Luna/libs/libc/include/sys/mman.h

#ifndef _SYS_MMAN_H
#define _SYS_MMAN_H

#include <stddef.h>

typedef unsigned long off_t;

#define MAP_FAILED (void*)-1

#define PROT_READ_WRITE 1

#define PAGE_SIZE 4096

#ifdef __cplusplus
extern "C"
{
#endif

    void* mmap(void*, size_t, int, int, int, off_t);
    int munmap(void* addr, size_t len);

#ifdef __cplusplus
}
#endif

#endif
Kernel, libc and userspace: Add basic errno support. Kernel: Add an errno.h header with definitions for each header, and return those, negated, from syscalls when there is an error. mmap() returns an invalid address with errno encoded, instead of returning a negated errno; this address is encoded as ffffffffffffffEE where EE is errno in hex. libc: make syscall() return -1 and set errno on error, instead of returning the raw return value of the system call. Also, add mmap() and munmap() wrappers in sys/mman.h :). userspace: make the memeater program show the value of errno when allocating memory fails. Things to improve: add perror() and strerror() to make the errno experience even better! >.< 2022-10-08 10:06:09 +00:00			`#ifndef _SYS_MMAN_H`
			`#define _SYS_MMAN_H`

			`#include <stddef.h>`

			`typedef unsigned long off_t;`

			`#define MAP_FAILED (void*)-1`

Avoid magic numbers 2022-10-08 12:44:48 +00:00			`#define PROT_READ_WRITE 1`

Define PAGE_SIZE as 4096 and use it everywhere instead of using 4096 as a magic number 2022-10-08 12:52:28 +00:00			`#define PAGE_SIZE 4096`

Kernel, libc and userspace: Add basic errno support. Kernel: Add an errno.h header with definitions for each header, and return those, negated, from syscalls when there is an error. mmap() returns an invalid address with errno encoded, instead of returning a negated errno; this address is encoded as ffffffffffffffEE where EE is errno in hex. libc: make syscall() return -1 and set errno on error, instead of returning the raw return value of the system call. Also, add mmap() and munmap() wrappers in sys/mman.h :). userspace: make the memeater program show the value of errno when allocating memory fails. Things to improve: add perror() and strerror() to make the errno experience even better! >.< 2022-10-08 10:06:09 +00:00			`#ifdef __cplusplus`
			`extern "C"`
			`{`
			`#endif`

			`void* mmap(void*, size_t, int, int, int, off_t);`
			`int munmap(void* addr, size_t len);`

			`#ifdef __cplusplus`
			`}`
			`#endif`

			`#endif`