399d2b5c24
another... This adds bb_xspawn() support, which does vfork/exec. (I don't know why using a static instead of a local adds ~40 bytes, but using the local doesn't work...)
69 lines
1.4 KiB
C
69 lines
1.4 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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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* BB_AUDIT SUSv3 N/A */
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/* BB_AUDIT GNU defects -- only option -n is supported. */
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Removed dependency on date_main(), added proper error checking, and
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* reduced size.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <time.h>
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#include <assert.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include "busybox.h"
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int watch_main(int argc, char **argv)
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{
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int width, len;
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unsigned period = 2;
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char **watched_argv, *header;
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if (argc < 2) bb_show_usage();
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get_terminal_width_height(1, &width, 0);
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header = xzalloc(width--);
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/* don't use getopt, because it permutes the arguments */
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++argv;
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if ((argc > 3) && !strcmp(*argv, "-n")) {
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period = bb_xgetularg10_bnd(argv[1], 1, UINT_MAX);
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argv += 2;
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}
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watched_argv = argv;
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/* create header */
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len = snprintf(header, width, "Every %ds:", period);
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while (*argv && len<width)
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snprintf(header+len, width-len, " %s", *(argv++));
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while (1) {
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char *thyme;
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time_t t;
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time(&t);
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thyme = ctime(&t);
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len = strlen(thyme);
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if (len < width) header[width-len] = 0;
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printf("\033[H\033[J%s %s\n", header, thyme);
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waitpid(bb_xspawn(watched_argv),0,0);
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sleep(period);
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}
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}
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