1359 lines
32 KiB
C
1359 lines
32 KiB
C
/* $NetBSD: csh.c,v 1.34 2003/08/07 09:05:04 agc Exp $ */
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/*-
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* Copyright (c) 1980, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)csh.c 8.2 (Berkeley) 10/12/93";
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#else
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__RCSID("$NetBSD: csh.c,v 1.34 2003/08/07 09:05:04 agc Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <locale.h>
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#include <paths.h> /* should this be included in pathnames.h instead? */
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#include <pwd.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <vis.h>
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#include "csh.h"
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#include "extern.h"
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#include "pathnames.h"
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#include "proc.h"
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/*
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* C Shell
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*
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* Bill Joy, UC Berkeley, California, USA
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* October 1978, May 1980
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*
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* Jim Kulp, IIASA, Laxenburg, Austria
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* April 1980
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*
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* Christos Zoulas, Cornell University
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* June, 1991
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*/
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Char *dumphist[] = {STRhistory, STRmh, 0, 0};
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Char *loadhist[] = {STRsource, STRmh, STRtildothist, 0};
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int nofile = 0;
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bool batch = 0;
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bool enterhist = 0;
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bool fast = 0;
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bool mflag = 0;
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bool nexececho = 0;
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bool nverbose = 0;
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bool prompt = 1;
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bool quitit = 0;
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bool reenter = 0;
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extern char **environ;
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static int readf(void *, char *, int);
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static fpos_t seekf(void *, fpos_t, int);
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static int writef(void *, const char *, int);
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static int closef(void *);
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static int srccat(Char *, Char *);
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static int srcfile(char *, bool, bool);
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static void phup(int);
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static void srcunit(int, bool, bool);
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static void mailchk(void);
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#ifndef _PATH_DEFPATH
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static Char **defaultpath(void);
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#endif
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int main(int, char *[]);
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int
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main(int argc, char *argv[])
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{
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struct sigaction oact;
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Char *cp;
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char *tcp, **tempv;
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const char *ecp;
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sigset_t nsigset;
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int f;
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cshin = stdin;
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cshout = stdout;
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csherr = stderr;
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setprogname(argv[0]);
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settimes(); /* Immed. estab. timing base */
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/*
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* Initialize non constant strings
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*/
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#ifdef _PATH_BSHELL
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STR_BSHELL = SAVE(_PATH_BSHELL);
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#endif
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#ifdef _PATH_CSHELL
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STR_SHELLPATH = SAVE(_PATH_CSHELL);
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#endif
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STR_environ = blk2short(environ);
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environ = short2blk(STR_environ); /* So that we can free it */
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STR_WORD_CHARS = SAVE(WORD_CHARS);
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HIST = '!';
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HISTSUB = '^';
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word_chars = STR_WORD_CHARS;
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tempv = argv;
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if (eq(str2short(tempv[0]), STRaout)) /* A.out's are quittable */
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quitit = 1;
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uid = getuid();
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gid = getgid();
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euid = geteuid();
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egid = getegid();
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/*
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* We are a login shell if: 1. we were invoked as -<something> and we had
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* no arguments 2. or we were invoked only with the -l flag
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*/
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loginsh = (**tempv == '-' && argc == 1) ||
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(argc == 2 && tempv[1][0] == '-' && tempv[1][1] == 'l' &&
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tempv[1][2] == '\0');
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if (loginsh && **tempv != '-') {
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/*
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* Mangle the argv space
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*/
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tempv[1][0] = '\0';
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tempv[1][1] = '\0';
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tempv[1] = NULL;
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for (tcp = *tempv; *tcp++;)
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continue;
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for (tcp--; tcp >= *tempv; tcp--)
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tcp[1] = tcp[0];
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*++tcp = '-';
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argc--;
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}
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if (loginsh)
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(void)time(&chktim);
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AsciiOnly = 1;
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#ifdef NLS
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(void)setlocale(LC_ALL, "");
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{
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int k;
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for (k = 0200; k <= 0377 && !Isprint(k); k++)
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continue;
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AsciiOnly = k > 0377;
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}
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#else
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AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL;
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#endif /* NLS */
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/*
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* Move the descriptors to safe places. The variable didfds is 0 while we
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* have only FSH* to work with. When didfds is true, we have 0,1,2 and
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* prefer to use these.
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*/
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initdesc();
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/*
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* XXX: This is to keep programs that use stdio happy.
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* what we really want is freunopen() ....
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* Closing cshin cshout and csherr (which are really stdin stdout
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* and stderr at this point and then reopening them in the same order
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* gives us again stdin == cshin stdout == cshout and stderr == csherr.
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* If that was not the case builtins like printf that use stdio
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* would break. But in any case we could fix that with memcpy and
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* a bit of pointer manipulation...
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* Fortunately this is not needed under the current implementation
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* of stdio.
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*/
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(void)fclose(cshin);
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(void)fclose(cshout);
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(void)fclose(csherr);
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if (!(cshin = funopen((void *) &SHIN, readf, writef, seekf, closef)))
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exit(1);
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if (!(cshout = funopen((void *) &SHOUT, readf, writef, seekf, closef)))
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exit(1);
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if (!(csherr = funopen((void *) &SHERR, readf, writef, seekf, closef)))
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exit(1);
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(void)setvbuf(cshin, NULL, _IOLBF, 0);
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(void)setvbuf(cshout, NULL, _IOLBF, 0);
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(void)setvbuf(csherr, NULL, _IOLBF, 0);
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/*
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* Initialize the shell variables. ARGV and PROMPT are initialized later.
