NetBSD-5.0.2/bin/sh/error.c
/* $NetBSD: error.c,v 1.37 2008/10/16 14:36:40 dholland Exp $ */
/*-
* Copyright (c) 1991, 1993
* 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: error.c,v 1.37 2008/10/16 14:36:40 dholland Exp $");
#endif
#endif /* not lint */
/*
* Errors and exceptions.
*/
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include "shell.h"
#include "eval.h" /* for commandname */
#include "main.h"
#include "options.h"
#include "output.h"
#include "error.h"
#include "show.h"
/*
* Code to handle exceptions in C.
*/
struct jmploc *handler;
int exception;
volatile int suppressint;
volatile int intpending;
static void exverror(int, const char *, va_list) __dead;
/*
* 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(int 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(void)
{
sigset_t nsigset;
if (suppressint) {
intpending = 1;
return;
}
intpending = 0;
sigemptyset(&nsigset);
sigprocmask(SIG_SETMASK, &nsigset, NULL);
if (rootshell && iflag)
exraise(EXINT);
else {
signal(SIGINT, SIG_DFL);
raise(SIGINT);
}
/* NOTREACHED */
}
static void
exvwarning(int sv_errno, const char *msg, va_list ap)
{
/* Partially emulate line buffered output so that:
* printf '%d\n' 1 a 2
* and
* printf '%d %d %d\n' 1 a 2
* both generate sensible text when stdout and stderr are merged.
*/
if (output.nextc != output.buf && output.nextc[-1] == '\n')
flushout(&output);
if (commandname)
outfmt(&errout, "%s: ", commandname);
else
outfmt(&errout, "%s: ", getprogname());
if (msg != NULL) {
doformat(&errout, msg, ap);
if (sv_errno >= 0)
outfmt(&errout, ": ");
}
if (sv_errno >= 0)
outfmt(&errout, "%s", strerror(sv_errno));
out2c('\n');
flushout(&errout);
}
/*
* Exverror is called to raise the error exception. If the second argument
* is not NULL then error prints an error message using printf style
* formatting. It then raises the error exception.
*/
static void
exverror(int cond, const char *msg, va_list ap)
{
CLEAR_PENDING_INT;
INTOFF;
#ifdef DEBUG
if (msg) {
TRACE(("exverror(%d, \"", cond));
TRACEV((msg, ap));
TRACE(("\") pid=%d\n", getpid()));
} else
TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
#endif
if (msg)
exvwarning(-1, msg, ap);
flushall();
exraise(cond);
/* NOTREACHED */
}
void
error(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
exverror(EXERROR, msg, ap);
/* NOTREACHED */
va_end(ap);
}
void
exerror(int cond, const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
exverror(cond, msg, ap);
/* NOTREACHED */
va_end(ap);
}
/*
* error/warning routines for external builtins
*/
void
sh_exit(int rval)
{
exerrno = rval & 255;
exraise(EXEXEC);
}
void
sh_err(int status, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
exvwarning(errno, fmt, ap);
va_end(ap);
sh_exit(status);
}
void
sh_verr(int status, const char *fmt, va_list ap)
{
exvwarning(errno, fmt, ap);
sh_exit(status);
}
void
sh_errx(int status, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
exvwarning(-1, fmt, ap);
va_end(ap);
sh_exit(status);
}
void
sh_verrx(int status, const char *fmt, va_list ap)
{
exvwarning(-1, fmt, ap);
sh_exit(status);
}
void
sh_warn(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
exvwarning(errno, fmt, ap);
va_end(ap);
}
void
sh_vwarn(const char *fmt, va_list ap)
{
exvwarning(errno, fmt, ap);
}
void
sh_warnx(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
exvwarning(-1, fmt, ap);
va_end(ap);
}
void
sh_vwarnx(const char *fmt, va_list ap)
{
exvwarning(-1, fmt, ap);
}
/*
* Table of error messages.
*/
struct errname {
short errcode; /* error number */
short action; /* operation which encountered the error */
const 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" },
{ EEXIST, ALL, "file exists" },
{ 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" },
#ifdef EMFILE
{ EMFILE, ALL, "too many open files" },
#endif
{ 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 EAGAIN
{ 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
#ifdef ENAMETOOLONG
{ ENAMETOOLONG, ALL, "file name too long" },
#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.
*/
const char *
errmsg(int e, int 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;
}