1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1997-2005 5 * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Kenneth Almquist. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)error.h 8.2 (Berkeley) 5/4/95 35 */ 36 37 #include <setjmp.h> 38 #include <signal.h> 39 40 /* 41 * Types of operations (passed to the errmsg routine). 42 */ 43 44 #define E_OPEN 01 /* opening a file */ 45 #define E_CREAT 02 /* creating a file */ 46 #define E_EXEC 04 /* executing a program */ 47 48 49 /* 50 * We enclose jmp_buf in a structure so that we can declare pointers to 51 * jump locations. The global variable handler contains the location to 52 * jump to when an exception occurs, and the global variable exception 53 * contains a code identifying the exeception. To implement nested 54 * exception handlers, the user should save the value of handler on entry 55 * to an inner scope, set handler to point to a jmploc structure for the 56 * inner scope, and restore handler on exit from the scope. 57 */ 58 59 struct jmploc { 60 jmp_buf loc; 61 }; 62 63 extern struct jmploc *handler; 64 extern int exception; 65 66 /* exceptions */ 67 #define EXINT 0 /* SIGINT received */ 68 #define EXERROR 1 /* a generic error */ 69 #define EXEXIT 4 /* exit the shell */ 70 71 72 /* 73 * These macros allow the user to suspend the handling of interrupt signals 74 * over a period of time. This is similar to SIGHOLD to or sigblock, but 75 * much more efficient and portable. (But hacking the kernel is so much 76 * more fun than worrying about efficiency and portability. :-)) 77 */ 78 79 extern int suppressint; 80 extern volatile sig_atomic_t intpending; 81 82 #define barrier() ({ __asm__ __volatile__ ("": : :"memory"); }) 83 #define INTOFF \ 84 ({ \ 85 suppressint++; \ 86 barrier(); \ 87 0; \ 88 }) 89 #ifdef REALLY_SMALL 90 void __inton(void); 91 #define INTON __inton() 92 #else 93 #define INTON \ 94 ({ \ 95 barrier(); \ 96 if (--suppressint == 0 && intpending) onint(); \ 97 0; \ 98 }) 99 #endif 100 #define FORCEINTON \ 101 ({ \ 102 barrier(); \ 103 suppressint = 0; \ 104 if (intpending) onint(); \ 105 0; \ 106 }) 107 #define SAVEINT(v) ((v) = suppressint) 108 #define RESTOREINT(v) \ 109 ({ \ 110 barrier(); \ 111 if ((suppressint = (v)) == 0 && intpending) onint(); \ 112 0; \ 113 }) 114 #define CLEAR_PENDING_INT intpending = 0 115 #define int_pending() intpending 116 117 void exraise(int) __attribute__((__noreturn__)); 118 #ifdef USE_NORETURN 119 void onint(void) __attribute__((__noreturn__)); 120 #else 121 void onint(void); 122 #endif 123 extern int errlinno; 124 void sh_error(const char *, ...) __attribute__((__noreturn__)); 125 void exerror(int, const char *, ...) __attribute__((__noreturn__)); 126 const char *errmsg(int, int); 127 128 void sh_warnx(const char *, ...); 129