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81af8d67d4
This is such a rare path it took me a while to figure out how to test this after soring out the locking. This patch does several things. - The variables used are moved into a structure and declared in vt_kern.h - A spinlock is added so we don't have SMP races updating the values. - Instead of raw pid_t value a struct_pid is used to guard against pid wrap around issues, if the daemon to spawn a new console dies. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
95 lines
3.2 KiB
C
95 lines
3.2 KiB
C
#ifndef _VT_KERN_H
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#define _VT_KERN_H
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/*
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* this really is an extension of the vc_cons structure in console.c, but
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* with information needed by the vt package
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*/
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#include <linux/vt.h>
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#include <linux/kd.h>
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#include <linux/tty.h>
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#include <linux/console_struct.h>
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#include <linux/mm.h>
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/*
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* Presently, a lot of graphics programs do not restore the contents of
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* the higher font pages. Defining this flag will avoid use of them, but
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* will lose support for PIO_FONTRESET. Note that many font operations are
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* not likely to work with these programs anyway; they need to be
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* fixed. The linux/Documentation directory includes a code snippet
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* to save and restore the text font.
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*/
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#ifdef CONFIG_VGA_CONSOLE
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#define BROKEN_GRAPHICS_PROGRAMS 1
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#endif
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extern void kd_mksound(unsigned int hz, unsigned int ticks);
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extern int kbd_rate(struct kbd_repeat *rep);
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extern int fg_console, last_console, want_console;
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/* console.c */
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int vc_allocate(unsigned int console);
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int vc_cons_allocated(unsigned int console);
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int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines);
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int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines);
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void vc_deallocate(unsigned int console);
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void reset_palette(struct vc_data *vc);
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void do_blank_screen(int entering_gfx);
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void do_unblank_screen(int leaving_gfx);
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void unblank_screen(void);
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void poke_blanked_console(void);
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int con_font_op(struct vc_data *vc, struct console_font_op *op);
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int con_set_cmap(unsigned char __user *cmap);
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int con_get_cmap(unsigned char __user *cmap);
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void scrollback(struct vc_data *vc, int lines);
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void scrollfront(struct vc_data *vc, int lines);
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void update_region(struct vc_data *vc, unsigned long start, int count);
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void redraw_screen(struct vc_data *vc, int is_switch);
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#define update_screen(x) redraw_screen(x, 0)
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#define switch_screen(x) redraw_screen(x, 1)
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struct tty_struct;
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int tioclinux(struct tty_struct *tty, unsigned long arg);
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/* consolemap.c */
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struct unimapinit;
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struct unipair;
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int con_set_trans_old(unsigned char __user * table);
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int con_get_trans_old(unsigned char __user * table);
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int con_set_trans_new(unsigned short __user * table);
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int con_get_trans_new(unsigned short __user * table);
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int con_clear_unimap(struct vc_data *vc, struct unimapinit *ui);
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int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list);
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int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct unipair __user *list);
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int con_set_default_unimap(struct vc_data *vc);
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void con_free_unimap(struct vc_data *vc);
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void con_protect_unimap(struct vc_data *vc, int rdonly);
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int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc);
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/* vt.c */
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int vt_waitactive(int vt);
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void change_console(struct vc_data *new_vc);
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void reset_vc(struct vc_data *vc);
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/*
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* vc_screen.c shares this temporary buffer with the console write code so that
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* we can easily avoid touching user space while holding the console spinlock.
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*/
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#define CON_BUF_SIZE (CONFIG_BASE_SMALL ? 256 : PAGE_SIZE)
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extern char con_buf[CON_BUF_SIZE];
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extern struct semaphore con_buf_sem;
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struct vt_spawn_console {
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spinlock_t lock;
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struct pid *pid;
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int sig;
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};
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extern struct vt_spawn_console vt_spawn_con;
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#endif /* _VT_KERN_H */
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