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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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42a359e31a
Cleanup of the SIGWINCH support. Some code and comment reformatting. The stack used for SIGWINCH threads was leaked. This is now fixed by storing it with the pid and other information, and freeing it when the thread is killed. If something goes wrong with a WIGWINCH thread, and this is discovered in the interrupt handler, the winch record would leak. It is now freed, except that the IRQ isn't freed. This is hard to do from interrupt context. This has the side-effect that the IRQ system maintains a reference to the freed structure, but that shouldn't cause a problem since the descriptor is disabled. register_winch_irq is now much better about cleaning up after an initialization failure. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/*
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* Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#ifndef __CHAN_USER_H__
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#define __CHAN_USER_H__
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#include "init.h"
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struct chan_opts {
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void (*const announce)(char *dev_name, int dev);
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char *xterm_title;
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const int raw;
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};
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enum chan_init_pri { INIT_STATIC, INIT_ALL, INIT_ONE };
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struct chan_ops {
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char *type;
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void *(*init)(char *, int, const struct chan_opts *);
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int (*open)(int, int, int, void *, char **);
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void (*close)(int, void *);
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int (*read)(int, char *, void *);
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int (*write)(int, const char *, int, void *);
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int (*console_write)(int, const char *, int);
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int (*window_size)(int, void *, unsigned short *, unsigned short *);
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void (*free)(void *);
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int winch;
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};
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extern const struct chan_ops fd_ops, null_ops, port_ops, pts_ops, pty_ops,
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tty_ops, xterm_ops;
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extern void generic_close(int fd, void *unused);
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extern int generic_read(int fd, char *c_out, void *unused);
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extern int generic_write(int fd, const char *buf, int n, void *unused);
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extern int generic_console_write(int fd, const char *buf, int n);
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extern int generic_window_size(int fd, void *unused, unsigned short *rows_out,
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unsigned short *cols_out);
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extern void generic_free(void *data);
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struct tty_struct;
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extern void register_winch(int fd, struct tty_struct *tty);
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extern void register_winch_irq(int fd, int tty_fd, int pid,
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struct tty_struct *tty, unsigned long stack);
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#define __channel_help(fn, prefix) \
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__uml_help(fn, prefix "[0-9]*=<channel description>\n" \
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" Attach a console or serial line to a host channel. See\n" \
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" http://user-mode-linux.sourceforge.net/input.html for a complete\n" \
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" description of this switch.\n\n" \
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);
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#endif
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