From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/s390/char/ctrlchar.c | 75 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 drivers/s390/char/ctrlchar.c (limited to 'drivers/s390/char/ctrlchar.c') diff --git a/drivers/s390/char/ctrlchar.c b/drivers/s390/char/ctrlchar.c new file mode 100644 index 00000000000..be463242cf0 --- /dev/null +++ b/drivers/s390/char/ctrlchar.c @@ -0,0 +1,75 @@ +/* + * drivers/s390/char/ctrlchar.c + * Unified handling of special chars. + * + * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation + * Author(s): Fritz Elfert + * + */ + +#include +#include +#include +#include +#include + +#include "ctrlchar.h" + +#ifdef CONFIG_MAGIC_SYSRQ +static int ctrlchar_sysrq_key; + +static void +ctrlchar_handle_sysrq(void *tty) +{ + handle_sysrq(ctrlchar_sysrq_key, NULL, (struct tty_struct *) tty); +} + +static DECLARE_WORK(ctrlchar_work, ctrlchar_handle_sysrq, 0); +#endif + + +/** + * Check for special chars at start of input. + * + * @param buf Console input buffer. + * @param len Length of valid data in buffer. + * @param tty The tty struct for this console. + * @return CTRLCHAR_NONE, if nothing matched, + * CTRLCHAR_SYSRQ, if sysrq was encountered + * otherwise char to be inserted logically or'ed + * with CTRLCHAR_CTRL + */ +unsigned int +ctrlchar_handle(const unsigned char *buf, int len, struct tty_struct *tty) +{ + if ((len < 2) || (len > 3)) + return CTRLCHAR_NONE; + + /* hat is 0xb1 in codepage 037 (US etc.) and thus */ + /* converted to 0x5e in ascii ('^') */ + if ((buf[0] != '^') && (buf[0] != '\252')) + return CTRLCHAR_NONE; + +#ifdef CONFIG_MAGIC_SYSRQ + /* racy */ + if (len == 3 && buf[1] == '-') { + ctrlchar_sysrq_key = buf[2]; + ctrlchar_work.data = tty; + schedule_work(&ctrlchar_work); + return CTRLCHAR_SYSRQ; + } +#endif + + if (len != 2) + return CTRLCHAR_NONE; + + switch (tolower(buf[1])) { + case 'c': + return INTR_CHAR(tty) | CTRLCHAR_CTRL; + case 'd': + return EOF_CHAR(tty) | CTRLCHAR_CTRL; + case 'z': + return SUSP_CHAR(tty) | CTRLCHAR_CTRL; + } + return CTRLCHAR_NONE; +} -- cgit v1.2.3