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sortix--sortix/libc/init/init.cpp
2013-12-17 14:30:39 +01:00

71 lines
2.5 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library 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 Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
init/init.cpp
Initializes the process by setting up the heap, signal handling, static
memory and other useful things.
*******************************************************************************/
#include <malloc.h>
#include <string.h>
extern "C" { char* program_invocation_name; }
extern "C" { char* program_invocation_short_name; }
extern "C" void init_error_functions();
extern "C" void init_stdio();
extern "C" void init_signal();
static char* find_last_elem(char* str)
{
size_t len = strlen(str);
for ( size_t i = len; i; i-- )
if ( str[i-1] == '/' )
return str + i;
return str;
}
extern "C" void initialize_standard_library(int argc, char* argv[])
{
// We got ourselves a little bootstrap problem. We'd like these variables to
// be available during early startup - however, we can't create a copy yet
// because the heap isn't initialized yet. Instead, we'll simply point at
// the original value - we're safe since argv[0] is not supposed to be
// modified until main is run. Once we heap is up, we'll strdup.
const char* argv0 = argc ? argv[0] : "";
program_invocation_name = (char*) argv0;
program_invocation_short_name = find_last_elem((char*) argv0);
// Initialize stuff such as errno.
init_error_functions();
// It's probably best to initialize the Unix signals early on.
init_signal();
// Initialize the dynamic heap.
_init_heap();
// Initialize stdio.
init_stdio();
// We can now create a copy of the program name variables safely.
program_invocation_name = strdup(program_invocation_name);
program_invocation_short_name = find_last_elem(program_invocation_name);
}