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"tty.h" explanation? https://forum.osdev.org/viewtopic.php?f=1&t=33112 |
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Author: | RAYG11 [ Sat Aug 11, 2018 7:48 am ] |
Post subject: | "tty.h" explanation? |
Hello I was having a look at the "Meaty Skeleton" after building a basic cli style OS from the "Bare Bones" source. I understand almost all of it now apart from "tty.h": Code: #ifndef _KERNEL_TTY_H #define _KERNEL_TTY_H #include <stddef.h> void terminal_initialize(void); void terminal_putchar(char c); void terminal_write(const char* data, size_t size); void terminal_writestring(const char* data); #endif Where is the source for the four functions defined in "tty.h" located and what does the second line, #define _KERNEL_TTY_H, do? Thank you in advance |
Author: | iansjack [ Sat Aug 11, 2018 9:04 am ] |
Post subject: | Re: "tty.h" explanation? |
The functions are defined in tty.c. That line is there to prevent the include file from being included more than once. |
Author: | RAYG11 [ Sat Aug 11, 2018 9:10 am ] |
Post subject: | Re: "tty.h" explanation? |
iansjack wrote: The functions are defined in tty.c. That line is there to prevent the include file from being included more than once. hello thank you for the response. any idea where i can find "tty.c"? also do you know what effect "#define _KERNEL_TTY_H" is having? cheers |
Author: | iansjack [ Sat Aug 11, 2018 9:44 am ] |
Post subject: | Re: "tty.h" explanation? |
If you look at the list of source files you will see "kernel/arch/i386/tty.c". The #define line is used in conjunction with the #ifndef line. It's a very common construct in C header files. You should perhaps brush up on your knowledge of C and how include files are used before proceeding. |
Author: | RAYG11 [ Sat Aug 11, 2018 10:03 am ] |
Post subject: | Re: "tty.h" explanation? |
iansjack wrote: If you look at the list of source files you will see "kernel/arch/i386/tty.c". The #define line is used in conjunction with the #ifndef line. It's a very common construct in C header files. You should perhaps brush up on your knowledge of C and how include files are used before proceeding. i guess so. thanks anyway |
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