aa66b5d62f
This patch adjusts the implementation of the base library and core such that the code no longer relies on deprecated APIs except for very few cases, mainly to keep those deprecated APIs in tact for now. The most prominent changes are: - Removing the use of base/printf.h - Removing of the log backend for printf. The 'Console' with the format-string parser is still there along with 'snprintf.h' because the latter is still used at a few places, most prominently the 'Connection' classes. - Removing the notion of a RAM session, which does not exist in Genode anymore. Still the types were preserved (by typedefs to PD session) to keep up compatibility. But this transition should come to an end now. - Slight rennovation of core's tracing service, e.g., the use of an Attached_dataspace as the Argument_buffer. - Reducing the reliance on global accessors like deprecated_env() or core_env(). Still there is a longish way to go to eliminate all such calls. A useful pattern (or at least a stop-gap solution) is to pass the 'Env' to the individual compilation units via init functions. - Avoiding the use of the old 'Child_policy::resolve_session_request' interface that returned a 'Service' instead of a 'Route'. Issue #1987
148 lines
3.1 KiB
C++
148 lines
3.1 KiB
C++
/*
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* \brief Redirect VirtualBox LOG output to Genode LOG
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* \author Norman Feske
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* \date 2013-08-23
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*/
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/*
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* Copyright (C) 2013-2017 Genode Labs GmbH
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*
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* This file is distributed under the terms of the GNU General Public License
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* version 2.
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*/
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/* libc plugin interface */
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#include <libc-plugin/plugin.h>
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#include <libc-plugin/fd_alloc.h>
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/* libc includes */
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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namespace {
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struct Plugin_context : Libc::Plugin_context { };
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class Plugin : public Libc::Plugin
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{
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private:
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Plugin_context _context;
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Libc::File_descriptor *_fd;
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char const *log_file_name() const { return "/log"; }
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bool _match(char const *name) const
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{
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return strcmp(name, log_file_name()) == 0;
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}
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public:
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Plugin() :
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_fd(Libc::file_descriptor_allocator()->alloc(this, &_context))
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{ }
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bool supports_stat(const char *path)
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{
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return _match(path);
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}
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bool supports_open(const char *path, int flags)
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{
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return _match(path);
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}
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int stat(const char *path, struct stat *buf)
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{
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bool const match = _match(path);
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if (buf && match) {
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Genode::memset(buf, 0, sizeof(struct stat));
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buf->st_mode = S_IFCHR;
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}
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errno = match ? 0 : ENOENT;
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return match ? 0 : -1;
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}
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Libc::File_descriptor *open(const char *pathname, int flags)
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{
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return _match(pathname) ? _fd : 0;
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}
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int fcntl(Libc::File_descriptor *fd, int cmd, long arg)
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{
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switch (cmd) {
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case F_GETFL: return O_WRONLY;
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default: Genode::error("fcntl(): command ", cmd, " not supported");
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return -1;
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}
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}
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int fstat(Libc::File_descriptor *, struct stat *buf)
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{
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/*
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* The following values were obtained with small test program that
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* calls fstat for stdout on linux.
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*/
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buf->st_dev = 11;
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buf->st_ino = 4;
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buf->st_mode = 8592;
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buf->st_nlink = 1;
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buf->st_uid = 0;
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buf->st_gid = 0;
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buf->st_rdev = 34818;
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buf->st_size = 0;
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buf->st_blksize = 1024;
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buf->st_blocks = 0;
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return 0;
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}
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ssize_t write(Libc::File_descriptor *fd, const void *buf, ::size_t count)
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{
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if (fd != _fd) {
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errno = EBADF;
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return -1;
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}
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char *src = (char *)buf;
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/* count does not include the trailing '\0' */
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int orig_count = count;
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while (count > 0) {
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char tmp[128];
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int curr_count= count > sizeof(tmp) - 1 ? sizeof(tmp) - 1 : count;
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strncpy(tmp, src, curr_count);
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tmp[curr_count > 0 ? curr_count : 0] = 0;
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Genode::log(Genode::Cstring(tmp));
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count -= curr_count;
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src += curr_count;
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}
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return orig_count;
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}
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int ioctl(Libc::File_descriptor *, int request, char *)
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{
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/*
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* Some programs or libraries use to perform 'TIOCGETA'
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* operations on stdout, in particular the termios module of
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* Python. Those programs may break if 'tcgetattr' return with
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* an error. We pretend to be more successful than we really
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* are to make them happy.
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*/
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return 0;
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}
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};
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} /* unnamed namespace */
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extern "C" void init_libc_vbox_logger(void)
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{
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static Plugin plugin;
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}
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