--- /dev/null
+/*-
+ * 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.
+ * 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
+#if 0
+static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95";
+#endif
+#endif /* not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * 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);
+}
projects / apple / shell_cmds.git / blobdiff