77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/*
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* \brief File-operation utilities
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* \author Christian Helmuth
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* \author Emery Hemingway
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* \date 2015-06-30
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*/
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/*
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* Copyright (C) 2015-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _LIBC__INTERNAL__FILE_H_
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#define _LIBC__INTERNAL__FILE_H_
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/* Genode includes */
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#include <base/log.h>
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/* Genode-specific libc interfaces */
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#include <libc-plugin/fd_alloc.h>
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#include <libc-plugin/plugin_registry.h>
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enum { INVALID_FD = -1 };
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/**
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* Find plugin responsible for the specified libc file descriptor
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*
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* \param func_name function name of the caller for printing an error message
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*/
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static inline Libc::File_descriptor *libc_fd_to_fd(int libc_fd, const char *func_name)
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{
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Libc::File_descriptor *fd =
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Libc::file_descriptor_allocator()->find_by_libc_fd(libc_fd);
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if (!fd)
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Genode::error("no plugin found for ", func_name, "(", libc_fd, ")");
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return fd;
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}
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/**
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* Generate body of wrapper function taking a file descriptor as first argument
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*/
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#define FD_FUNC_WRAPPER_GENERIC(result_stm, result_err_val, func_name, libc_fd, ...) \
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{ \
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File_descriptor *fd = libc_fd_to_fd(libc_fd, #func_name); \
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if (!fd || !fd->plugin) { \
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errno = EBADF; \
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result_stm result_err_val; \
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} else \
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result_stm fd->plugin->func_name(fd, ##__VA_ARGS__ ); \
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}
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#define FD_FUNC_WRAPPER(func_name, libc_fd, ...) \
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FD_FUNC_WRAPPER_GENERIC(return, INVALID_FD, func_name, libc_fd, ##__VA_ARGS__ )
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/**
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* Generate body of wrapper function taking a path name as first argument
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*/
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#define FNAME_FUNC_WRAPPER_GENERIC(result_stm, func_name, path, ...) \
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{ \
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Plugin *plugin = plugin_registry()->get_plugin_for_##func_name(path, ##__VA_ARGS__); \
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if (!plugin) { \
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Genode::error("no plugin found for ", #func_name, "(\"", Genode::Cstring(path), "\")");\
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errno = ENOSYS; \
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result_stm -1; \
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} else \
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result_stm plugin->func_name(path, ##__VA_ARGS__); \
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}
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#define FNAME_FUNC_WRAPPER(func_name, path, ...) \
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FNAME_FUNC_WRAPPER_GENERIC(return, func_name, path, ##__VA_ARGS__ )
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#endif /* _LIBC__INTERNAL__FILE_H_ */
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