/* $NetBSD: error.c,v 1.33 2006/10/04 15:00:38 christos 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 #ifndef lint #if 0 static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; #else __RCSID("$NetBSD: error.c,v 1.33 2006/10/04 15:00:38 christos Exp $"); #endif #endif /* not lint */ /* * Errors and exceptions. */ #include #include #include #include #include #include #include "shell.h" #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; char *commandname; static void exverror(int, const char *, va_list) __attribute__((__noreturn__)); /* * 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; }