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Diffstat (limited to '')
| -rw-r--r-- | include/iprt/symlink.h | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/include/iprt/symlink.h b/include/iprt/symlink.h new file mode 100644 index 00000000..8b5e60f0 --- /dev/null +++ b/include/iprt/symlink.h @@ -0,0 +1,189 @@ +/** @file + * IPRT - Symbolic Link Manipulation. + */ + +/* + * 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_symlink_h +#define IPRT_INCLUDED_symlink_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <iprt/cdefs.h> +#include <iprt/types.h> + + + +RT_C_DECLS_BEGIN + +/** @defgroup grp_rt_symlink RTSymlink - Symbolic Link Manipulation + * @ingroup grp_rt + * + * For querying and changing symlink info (mode, ownership, etc) please refer + * to the @ref grp_rt_path "RTPath" API: RTPathQueryInfoEx, RTPathSetOwnerEx, + * RTPathSetModeEx and RTPathSetTimesEx. + * + * @{ + */ + +/** + * Checks if the specified path exists and is a symlink. + * + * @returns true if it's a symlink, false if it isn't. + * @param pszSymlink The path to the symlink. + * + * @sa RTDirExists, RTPathExists, RTSymlinkExists. + */ +RTDECL(bool) RTSymlinkExists(const char *pszSymlink); + +/** + * Checks if this is a dangling link or not. + * + * If the target of @a pszSymlink is a symbolic link, this may return false if + * that or any subsequent links are dangling. + * + * @returns true if it's dangling, false if it isn't. + * @param pszSymlink The path to the symlink. + */ +RTDECL(bool) RTSymlinkIsDangling(const char *pszSymlink); + +/** + * RTSymlinkCreate link type argument. + */ +typedef enum RTSYMLINKTYPE +{ + /** Invalid value. */ + RTSYMLINKTYPE_INVALID = 0, + /** The link targets a directory. */ + RTSYMLINKTYPE_DIR, + /** The link targets a file (or whatever else). */ + RTSYMLINKTYPE_FILE, + /** It is not known what is being targeted. + * @remarks The RTSymlinkCreate API may probe the target to try figure + * out what is being targeted. */ + RTSYMLINKTYPE_UNKNOWN, + /** The end of the valid type values. */ + RTSYMLINKTYPE_END, + /** Blow the type up to 32-bit. */ + RTSYMLINKTYPE_32BIT_HACK = 0x7fffffff +} RTSYMLINKTYPE; + +/** @name RTSymlinkCreate flags. + * @{ */ +/** Don't allow symbolic links as part of the path. + * @remarks this flag is currently not implemented and will be ignored. */ +#define RTSYMLINKCREATE_FLAGS_NO_SYMLINKS RT_BIT(0) +/** @} */ + +/** + * Creates a symbolic link (@a pszSymlink) targeting @a pszTarget. + * + * @returns IPRT status code. + * + * @param pszSymlink The name of the symbolic link. + * @param pszTarget The path to the symbolic link target. This is + * relative to @a pszSymlink or an absolute path. + * @param enmType The symbolic link type. For Windows compatability + * it is very important to set this correctly. When + * RTSYMLINKTYPE_UNKNOWN is used, the API will try + * make a guess and may attempt query information + * about @a pszTarget in the process. + * @param fCreate Create flags, RTSYMLINKCREATE_FLAGS_*. + */ +RTDECL(int) RTSymlinkCreate(const char *pszSymlink, const char *pszTarget, + RTSYMLINKTYPE enmType, uint32_t fCreate); + +/** @name RTSymlinkDelete flags. + * @{ */ +/** Don't allow symbolic links as part of the path. + * @remarks this flag is currently not implemented and will be ignored. */ +#define RTSYMLINKDELETE_FLAGS_NO_SYMLINKS RT_BIT(0) +/** @} */ + +/** + * Deletes the specified symbolic link. + * + * This will try to refuse deleting non-symlinks, however there are usually + * races in the implementation of this check so no guarantees can be are made. + * + * @returns IPRT status code. + * @retval VERR_NOT_SYMLINK if @a pszSymlink does not specify a symbolic link. + * + * @param pszSymlink The symbolic link that should be removed. + * @param fDelete Delete flags, RTSYMLINKDELETE_FLAGS_*. + */ +RTDECL(int) RTSymlinkDelete(const char *pszSymlink, uint32_t fDelete); + +/** @name RTSymlinkRead flags. + * @{ */ +/** Don't allow symbolic links as part of the path. + * @remarks this flag is currently not implemented and will be ignored. */ +#define RTSYMLINKREAD_FLAGS_NO_SYMLINKS RT_BIT(0) +/** @} */ + +/** + * Read the symlink target. + * + * @returns IPRT status code. + * @retval VERR_NOT_SYMLINK if @a pszSymlink does not specify a symbolic link. + * @retval VERR_BUFFER_OVERFLOW if the link is larger than @a cbTarget. The + * buffer will contain what all we managed to read, fully terminated + * if @a cbTarget > 0. + * + * @param pszSymlink The symbolic link that should be read. + * @param pszTarget The target buffer. + * @param cbTarget The size of the target buffer. + * @param fRead Read flags, RTSYMLINKREAD_FLAGS_*. + */ +RTDECL(int) RTSymlinkRead(const char *pszSymlink, char *pszTarget, size_t cbTarget, uint32_t fRead); + +/** + * Read the symlink target into an API allocated buffer. + * + * This API eliminates the race involved in determining the right buffer size. + * + * @returns IPRT status code. + * @retval VERR_NOT_SYMLINK if @a pszSymlink does not specify a symbolic link. + * + * @param pszSymlink The symbolic link that should be read. + * @param ppszTarget Where to return the target string. Free the string + * by calling RTStrFree. + */ +RTDECL(int) RTSymlinkReadA(const char *pszSymlink, char **ppszTarget); + +/** @} */ + +RT_C_DECLS_END + +#endif /* !IPRT_INCLUDED_symlink_h */ + |