11556Srgrimes/*- 21556Srgrimes * Copyright (c) 1991, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * This code is derived from software contributed to Berkeley by 61556Srgrimes * Kenneth Almquist. 71556Srgrimes * 81556Srgrimes * Redistribution and use in source and binary forms, with or without 91556Srgrimes * modification, are permitted provided that the following conditions 101556Srgrimes * are met: 111556Srgrimes * 1. Redistributions of source code must retain the above copyright 121556Srgrimes * notice, this list of conditions and the following disclaimer. 131556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 141556Srgrimes * notice, this list of conditions and the following disclaimer in the 151556Srgrimes * documentation and/or other materials provided with the distribution. 161556Srgrimes * 4. Neither the name of the University nor the names of its contributors 171556Srgrimes * may be used to endorse or promote products derived from this software 181556Srgrimes * without specific prior written permission. 191556Srgrimes * 201556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 211556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 221556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 231556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 241556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 251556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 261556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 271556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 281556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 291556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 301556Srgrimes * SUCH DAMAGE. 311556Srgrimes */ 321556Srgrimes 331556Srgrimes#ifndef lint 3436150Scharnier#if 0 3536150Scharnierstatic char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95"; 3636150Scharnier#endif 371556Srgrimes#endif /* not lint */ 3899110Sobrien#include <sys/cdefs.h> 3999110Sobrien__FBSDID("$FreeBSD$"); 401556Srgrimes 411556Srgrimes/* 421556Srgrimes * Errors and exceptions. 431556Srgrimes */ 441556Srgrimes 451556Srgrimes#include "shell.h" 461556Srgrimes#include "main.h" 471556Srgrimes#include "options.h" 481556Srgrimes#include "output.h" 491556Srgrimes#include "error.h" 5053891Scracauer#include "nodes.h" /* show.h needs nodes.h */ 5117987Speter#include "show.h" 5238521Scracauer#include "trap.h" 531556Srgrimes#include <signal.h> 5478732Sdd#include <stdlib.h> 5517987Speter#include <unistd.h> 561556Srgrimes#include <errno.h> 571556Srgrimes 581556Srgrimes 591556Srgrimes/* 601556Srgrimes * Code to handle exceptions in C. 611556Srgrimes */ 621556Srgrimes 631556Srgrimesstruct jmploc *handler; 6438521Scracauervolatile sig_atomic_t exception; 6538530Scracauervolatile sig_atomic_t suppressint; 6638521Scracauervolatile sig_atomic_t intpending; 671556Srgrimeschar *commandname; 681556Srgrimes 691556Srgrimes 70213811Sobrienstatic void exverror(int, const char *, va_list) __printf0like(2, 0) __dead2; 7120425Ssteve 721556Srgrimes/* 731556Srgrimes * Called to raise an exception. Since C doesn't include exceptions, we 741556Srgrimes * just do a longjmp to the exception handler. The type of exception is 751556Srgrimes * stored in the global variable "exception". 76199660Sjilles * 77199660Sjilles * Interrupts are disabled; they should be reenabled when the exception is 78199660Sjilles * caught. 