Convert utility.c into libbb.a. It is now a whole pile of .c

files. Clean up the resulting damage and fix up the makefile. -Erik
author: Eric Andersen <andersen@codepoet.org> 2001-03-16 22:47:14 +0000
committer: Eric Andersen <andersen@codepoet.org> 2001-03-16 22:47:14 +0000
commit: aad1a88c76f208d188fd061e3723bd637437e8d5 (patch)
tree: 75ac2b994f7f04af776e93eeedba82b873ff557e /libbb/get_console.c
parent: dfba13d199bb58d802df99c1ef20fdc0d628e86d (diff)
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1 files changed, 129 insertions, 0 deletions
diff --git a/libbb/get_console.c b/libbb/get_console.c
new file mode 100644
index 000000000..4be9adc84
--- /dev/null
+++ b/libbb/get_console.c
@@ -0,0 +1,129 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) tons of folks.  Tracking down who wrote what
+ * isn't something I'm going to worry about...  If you wrote something
+ * here, please feel free to acknowledge your work.
+ *
+ * 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
+ *
+ * Based in part on code from sash, Copyright (c) 1999 by David I. Bell 
+ * Permission has been granted to redistribute this code under the GPL.
+ *
+ */
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include "libbb.h"
+/* From <linux/kd.h> */ 
+static const int KDGKBTYPE = 0x4B33;  /* get keyboard type */
+static const int KB_84 = 0x01;
+static const int KB_101 = 0x02;    /* this is what we always answer */
+int is_a_console(int fd)
+{
+        char arg;
+        arg = 0;
+        return (ioctl(fd, KDGKBTYPE, &arg) == 0
+                        && ((arg == KB_101) || (arg == KB_84)));
+}
+static int open_a_console(char *fnam)
+{
+        int fd;
+        /* try read-only */
+        fd = open(fnam, O_RDWR);
+        /* if failed, try read-only */
+        if (fd < 0 && errno == EACCES)
+                fd = open(fnam, O_RDONLY);
+        /* if failed, try write-only */
+        if (fd < 0 && errno == EACCES)
+                fd = open(fnam, O_WRONLY);
+        /* if failed, fail */
+        if (fd < 0)
+                return -1;
+        /* if not a console, fail */
+        if (!is_a_console(fd)) {
+                close(fd);
+                return -1;
+        }
+        /* success */
+        return fd;
+}
+/*
+ * Get an fd for use with kbd/console ioctls.
+ * We try several things because opening /dev/console will fail
+ * if someone else used X (which does a chown on /dev/console).
+ *
+ * if tty_name is non-NULL, try this one instead.
+ */
+int get_console_fd(char *tty_name)
+{
+        int fd;
+        if (tty_name) {
+                if (-1 == (fd = open_a_console(tty_name)))
+                        return -1;
+                else
+                        return fd;
+        }
+        fd = open_a_console("/dev/tty");
+        if (fd >= 0)
+                return fd;
+        fd = open_a_console("/dev/tty0");
+        if (fd >= 0)
+                return fd;
+        fd = open_a_console("/dev/console");
+        if (fd >= 0)
+                return fd;
+        for (fd = 0; fd < 3; fd++)
+                if (is_a_console(fd))
+                        return fd;
+        error_msg("Couldnt get a file descriptor referring to the console");
+        return -1;                                      /* total failure */
+}
+/* END CODE */
+/*
+Local Variables:
+c-file-style: "linux"
+c-basic-offset: 4
+tab-width: 4
+End:
+*/
author	Eric Andersen <andersen@codepoet.org>	2001-03-16 22:47:14 +0000
committer	Eric Andersen <andersen@codepoet.org>	2001-03-16 22:47:14 +0000
commit	aad1a88c76f208d188fd061e3723bd637437e8d5 (patch)
tree	75ac2b994f7f04af776e93eeedba82b873ff557e /libbb/get_console.c
parent	dfba13d199bb58d802df99c1ef20fdc0d628e86d (diff)
download	busybox-w32-aad1a88c76f208d188fd061e3723bd637437e8d5.tar.gz busybox-w32-aad1a88c76f208d188fd061e3723bd637437e8d5.tar.bz2 busybox-w32-aad1a88c76f208d188fd061e3723bd637437e8d5.zip

diff --git a/libbb/get_console.c b/libbb/get_console.c new file mode 100644 index 000000000..4be9adc84 --- /dev/null +++ b/libbb/get_console.c
@@ -0,0 +1,129 @@
	1	/* vi: set sw=4 ts=4: */
	2	/*
	3	* Utility routines.