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* STATUS is also munged in several places. CHILD is munged when
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* forking/waiting
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*/
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set(STRstatus, Strsave(STR0));
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if ((ecp = getenv("HOME")) != NULL)
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cp = quote(SAVE(ecp));
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else
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cp = NULL;
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if (cp == NULL)
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fast = 1; /* No home -> can't read scripts */
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else
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set(STRhome, cp);
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dinit(cp); /* dinit thinks that HOME == cwd in a login
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* shell */
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/*
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* Grab other useful things from the environment. Should we grab
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* everything??
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*/
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if ((ecp = getenv("LOGNAME")) != NULL ||
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(ecp = getenv("USER")) != NULL)
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set(STRuser, quote(SAVE(ecp)));
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if ((ecp = getenv("TERM")) != NULL)
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set(STRterm, quote(SAVE(ecp)));
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/*
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* Re-initialize path if set in environment
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*/
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if ((ecp = getenv("PATH")) == NULL) {
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#ifdef _PATH_DEFPATH
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importpath(str2short(_PATH_DEFPATH));
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#else
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setq(STRpath, defaultpath(), &shvhed);
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#endif
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} else {
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importpath(str2short(ecp));
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}
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set(STRshell, Strsave(STR_SHELLPATH));
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doldol = putn((int) getpid()); /* For $$ */
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shtemp = Strspl(STRtmpsh, doldol); /* For << */
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/*
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* Record the interrupt states from the parent process. If the parent is
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* non-interruptible our hand must be forced or we (and our children) won't
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* be either. Our children inherit termination from our parent. We catch it
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* only if we are the login shell.
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*/
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/* parents interruptibility */
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(void)sigaction(SIGINT, NULL, &oact);
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parintr = oact.sa_handler;
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(void)sigaction(SIGTERM, NULL, &oact);
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parterm = oact.sa_handler;
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/* catch these all, login shell or not */
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(void)signal(SIGHUP, phup); /* exit processing on HUP */
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(void)signal(SIGXCPU, phup); /* ...and on XCPU */
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(void)signal(SIGXFSZ, phup); /* ...and on XFSZ */
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/*
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* Process the arguments.
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*
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* Note that processing of -v/-x is actually delayed till after script
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* processing.
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*
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* We set the first character of our name to be '-' if we are a shell
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* running interruptible commands. Many programs which examine ps'es
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* use this to filter such shells out.
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*/
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argc--, tempv++;
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while (argc > 0 && (tcp = tempv[0])[0] == '-' && *++tcp != '\0' && !batch) {
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do
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switch (*tcp++) {
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case 0: /* - Interruptible, no prompt */
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prompt = 0;
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setintr = 1;
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nofile = 1;
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break;
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case 'b': /* -b Next arg is input file */
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batch = 1;
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break;
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case 'c': /* -c Command input from arg */
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if (argc == 1)
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xexit(0);
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argc--, tempv++;
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arginp = SAVE(tempv[0]);
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prompt = 0;
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nofile = 1;
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break;
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case 'e': /* -e Exit on any error */
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exiterr = 1;
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break;
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case 'f': /* -f Fast start */
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fast = 1;
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break;
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case 'i': /* -i Interactive, even if !intty */
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intact = 1;
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nofile = 1;
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break;
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case 'm': /* -m read .cshrc (from su) */
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mflag = 1;
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break;
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case 'n': /* -n Don't execute */
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noexec = 1;
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break;
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case 'q': /* -q (Undoc'd) ... die on quit */
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quitit = 1;
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break;
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case 's': /* -s Read from std input */
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nofile = 1;
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break;
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case 't': /* -t Read one line from input */
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onelflg = 2;
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prompt = 0;
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nofile = 1;
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break;
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case 'v': /* -v Echo hist expanded input */
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nverbose = 1; /* ... later */
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break;
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case 'x': /* -x Echo just before execution */
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nexececho = 1; /* ... later */
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break;
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case 'V': /* -V Echo hist expanded input */
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setNS(STRverbose); /* NOW! */
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break;
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case 'X': /* -X Echo just before execution */
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setNS(STRecho); /* NOW! */
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break;
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} while (*tcp);
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tempv++, argc--;
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}
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if (quitit) /* With all due haste, for debugging */
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(void)signal(SIGQUIT, SIG_DFL);
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/*
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* Unless prevented by -, -c, -i, -s, or -t, if there are remaining
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* arguments the first of them is the name of a shell file from which to
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* read commands.
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*/
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if (nofile == 0 && argc > 0) {
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nofile = open(tempv[0], O_RDONLY);
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if (nofile < 0) {
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child = 1; /* So this doesn't return */
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stderror(ERR_SYSTEM, tempv[0], strerror(errno));
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}
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ffile = SAVE(tempv[0]);
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/*
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* Replace FSHIN. Handle /dev/std{in,out,err} specially
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* since once they are closed we cannot open them again.
