/*- * 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. 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. * * @(#)error.c 8.2 (Berkeley) 5/4/95 * $FreeBSD: src/bin/sh/error.c,v 1.15.2.4 2002/08/27 01:36:28 tjr Exp $ * $DragonFly: src/bin/sh/error.c,v 1.3 2004/03/19 18:39:41 cpressey Exp $ */ /* * Errors and exceptions. */ #include "shell.h" #include "main.h" #include "options.h" #include "output.h" #include "error.h" #include "eval.h" /* defines commandname */ #include "nodes.h" /* show.h needs nodes.h */ #include "show.h" #include "trap.h" #include #include #include #include /* * Code to handle exceptions in C. */ struct jmploc *handler; volatile sig_atomic_t exception; volatile sig_atomic_t suppressint; volatile sig_atomic_t intpending; static void exverror(int, const char *, va_list) __printf0like(2, 0); /* * 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. If SIGINTs are not suppressed and * the shell is not a root shell, then we want to be terminated if we * get here, as if we were terminated directly by a SIGINT. Arrange for * this here. */ void onint(void) { sigset_t sigset; /* * The !in_dotrap here is safe. The only way we can arrive here * with in_dotrap set is that a trap handler set SIGINT to SIG_DFL * and killed itself. */ if (suppressint && !in_dotrap) { intpending++; return; } intpending = 0; sigemptyset(&sigset); sigprocmask(SIG_SETMASK, &sigset, NULL); /* * This doesn't seem to be needed, since main() emits a newline. */ #if 0 if (tcgetpgrp(0) == getpid()) write(STDERR_FILENO, "\n", 1); #endif if (rootshell && iflag) exraise(EXINT); else { signal(SIGINT, SIG_DFL); kill(getpid(), SIGINT); } } /* * Exverror 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. */ static void exverror(int cond, const char *msg, va_list ap) { CLEAR_PENDING_INT; INTOFF; #ifdef DEBUG if (msg) TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); else TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); #endif if (msg) { if (commandname) outfmt(&errout, "%s: ", commandname); doformat(&errout, msg, ap); out2c('\n'); } flushall(); exraise(cond); } void error(const char *msg, ...) { va_list ap; va_start(ap, msg); exverror(EXERROR, msg, ap); va_end(ap); } void exerror(int cond, const char *msg, ...) { va_list ap; va_start(ap, msg); exverror(cond, msg, ap); va_end(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" }, { 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 notdef { 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" }, { 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 { EEXIST, E_CREAT, "file exists" }, { 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; }