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