error.c revision dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0 
1/*	$NetBSD: error.c,v 1.31 2003/08/07 09:05:30 agc Exp $	*/
2
3/*-
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)error.c	8.2 (Berkeley) 5/4/95";
39#else
40__RCSID("$NetBSD: error.c,v 1.31 2003/08/07 09:05:30 agc Exp $");
41#endif
42#endif /* not lint */
43
44/*
45 * Errors and exceptions.
46 */
47
48#include <signal.h>
49#include <stdlib.h>
50#include <unistd.h>
51#include <errno.h>
52#include <stdio.h>
53#include <string.h>
54
55#include "shell.h"
56#include "main.h"
57#include "options.h"
58#include "output.h"
59#include "error.h"
60#include "show.h"
61
62#define signal bsd_signal
63/*
64 * Code to handle exceptions in C.
65 */
66
67struct jmploc *handler;
68int exception;
69volatile int suppressint;
70volatile int intpending;
71char *commandname;
72
73
74static void exverror(int, const char *, va_list)
75    __attribute__((__noreturn__));
76
77/*
78 * Called to raise an exception.  Since C doesn't include exceptions, we
79 * just do a longjmp to the exception handler.  The type of exception is
80 * stored in the global variable "exception".
81 */
82
83void
84exraise(int e)
85{
86	if (handler == NULL)
87		abort();
88	exception = e;
89	longjmp(handler->loc, 1);
90}
91
92
93/*
94 * Called from trap.c when a SIGINT is received.  (If the user specifies
95 * that SIGINT is to be trapped or ignored using the trap builtin, then
96 * this routine is not called.)  Suppressint is nonzero when interrupts
97 * are held using the INTOFF macro.  The call to _exit is necessary because
98 * there is a short period after a fork before the signal handlers are
99 * set to the appropriate value for the child.  (The test for iflag is
100 * just defensive programming.)
101 */
102
103void
104onint(void)
105{
106	sigset_t nsigset;
107
108	if (suppressint) {
109		intpending = 1;
110		return;
111	}
112	intpending = 0;
113	sigemptyset(&nsigset);
114	sigprocmask(SIG_SETMASK, &nsigset, NULL);
115	if (rootshell && iflag)
116		exraise(EXINT);
117	else {
118		signal(SIGINT, SIG_DFL);
119		raise(SIGINT);
120	}
121	/* NOTREACHED */
122}
123
124static void
125exvwarning(int sv_errno, const char *msg, va_list ap)
126{
127	/* Partially emulate line buffered output so that:
128	 *	printf '%d\n' 1 a 2
129	 * and
130	 *	printf '%d %d %d\n' 1 a 2
131	 * both generate sensible text when stdout and stderr are merged.
132	 */
133	if (output.nextc != output.buf && output.nextc[-1] == '\n')
134		flushout(&output);
135	if (commandname)
136		outfmt(&errout, "%s: ", commandname);
137	if (msg != NULL) {
138		doformat(&errout, msg, ap);
139		if (sv_errno >= 0)
140			outfmt(&errout, ": ");
141	}
142	if (sv_errno >= 0)
143		outfmt(&errout, "%s", strerror(sv_errno));
144	out2c('\n');
145	flushout(&errout);
146}
147
148/*
149 * Exverror is called to raise the error exception.  If the second argument
150 * is not NULL then error prints an error message using printf style
151 * formatting.  It then raises the error exception.
152 */
153static void
154exverror(int cond, const char *msg, va_list ap)
155{
156	CLEAR_PENDING_INT;
157	INTOFF;
158
159#ifdef DEBUG
160	if (msg) {
161		TRACE(("exverror(%d, \"", cond));
162		TRACEV((msg, ap));
163		TRACE(("\") pid=%d\n", getpid()));
164	} else
165		TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
166#endif
167	if (msg)
168		exvwarning(-1, msg, ap);
169
170	flushall();
171	exraise(cond);
172	/* NOTREACHED */
173}
174
175
176void
177error(const char *msg, ...)
178{
179	va_list ap;
180
181	va_start(ap, msg);
182	exverror(EXERROR, msg, ap);
183	/* NOTREACHED */
184	va_end(ap);
185}
186
187
188void
189exerror(int cond, const char *msg, ...)
190{
191	va_list ap;
192
193	va_start(ap, msg);
194	exverror(cond, msg, ap);
195	/* NOTREACHED */
196	va_end(ap);
197}
198
199/*
200 * error/warning routines for external builtins
201 */
202
203void
204sh_exit(int rval)
205{
206	exerrno = rval & 255;
207	exraise(EXEXEC);
208}
209
210void
211sh_err(int status, const char *fmt, ...)
