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18504b4801
Merging the config_args library with the POSIX library supplies 'argc' and 'argv' arguments to components using a 'main' entry. Fix #2218 Ref #1987
74 lines
1.6 KiB
C++
74 lines
1.6 KiB
C++
/*
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* \brief Entry point for POSIX applications
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* \author Norman Feske
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* \date 2016-12-23
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*/
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/*
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* Copyright (C) 2016 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 General Public License version 2.
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*/
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/* Genode includes */
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#include <libc/component.h>
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/* libc includes */
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#include <stdlib.h> /* 'malloc' */
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#include <stdlib.h> /* 'exit' */
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extern char **genode_argv;
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extern int genode_argc;
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extern char **genode_envp;
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/* provided by the application */
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extern "C" int main(int argc, char ** argv, char **envp);
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void Libc::Component::construct(Libc::Env &env)
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{
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using Genode::Xml_node;
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using Genode::Xml_attribute;
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env.config([&] (Xml_node const &node) {
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int argc = 0;
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static char **argv;
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/* count the number of arguments */
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node.for_each_sub_node("arg", [&] (Xml_node const &arg_node) {
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/* check if the 'value' attribute exists */
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if (arg_node.has_attribute("value"))
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++argc;
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});
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if (argc == 0)
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return;
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argv = (char**)malloc((argc + 1) * sizeof(char*));
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/* read the arguments */
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int i = 0;
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node.for_each_sub_node("arg", [&] (Xml_node const &arg_node) {
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try {
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Xml_attribute attr = arg_node.attribute("value");
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Genode::size_t const arg_len = attr.value_size()+1;
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argv[i] = (char*)malloc(arg_len);
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attr.value(argv[i], arg_len);
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++i;
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} catch (Xml_node::Nonexistent_sub_node) { }
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});
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argv[i] = nullptr;
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/* register command-line arguments at Genode's startup code */
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genode_argc = argc;
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genode_argv = argv;
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});
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/* TODO: environment variables, see #2236 */
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exit(main(genode_argc, genode_argv, genode_envp));
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}
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