	4	*
	5	* Copyright (C) tons of folks. Tracking down who wrote what
	6	* isn't something I'm going to worry about... If you wrote something
	7	* here, please feel free to acknowledge your work.
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	22	*
	23	* Based in part on code from sash, Copyright (c) 1999 by David I. Bell
	24	* Permission has been granted to redistribute this code under the GPL.
	25	*
	26	*/
	27
	28	#include <stdio.h>
	29	#include <errno.h>
	30	#include <fcntl.h>
	31	#include <unistd.h>
	32	#include <sys/ioctl.h>
	33	#include "libbb.h"
	34
	35
	36
	37
	38
	39	/* From <linux/kd.h> */
	40	static const int KDGKBTYPE = 0x4B33; /* get keyboard type */
	41	static const int KB_84 = 0x01;
	42	static const int KB_101 = 0x02; /* this is what we always answer */
	43
	44	int is_a_console(int fd)
	45	{
	46	char arg;
	47
	48	arg = 0;
	49	return (ioctl(fd, KDGKBTYPE, &arg) == 0
	50	&& ((arg == KB_101) \|\| (arg == KB_84)));
	51	}
	52
	53	static int open_a_console(char *fnam)
	54	{
	55	int fd;
	56
	57	/* try read-only */
	58	fd = open(fnam, O_RDWR);
	59
	60	/* if failed, try read-only */
	61	if (fd < 0 && errno == EACCES)
	62	fd = open(fnam, O_RDONLY);
	63
	64	/* if failed, try write-only */
	65	if (fd < 0 && errno == EACCES)
	66	fd = open(fnam, O_WRONLY);
	67
	68	/* if failed, fail */
	69	if (fd < 0)
	70	return -1;
	71
	72	/* if not a console, fail */
	73	if (!is_a_console(fd)) {
	74	close(fd);
	75	return -1;
	76	}
	77
	78	/* success */
	79	return fd;
	80	}
	81
	82	/*
	83	* Get an fd for use with kbd/console ioctls.
	84	* We try several things because opening /dev/console will fail
	85	* if someone else used X (which does a chown on /dev/console).
	86	*
	87	* if tty_name is non-NULL, try this one instead.
	88	*/
	89
	90	int get_console_fd(char *tty_name)
	91	{
	92	int fd;
	93
	94	if (tty_name) {
	95	if (-1 == (fd = open_a_console(tty_name)))
	96	return -1;
	97	else
	98	return fd;
	99	}
	100
	101	fd = open_a_console("/dev/tty");
	102	if (fd >= 0)
	103	return fd;
	104
	105	fd = open_a_console("/dev/tty0");
	106	if (fd >= 0)
	107	return fd;
	108
	109	fd = open_a_console("/dev/console");
	110	if (fd >= 0)
	111	return fd;
	112
	113	for (fd = 0; fd < 3; fd++)
	114	if (is_a_console(fd))
	115	return fd;
	116
	117	error_msg("Couldnt get a file descriptor referring to the console");
	118	return -1; /* total failure */
	119	}
	120
	121
	122	/* END CODE */
	123	/*
	124	Local Variables:
	125	c-file-style: "linux"
	126	c-basic-offset: 4
	127	tab-width: 4
	128	End:
	129	*/