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- /*-
- * Copyright (c) 1991 The Regents of the University of California.
- * 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)error.c 5.1 (Berkeley) 3/7/91";
- #endif /* not lint */
-
- /*
- * Errors and exceptions.
- */
-
- #include "shell.h"
- #include "main.h"
- #include "options.h"
- #include "output.h"
- #include "error.h"
- #include <signal.h>
- #ifdef __STDC__
- #include "stdarg.h"
- #else
- #include <varargs.h>
- #endif
- #include <errno.h>
-
-
- /*
- * Code to handle exceptions in C.
- */
-
- struct jmploc *handler;
- int exception;
- volatile int suppressint;
- volatile int intpending;
- char *commandname;
-
-
- /*
- * Called to raise an exception. Since C doesn't include exceptions, we
- * just do a longjmp to the exception handler. The type of exception is
- * stored in the global variable "exception".
- */
-
- void
- exraise(e) {
- if (handler == NULL)
- abort();
- exception = e;
- longjmp(handler->loc, 1);
- }
-
-
- /*
- * Called from trap.c when a SIGINT is received. (If the user specifies
- * that SIGINT is to be trapped or ignored using the trap builtin, then
- * this routine is not called.) Suppressint is nonzero when interrupts
- * are held using the INTOFF macro. The call to _exit is necessary because
- * there is a short period after a fork before the signal handlers are
- * set to the appropriate value for the child. (The test for iflag is
- * just defensive programming.)
- */
-
- void
- onint() {
- if (suppressint) {
- intpending++;
- return;
- }
- intpending = 0;
- #ifdef BSD
- sigsetmask(0);
- #endif
- if (rootshell && iflag)
- exraise(EXINT);
- else
- _exit(128 + SIGINT);
- }
-
-
-
- void
- error2(a, b)
- char *a, *b;
- {
- error("%s: %s", a, b);
- }
-
-
- /*
- * Error is called to raise the error exception. If the first argument
- * is not NULL then error prints an error message using printf style
- * formatting. It then raises the error exception.
- */
-
- #ifdef __STDC__
- void
- error(char *msg, ...) {
- #else
- void
- error(va_alist)
- va_dcl
- {
- char *msg;
- #endif
- va_list ap;
-
- CLEAR_PENDING_INT;
- INTOFF;
- #ifdef __STDC__
- va_start(ap, msg);
- #else
- va_start(ap);
- msg = va_arg(ap, char *);
- #endif
- #ifdef DEBUG
- if (msg)
- TRACE(("error(\"%s\") pid=%d\n", msg, getpid()));
- else
- TRACE(("error(NULL) pid=%d\n", getpid()));
- #endif
- if (msg) {
- if (commandname)
- outfmt(&errout, "%s: ", commandname);
- doformat(&errout, msg, ap);
- out2c('\n');
- }
- va_end(ap);
- flushall();
- exraise(EXERROR);
- }
-
-
-
- /*
- * Table of error messages.
- */
-
- struct errname {
- short errcode; /* error number */
- short action; /* operation which encountered the error */
- char *msg; /* text describing the error */
- };
-
-
- #define ALL (E_OPEN|E_CREAT|E_EXEC)
-
- STATIC const struct errname errormsg[] = {
- EERROR, ALL, "generic error",
- EDRVNR, ALL, "drive not ready",
- EUNCMD, ALL, "unknown drive command",
- E_CRC, ALL, "CRC error",
- EBADRQ, ALL, "bad drive request",
- E_SEEK, ALL, "seek error",
- EMEDIA, ALL, "unknown medium format",
- ESECNF, ALL, "sector not found",
- EPAPER, ALL, "out of paper",
- EWRITEF, ALL, "write fault",
- EREADF, ALL, "read fault",
- EROFS, E_CREAT, "read-only filesystem",
- E_CHNG, ALL, "media changed",
- EUNDEV, ALL, "unknown drive",
- EBADSF, ALL, "bad sector on format",
- EOTHER, ALL, "insert other disk request",
- EINVAL, ALL, "unimplemented system call",
- ENOENT, ALL, "no such file or directory (or pid)",
- EPATH, ALL, "path not found",
- EMFILE, E_OPEN|E_CREAT, "no more open files",
- EACCESS, ALL, "access denied",
- EBADF, ALL, "bad file descriptor",
- ENOMEM, ALL, "out of memory",
- EFAULT, ALL, "invalid memory block address",
- ENXIO, ALL, "invalid drive specification",
- EXDEV, ALL, "cannot move across file systems",
- EBADARG, ALL, "bad arguments to system call",
- EINTRN, ALL, "internal OS error",
- EPLFMT, E_EXEC, "bad program load format",
- EGSBF, ALL, "memory block growth failure",
- EMLINK, ALL, "too many symbolic links",
- EEXIST, E_CREAT, "file exists",
- ENAMETOOLONG, ALL, "file name too long",
- ERANGE, ALL, "math range error",
- EDOM, ALL, "math domain error"
- };
-
-
- /*
- * Return a string describing an error. The returned string may be a
- * pointer to a static buffer that will be overwritten on the next call.
- * Action describes the operation that got the error.
- */
-
- char *
- errmsg(e, action) {
- struct errname const *ep;
- static char buf[12];
-
- for (ep = errormsg ; ep->errcode ; ep++) {
- if (ep->errcode == e && (ep->action & action) != 0)
- return ep->msg;
- }
- fmtstr(buf, sizeof buf, "error %d", e);
- return buf;
- }
-