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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[] = {
- EINTR, ALL, "interrupted",
- EACCES, ALL, "permission denied",
- EIO, ALL, "I/O error",
- ENOENT, E_OPEN, "no such file",
- ENOENT, E_CREAT, "directory nonexistent",
- ENOENT, E_EXEC, "not found",
- ENOTDIR, E_OPEN, "no such file",
- ENOTDIR, E_CREAT, "directory nonexistent",
- ENOTDIR, E_EXEC, "not found",
- EISDIR, ALL, "is a directory",
- /* EMFILE, ALL, "too many open files", */
- ENFILE, ALL, "file table overflow",
- ENOSPC, ALL, "file system full",
- #ifdef EDQUOT
- EDQUOT, ALL, "disk quota exceeded",
- #endif
- #ifdef ENOSR
- ENOSR, ALL, "no streams resources",
- #endif
- ENXIO, ALL, "no such device or address",
- EROFS, ALL, "read-only file system",
- ETXTBSY, ALL, "text busy",
- #ifdef SYSV
- EAGAIN, E_EXEC, "not enough memory",
- #endif
- ENOMEM, ALL, "not enough memory",
- #ifdef ENOLINK
- ENOLINK, ALL, "remote access failed"
- #endif
- #ifdef EMULTIHOP
- EMULTIHOP, ALL, "remote access failed",
- #endif
- #ifdef ECOMM
- ECOMM, ALL, "remote access failed",
- #endif
- #ifdef ESTALE
- ESTALE, ALL, "remote access failed",
- #endif
- #ifdef ETIMEDOUT
- ETIMEDOUT, ALL, "remote access failed",
- #endif
- #ifdef ELOOP
- ELOOP, ALL, "symbolic link loop",
- #endif
- E2BIG, E_EXEC, "argument list too long",
- #ifdef ELIBACC
- ELIBACC, E_EXEC, "shared library missing",
- #endif
- 0, 0, NULL
- };
-
-
- /*
- * 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;
- }
-