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