791556Srgrimes */ 801556Srgrimes 811556Srgrimesvoid 8290111Simpexraise(int e) 8317987Speter{ 84199660Sjilles INTOFF; 851556Srgrimes if (handler == NULL) 861556Srgrimes abort(); 871556Srgrimes exception = e; 881556Srgrimes longjmp(handler->loc, 1); 891556Srgrimes} 901556Srgrimes 911556Srgrimes 921556Srgrimes/* 931556Srgrimes * Called from trap.c when a SIGINT is received. (If the user specifies 941556Srgrimes * that SIGINT is to be trapped or ignored using the trap builtin, then 9538536Scracauer * this routine is not called.) Suppressint is nonzero when interrupts 9638521Scracauer * are held using the INTOFF macro. If SIGINTs are not suppressed and 9738521Scracauer * the shell is not a root shell, then we want to be terminated if we 9838521Scracauer * get here, as if we were terminated directly by a SIGINT. Arrange for 9938521Scracauer * this here. 1001556Srgrimes */ 1011556Srgrimes 1021556Srgrimesvoid 10390111Simponint(void) 10490111Simp{ 105211281Sjilles sigset_t sigs; 10617987Speter 10738536Scracauer /* 10838536Scracauer * The !in_dotrap here is safe. The only way we can arrive here 10938536Scracauer * with in_dotrap set is that a trap handler set SIGINT to SIG_DFL 11038521Scracauer * and killed itself. 11138521Scracauer */ 11238521Scracauer 11338521Scracauer if (suppressint && !in_dotrap) { 1141556Srgrimes intpending++; 1151556Srgrimes return; 1161556Srgrimes } 1171556Srgrimes intpending = 0; 118211281Sjilles sigemptyset(&sigs); 119211281Sjilles sigprocmask(SIG_SETMASK, &sigs, NULL); 12038521Scracauer 12138536Scracauer /* 12238536Scracauer * This doesn't seem to be needed, since main() emits a newline. 12338536Scracauer */ 12438521Scracauer#if 0 125155301Sschweikh if (tcgetpgrp(0) == getpid()) 12638521Scracauer write(STDERR_FILENO, "\n", 1); 12738521Scracauer#endif 1281556Srgrimes if (rootshell && iflag) 1291556Srgrimes exraise(EXINT); 13038521Scracauer else { 13138521Scracauer signal(SIGINT, SIG_DFL); 13238521Scracauer kill(getpid(), SIGINT); 13338521Scracauer } 1341556Srgrimes} 1351556Srgrimes 1361556Srgrimes 137216622Sjillesstatic void 138216622Sjillesvwarning(const char *msg, va_list ap) 139216622Sjilles{ 140216622Sjilles if (commandname) 141216622Sjilles outfmt(out2, "%s: ", commandname); 142216622Sjilles doformat(out2, msg, ap); 143216622Sjilles out2fmt_flush("\n"); 144216622Sjilles} 145216622Sjilles 146216622Sjilles 147216622Sjillesvoid 148216622Sjilleswarning(const char *msg, ...) 149216622Sjilles{ 150216622Sjilles va_list ap; 151216622Sjilles va_start(ap, msg); 152216622Sjilles vwarning(msg, ap); 153216622Sjilles va_end(ap); 154216622Sjilles} 155216622Sjilles 156216622Sjilles 1571556Srgrimes/* 15820425Ssteve * Exverror is called to raise the error exception. If the first argument 1591556Srgrimes * is not NULL then error prints an error message using printf style 1601556Srgrimes * formatting. It then raises the error exception. 1611556Srgrimes */ 162213811Sobrienstatic void 16390111Simpexverror(int cond, const char *msg, va_list ap) 16420425Ssteve{ 165199660Sjilles /* 166199660Sjilles * An interrupt trumps an error. Certain places catch error 167199660Sjilles * exceptions or transform them to a plain nonzero exit code 168199660Sjilles * in child processes, and if an error exception can be handled, 169199660Sjilles * an interrupt can be handled as well. 170199660Sjilles * 171199660Sjilles * exraise() will disable interrupts for the exception handler. 172199660Sjilles */ 173199660Sjilles FORCEINTON; 1741556Srgrimes 17520425Ssteve#ifdef DEBUG 17620425Ssteve if (msg) 17720425Ssteve TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid())); 17820425Ssteve else 17920425Ssteve TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); 18020425Ssteve#endif 181216622Sjilles if (msg) 182216622Sjilles vwarning(msg, ap); 18320425Ssteve flushall(); 18420425Ssteve exraise(cond); 18520425Ssteve} 18620425Ssteve 18720425Ssteve 1881556Srgrimesvoid 18975577Skriserror(const char *msg, ...) 19017987Speter{ 1911556Srgrimes va_list ap; 19220425Ssteve va_start(ap, msg); 19320425Ssteve exverror(EXERROR, msg, ap); 19420425Ssteve va_end(ap); 19520425Ssteve} 19617987Speter 19720425Ssteve 19820425Sstevevoid 19975577Skrisexerror(int cond, const char *msg, ...) 20020425Ssteve{ 20120425Ssteve va_list ap; 2021556Srgrimes va_start(ap, msg); 20320425Ssteve exverror(cond, msg, ap); 2041556Srgrimes va_end(ap); 2051556Srgrimes} 206