Release 4.7 drivers/s390/char/ctrlchar.c

/*
 *  Unified handling of special chars.
 *
 *    Copyright IBM Corp. 2001
 *    Author(s): Fritz Elfert <felfert@millenux.com> <elfert@de.ibm.com>
 *
 */

#include <linux/stddef.h>
#include <asm/errno.h>
#include <linux/sysrq.h>
#include <linux/ctype.h>

#include "ctrlchar.h"

#ifdef CONFIG_MAGIC_SYSRQ

static struct sysrq_work ctrlchar_sysrq;


static void

ctrlchar_handle_sysrq(struct work_struct *work)
{
	struct sysrq_work *sysrq = container_of(work, struct sysrq_work, work);

	handle_sysrq(sysrq->key);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
hendrik brueckner
hendrik brueckner
18
54.55%
1
33.33%
linus torvalds
linus torvalds
12
36.36%
1
33.33%
andrew morton
andrew morton
3
9.09%
1
33.33%
Total
33
100.00%
3
100.00%



void schedule_sysrq_work(struct sysrq_work *sw)
{
	INIT_WORK(&sw->work, ctrlchar_handle_sysrq);
	schedule_work(&sw->work);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
hendrik brueckner
hendrik brueckner
23
82.14%
1
33.33%
martin schwidefsky
martin schwidefsky
3
10.71%
1
33.33%
linus torvalds
linus torvalds
2
7.14%
1
33.33%
Total
28
100.00%
3
100.00%

#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];
		schedule_sysrq_work(&ctrlchar_sysrq);
		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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
112
70.89%
1
25.00%
martin schwidefsky
martin schwidefsky
41
25.95%
2
50.00%
hendrik brueckner
hendrik brueckner
5
3.16%
1
25.00%
Total
158
100.00%
4
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
142
57.72%
1
14.29%
martin schwidefsky
martin schwidefsky
51
20.73%
3
42.86%
hendrik brueckner
hendrik brueckner
49
19.92%
1
14.29%
andrew morton
andrew morton
3
1.22%
1
14.29%
heiko carstens
heiko carstens
1
0.41%
1
14.29%
Total
246
100.00%
7
100.00%
  
Directory: drivers/s390/char

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.