1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2008 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #pragma prototyped 23 24 /* 25 * ANSI C atexit() 26 * arrange for func to be called LIFO on exit() 27 */ 28 29 #include <ast.h> 30 31 #if _lib_atexit 32 33 NoN(atexit) 34 35 #else 36 37 #if _lib_onexit || _lib_on_exit 38 39 #if !_lib_onexit 40 #define onexit on_exit 41 #endif 42 43 extern int onexit(void(*)(void)); 44 45 int 46 atexit(void (*func)(void)) 47 { 48 return(onexit(func)); 49 } 50 51 #else 52 53 struct list 54 { 55 struct list* next; 56 void (*func)(void); 57 }; 58 59 static struct list* funclist; 60 61 extern void _exit(int); 62 63 int 64 atexit(void (*func)(void)) 65 { 66 register struct list* p; 67 68 if (!(p = newof(0, struct list, 1, 0))) return(-1); 69 p->func = func; 70 p->next = funclist; 71 funclist = p; 72 return(0); 73 } 74 75 void 76 _ast_atexit(void) 77 { 78 register struct list* p; 79 80 while (p = funclist) 81 { 82 funclist = p->next; 83 (*p->func)(); 84 } 85 } 86 87 #if _std_cleanup 88 89 #if _lib__cleanup 90 extern void _cleanup(void); 91 #endif 92 93 void 94 exit(int code) 95 { 96 _ast_atexit(); 97 #if _lib__cleanup 98 _cleanup(); 99 #endif 100 _exit(code); 101 } 102 103 #else 104 105 void 106 _cleanup(void) 107 { 108 _ast_atexit(); 109 } 110 111 #endif 112 113 #endif 114 115 #endif 116