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Diffstat (limited to 'bin/cash/error.c')
| -rw-r--r-- | bin/cash/error.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/bin/cash/error.c b/bin/cash/error.c new file mode 100644 index 00000000..02680718 --- /dev/null +++ b/bin/cash/error.c @@ -0,0 +1,199 @@ +/*- + * 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. + */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; +#endif +#endif /* not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD: releng/12.0/bin/sh/error.c 314436 2017-02-28 23:42:47Z imp $"); + +/* + * Errors and exceptions. + */ + +#include "shell.h" +#include "eval.h" +#include "main.h" +#include "options.h" +#include "output.h" +#include "error.h" +#include "nodes.h" /* show.h needs nodes.h */ +#include "show.h" +#include "trap.h" +#include <signal.h> +#include <stdlib.h> +#include <unistd.h> +#include <errno.h> + + +/* + * 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) __dead2; + +/* + * 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". + * + * Interrupts are disabled; they should be reenabled when the exception is + * caught. + */ + +void +exraise(int e) +{ + INTOFF; + if (handler == NULL) + abort(); + exception = e; + longjmp(handler->loc, 1); +} + + +/* + * Called from trap.c when a SIGINT is received and not suppressed, or when + * an interrupt is pending and interrupts are re-enabled using INTON. + * (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 sigs; + + intpending = 0; + sigemptyset(&sigs); + sigprocmask(SIG_SETMASK, &sigs, 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); + _exit(128 + SIGINT); + } +} + + +static void +vwarning(const char *msg, va_list ap) +{ + if (commandname) + outfmt(out2, "%s: ", commandname); + else if (arg0) + outfmt(out2, "%s: ", arg0); + doformat(out2, msg, ap); + out2fmt_flush("\n"); +} + + +void +warning(const char *msg, ...) +{ + va_list ap; + va_start(ap, msg); + vwarning(msg, ap); + va_end(ap); +} + + +/* + * 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) +{ + /* + * An interrupt trumps an error. Certain places catch error + * exceptions or transform them to a plain nonzero exit code + * in child processes, and if an error exception can be handled, + * an interrupt can be handled as well. + * + * exraise() will disable interrupts for the exception handler. + */ + FORCEINTON; + +#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) + vwarning(msg, ap); + 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); +} |