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* In that case we use our own saved descriptors
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*/
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if ((SHIN = dmove(nofile, FSHIN)) < 0)
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switch(nofile) {
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case 0:
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SHIN = FSHIN;
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break;
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case 1:
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SHIN = FSHOUT;
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break;
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case 2:
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SHIN = FSHERR;
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break;
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default:
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stderror(ERR_SYSTEM, tempv[0], strerror(errno));
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/* NOTREACHED */
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}
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(void)ioctl(SHIN, FIOCLEX, NULL);
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prompt = 0;
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/* argc not used any more */ tempv++;
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}
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intty = isatty(SHIN);
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intty |= intact;
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if (intty || (intact && isatty(SHOUT))) {
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if (!batch && (uid != euid || gid != egid)) {
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errno = EACCES;
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child = 1; /* So this doesn't return */
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stderror(ERR_SYSTEM, "csh", strerror(errno));
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}
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}
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/*
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* Decide whether we should play with signals or not. If we are explicitly
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* told (via -i, or -) or we are a login shell (arg0 starts with -) or the
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* input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx")
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* Note that in only the login shell is it likely that parent may have set
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* signals to be ignored
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*/
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if (loginsh || intact || (intty && isatty(SHOUT)))
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setintr = 1;
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settell();
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/*
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* Save the remaining arguments in argv.
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*/
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setq(STRargv, blk2short(tempv), &shvhed);
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|
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/*
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* Set up the prompt.
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*/
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if (prompt) {
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set(STRprompt, Strsave(uid == 0 ? STRsymhash : STRsymcent));
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/* that's a meta-questionmark */
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set(STRprompt2, Strsave(STRmquestion));
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}
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/*
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* If we are an interactive shell, then start fiddling with the signals;
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* this is a tricky game.
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*/
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shpgrp = getpgrp();
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opgrp = tpgrp = -1;
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if (setintr) {
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**argv = '-';
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if (!quitit) /* Wary! */
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(void)signal(SIGQUIT, SIG_IGN);
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(void)signal(SIGINT, pintr);
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sigemptyset(&nsigset);
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(void)sigaddset(&nsigset, SIGINT);
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(void)sigprocmask(SIG_BLOCK, &nsigset, NULL);
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(void)signal(SIGTERM, SIG_IGN);
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if (quitit == 0 && arginp == 0) {
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(void)signal(SIGTSTP, SIG_IGN);
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(void)signal(SIGTTIN, SIG_IGN);
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(void)signal(SIGTTOU, SIG_IGN);
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/*
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* Wait till in foreground, in case someone stupidly runs csh &
|
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* dont want to try to grab away the tty.
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*/
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if (isatty(FSHERR))
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f = FSHERR;
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else if (isatty(FSHOUT))
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f = FSHOUT;
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else if (isatty(OLDSTD))
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f = OLDSTD;
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else
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f = -1;
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retry:
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if ((tpgrp = tcgetpgrp(f)) != -1) {
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if (tpgrp != shpgrp) {
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sig_t old = signal(SIGTTIN, SIG_DFL);
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(void)kill(0, SIGTTIN);
|
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(void)signal(SIGTTIN, old);
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goto retry;
|
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}
|
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opgrp = shpgrp;
|
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shpgrp = getpid();
|
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tpgrp = shpgrp;
|
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/*
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* Setpgid will fail if we are a session leader and
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* mypid == mypgrp (POSIX 4.3.3)
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*/
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if (opgrp != shpgrp)
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if (setpgid(0, shpgrp) == -1)
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goto notty;
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/*
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* We do that after we set our process group, to make sure
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* that the process group belongs to a process in the same
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* session as the tty (our process and our group) (POSIX 7.2.4)
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*/
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if (tcsetpgrp(f, shpgrp) == -1)
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goto notty;
|
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(void)ioctl(dcopy(f, FSHTTY), FIOCLEX, NULL);
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}
|
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if (tpgrp == -1) {
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notty:
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|
(void)fprintf(csherr, "Warning: no access to tty (%s).\n",
|
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strerror(errno));
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(void)fprintf(csherr, "Thus no job control in this shell.\n");
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}
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}
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}
|
|
if ((setintr == 0) && (parintr == SIG_DFL))
|
|
setintr = 1;
|
|
(void)signal(SIGCHLD, pchild); /* while signals not ready */
|
|
|
|
/*
|
|
* Set an exit here in case of an interrupt or error reading the shell
|
|
* start-up scripts.
|
|
*/
|
|
reenter = setexit(); /* PWP */
|
|
haderr = 0; /* In case second time through */
|
|
if (!fast && reenter == 0) {
|
|
/* Will have value(STRhome) here because set fast if don't */
|
|
{
|
|
sig_t oparintr;
|
|
sigset_t osigset;
|
|
int osetintr;
|
|
|
|
oparintr = parintr;
|
|
osetintr = setintr;
|
|
sigemptyset(&nsigset);
|
|
(void)sigaddset(&nsigset, SIGINT);
|
|
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
|
|
|
|
setintr = 0;
|
|
parintr = SIG_IGN; /* Disable onintr */
|
|
#ifdef _PATH_DOTCSHRC
|
|
(void)srcfile(_PATH_DOTCSHRC, 0, 0);
|
|
#endif
|
|
if (!fast && !arginp && !onelflg)
|
|
dohash(NULL, NULL);
|
|
#ifdef _PATH_DOTLOGIN
|
|
if (loginsh)
|
|
(void)srcfile(_PATH_DOTLOGIN, 0, 0);
|
|
#endif
|
|
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
|
|
setintr = osetintr;
|
|
parintr = oparintr;
|
|
}
|
|
(void)srccat(value(STRhome), STRsldotcshrc);
|
|
|
|
if (!fast && !arginp && !onelflg && !havhash)
|
|
dohash(NULL, NULL);
|
|
/*
|
|
* Source history before .login so that it is available in .login
|
|
*/
|
|
if ((cp = value(STRhistfile)) != STRNULL)
|
|
loadhist[2] = cp;
|
|
dosource(loadhist, NULL);
|
|
if (loginsh)
|
|
(void)srccat(value(STRhome), STRsldotlogin);
|
|
}
|
|
|
|
/*
|
|
* Now are ready for the -v and -x flags
|
|
*/
|
|
if (nverbose)
|
|
setNS(STRverbose);
|
|
if (nexececho)
|
|
setNS(STRecho);
|
|
|
|
/*
|
|
* All the rest of the world is inside this call. The argument to process
|
|
* indicates whether it should catch "error unwinds". Thus if we are a
|
|
* interactive shell our call here will never return by being blown past on
|
|
* an error.
