4084f829ec
Suppress shell error messages while expanding $ENV (which also causes errors while expanding $PS1 $PS2 and $PS4 to be suppressed as well). This allows any random garbage that happens to be in ENV to not cause noise when the shell starts (which is effectively all it did). On a parse error (for any of those vars) we also use "" as the result, which will be a null prompt, and avoid attempting to open any file for ENV. This does not in any way change what happens for a correctly parsed command substitution (either when it is executed when permitted for one of the prompts, or when it is not (which is always for ENV)) and commands run from those can still produce error output (but shell errors remain suppressed).
124 lines
4.5 KiB
C
124 lines
4.5 KiB
C
/* $NetBSD: error.h,v 1.22 2019/02/04 11:16:41 kre Exp $ */
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/*-
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kenneth Almquist.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)error.h 8.2 (Berkeley) 5/4/95
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*/
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#include <stdarg.h>
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/*
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* Types of operations (passed to the errmsg routine).
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*/
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#define E_OPEN 01 /* opening a file */
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#define E_CREAT 02 /* creating a file */
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#define E_EXEC 04 /* executing a program */
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/*
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* We enclose jmp_buf in a structure so that we can declare pointers to
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* jump locations. The global variable handler contains the location to
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* jump to when an exception occurs, and the global variable exception
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* contains a code identifying the exeception. To implement nested
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* exception handlers, the user should save the value of handler on entry
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* to an inner scope, set handler to point to a jmploc structure for the
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* inner scope, and restore handler on exit from the scope.
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*/
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#include <setjmp.h>
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struct jmploc {
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jmp_buf loc;
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};
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extern volatile int errors_suppressed;
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extern const char * volatile currentcontext;
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extern struct jmploc *handler;
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extern int exception;
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extern int exerrno; /* error for EXEXEC */
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/* exceptions */
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#define EXINT 0 /* SIGINT received */
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#define EXERROR 1 /* a generic error */
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#define EXSHELLPROC 2 /* execute a shell procedure */
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#define EXEXEC 3 /* command execution failed */
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#define EXEXIT 4 /* shell wants to exit(exitstatus) */
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/*
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* These macros allow the user to suspend the handling of interrupt signals
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* over a period of time. This is similar to SIGHOLD to or sigblock, but
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* much more efficient and portable. (But hacking the kernel is so much
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* more fun than worrying about efficiency and portability. :-))
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*/
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extern volatile int suppressint;
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extern volatile int intpending;
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#define INTOFF suppressint++
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#define INTON do { if (--suppressint == 0 && intpending) onint(); } while (0)
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#define FORCEINTON do { suppressint = 0; if (intpending) onint(); } while (0)
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#define CLEAR_PENDING_INT (intpending = 0)
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#define int_pending() intpending
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#if ! defined(SHELL_BUILTIN)
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void exraise(int) __dead;
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void onint(void);
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void error(const char *, ...) __dead __printflike(1, 2);
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void exerror(int, const char *, ...) __dead __printflike(2, 3);
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const char *errmsg(int, int);
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#endif /* ! SHELL_BUILTIN */
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void sh_err(int, const char *, ...) __dead __printflike(2, 3);
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void sh_verr(int, const char *, va_list) __dead __printflike(2, 0);
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void sh_errx(int, const char *, ...) __dead __printflike(2, 3);
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void sh_verrx(int, const char *, va_list) __dead __printflike(2, 0);
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void sh_warn(const char *, ...) __printflike(1, 2);
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void sh_vwarn(const char *, va_list) __printflike(1, 0);
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void sh_warnx(const char *, ...) __printflike(1, 2);
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void sh_vwarnx(const char *, va_list) __printflike(1, 0);
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void sh_exit(int) __dead;
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/*
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* BSD setjmp saves the signal mask, which violates ANSI C and takes time,
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* so we use _setjmp instead.
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*/
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#if defined(BSD) && !defined(__SVR4)
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#define setjmp(jmploc) _setjmp(jmploc)
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#define longjmp(jmploc, val) _longjmp(jmploc, val)
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#endif
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