, size_t cbToWrite, size_t *pcbWritten); /** * Flushes the buffers for the specified pipe and making sure the other party * reads them. * * @returns IPRT status code. * @retval VERR_NOT_SUPPORTED if not supported by the OS. * @retval VERR_BROKEN_PIPE if the remote party has disconnected. * @retval VERR_ACCESS_DENIED if it's a read pipe. * * @param hPipe The IPRT pipe handle to flush. */ RTDECL(int) RTPipeFlush(RTPIPE hPipe); /** * Checks if the pipe is ready for reading or writing (depending on the pipe * end). * * @returns IPRT status code. * @retval VERR_TIMEOUT if the timeout was reached before the pipe was ready * for reading/writing. * @retval VERR_NOT_SUPPORTED if not supported by the OS? * * @param hPipe The IPRT pipe handle to select on. * @param cMillies Number of milliseconds to wait. Use * RT_INDEFINITE_WAIT to wait for ever. */ RTDECL(int) RTPipeSelectOne(RTPIPE hPipe, RTMSINTERVAL cMillies); /** * Queries the number of bytes immediately available for reading. * * @returns IPRT status code. * @retval VERR_NOT_SUPPORTED if not supported by the OS. The caller shall * handle this case. * * @param hPipe The IPRT read pipe handle. * @param pcbReadable Where to return the number of bytes that is ready * to be read. */ RTDECL(int) RTPipeQueryReadable(RTPIPE hPipe, size_t *pcbReadable); /** * Query information about a pipe (mainly a VFS I/O stream formality). * * The only thing we guarentee to be returned is RTFSOBJINFO::Attr.fMode being * set to FIFO and will reflect the read/write end in the RTFS_DOS_READONLY, * RTFS_UNIX_IRUSR and RTFS_UNIX_IWUSR bits. * * Some implementations sometimes provide the pipe buffer size via * RTFSOBJINFO::cbAllocated. * * Some implementations sometimes provide the available read data or available * write space via RTFSOBJINFO::cbObject. * * Some implementations sometimes provide valid device and/or inode numbers. * * @returns iprt status code. * * @param hPipe The IPRT read pipe handle. * @param pObjInfo Object information structure to be filled on successful * return. * @param enmAddAttr Which set of additional attributes to request. Use * RTFSOBJATTRADD_NOTHING if this doesn't matter. */ RTDECL(int) RTPipeQueryInfo(RTPIPE hPipe, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr); /** @} */ RT_C_DECLS_END #endif /* !IPRT_INCLUDED_pipe_h */