85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2014, 2015.
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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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stdlib/exit.cpp
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Terminates the current process.
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*******************************************************************************/
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#include <dirent.h>
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#include <DIR.h>
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#include <FILE.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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extern "C" { struct exit_handler* __exit_handler_stack = NULL; }
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static pthread_mutex_t exit_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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static bool currently_exiting = false;
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static FILE* volatile dummy_file = NULL; // volatile due to constant folding bug
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weak_alias_cxx(dummy_file, __stdin_used, "_ZL10dummy_file");
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weak_alias_cxx(dummy_file, __stdout_used, "_ZL10dummy_file");
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extern "C" { DIR* __first_dir = NULL; }
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extern "C" { pthread_mutex_t __first_dir_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; }
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extern "C" { FILE* __first_file = NULL; }
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extern "C" { pthread_mutex_t __first_file_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; }
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static void exit_file(FILE* fp)
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{
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if ( !fp )
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return;
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flockfile(fp);
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if ( fp->fflush_indirect )
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fp->fflush_indirect(fp);
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if ( fp->close_func )
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fp->close_func(fp->user);
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}
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extern "C" void exit(int status)
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{
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// It's undefined behavior to call this function more than once: If more
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// than one thread calls the function we'll wait until the process dies.
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pthread_mutex_lock(&exit_lock);
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// It's undefined behavior to call this function more than once: If a
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// cleanup function calls this function we'll self-destruct immediately.
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if ( currently_exiting )
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_exit(status);
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currently_exiting = true;
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while ( __exit_handler_stack )
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{
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__exit_handler_stack->hook(status, __exit_handler_stack->param);
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__exit_handler_stack = __exit_handler_stack->next;
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}
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pthread_mutex_lock(&__first_file_lock);
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exit_file(__stdin_used);
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exit_file(__stdout_used);
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for ( FILE* fp = __first_file; fp; fp = fp->next )
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exit_file(fp);
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_exit(status);
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}
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