Codice

292 volume VI os16
Script e sorgenti del kernel 293
1960030 |void tty_init (void);
1960031 |
1960032 |#endif
1990029 |}
104.10.4 kernel/tty/tty_reference.c
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104.10.1 kernel/tty/tty_console.c
Si veda la sezione 103.9.
1970001 |#include
1970002 |#include
1970003 |//----------------------------------------------------------------------
1970004 |dev_t
1970005 |tty_console (dev_t device)
1970006 |{
1970007 | static dev_t device_active = DEV_CONSOLE0; // First time.
1970008 | dev_t device_previous;
1970009 | //
1970010 | // Check if it required only the current device.
1970011 | //
1970012 | if (device == 0)
1970013 | {
1970014 | return (device_active);
1970015 | }
1970016 | //
1970017 | // Fix if the device is not valid.
1970018 | //
1970019 | if (device > DEV_CONSOLE3 || device < DEV_CONSOLE0)
1970020 | {
1970021 | device = DEV_CONSOLE0;
1970022 | }
1970023 | //
1970024 | // Update.
1970025 | //
1970026 | device_previous = device_active;
1970027 | device_active = device;
1970028 | //
1970029 | // Switch.
1970030 | //
1970031 | con_select (device_active & 0x00FF);
1970032 | //
1970033 | // Return previous device value.
1970034 | //
1970035 | return (device_previous);
1970036 |}
104.10.2 kernel/tty/tty_init.c
Si veda la sezione 103.9.
2000001 |#include
2000002 |//----------------------------------------------------------------------
2000003 |tty_t *
2000004 |tty_reference (dev_t device)
2000005 |{
2000006 | int t; // Terminal index.
2000007 | //
2000008 | // If device is zero, a reference to the whole table is returned.
2000009 | //
2000010 | if (device == 0)
2000011 | {
2000012 | return (tty_table);
2000013 | }
2000014 | //
2000015 | // Otherwise, a scan is made to find the selected device.
2000016 | //
2000017 | for (t = 0; t < TTYS_TOTAL; t++)
2000018 | {
2000019 | if (tty_table[t].device == device)
2000020 | {
2000021 | //
2000022 | // Device found. Return the pointer.
2000023 | //
2000024 | return (&tty_table[t]);
2000025 | }
2000026 | }
2000027 | //
2000028 | // No device found!
2000029 | //
2000030 | return (NULL);
2000031 |}
104.10.5 kernel/tty/tty_table.c
Si veda la sezione 103.9.
2010001 |#include
2010002 |//----------------------------------------------------------------------
2010003 |tty_t tty_table[TTYS_TOTAL];
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«
«
Si veda la sezione 103.9.
104.10.6 kernel/tty/tty_write.c
1980001 |#include
1980002 |#include
1980003 |//----------------------------------------------------------------------
1980004 |void
1980005 |tty_init (void)
1980006 |{
1980007 | int page; // console page.
1980008 | //
1980009 | // Console initialization: console pages correspond to the first
1980010 | // terminal items.
1980011 | //
1980012 | for (page = 0; page < TTYS_CONSOLE; page++)
1980013 | {
1980014 | tty_table[page].device = DEV_CONSOLE0 + page;
1980015 | tty_table[page].pgrp = 0;
1980016 | tty_table[page].key = 0;
1980017 | tty_table[page].status = TTY_OK;
1980018 | }
1980019 | //
1980020 | // Set video mode.
1980021 | //
1980022 | con_init ();
1980023 | //
1980024 | // Select the first console.
1980025 | //
1980026 | tty_console (DEV_CONSOLE0);
1980027 | //
1980028 | // Nothing else to configure (only consoles are available).
1980029 | //
1980030 | return;
1980031 |}
Si veda la sezione 103.9.
2020001 |#include
2020002 |#include
2020003 |//----------------------------------------------------------------------
2020004 |void
2020005 |tty_write (dev_t device, int c)
2020006 |{
2020007 | int console;
2020008 | //
2020009 | if ((device & 0xFF00) == (DEV_CONSOLE_MAJOR key;
1990023 | tty->key = 0;
1990024 | //
1990025 | // Return the key.
1990026 | //
1990027 | return (key);
1990028 |