106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/*
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* Copyright (c) 1990 Regents of the University of California.
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* All rights reserved.
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*
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* %sccs.include.redist.c%
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*/
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/*
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FUNCTION
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<<exit>>---end program execution
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INDEX
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exit
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ANSI_SYNOPSIS
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#include <stdlib.h>
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void exit(int <[code]>);
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TRAD_SYNOPSIS
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#include <stdlib.h>
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void exit(<[code]>)
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int <[code]>;
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DESCRIPTION
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Use <<exit>> to return control from a program to the host operating
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environment. Use the argument <[code]> to pass an exit status to the
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operating environment: two particular values, <<EXIT_SUCCESS>> and
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<<EXIT_FAILURE>>, are defined in `<<stdlib.h>>' to indicate success or
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failure in a portable fashion.
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<<exit>> does two kinds of cleanup before ending execution of your
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program. First, it calls all application-defined cleanup functions
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you have enrolled with <<atexit>>. Second, files and streams are
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cleaned up: any pending output is delivered to the host system, each
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open file or stream is closed, and files created by <<tmpfile>> are
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deleted.
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RETURNS
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<<exit>> does not return to its caller.
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PORTABILITY
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ANSI C requires <<exit>>, and specifies that <<EXIT_SUCCESS>> and
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<<EXIT_FAILURE>> must be defined.
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Supporting OS subroutines required: <<_exit>>.
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*/
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#include <stdlib.h>
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#include <unistd.h> /* for _exit() declaration */
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#include <reent.h>
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#ifndef _REENT_ONLY
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/*
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* Exit, flushing stdio buffers if necessary.
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*/
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void
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_DEFUN (exit, (code),
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int code)
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{
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register struct _atexit *p;
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register struct _on_exit_args * args;
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register int n;
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int i;
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#ifdef _REENT_SMALL
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p = &_GLOBAL_REENT->_atexit;
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args = p->_on_exit_args_ptr;
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if (args == NULL)
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{
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for (n = p->_ind; n--;)
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p->_fns[n] ();
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}
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else
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{
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for (n = p->_ind - 1, i = (n >= 0) ? (1 << n) : 0; n >= 0; --n, i >>= 1)
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if (args->_fntypes & i)
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(*((void (*)(int, void *)) p->_fns[n]))(code, args->_fnargs[n]);
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else
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p->_fns[n] ();
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}
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#else
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p = _GLOBAL_REENT->_atexit;
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while (p)
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{
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args = & p->_on_exit_args;
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for (n = p->_ind - 1, i = (n >= 0) ? (1 << n) : 0; n >= 0; --n, i >>= 1)
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if (args->_fntypes & i)
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(*((void (*)(int, void *)) p->_fns[n]))(code, args->_fnargs[n]);
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else
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p->_fns[n] ();
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p = p->_next;
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}
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#endif
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if (_GLOBAL_REENT->__cleanup)
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(*_GLOBAL_REENT->__cleanup) (_GLOBAL_REENT);
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_exit (code);
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}
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#endif
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