72 lines
2.5 KiB
C++
72 lines
2.5 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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init/init.cpp
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Initializes the process by setting up the heap, signal handling, static
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memory and other useful things.
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*******************************************************************************/
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#include <malloc.h>
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#include <string.h>
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extern "C" { char* program_invocation_name; }
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extern "C" { char* program_invocation_short_name; }
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extern "C" void init_error_functions();
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extern "C" void init_stdio();
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extern "C" void init_signal();
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static char* find_last_elem(char* str)
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{
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size_t len = strlen(str);
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for ( size_t i = len; i; i-- )
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if ( str[i-1] == '/' )
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return str + i;
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return str;
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}
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extern "C" void initialize_standard_library(int argc, char* argv[])
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{
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// We got ourselves a little bootstrap problem. We'd like these variables to
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// be available during early startup - however, we can't create a copy yet
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// because the heap isn't initialized yet. Instead, we'll simply point at
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// the original value - we're safe since argv[0] is not supposed to be
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// modified until main is run. Once we heap is up, we'll strdup.
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const char* argv0 = argc ? argv[0] : "";
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program_invocation_name = (char*) argv0;
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program_invocation_short_name = find_last_elem((char*) argv0);
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// Initialize stuff such as errno.
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init_error_functions();
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// It's probably best to initialize the Unix signals early on.
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init_signal();
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// Initialize the dynamic heap.
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_init_heap();
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// Initialize stdio.
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init_stdio();
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// We can now create a copy of the program name variables safely.
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program_invocation_name = strdup(program_invocation_name);
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program_invocation_short_name = find_last_elem(program_invocation_name);
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}
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