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Diffstat (limited to 'include/iprt/pipe.h')
| -rw-r--r-- | include/iprt/pipe.h | 293 |
1 files changed, 293 insertions, 0 deletions
diff --git a/include/iprt/pipe.h b/include/iprt/pipe.h new file mode 100644 index 00000000..a47f2d58 --- /dev/null +++ b/include/iprt/pipe.h @@ -0,0 +1,293 @@ +/** @file + * IPRT - Anonymous Pipes. + */ + +/* + * Copyright (C) 2010-2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox 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. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + +#ifndef IPRT_INCLUDED_pipe_h +#define IPRT_INCLUDED_pipe_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/cdefs.h> +#include <iprt/types.h> +#include <iprt/fs.h> + +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 */ + |