error.c revision 21673 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	$FreeBSD: head/bin/sh/error.c 21673 1997-01-14 07:20:47Z jkh $
37 */
38
39#ifndef lint
40static char const sccsid[] = "@(#)error.c	8.2 (Berkeley) 5/4/95";
41#endif /* not lint */
42
43/*
44 * Errors and exceptions.
45 */
46
47#include "shell.h"
48#include "main.h"
49#include "options.h"
50#include "output.h"
51#include "error.h"
52#include "show.h"
53#include <signal.h>
54#include <unistd.h>
55#include <errno.h>
56
57
58/*
59 * Code to handle exceptions in C.
60 */
61
62struct jmploc *handler;
63int exception;
64volatile int suppressint;
65volatile int intpending;
66char *commandname;
67
68
69static void exverror __P((int, char *, va_list));
70
71/*
72 * Called to raise an exception.  Since C doesn't include exceptions, we
73 * just do a longjmp to the exception handler.  The type of exception is
74 * stored in the global variable "exception".
75 */
76
77void
78exraise(e)
79	int e;
80{
81	if (handler == NULL)
82		abort();
83	exception = e;
84	longjmp(handler->loc, 1);
85}
86
87
88/*
89 * Called from trap.c when a SIGINT is received.  (If the user specifies
90 * that SIGINT is to be trapped or ignored using the trap builtin, then
91 * this routine is not called.)  Suppressint is nonzero when interrupts
92 * are held using the INTOFF macro.  The call to _exit is necessary because
93 * there is a short period after a fork before the signal handlers are
94 * set to the appropriate value for the child.  (The test for iflag is
95 * just defensive programming.)
96 */
97
98void
99onint() {
100	sigset_t sigset;
101
102	if (suppressint) {
103		intpending++;
104		return;
105	}
106	intpending = 0;
107	sigemptyset(&sigset);
108	sigprocmask(SIG_SETMASK, &sigset, NULL);
109	out2str("\n");
110	if (rootshell && iflag)
111		exraise(EXINT);
112	else
113		_exit(128 + SIGINT);
114}
115
116
117/*
118 * Exverror is called to raise the error exception.  If the first argument
119 * is not NULL then error prints an error message using printf style
120 * formatting.  It then raises the error exception.
121 */
122static void
123exverror(cond, msg, ap)
124	int cond;
125	char *msg;
126	va_list ap;
127{
128	CLEAR_PENDING_INT;
129	INTOFF;
130
131#ifdef DEBUG
132	if (msg)
133		TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
134	else
135		TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
136#endif
137	if (msg) {
138		if (commandname)
139			outfmt(&errout, "%s: ", commandname);
140		doformat(&errout, msg, ap);
141		out2c('\n');
142	}
143	flushall();
144	exraise(cond);
145}
146
147
148#if __STDC__
149void
150error(char *msg, ...)
151#else
152void
153error(va_alist)
154	va_dcl
155#endif
156{
157#if !__STDC__
158	char *msg;
159#endif
160	va_list ap;
161#if __STDC__
162	va_start(ap, msg);
163#else
164	va_start(ap);
165	msg = va_arg(ap, char *);
166#endif
167	exverror(EXERROR, msg, ap);
168	va_end(ap);
169}
170
171
172#if __STDC__
173void
174exerror(int cond, char *msg, ...)
175#else
176void
177exerror(va_alist)
178	va_dcl
179#endif
180{
181#if !__STDC__
182	int cond;
183	char *msg;
184#endif
185	va_list ap;
186#if __STDC__
187	va_start(ap, msg);
188#else
189	va_start(ap);
190	cond = va_arg(ap, int);
191	msg = va_arg(ap, char *);
192#endif
193	exverror(cond, msg, ap);
194	va_end(ap);
195}
196
197
198
199/*
200 * Table of error messages.
201 */
202
203struct errname {
204	short errcode;		/* error number */
205	short action;		/* operation which encountered the error */
206	char *msg;		/* text describing the error */
207};
208
209
210#define ALL (E_OPEN|E_CREAT|E_EXEC)
211
212STATIC const struct errname errormsg[] = {
213	{ EINTR,	ALL,	"interrupted" },
214	{ EACCES,	ALL,	"permission denied" },
215	{ EIO,		ALL,	"I/O error" },
216	{ ENOENT,	E_OPEN,	"no such file" },
217	{ ENOENT,	E_CREAT,"directory nonexistent" },
218	{ ENOENT,	E_EXEC,	"not found" },
219	{ ENOTDIR,	E_OPEN,	"no such file" },
220	{ ENOTDIR,	E_CREAT,"directory nonexistent" },
221	{ ENOTDIR,	E_EXEC,	"not found" },
222	{ EISDIR,	ALL,	"is a directory" },
223#ifdef notdef
224	{ EMFILE,	ALL,	"too many open files" },
225#endif
226	{ ENFILE,	ALL,	"file table overflow" },
227	{ ENOSPC,	ALL,	"file system full" },
228#ifdef EDQUOT
229	{ EDQUOT,	ALL,	"disk quota exceeded" },
230#endif
231#ifdef ENOSR
232	{ ENOSR,	ALL,	"no streams resources" },
233#endif
234	{ ENXIO,	ALL,	"no such device or address" },
235	{ EROFS,	ALL,	"read-only file system" },
236	{ ETXTBSY,	ALL,	"text busy" },
237#ifdef SYSV
238	{ EAGAIN,	E_EXEC,	"not enough memory" },
239#endif
240	{ ENOMEM,	ALL,	"not enough memory" },
241#ifdef ENOLINK
242	{ ENOLINK,	ALL,	"remote access failed" },
243#endif
244#ifdef EMULTIHOP
245	{ EMULTIHOP,	ALL,	"remote access failed" },
246#endif
247#ifdef ECOMM
248	{ ECOMM,	ALL,	"remote access failed" },
249#endif
250#ifdef ESTALE
251	{ ESTALE,	ALL,	"remote access failed" },
252#endif
253#ifdef ETIMEDOUT
254	{ ETIMEDOUT,	ALL,	"remote access failed" },
255#endif
256#ifdef ELOOP
257	{ ELOOP,	ALL,	"symbolic link loop" },
258#endif
259	{ E2BIG,	E_EXEC,	"argument list too long" },
260#ifdef ELIBACC
261	{ ELIBACC,	E_EXEC,	"shared library missing" },
262#endif
263	{ 0,		0,	NULL },
264};
265
266
267/*
268 * Return a string describing an error.  The returned string may be a
269 * pointer to a static buffer that will be overwritten on the next call.
270 * Action describes the operation that got the error.
271 */
272
273char *
274errmsg(e, action)
275	int e;
276	int action;
277{
278	struct errname const *ep;
279	static char buf[12];
280
281	for (ep = errormsg ; ep->errcode ; ep++) {
282		if (ep->errcode == e && (ep->action & action) != 0)
283			return ep->msg;
284	}
285	fmtstr(buf, sizeof buf, "error %d", e);
286	return buf;
287}
288