|
|
*/
|
|
process(setintr);
|
|
|
|
/*
|
|
* Mop-up.
|
|
*/
|
|
if (intty) {
|
|
if (loginsh) {
|
|
(void)fprintf(cshout, "logout\n");
|
|
(void)close(SHIN);
|
|
child = 1;
|
|
goodbye();
|
|
}
|
|
else {
|
|
(void)fprintf(cshout, "exit\n");
|
|
}
|
|
}
|
|
rechist();
|
|
exitstat();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
void
|
|
untty(void)
|
|
{
|
|
if (tpgrp > 0) {
|
|
(void)setpgid(0, opgrp);
|
|
(void)tcsetpgrp(FSHTTY, opgrp);
|
|
}
|
|
}
|
|
|
|
void
|
|
importpath(Char *cp)
|
|
{
|
|
Char *dp, **pv;
|
|
int c, i;
|
|
|
|
i = 0;
|
|
for (dp = cp; *dp; dp++)
|
|
if (*dp == ':')
|
|
i++;
|
|
/*
|
|
* i+2 where i is the number of colons in the path. There are i+1
|
|
* directories in the path plus we need room for a zero terminator.
|
|
*/
|
|
pv = (Char **)xcalloc((size_t) (i + 2), sizeof(Char **));
|
|
dp = cp;
|
|
i = 0;
|
|
if (*dp)
|
|
for (;;) {
|
|
if ((c = *dp) == ':' || c == 0) {
|
|
*dp = 0;
|
|
pv[i++] = Strsave(*cp ? cp : STRdot);
|
|
if (c) {
|
|
cp = dp + 1;
|
|
*dp = ':';
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
dp++;
|
|
}
|
|
pv[i] = 0;
|
|
setq(STRpath, pv, &shvhed);
|
|
}
|
|
|
|
/*
|
|
* Source to the file which is the catenation of the argument names.
|
|
*/
|
|
static int
|
|
srccat(Char *cp, Char *dp)
|
|
{
|
|
Char *ep;
|
|
char *ptr;
|
|
|
|
ep = Strspl(cp, dp);
|
|
ptr = short2str(ep);
|
|
xfree((ptr_t) ep);
|
|
return srcfile(ptr, mflag ? 0 : 1, 0);
|
|
}
|
|
|
|
/*
|
|
* Source to a file putting the file descriptor in a safe place (> 2).
|
|
*/
|
|
static int
|
|
srcfile(char *f, bool onlyown, bool flag)
|
|
{
|
|
int unit;
|
|
|
|
if ((unit = open(f, O_RDONLY)) == -1)
|
|
return 0;
|
|
unit = dmove(unit, -1);
|
|
|
|
(void) ioctl(unit, FIOCLEX, NULL);
|
|
srcunit(unit, onlyown, flag);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Source to a unit. If onlyown it must be our file or our group or
|
|
* we don't chance it. This occurs on ".cshrc"s and the like.
|
|
*/
|
|
int insource;
|
|
|
|
static void
|
|
srcunit(int unit, bool onlyown, bool hflg)
|
|
{
|
|
/* We have to push down a lot of state here */
|
|
/* All this could go into a structure */
|
|
struct whyle *oldwhyl;
|
|
struct Bin saveB;
|
|
sigset_t nsigset, osigset;
|
|
jmp_buf oldexit;
|
|
Char *oarginp, *oevalp, **oevalvec, *ogointr;
|
|
char OHIST;
|
|
int oSHIN, oinsource, oldintty, oonelflg;
|
|
bool oenterhist, otell;
|
|
/* The (few) real local variables */
|
|
int my_reenter;
|
|
|
|
oSHIN = -1;
|
|
oldintty = intty;
|
|
oinsource = insource;
|
|
oldwhyl = whyles;
|
|
ogointr = gointr;
|
|
oarginp = arginp;
|
|
oevalp = evalp;
|
|
oevalvec = evalvec;
|
|
oonelflg = onelflg;
|
|
oenterhist = enterhist;
|
|
OHIST = HIST;
|
|
otell = cantell;
|
|
|
|
if (unit < 0)
|
|
return;
|
|
if (didfds)
|
|
donefds();
|
|
if (onlyown) {
|
|
struct stat stb;
|
|
|
|
if (fstat(unit, &stb) < 0) {
|
|
(void)close(unit);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* There is a critical section here while we are pushing down the input
|
|
* stream since we have stuff in different structures. If we weren't
|
|
* careful an interrupt could corrupt SHIN's Bin structure and kill the
|
|
* shell.
|
|
*
|
|
* We could avoid the critical region by grouping all the stuff in a single
|
|
* structure and pointing at it to move it all at once. This is less
|
|
* efficient globally on many variable references however.
