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/* $OpenBSD: ex_shell.c,v 1.15 2015/03/28 12:54:37 bcallah Exp $ */
/*-
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1992, 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#include <sys/queue.h>
#include <sys/wait.h>
#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "../common/common.h"
#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
/*
* ex_shell -- :sh[ell]
* Invoke the program named in the SHELL environment variable
* with the argument -i.
*
* PUBLIC: int ex_shell(SCR *, EXCMD *);
*/
int
ex_shell(SCR *sp, EXCMD *cmdp)
{
int rval;
char buf[PATH_MAX];
/* We'll need a shell. */
if (opts_empty(sp, O_SHELL, 0))
return (1);
/*
* XXX
* Assumes all shells use -i.
*/
(void)snprintf(buf, sizeof(buf), "%s -i", O_STR(sp, O_SHELL));
/* Restore the window name. */
(void)sp->gp->scr_rename(sp, NULL, 0);
/* If we're still in a vi screen, move out explicitly. */
rval = ex_exec_proc(sp, cmdp, buf, NULL, !F_ISSET(sp, SC_SCR_EXWROTE));
/* Set the window name. */
(void)sp->gp->scr_rename(sp, sp->frp->name, 1);
/*
* !!!
* Historically, vi didn't require a continue message after the
* return of the shell. Match it.
*/
F_SET(sp, SC_EX_WAIT_NO);
return (rval);
}
/*
* ex_exec_proc --
* Run a separate process.
*
* PUBLIC: int ex_exec_proc(SCR *, EXCMD *, char *, const char *, int);
*/
int
ex_exec_proc(SCR *sp, EXCMD *cmdp, char *cmd, const char *msg,
int need_newline)
{
GS *gp;
const char *name;
pid_t pid;
gp = sp->gp;
/* We'll need a shell. */
if (opts_empty(sp, O_SHELL, 0))
return (1);
/* Enter ex mode. */
if (F_ISSET(sp, SC_VI)) {
if (gp->scr_screen(sp, SC_EX)) {
ex_emsg(sp, cmdp->cmd->name, EXM_NOCANON);
return (1);
}
(void)gp->scr_attr(sp, SA_ALTERNATE, 0);
F_SET(sp, SC_SCR_EX | SC_SCR_EXWROTE);
}
/* Put out additional newline, message. */
if (need_newline)
(void)ex_puts(sp, "\n");
if (msg != NULL) {
(void)ex_puts(sp, msg);
(void)ex_puts(sp, "\n");
}
(void)ex_fflush(sp);
switch (pid = vfork()) {
case -1: /* Error. */
msgq(sp, M_SYSERR, "vfork");
return (1);
case 0: /* Utility. */
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, (char *)NULL);
msgq_str(sp, M_SYSERR, O_STR(sp, O_SHELL), "execl: %s");
_exit(127);
/* NOTREACHED */
default: /* Parent. */
return (proc_wait(sp, pid, cmd, 0, 0));
}
/* NOTREACHED */
}
/*
* proc_wait --
* Wait for one of the processes.
*
* !!!
* The pid_t type varies in size from a short to a long depending on the
* system. It has to be cast into something or the standard promotion
* rules get you. I'm using a long based on the belief that nobody is
* going to make it unsigned and it's unlikely to be a quad.
*
* PUBLIC: int proc_wait(SCR *, pid_t, const char *, int, int);
*/
int
proc_wait(SCR *sp, pid_t pid, const char *cmd, int silent, int okpipe)
{
size_t len;
int nf, pstat;
char *p;
/* Wait for the utility, ignoring interruptions. */
for (;;) {
errno = 0;
if (waitpid(pid, &pstat, 0) != -1)
break;
if (errno != EINTR) {
msgq(sp, M_SYSERR, "waitpid");
return (1);
}
}
/*
* Display the utility's exit status. Ignore SIGPIPE from the
* parent-writer, as that only means that the utility chose to
* exit before reading all of its input.
*/
if (WIFSIGNALED(pstat) && (!okpipe || WTERMSIG(pstat) != SIGPIPE)) {
for (; isblank(*cmd); ++cmd);
p = msg_print(sp, cmd, &nf);
len = strlen(p);
msgq(sp, M_ERR, "%.*s%s: received signal: %s%s",
MINIMUM(len, 20), p, len > 20 ? " ..." : "",
strsignal(WTERMSIG(pstat)),
WCOREDUMP(pstat) ? "; core dumped" : "");
if (nf)
FREE_SPACE(sp, p, 0);
return (1);
}
if (WIFEXITED(pstat) && WEXITSTATUS(pstat)) {
/*
* Remain silent for "normal" errors when doing shell file
* name expansions, they almost certainly indicate nothing
* more than a failure to match.
*
* Remain silent for vi read filter errors. It's historic
* practice.
*/
if (!silent) {
for (; isblank(*cmd); ++cmd);
p = msg_print(sp, cmd, &nf);
len = strlen(p);
msgq(sp, M_ERR, "%.*s%s: exited with status %d",
MINIMUM(len, 20), p, len > 20 ? " ..." : "",
WEXITSTATUS(pstat));
if (nf)
FREE_SPACE(sp, p, 0);
}
return (1);
}
return (0);
}
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