NetBSD/usr.bin/vi/ex/ex_shell.c

151 lines
4.2 KiB
C

/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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[] = "@(#)ex_shell.c 8.26 (Berkeley) 8/17/94";
#endif /* not lint */
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "compat.h"
#include <db.h>
#include <regex.h>
#include "vi.h"
#include "excmd.h"
#include "../svi/svi_screen.h"
/*
* ex_shell -- :sh[ell]
* Invoke the program named in the SHELL environment variable
* with the argument -i.
*/
int
ex_shell(sp, ep, cmdp)
SCR *sp;
EXF *ep;
EXCMDARG *cmdp;
{
char buf[MAXPATHLEN];
(void)snprintf(buf, sizeof(buf), "%s -i", O_STR(sp, O_SHELL));
return (ex_exec_proc(sp, buf, "\n", NULL));
}
/*
* ex_exec_proc --
* Run a separate process.
*/
int
ex_exec_proc(sp, cmd, p1, p2)
SCR *sp;
char *cmd, *p1, *p2;
{
const char *name;
pid_t pid;
int rval, teardown;
/* Clear the rest of the screen. */
if (sp->s_clear(sp))
return (1);
/* Save ex/vi terminal settings, and restore the original ones. */
teardown = !ex_sleave(sp);
/*
* Flush waiting messages (autowrite, for example) so the output
* matches historic practice.
*/
(void)sex_refresh(sp, sp->ep);
/* Put out various messages. */
if (p1 != NULL)
(void)write(STDOUT_FILENO, p1, strlen(p1));
if (p2 != NULL)
(void)write(STDOUT_FILENO, p2, strlen(p2));
SIGBLOCK(sp->gp);
switch (pid = vfork()) {
case -1: /* Error. */
SIGUNBLOCK(sp->gp);
msgq(sp, M_SYSERR, "vfork");
rval = 1;
break;
case 0: /* Utility. */
/* The utility has default signal behavior. */
sig_end();
if ((name = strrchr(O_STR(sp, O_SHELL), '/')) == NULL)
name = O_STR(sp, O_SHELL);
else
++name;
execl(O_STR(sp, O_SHELL), name, "-c", cmd, NULL);
msgq(sp, M_ERR, "Error: execl: %s: %s",
O_STR(sp, O_SHELL), strerror(errno));
_exit(127);
/* NOTREACHED */
default: /* Parent. */
SIGUNBLOCK(sp->gp);
rval = proc_wait(sp, (long)pid, cmd, 0);
break;
}
/* Restore ex/vi terminal settings. */
if (teardown)
ex_rleave(sp);
/*
* XXX
* Stat of the tty structures (see ex_sleave, ex_rleave) only give
* us 1-second resolution on the tty changes. A fast '!' command,
* e.g. ":!pwd" can beat us to the refresh. When there's better
* resolution from the stat(2) timers, this can go away.
*/
F_SET(sp, S_REFRESH);
return (rval);
}