|
|
*/
|
|
insource = 1;
|
|
getexit(oldexit);
|
|
|
|
if (setintr) {
|
|
sigemptyset(&nsigset);
|
|
(void)sigaddset(&nsigset, SIGINT);
|
|
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
|
|
}
|
|
/* Setup the new values of the state stuff saved above */
|
|
(void)memcpy(&saveB, &B, sizeof(B));
|
|
fbuf = NULL;
|
|
fseekp = feobp = fblocks = 0;
|
|
oSHIN = SHIN, SHIN = unit, arginp = 0, onelflg = 0;
|
|
intty = isatty(SHIN), whyles = 0, gointr = 0;
|
|
evalvec = 0;
|
|
evalp = 0;
|
|
enterhist = hflg;
|
|
if (enterhist)
|
|
HIST = '\0';
|
|
|
|
/*
|
|
* Now if we are allowing commands to be interrupted, we let ourselves be
|
|
* interrupted.
|
|
*/
|
|
if (setintr)
|
|
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
|
|
settell();
|
|
|
|
if ((my_reenter = setexit()) == 0)
|
|
process(0); /* 0 -> blow away on errors */
|
|
|
|
if (setintr)
|
|
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
|
|
if (oSHIN >= 0) {
|
|
int i;
|
|
|
|
/* We made it to the new state... free up its storage */
|
|
/* This code could get run twice but xfree doesn't care */
|
|
for (i = 0; i < fblocks; i++)
|
|
xfree((ptr_t) fbuf[i]);
|
|
xfree((ptr_t) fbuf);
|
|
|
|
/* Reset input arena */
|
|
(void)memcpy(&B, &saveB, sizeof(B));
|
|
|
|
(void)close(SHIN), SHIN = oSHIN;
|
|
arginp = oarginp, onelflg = oonelflg;
|
|
evalp = oevalp, evalvec = oevalvec;
|
|
intty = oldintty, whyles = oldwhyl, gointr = ogointr;
|
|
if (enterhist)
|
|
HIST = OHIST;
|
|
enterhist = oenterhist;
|
|
cantell = otell;
|
|
}
|
|
|
|
resexit(oldexit);
|
|
/*
|
|
* If process reset() (effectively an unwind) then we must also unwind.
|
|
*/
|
|
if (my_reenter)
|
|
stderror(ERR_SILENT);
|
|
insource = oinsource;
|
|
}
|
|
|
|
void
|
|
rechist(void)
|
|
{
|
|
Char buf[BUFSIZE], hbuf[BUFSIZE], *hfile;
|
|
int fp, ftmp, oldidfds;
|
|
struct varent *shist;
|
|
|
|
if (!fast) {
|
|
/*
|
|
* If $savehist is just set, we use the value of $history
|
|
* else we use the value in $savehist
|
|
*/
|
|
if ((shist = adrof(STRsavehist)) != NULL) {
|
|
if (shist->vec[0][0] != '\0')
|
|
(void)Strcpy(hbuf, shist->vec[0]);
|
|
else if ((shist = adrof(STRhistory)) && shist->vec[0][0] != '\0')
|
|
(void)Strcpy(hbuf, shist->vec[0]);
|
|
else
|
|
return;
|
|
}
|
|
else
|
|
return;
|
|
|
|
if ((hfile = value(STRhistfile)) == STRNULL) {
|
|
hfile = Strcpy(buf, value(STRhome));
|
|
(void) Strcat(buf, STRsldthist);
|
|
}
|
|
|
|
if ((fp = open(short2str(hfile), O_WRONLY | O_CREAT | O_TRUNC,
|
|
0600)) == -1)
|
|
return;
|
|
|
|
oldidfds = didfds;
|
|
didfds = 0;
|
|
ftmp = SHOUT;
|
|
SHOUT = fp;
|
|
dumphist[2] = hbuf;
|
|
dohist(dumphist, NULL);
|
|
SHOUT = ftmp;
|
|
(void)close(fp);
|
|
didfds = oldidfds;
|
|
}
|
|
}
|
|
|
|
void
|
|
goodbye(void)
|
|
{
|
|
rechist();
|
|
|
|
if (loginsh) {
|
|
(void)signal(SIGQUIT, SIG_IGN);
|
|
(void)signal(SIGINT, SIG_IGN);
|
|
(void)signal(SIGTERM, SIG_IGN);
|
|
setintr = 0; /* No interrupts after "logout" */
|
|
if (!(adrof(STRlogout)))
|
|
set(STRlogout, STRnormal);
|
|
#ifdef _PATH_DOTLOGOUT
|
|
(void)srcfile(_PATH_DOTLOGOUT, 0, 0);
|
|
#endif
|
|
if (adrof(STRhome))
|
|
(void)srccat(value(STRhome), STRsldtlogout);
|
|
}
|
|
exitstat();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
__dead void
|
|
exitstat(void)
|
|
{
|
|
Char *s;
|
|
#ifdef PROF
|
|
monitor(0);
|
|
#endif
|
|
/*
|
|
* Note that if STATUS is corrupted (i.e. getn bombs) then error will exit
|
|
* directly because we poke child here. Otherwise we might continue
|
|
* unwarrantedly (sic).
