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/*
* (c) Copyright 1990, Kim Fabricius Storm. All rights reserved.
* Copyright (c) 1996-2005 Michael T Pins. All rights reserved.
*
* UNIX command execution.
*/
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <sys/wait.h>
#include <string.h>
#include "config.h"
#include "global.h"
#include "execute.h"
#include "folder.h"
#include "nn_term.h"
/* execute.c */
static int shell_check(void);
int shell_restrictions = 0; /* disable shell escapes */
static char *init_shell = SHELL;
char *user_shell;
char *exec_chdir_to = NULL;
extern int errno;
static int
shell_check(void)
{
if (shell_restrictions) {
msg("Restricted operation - not allowed");
return -1;
}
return 0;
}
void
init_execute(void)
{
if ((user_shell = getenv("SHELL")) == NULL)
user_shell = SHELL;
}
int
execute(char *path, char **args, int toggle_visual)
{
int was_raw, pid, i, status;
sig_type(*quit) (), (*intr) (), (*tstp) ();
was_raw = toggle_visual ? visual_off() : unset_raw();
while ((pid = fork()) == -1)
sleep(1);
if (pid == 0) {
for (i = 3; i < 20; i++)
close(i);
if (exec_chdir_to != NULL)
chdir(exec_chdir_to);
if (execvp(path, args)) {
msg("%s: %s", path, strerror(errno));
user_delay(2);
exit(20);
}
}
quit = signal(SIGQUIT, SIG_IGN);
intr = signal(SIGINT, SIG_IGN);
#ifdef HAVE_JOBCONTROL
tstp = signal(SIGTSTP, SIG_DFL);
#endif
while ((i = wait(&status)) != pid && (i != -1 || errno == EINTR));
signal(SIGQUIT, quit);
signal(SIGINT, intr);
#ifdef HAVE_JOBCONTROL
signal(SIGTSTP, tstp);
#endif
if (toggle_visual) {
visual_on();
if (toggle_visual == 2)
s_redraw++;
}
if (was_raw)
nn_raw();
return (status & 0xff) ? 0x100 : (status >> 8);
}
int
shell_escape(void)
{
static char command[FILENAME] = "";
char *cmd;
int first = 1;
if (shell_check())
return 0;
for (;;) {
prompt("\1!\1");
cmd = get_s(command, NONE, NONE, NULL_FCT);
if (cmd == NULL)
return !first;
if (*cmd == NUL) {
if (first)
run_shell((char *) NULL, 1, 0);
return 1;
}
strcpy(command, cmd);
if (run_shell(command, first, 0) < 0)
return !first;
first = 0;
prompt_line = -1;
}
}
static char *exec_sh_args[] = {
"nnsh",
(char *) NULL, /* "-c" or "-i" */
(char *) NULL, /* cmdstring */
(char *) NULL
};
int
run_shell(char *command, int clear, int init_sh)
/*
* clear -2 => no command output (:!!command) - keep visual, output
* before command: -1 => none, 0 => CR/NL, 1 => clear
*/
/* init_sh 0 => use user_shell, else use init_shell */
{
char cmdstring[512];
if (shell_check())
return -1;
if (command != NULL) {
if (!expand_file_name(cmdstring, command, 1))
return -1;
exec_sh_args[1] = "-c";
exec_sh_args[2] = cmdstring;
} else {
exec_sh_args[1] = "-i";
exec_sh_args[2] = NULL;
}
if (clear > 0) {
clrdisp();
fl;
} else if (clear == 0) {
tputc(CR);
tputc(NL);
}
return execute(init_sh ? init_shell : user_shell,
exec_sh_args, clear == -2 ? 0 : 1);
}
#ifndef HAVE_JOBCONTROL
static char *exec_suspend_args[] = {
"nnsh",
"-i",
(char *) NULL
};
#endif
int
suspend_nn(void)
{
int was_raw;
if (shell_check())
return 0;
gotoxy(0, Lines - 1);
clrline();
#ifdef HAVE_JOBCONTROL
was_raw = visual_off();
kill(process_id, SIGSTOP);
visual_on();
s_redraw++;
if (was_raw)
nn_raw();
#else
execute(user_shell, exec_suspend_args, 2);
#endif
return 1;
}
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