mirror of
https://github.com/sheumann/hush.git
synced 2024-12-28 22:30:05 +00:00
104 lines
2.4 KiB
C
104 lines
2.4 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini watch implementation for busybox
|
|
*
|
|
* Copyright (C) 2001 by Michael Habermann <mhabermann@gmx.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*/
|
|
|
|
/* getopt not needed */
|
|
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/wait.h>
|
|
#include "busybox.h"
|
|
|
|
extern int watch_main(int argc, char **argv)
|
|
{
|
|
const char date_argv[2][10] = { "date", "" };
|
|
const int header_len = 40;
|
|
char header[header_len + 1];
|
|
int period = 2;
|
|
char **cargv;
|
|
int cargc;
|
|
pid_t pid;
|
|
int old_stdout;
|
|
int i;
|
|
|
|
if (argc < 2) {
|
|
show_usage();
|
|
} else {
|
|
cargv = argv + 1;
|
|
cargc = argc - 1;
|
|
|
|
/* don't use getopt, because it permutes the arguments */
|
|
if (argc >= 3 && !strcmp(argv[1], "-n")) {
|
|
period = strtol(argv[2], NULL, 10);
|
|
if (period < 1)
|
|
show_usage();
|
|
cargv += 2;
|
|
cargc -= 2;
|
|
}
|
|
}
|
|
|
|
|
|
/* create header */
|
|
snprintf(header, header_len, "Every %ds: ", period);
|
|
for (i = 0; i < cargc && (strlen(header) + strlen(cargv[i]) < header_len);
|
|
i++) {
|
|
strcat(header, cargv[i]);
|
|
strcat(header, " ");
|
|
}
|
|
|
|
/* fill with blanks */
|
|
for (i = strlen(header); i < header_len; i++)
|
|
header[i] = ' ';
|
|
|
|
header[header_len - 1] = '\0';
|
|
|
|
|
|
/* thanks to lye, who showed me how to redirect stdin/stdout */
|
|
old_stdout = dup(1);
|
|
|
|
while (1) {
|
|
printf("\033[H\033[J%s", header);
|
|
date_main(1, (char **) date_argv);
|
|
printf("\n");
|
|
|
|
pid = vfork(); /* vfork, because of ucLinux */
|
|
if (pid > 0) {
|
|
//parent
|
|
wait(0);
|
|
sleep(period);
|
|
} else if (0 == pid) {
|
|
//child
|
|
close(1);
|
|
dup(old_stdout);
|
|
if (execvp(*cargv, cargv))
|
|
error_msg_and_die("Couldn't run command\n");
|
|
} else {
|
|
error_msg_and_die("Couldn't vfork\n");
|
|
}
|
|
}
|
|
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|