|
|
*/
|
|
child = 1;
|
|
s = value(STRstatus);
|
|
xexit(s ? getn(s) : 0);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* in the event of a HUP we want to save the history
|
|
*/
|
|
static void
|
|
phup(int sig)
|
|
{
|
|
rechist();
|
|
|
|
/*
|
|
* We kill the last foreground process group. It then becomes
|
|
* responsible to propagate the SIGHUP to its progeny.
|
|
*/
|
|
{
|
|
struct process *pp, *np;
|
|
|
|
for (pp = proclist.p_next; pp; pp = pp->p_next) {
|
|
np = pp;
|
|
/*
|
|
* Find if this job is in the foreground. It could be that
|
|
* the process leader has exited and the foreground flag
|
|
* is cleared for it.
|
|
*/
|
|
do
|
|
/*
|
|
* If a process is in the foreground; we try to kill
|
|
* it's process group. If we succeed, then the
|
|
* whole job is gone. Otherwise we keep going...
|
|
* But avoid sending HUP to the shell again.
|
|
*/
|
|
if ((np->p_flags & PFOREGND) != 0 && np->p_jobid != shpgrp &&
|
|
kill(-np->p_jobid, SIGHUP) != -1) {
|
|
/* In case the job was suspended... */
|
|
(void)kill(-np->p_jobid, SIGCONT);
|
|
break;
|
|
}
|
|
while ((np = np->p_friends) != pp);
|
|
}
|
|
}
|
|
xexit(sig);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
Char *jobargv[2] = {STRjobs, 0};
|
|
|
|
/*
|
|
* Catch an interrupt, e.g. during lexical input.
|
|
* If we are an interactive shell, we reset the interrupt catch
|
|
* immediately. In any case we drain the shell output,
|
|
* and finally go through the normal error mechanism, which
|
|
* gets a chance to make the shell go away.
|
|
*/
|
|
/* ARGSUSED */
|
|
void
|
|
pintr(int notused)
|
|
{
|
|
pintr1(1);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
void
|
|
pintr1(bool wantnl)
|
|
{
|
|
Char **v;
|
|
sigset_t nsigset, osigset;
|
|
|
|
sigemptyset(&nsigset);
|
|
(void)sigprocmask(SIG_BLOCK, &nsigset, &osigset);
|
|
if (setintr) {
|
|
nsigset = osigset;
|
|
(void)sigdelset(&nsigset, SIGINT);
|
|
(void)sigprocmask(SIG_SETMASK, &nsigset, NULL);
|
|
if (pjobs) {
|
|
pjobs = 0;
|
|
(void)fprintf(cshout, "\n");
|
|
dojobs(jobargv, NULL);
|
|
stderror(ERR_NAME | ERR_INTR);
|
|
}
|
|
}
|
|
(void)sigdelset(&osigset, SIGCHLD);
|
|
(void)sigprocmask(SIG_SETMASK, &osigset, NULL);
|
|
(void)fpurge(cshout);
|
|
(void)endpwent();
|
|
|
|
/*
|
|
* If we have an active "onintr" then we search for the label. Note that if
|
|
* one does "onintr -" then we shan't be interruptible so we needn't worry
|
|
* about that here.
|
|
*/
|
|
if (gointr) {
|
|
gotolab(gointr);
|
|
timflg = 0;
|
|
if ((v = pargv) != NULL)
|
|
pargv = 0, blkfree(v);
|
|
if ((v = gargv) != NULL)
|
|
gargv = 0, blkfree(v);
|
|
reset();
|
|
}
|
|
else if (intty && wantnl) {
|
|
(void)fputc('\r', cshout);
|
|
(void)fputc('\n', cshout);
|
|
}
|
|
stderror(ERR_SILENT);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* Process is the main driving routine for the shell.
|
|
* It runs all command processing, except for those within { ... }
|
|
* in expressions (which is run by a routine evalav in sh.exp.c which
|
|
* is a stripped down process), and `...` evaluation which is run
|
|
* also by a subset of this code in sh.glob.c in the routine backeval.
|
|
*
|
|
* The code here is a little strange because part of it is interruptible
|
|
* and hence freeing of structures appears to occur when none is necessary
|
|
* if this is ignored.
|
|
*
|
|
* Note that if catch is not set then we will unwind on any error.
|
|
* If an end-of-file occurs, we return.
|
|
*/
|
|
static struct command *savet = NULL;
|
|
|
|
void
|
|
process(bool catch)
|
|
{
|
|
struct command *t;
|
|
jmp_buf osetexit;
|
|
sigset_t nsigset;
|
|
|
|
t = savet;
|
|
savet = NULL;
|
|
getexit(osetexit);
|
|
for (;;) {
|
|
pendjob();
|
|
paraml.next = paraml.prev = ¶ml;
|
|
paraml.word = STRNULL;
|
|
(void)setexit();
|
|
justpr = enterhist; /* execute if not entering history */
|
|
|
|
/*
|
|
* Interruptible during interactive reads
|
|
*/
|
|
if (setintr) {
|
|
sigemptyset(&nsigset);
|
|
(void)sigaddset(&nsigset, SIGINT);
|
|
(void)sigprocmask(SIG_UNBLOCK, &nsigset, NULL);
|
|
}
|
|
|
|
/*
|
|
* For the sake of reset()
|
|
*/
|
|
freelex(¶ml);
|
|
if (savet)
|
|
freesyn(savet), savet = NULL;
|
|
|
|
if (haderr) {
|
|
if (!catch) {
|
|
/* unwind */
|
|
doneinp = 0;
|
|
resexit(osetexit);
|
|
savet = t;
|
|
reset();
|
|
}
|
|
haderr = 0;
|
|
/*
|
|
* Every error is eventually caught here or the shell dies. It is
|
|
* at this point that we clean up any left-over open files, by
|
|
* closing all but a fixed number of pre-defined files. Thus
|
|
* routines don't have to worry about leaving files open due to
|
|
* deeper errors... they will get closed here.