212{
213	va_list ap;
214
215	va_start(ap, fmt);
216	exvwarning(errno, fmt, ap);
217	va_end(ap);
218	sh_exit(status);
219}
220
221void
222sh_verr(int status, const char *fmt, va_list ap)
223{
224	exvwarning(errno, fmt, ap);
225	sh_exit(status);
226}
227
228void
229sh_errx(int status, const char *fmt, ...)
230{
231	va_list ap;
232
233	va_start(ap, fmt);
234	exvwarning(-1, fmt, ap);
235	va_end(ap);
236	sh_exit(status);
237}
238
239void
240sh_verrx(int status, const char *fmt, va_list ap)
241{
242	exvwarning(-1, fmt, ap);
243	sh_exit(status);
244}
245
246void
247sh_warn(const char *fmt, ...)
248{
249	va_list ap;
250
251	va_start(ap, fmt);
252	exvwarning(errno, fmt, ap);
253	va_end(ap);
254}
255
256void
257sh_vwarn(const char *fmt, va_list ap)
258{
259	exvwarning(errno, fmt, ap);
260}
261
262void
263sh_warnx(const char *fmt, ...)
264{
265	va_list ap;
266
267	va_start(ap, fmt);
268	exvwarning(-1, fmt, ap);
269	va_end(ap);
270}
271
272void
273sh_vwarnx(const char *fmt, va_list ap)
274{
275	exvwarning(-1, fmt, ap);
276}
277
278
279/*
280 * Table of error messages.
281 */
282
283struct errname {
284	short errcode;		/* error number */
285	short action;		/* operation which encountered the error */
286	const char *msg;	/* text describing the error */
287};
288
289
290#define ALL (E_OPEN|E_CREAT|E_EXEC)
291
292STATIC const struct errname errormsg[] = {
293	{ EINTR,	ALL,	"interrupted" },
294	{ EACCES,	ALL,	"permission denied" },
295	{ EIO,		ALL,	"I/O error" },
296	{ EEXIST,	ALL,	"file exists" },
297	{ ENOENT,	E_OPEN,	"no such file" },
298	{ ENOENT,	E_CREAT,"directory nonexistent" },
299	{ ENOENT,	E_EXEC,	"not found" },
300	{ ENOTDIR,	E_OPEN,	"no such file" },
301	{ ENOTDIR,	E_CREAT,"directory nonexistent" },
302	{ ENOTDIR,	E_EXEC,	"not found" },
303	{ EISDIR,	ALL,	"is a directory" },
304#ifdef EMFILE
305	{ EMFILE,	ALL,	"too many open files" },
306#endif
307	{ ENFILE,	ALL,	"file table overflow" },
308	{ ENOSPC,	ALL,	"file system full" },
309#ifdef EDQUOT
310	{ EDQUOT,	ALL,	"disk quota exceeded" },
311#endif
312#ifdef ENOSR
313	{ ENOSR,	ALL,	"no streams resources" },
314#endif
315	{ ENXIO,	ALL,	"no such device or address" },
316	{ EROFS,	ALL,	"read-only file system" },
317	{ ETXTBSY,	ALL,	"text busy" },
318#ifdef EAGAIN
319	{ EAGAIN,	E_EXEC,	"not enough memory" },
320#endif
321	{ ENOMEM,	ALL,	"not enough memory" },
322#ifdef ENOLINK
323	{ ENOLINK,	ALL,	"remote access failed" },
324#endif
325#ifdef EMULTIHOP
326	{ EMULTIHOP,	ALL,	"remote access failed" },
327#endif
328#ifdef ECOMM
329	{ ECOMM,	ALL,	"remote access failed" },
330#endif
331#ifdef ESTALE
332	{ ESTALE,	ALL,	"remote access failed" },
333#endif
334#ifdef ETIMEDOUT
335	{ ETIMEDOUT,	ALL,	"remote access failed" },
336#endif
337#ifdef ELOOP
338	{ ELOOP,	ALL,	"symbolic link loop" },
339#endif
340	{ E2BIG,	E_EXEC,	"argument list too long" },
341#ifdef ELIBACC
342	{ ELIBACC,	E_EXEC,	"shared library missing" },
343#endif
344	{ 0,		0,	NULL },
345};
346
347
348/*
349 * Return a string describing an error.  The returned string may be a
350 * pointer to a static buffer that will be overwritten on the next call.
351 * Action describes the operation that got the error.
352 */
353
354const char *
355errmsg(int e, int action)
356{
357	struct errname const *ep;
358	static char buf[12];
359
360	for (ep = errormsg ; ep->errcode ; ep++) {
361		if (ep->errcode == e && (ep->action & action) != 0)
362			return ep->msg;
363	}
364	fmtstr(buf, sizeof buf, "error %d", e);
365	return buf;
366}
367