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Diffstat (limited to 'usr/dash/error.h')
| -rw-r--r-- | usr/dash/error.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/usr/dash/error.h b/usr/dash/error.h new file mode 100644 index 0000000..f91d11d --- /dev/null +++ b/usr/dash/error.h @@ -0,0 +1,133 @@ +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1997-2005 + * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kenneth Almquist. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)error.h 8.2 (Berkeley) 5/4/95 + */ + +#ifndef DASH_ERROR_H +#define DASH_ERROR_H + +#include <setjmp.h> +#include <signal.h> + +/* + * Types of operations (passed to the errmsg routine). + */ + +#define E_OPEN 01 /* opening a file */ +#define E_CREAT 02 /* creating a file */ +#define E_EXEC 04 /* executing a program */ + + +/* + * We enclose jmp_buf in a structure so that we can declare pointers to + * jump locations. The global variable handler contains the location to + * jump to when an exception occurs, and the global variable exception + * contains a code identifying the exeception. To implement nested + * exception handlers, the user should save the value of handler on entry + * to an inner scope, set handler to point to a jmploc structure for the + * inner scope, and restore handler on exit from the scope. + */ + +struct jmploc { + jmp_buf loc; +}; + +extern struct jmploc *handler; +extern int exception; + +/* exceptions */ +#define EXINT 0 /* SIGINT received */ +#define EXERROR 1 /* a generic error */ +#define EXEXIT 4 /* exit the shell */ + + +/* + * These macros allow the user to suspend the handling of interrupt signals + * over a period of time. This is similar to SIGHOLD to or sigblock, but + * much more efficient and portable. (But hacking the kernel is so much + * more fun than worrying about efficiency and portability. :-)) + */ + +extern int suppressint; +extern volatile sig_atomic_t intpending; + +#define barrier() ({ __asm__ __volatile__ ("": : :"memory"); }) +#define INTOFF \ + ({ \ + suppressint++; \ + barrier(); \ + 0; \ + }) +#ifdef REALLY_SMALL +void __inton(void); +#define INTON __inton() +#else +#define INTON \ + ({ \ + barrier(); \ + if (--suppressint == 0 && intpending) onint(); \ + 0; \ + }) +#endif +#define FORCEINTON \ + ({ \ + barrier(); \ + suppressint = 0; \ + if (intpending) onint(); \ + 0; \ + }) +#define SAVEINT(v) ((v) = suppressint) +#define RESTOREINT(v) \ + ({ \ + barrier(); \ + if ((suppressint = (v)) == 0 && intpending) onint(); \ + 0; \ + }) +#define CLEAR_PENDING_INT intpending = 0 +#define int_pending() intpending + +void exraise(int) __attribute__((__noreturn__)); +#ifdef USE_NORETURN +void onint(void) __attribute__((__noreturn__)); +#else +void onint(void); +#endif +extern int errlinno; +void sh_error(const char *, ...) __attribute__((__noreturn__)); +void exerror(int, const char *, ...) __attribute__((__noreturn__)); +const char *errmsg(int, int); + +void sh_warnx(const char *, ...); + +#endif /* DASH_ERROR_H */ |