|
|
*/
|
|
closem();
|
|
continue;
|
|
}
|
|
if (doneinp) {
|
|
doneinp = 0;
|
|
break;
|
|
}
|
|
if (chkstop)
|
|
chkstop--;
|
|
if (neednote)
|
|
pnote();
|
|
if (intty && prompt && evalvec == 0) {
|
|
mailchk();
|
|
/*
|
|
* If we are at the end of the input buffer then we are going to
|
|
* read fresh stuff. Otherwise, we are rereading input and don't
|
|
* need or want to prompt.
|
|
*/
|
|
if (aret == F_SEEK && fseekp == feobp)
|
|
printprompt();
|
|
(void)fflush(cshout);
|
|
}
|
|
if (seterr) {
|
|
xfree((ptr_t) seterr);
|
|
seterr = NULL;
|
|
}
|
|
|
|
/*
|
|
* Echo not only on VERBOSE, but also with history expansion. If there
|
|
* is a lexical error then we forego history echo.
|
|
*/
|
|
if ((lex(¶ml) && !seterr && intty) || adrof(STRverbose)) {
|
|
int odidfds = didfds;
|
|
fflush(csherr);
|
|
didfds = 0;
|
|
prlex(csherr, ¶ml);
|
|
fflush(csherr);
|
|
didfds = odidfds;
|
|
}
|
|
|
|
/*
|
|
* The parser may lose space if interrupted.
|
|
*/
|
|
if (setintr)
|
|
(void)sigprocmask(SIG_BLOCK, &nsigset, NULL);
|
|
|
|
/*
|
|
* Save input text on the history list if reading in old history, or it
|
|
* is from the terminal at the top level and not in a loop.
|
|
*
|
|
* PWP: entry of items in the history list while in a while loop is done
|
|
* elsewhere...
|
|
*/
|
|
if (enterhist || (catch && intty && !whyles))
|
|
savehist(¶ml);
|
|
|
|
/*
|
|
* Print lexical error messages, except when sourcing history lists.
|
|
*/
|
|
if (!enterhist && seterr)
|
|
stderror(ERR_OLD);
|
|
|
|
/*
|
|
* If had a history command :p modifier then this is as far as we
|
|
* should go
|
|
*/
|
|
if (justpr)
|
|
reset();
|
|
|
|
alias(¶ml);
|
|
|
|
/*
|
|
* Parse the words of the input into a parse tree.
|
|
*/
|
|
savet = syntax(paraml.next, ¶ml, 0);
|
|
if (seterr)
|
|
stderror(ERR_OLD);
|
|
|
|
execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL);
|
|
|
|
/*
|
|
* Made it!
|
|
*/
|
|
freelex(¶ml);
|
|
freesyn((struct command *) savet), savet = NULL;
|
|
}
|
|
resexit(osetexit);
|
|
savet = t;
|
|
}
|
|
|
|
void
|
|
/*ARGSUSED*/
|
|
dosource(Char **v, struct command *t)
|
|
{
|
|
Char buf[BUFSIZE], *f;
|
|
bool hflg;
|
|
|
|
hflg = 0;
|
|
v++;
|
|
if (*v && eq(*v, STRmh)) {
|
|
if (*++v == NULL)
|
|
stderror(ERR_NAME | ERR_HFLAG);
|
|
hflg++;
|
|
}
|
|
(void)Strcpy(buf, *v);
|
|
f = globone(buf, G_ERROR);
|
|
(void)strcpy((char *)buf, short2str(f));
|
|
xfree((ptr_t) f);
|
|
if (!srcfile((char *)buf, 0, hflg) && !hflg)
|
|
stderror(ERR_SYSTEM, (char *)buf, strerror(errno));
|
|
}
|
|
|
|
/*
|
|
* Check for mail.
|
|
* If we are a login shell, then we don't want to tell
|
|
* about any mail file unless its been modified
|
|
* after the time we started.
|
|
* This prevents us from telling the user things he already
|
|
* knows, since the login program insists on saying
|
|
* "You have mail."
|
|
*/
|
|
static void
|
|
mailchk(void)
|
|
{
|
|
struct stat stb;
|
|
struct varent *v;
|
|
Char **vp;
|
|
time_t t;
|
|
int cnt, intvl;
|
|
bool new;
|
|
|
|
v = adrof(STRmail);
|
|
if (v == 0)
|
|
return;
|
|
(void)time(&t);
|
|
vp = v->vec;
|
|
cnt = blklen(vp);
|
|
intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL;
|
|
if (intvl < 1)
|
|
intvl = 1;
|
|
if (chktim + intvl > t)
|
|
return;
|
|
for (; *vp; vp++) {
|
|
if (stat(short2str(*vp), &stb) < 0)
|
|
continue;
|
|
new = stb.st_mtime > time0.tv_sec;
|
|
if (stb.st_size == 0 || stb.st_atime > stb.st_mtime ||
|
|
(stb.st_atime < chktim && stb.st_mtime < chktim) ||
|
|
(loginsh && !new))
|
|
continue;
|
|
if (cnt == 1)
|
|
(void)fprintf(cshout, "You have %smail.\n", new ? "new " : "");
|
|
else
|
|
(void)fprintf(cshout, "%s in %s.\n", new ? "New mail" : "Mail",
|
|
vis_str(*vp));
|
|
}
|
|
chktim = t;
|
|
}
|
|
|
|
/*
|
|
* Extract a home directory from the password file
|
|
* The argument points to a buffer where the name of the
|
|
* user whose home directory is sought is currently.
