Luna/libs/libc/include/errno.h

#ifndef _ERRNO_H
#define _ERRNO_H

extern int errno;

#define EPERM 1
#define ENOMEM 12
#define EINVAL 22
#define ENOSYS 38

#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 _ERRNO_H`
			`#define _ERRNO_H`

			`extern int errno;`

			`#define EPERM 1`
			`#define ENOMEM 12`
			`#define EINVAL 22`
Kernel, libc: Add ENOSYS This error is returned by the kernel/C Library when an attempt is made to use a system call that doesn't exist. 2022-10-08 12:18:25 +00:00			`#define ENOSYS 38`
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
			`#endif`