250 lines
6.0 KiB
C
250 lines
6.0 KiB
C
/*-
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static char sccsid[] = "@(#)error.c 8.1 (Berkeley) 5/31/93";
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#endif /* not lint */
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/*
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* Errors and exceptions.
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*/
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#include "shell.h"
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#include "main.h"
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#include "options.h"
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#include "output.h"
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#include "error.h"
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#include <signal.h>
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#ifdef __STDC__
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#include "stdarg.h"
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#else
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#include <varargs.h>
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#endif
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#include <errno.h>
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/*
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* Code to handle exceptions in C.
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*/
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struct jmploc *handler;
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int exception;
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volatile int suppressint;
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volatile int intpending;
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char *commandname;
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/*
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* Called to raise an exception. Since C doesn't include exceptions, we
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* just do a longjmp to the exception handler. The type of exception is
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* stored in the global variable "exception".
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*/
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void
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exraise(e) {
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if (handler == NULL)
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abort();
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exception = e;
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longjmp(handler->loc, 1);
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}
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/*
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* Called from trap.c when a SIGINT is received. (If the user specifies
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* that SIGINT is to be trapped or ignored using the trap builtin, then
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* this routine is not called.) Suppressint is nonzero when interrupts
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* are held using the INTOFF macro. The call to _exit is necessary because
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* there is a short period after a fork before the signal handlers are
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* set to the appropriate value for the child. (The test for iflag is
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* just defensive programming.)
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*/
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void
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onint() {
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if (suppressint) {
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intpending++;
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return;
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}
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intpending = 0;
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#ifdef BSD
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sigsetmask(0);
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#endif
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if (rootshell && iflag)
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exraise(EXINT);
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else
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_exit(128 + SIGINT);
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}
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void
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error2(a, b)
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char *a, *b;
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{
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error("%s: %s", a, b);
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}
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/*
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* Error is called to raise the error exception. If the first argument
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* is not NULL then error prints an error message using printf style
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* formatting. It then raises the error exception.
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*/
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#ifdef __STDC__
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void
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error(char *msg, ...) {
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#else
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void
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error(va_alist)
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va_dcl
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{
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char *msg;
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#endif
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va_list ap;
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CLEAR_PENDING_INT;
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INTOFF;
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#ifdef __STDC__
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va_start(ap, msg);
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#else
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va_start(ap);
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msg = va_arg(ap, char *);
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#endif
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#ifdef DEBUG
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if (msg)
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TRACE(("error(\"%s\") pid=%d\n", msg, getpid()));
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else
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TRACE(("error(NULL) pid=%d\n", getpid()));
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#endif
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if (msg) {
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if (commandname)
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outfmt(&errout, "%s: ", commandname);
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doformat(&errout, msg, ap);
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out2c('\n');
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}
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va_end(ap);
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flushall();
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exraise(EXERROR);
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}
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/*
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* Table of error messages.
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*/
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struct errname {
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short errcode; /* error number */
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short action; /* operation which encountered the error */
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char *msg; /* text describing the error */
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};
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#define ALL (E_OPEN|E_CREAT|E_EXEC)
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STATIC const struct errname errormsg[] = {
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EINTR, ALL, "interrupted",
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EACCES, ALL, "permission denied",
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EIO, ALL, "I/O error",
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ENOENT, E_OPEN, "no such file",
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ENOENT, E_CREAT, "directory nonexistent",
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ENOENT, E_EXEC, "not found",
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ENOTDIR, E_OPEN, "no such file",
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ENOTDIR, E_CREAT, "directory nonexistent",
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ENOTDIR, E_EXEC, "not found",
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EISDIR, ALL, "is a directory",
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/* EMFILE, ALL, "too many open files", */
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ENFILE, ALL, "file table overflow",
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ENOSPC, ALL, "file system full",
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#ifdef EDQUOT
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EDQUOT, ALL, "disk quota exceeded",
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#endif
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#ifdef ENOSR
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ENOSR, ALL, "no streams resources",
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#endif
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ENXIO, ALL, "no such device or address",
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EROFS, ALL, "read-only file system",
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ETXTBSY, ALL, "text busy",
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#ifdef SYSV
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EAGAIN, E_EXEC, "not enough memory",
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#endif
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ENOMEM, ALL, "not enough memory",
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#ifdef ENOLINK
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ENOLINK, ALL, "remote access failed",
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#endif
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#ifdef EMULTIHOP
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EMULTIHOP, ALL, "remote access failed",
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#endif
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#ifdef ECOMM
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ECOMM, ALL, "remote access failed",
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#endif
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#ifdef ESTALE
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ESTALE, ALL, "remote access failed",
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#endif
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#ifdef ETIMEDOUT
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ETIMEDOUT, ALL, "remote access failed",
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#endif
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#ifdef ELOOP
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ELOOP, ALL, "symbolic link loop",
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#endif
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E2BIG, E_EXEC, "argument list too long",
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#ifdef ELIBACC
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ELIBACC, E_EXEC, "shared library missing",
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#endif
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0, 0, NULL
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};
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/*
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* Return a string describing an error. The returned string may be a
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* pointer to a static buffer that will be overwritten on the next call.
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* Action describes the operation that got the error.
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*/
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char *
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errmsg(e, action) {
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struct errname const *ep;
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static char buf[12];
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for (ep = errormsg ; ep->errcode ; ep++) {
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if (ep->errcode == e && (ep->action & action) != 0)
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return ep->msg;
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}
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fmtstr(buf, sizeof buf, "error %d", e);
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return buf;
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}
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