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103 lines
2.2 KiB
C++
103 lines
2.2 KiB
C++
/*
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* \brief file descriptor allocator interface
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* \author Christian Prochaska
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* \date 2010-01-21
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*
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*/
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/*
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* Copyright (C) 2010-2017 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_PLUGIN__FD_ALLOC_H_
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#define _LIBC_PLUGIN__FD_ALLOC_H_
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#include <base/allocator_avl.h>
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#include <base/lock.h>
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#include <base/log.h>
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#include <os/path.h>
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/* libc includes */
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#include <stdlib.h>
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#include <string.h>
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#include <libc-plugin/plugin.h>
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enum { MAX_NUM_FDS = 1024 };
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namespace Libc {
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/**
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* Plugin-specific file-descriptor context
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*/
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struct Plugin_context { virtual ~Plugin_context() { } };
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enum { ANY_FD = -1 };
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struct File_descriptor
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{
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int libc_fd = -1;
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char const *fd_path = 0; /* for 'fchdir', 'fstat' */
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Plugin *plugin = 0;
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Plugin_context *context = 0;
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int flags = 0; /* for 'fcntl' */
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bool cloexec = 0; /* for 'fcntl' */
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Genode::Lock lock;
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void path(char const *newpath)
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{
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if (fd_path) { Genode::warning("may leak former FD path memory"); }
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if (newpath) {
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Genode::size_t const path_size = ::strlen(newpath) + 1;
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char *buf = (char*)malloc(path_size);
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if (!buf) {
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Genode::error("could not allocate path buffer for libc_fd ",
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libc_fd, libc_fd == ANY_FD ? " (any)" : "");
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return;
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}
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::memcpy(buf, newpath, path_size);
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fd_path = buf;
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} else
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fd_path = 0;
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}
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};
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class File_descriptor_allocator : Allocator_avl_tpl<File_descriptor>
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{
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private:
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Genode::Lock _lock;
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public:
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/**
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* Constructor
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*/
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File_descriptor_allocator(Genode::Allocator &md_alloc);
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/**
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* Allocate file descriptor
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*/
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File_descriptor *alloc(Plugin *plugin, Plugin_context *context, int libc_fd = -1);
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/**
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* Release file descriptor
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*/
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void free(File_descriptor *fdo);
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File_descriptor *find_by_libc_fd(int libc_fd);
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};
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/**
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* Return singleton instance of file-descriptor allocator
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*/
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extern File_descriptor_allocator *file_descriptor_allocator();
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}
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#endif /* _LIBC_PLUGIN__FD_ALLOC_H_ */
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