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Fix compile error and reducing size for libbb/get_console.c to previous size.

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Vodz last_patch106
This commit is contained in:
Glenn L McGrath
2003-09-01 08:53:32 +00:00
parent d9461f887e
commit 005f83adf5
2 changed files with 26 additions and 44 deletions
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66
libbb/get_console.c
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@@ -2,8 +2,8 @@
/*
* Utility routines.
*
* Copyright (C) many different people.
* If you wrote this, please acknowledge your work.
* Copyright (C) many different people. If you wrote this, please
* 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
@@ -29,27 +29,15 @@
/* 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 */
static 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)
static int open_a_console(const char *fnam)
{
int fd;
/* try read-only */
/* try read-write */
fd = open(fnam, O_RDWR);
/* if failed, try read-only */
@@ -60,17 +48,6 @@ static int open_a_console(char *fnam)
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;
}
@@ -78,32 +55,37 @@ static int open_a_console(char *fnam)
* 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(void)
{
int fd;
fd = open_a_console(CURRENT_TTY);
if (fd >= 0)
return fd;
static const char * const choise_console_names[] = {
CONSOLE_DEV, CURRENT_VC, CURRENT_TTY
};
fd = open_a_console(CURRENT_VC);
if (fd >= 0)
return fd;
for (fd = 2; fd >= 0; fd--) {
int fd4name;
int choise_fd;
char arg;
fd = open_a_console(CONSOLE_DEV);
if (fd >= 0)
return fd;
fd4name = open_a_console(choise_console_names[fd]);
chk_std:
choise_fd = fd4name >= 0 ? fd4name : fd;
for (fd = 0; fd < 3; fd++)
if (is_a_console(fd))
return fd;
arg = 0;
if (ioctl(choise_fd, KDGKBTYPE, &arg) == 0)
return choise_fd;
if(fd4name >= 0) {
close(fd4name);
fd4name = -1;
goto chk_std;
}
}
bb_error_msg("Couldn't get a file descriptor referring to the console");
return -1; /* total failure */
return fd; /* total failure */
}