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Diffstat (limited to 'bin/sh/error.c')
| -rw-r--r-- | bin/sh/error.c | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/bin/sh/error.c b/bin/sh/error.c new file mode 100644 index 0000000..b6853b6 --- /dev/null +++ b/bin/sh/error.c @@ -0,0 +1,249 @@ +/*- + * 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. + */ + +#ifndef lint +static char sccsid[] = "@(#)error.c 8.1 (Berkeley) 5/31/93"; +#endif /* not lint */ + +/* + * Errors and exceptions. + */ + +#include "shell.h" +#include "main.h" +#include "options.h" +#include "output.h" +#include "error.h" +#include <signal.h> +#ifdef __STDC__ +#include "stdarg.h" +#else +#include <varargs.h> +#endif +#include <errno.h> + + +/* + * Code to handle exceptions in C. + */ + +struct jmploc *handler; +int exception; +volatile int suppressint; +volatile int intpending; +char *commandname; + + +/* + * 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(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() { + if (suppressint) { + intpending++; + return; + } + intpending = 0; +#ifdef BSD + sigsetmask(0); +#endif + if (rootshell && iflag) + exraise(EXINT); + else + _exit(128 + SIGINT); +} + + + +void +error2(a, b) + char *a, *b; + { + error("%s: %s", a, b); +} + + +/* + * Error 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. + */ + +#ifdef __STDC__ +void +error(char *msg, ...) { +#else +void +error(va_alist) + va_dcl + { + char *msg; +#endif + va_list ap; + + CLEAR_PENDING_INT; + INTOFF; +#ifdef __STDC__ + va_start(ap, msg); +#else + va_start(ap); + msg = va_arg(ap, char *); +#endif +#ifdef DEBUG + if (msg) + TRACE(("error(\"%s\") pid=%d\n", msg, getpid())); + else + TRACE(("error(NULL) pid=%d\n", getpid())); +#endif + if (msg) { + if (commandname) + outfmt(&errout, "%s: ", commandname); + doformat(&errout, msg, ap); + out2c('\n'); + } + va_end(ap); + flushall(); + exraise(EXERROR); +} + + + +/* + * Table of error messages. + */ + +struct errname { + short errcode; /* error number */ + short action; /* operation which encountered the error */ + 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", +/* EMFILE, ALL, "too many open files", */ + 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 SYSV + 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 + 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. + */ + +char * +errmsg(e, 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; +} |
