Watch applet by Michael Habermann

git-svn-id: svn://busybox.net/trunk/busybox@5513 69ca8d6d-28ef-0310-b511-8ec308f3f277
author: bug1 <bug1@69ca8d6d-28ef-0310-b511-8ec308f3f277> 2002-09-16 09:10:04 +0000
committer: bug1 <bug1@69ca8d6d-28ef-0310-b511-8ec308f3f277> 2002-09-16 09:10:04 +0000
commit: 54cf79dd4a5fb8091181129e2b13b382e49744a3 (patch)
tree: a43358d389b2e594341e993c7a86d44369244423 /coreutils
parent: 153698e364ef609d40053a7465b0485428e4ff71 (diff)
download: busybox-w32-54cf79dd4a5fb8091181129e2b13b382e49744a3.tar.gz
busybox-w32-54cf79dd4a5fb8091181129e2b13b382e49744a3.tar.bz2
busybox-w32-54cf79dd4a5fb8091181129e2b13b382e49744a3.zip
1 files changed, 104 insertions, 0 deletions
diff --git a/coreutils/watch.c b/coreutils/watch.c
new file mode 100644
index 000000000..78ede4c1c
--- /dev/null
+++ b/coreutils/watch.c
@@ -0,0 +1,104 @@
+/* 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 "busybox.h"
+extern int watch_main(int argc, char **argv)
+{
+        const char date_argv[2][10] = { "date", "" };
+        const char clrscr[] =
+                "\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n";
+        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("%s%s", clrscr, 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;
+}
author	bug1 <bug1@69ca8d6d-28ef-0310-b511-8ec308f3f277>	2002-09-16 09:10:04 +0000
committer	bug1 <bug1@69ca8d6d-28ef-0310-b511-8ec308f3f277>	2002-09-16 09:10:04 +0000
commit	54cf79dd4a5fb8091181129e2b13b382e49744a3 (patch)
tree	a43358d389b2e594341e993c7a86d44369244423 /coreutils
parent	153698e364ef609d40053a7465b0485428e4ff71 (diff)
download	busybox-w32-54cf79dd4a5fb8091181129e2b13b382e49744a3.tar.gz busybox-w32-54cf79dd4a5fb8091181129e2b13b382e49744a3.tar.bz2 busybox-w32-54cf79dd4a5fb8091181129e2b13b382e49744a3.zip

diff --git a/coreutils/watch.c b/coreutils/watch.c new file mode 100644 index 000000000..78ede4c1c --- /dev/null +++ b/coreutils/watch.c
@@ -0,0 +1,104 @@
	1	/* vi: set sw=4 ts=4: */
	2	/*
	3	* Mini watch implementation for busybox
	4	*
	5	* Copyright (C) 2001 by Michael Habermann <mhabermann@gmx.de>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	*/
	22
	23	/* getopt not needed */
	24
	25	#include <stdio.h>
	26	#include <errno.h>
	27	#include <unistd.h>
	28	#include <stdlib.h>
	29	#include <string.h>
	30	#include "busybox.h"
	31
	32	extern int watch_main(int argc, char **argv)
	33	{
	34	const char date_argv[2][10] = { "date", "" };
	35	const char clrscr[] =
	36	"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n";
	37	const int header_len = 40;
	38	char header[header_len + 1];
	39	int period = 2;
	40	char **cargv;
	41	int cargc;
	42	pid_t pid;
	43	int old_stdout;
	44	int i;
	45
	46	if (argc < 2) {
	47	show_usage();
	48	} else {
	49	cargv = argv + 1;
	50	cargc = argc - 1;
	51
	52	/* don't use getopt, because it permutes the arguments */
	53	if (argc >= 3 && !strcmp(argv[1], "-n")) {
	54	period = strtol(argv[2], NULL, 10);
	55	if (period < 1)
	56	show_usage();
	57	cargv += 2;
	58	cargc -= 2;
	59	}
	60	}
	61
	62
	63	/* create header */
	64	snprintf(header, header_len, "Every %ds: ", period);
	65	for (i = 0; i < cargc && (strlen(header) + strlen(cargv[i]) < header_len);
	66	i++) {
	67	strcat(header, cargv[i]);
	68	strcat(header, " ");
	69	}
	70
	71	/* fill with blanks */
	72	for (i = strlen(header); i < header_len; i++)
	73	header[i] = ' ';
	74
	75	header[header_len - 1] = '\0';
	76
	77
	78	/* thanks to lye, who showed me how to redirect stdin/stdout */
	79	old_stdout = dup(1);
	80
	81	while (1) {
	82	printf("%s%s", clrscr, header);
	83	date_main(1, (char **) date_argv);
	84	printf("\n");
	85
	86	pid = vfork(); /* vfork, because of ucLinux */
	87	if (pid > 0) {
	88	//parent
	89	wait(0);
	90	sleep(period);
	91	} else if (0 == pid) {
	92	//child
	93	close(1);
	94	dup(old_stdout);
	95	if (execvp(*cargv, cargv))
	96	error_msg_and_die("Couldn't run command\n");
	97	} else {
	98	error_msg_and_die("Couldn't vfork\n");
	99	}
	100	}
	101
	102
	103	return EXIT_SUCCESS;
	104	}