81 lines
2.4 KiB
C
81 lines
2.4 KiB
C
/*
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* Copyright (c) 2011, 2012, 2014, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* stdlib/exit.c
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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 <stdbool.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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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(dummy_file, __stdin_used);
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weak_alias(dummy_file, __stdout_used);
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DIR* __first_dir = NULL;
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pthread_mutex_t __first_dir_lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
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FILE* __first_file = NULL;
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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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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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