bin/sh/error.h

   1 /*-
   2  * Copyright (c) 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Kenneth Almquist.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)error.h     8.2 (Berkeley) 5/4/95
  33  * $FreeBSD$
  34  */
  35
  36 /*
  37  * We enclose jmp_buf in a structure so that we can declare pointers to
  38  * jump locations.  The global variable handler contains the location to
  39  * jump to when an exception occurs, and the global variable exception
  40  * contains a code identifying the exception.  To implement nested
  41  * exception handlers, the user should save the value of handler on entry
  42  * to an inner scope, set handler to point to a jmploc structure for the
  43  * inner scope, and restore handler on exit from the scope.
  44  */
  45
  46 #include <setjmp.h>
  47 #include <signal.h>
  48
  49 struct jmploc {
  50         jmp_buf loc;
  51 };
  52
  53 extern struct jmploc *handler;
  54 extern volatile sig_atomic_t exception;
  55
  56 /* exceptions */
  57 #define EXINT 0         /* SIGINT received */
  58 #define EXERROR 1       /* a generic error */
  59 #define EXEXEC 2        /* command execution failed */
  60 #define EXEXIT 3        /* call exitshell(exitstatus) */
  61
  62
  63 /*
  64  * These macros allow the user to suspend the handling of interrupt signals
  65  * over a period of time.  This is similar to SIGHOLD to or sigblock, but
  66  * much more efficient and portable.  (But hacking the kernel is so much
  67  * more fun than worrying about efficiency and portability. :-))
  68  */
  69
  70 extern volatile sig_atomic_t suppressint;
  71 extern volatile sig_atomic_t intpending;
  72
  73 #define INTOFF suppressint++
  74 #define INTON { if (--suppressint == 0 && intpending) onint(); }
  75 #define is_int_on() suppressint
  76 #define SETINTON(s) suppressint = (s)
  77 #define FORCEINTON {suppressint = 0; if (intpending) onint();}
  78 #define SET_PENDING_INT intpending = 1
  79 #define CLEAR_PENDING_INT intpending = 0
  80 #define int_pending() intpending
  81
  82 void exraise(int) __dead2;
  83 void onint(void) __dead2;
  84 void warning(const char *, ...) __printflike(1, 2);
  85 void error(const char *, ...) __printf0like(1, 2) __dead2;
  86 void exerror(int, const char *, ...) __printf0like(2, 3) __dead2;
  87
  88
  89 /*
  90  * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
  91  * so we use _setjmp instead.
  92  */
  93
  94 #define setjmp(jmploc)  _setjmp(jmploc)
  95 #define longjmp(jmploc, val)    _longjmp(jmploc, val)