|
|
* We write the home directory of the user back there.
|
|
*/
|
|
int
|
|
gethdir(Char *home)
|
|
{
|
|
struct passwd *pw;
|
|
Char *h;
|
|
|
|
/*
|
|
* Is it us?
|
|
*/
|
|
if (*home == '\0') {
|
|
if ((h = value(STRhome)) != NULL) {
|
|
(void)Strcpy(home, h);
|
|
return 0;
|
|
}
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
if ((pw = getpwnam(short2str(home))) != NULL) {
|
|
(void)Strcpy(home, str2short(pw->pw_dir));
|
|
return 0;
|
|
}
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* When didfds is set, we do I/O from 0, 1, 2 otherwise from 15, 16, 17
|
|
* We also check if the shell has already changed the descriptor to point to
|
|
* 0, 1, 2 when didfds is set.
|
|
*/
|
|
#define DESC(a) (*((int *) (a)) - (didfds && *((int *) a) >= FSHIN ? FSHIN : 0))
|
|
|
|
static int
|
|
readf(void *oreo, char *buf, int siz)
|
|
{
|
|
return read(DESC(oreo), buf, siz);
|
|
}
|
|
|
|
|
|
static int
|
|
writef(void *oreo, const char *buf, int siz)
|
|
{
|
|
return write(DESC(oreo), buf, siz);
|
|
}
|
|
|
|
static fpos_t
|
|
seekf(void *oreo, fpos_t off, int whence)
|
|
{
|
|
return lseek(DESC(oreo), off, whence);
|
|
}
|
|
|
|
|
|
static int
|
|
closef(void *oreo)
|
|
{
|
|
return close(DESC(oreo));
|
|
}
|
|
|
|
|
|
/*
|
|
* Print the visible version of a string.
|
|
*/
|
|
int
|
|
vis_fputc(int ch, FILE *fp)
|
|
{
|
|
char uenc[5]; /* 4 + NULL */
|
|
|
|
if (ch & QUOTE)
|
|
return fputc(ch & TRIM, fp);
|
|
/*
|
|
* XXX: When we are in AsciiOnly we want all characters >= 0200 to
|
|
* be encoded, but currently there is no way in vis to do that.
|
|
*/
|
|
(void)vis(uenc, ch & TRIM, VIS_NOSLASH, 0);
|
|
return (fputs(uenc, fp));
|
|
}
|
|
|
|
/*
|
|
* Move the initial descriptors to their eventual
|
|
* resting places, closing all other units.
|
|
*/
|
|
void
|
|
initdesc(void)
|
|
{
|
|
didfds = 0; /* 0, 1, 2 aren't set up */
|
|
(void)ioctl(SHIN = dcopy(0, FSHIN), FIOCLEX, NULL);
|
|
(void)ioctl(SHOUT = dcopy(1, FSHOUT), FIOCLEX, NULL);
|
|
(void)ioctl(SHERR = dcopy(2, FSHERR), FIOCLEX, NULL);
|
|
(void)ioctl(OLDSTD = dcopy(SHIN, FOLDSTD), FIOCLEX, NULL);
|
|
closem();
|
|
}
|
|
|
|
|
|
__dead void
|
|
#ifdef PROF
|
|
done(int i)
|
|
#else
|
|
xexit(int i)
|
|
#endif
|
|
{
|
|
untty();
|
|
_exit(i);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
#ifndef _PATH_DEFPATH
|
|
static Char **
|
|
defaultpath(void)
|
|
{
|
|
struct stat stb;
|
|
Char **blk, **blkp;
|
|
char *ptr;
|
|
|
|
blkp = blk = (Char **)xmalloc((size_t) sizeof(Char *) * 10);
|
|
|
|
#define DIRAPPEND(a) \
|
|
if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \
|
|
*blkp++ = SAVE(ptr)
|
|
|
|
DIRAPPEND(_PATH_BIN);
|
|
DIRAPPEND(_PATH_USRBIN);
|
|
|
|
#undef DIRAPPEND
|
|
|
|
#if 0
|
|
if (euid != 0 && uid != 0)
|
|
*blkp++ = Strsave(STRdot);
|
|
#endif
|
|
|
|
*blkp = NULL;
|
|
return (blk);
|
|
}
|
|
#endif /* _PATH_DEFPATH */
|
|
|
|
void
|
|
printprompt(void)
|
|
{
|
|
Char *cp;
|
|
|
|
if (!whyles) {
|
|
for (cp = value(STRprompt); *cp; cp++)
|
|
if (*cp == HIST)
|
|
(void)fprintf(cshout, "%d", eventno + 1);
|
|
else {
|
|
if (*cp == '\\' && cp[1] == HIST)
|
|
cp++;
|
|
(void)vis_fputc(*cp | QUOTE, cshout);
|
|
}
|
|
}
|
|
else
|
|
/*
|
|
* Prompt for forward reading loop body content.
|
|
*/
|
|
(void)fprintf(cshout, "? ");
|
|
(void)fflush(cshout);
|
|
}
|