Luna/kernel/include/errno.h

#pragma once

#define EPERM 1
#define ENOENT 2
#define EBADF 9
#define ENOMEM 12
#define EINVAL 22
#define EMFILE 24
#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			`#pragma once`

			`#define EPERM 1`
Kernel, libc, userspace: Implement file descriptors Kernel: Implement a descriptor struct which stores the opened node and read offset, and give each task 8 of those. Implement three syscalls: sys_read, sys_open and sys_close (sys_write still writes to the console instead of using a fd, for now) Implement three new errors: ENOENT, EBADF and EMFILE. libc: Implement the new errors, and the new syscalls in syscall(). Also fix _RETURN_WITH_ERRNO() to set errno correctly, which was making strerror() return null, thus crashing perror(). userspace: make init demonstrate the new file API. 2022-10-10 18:21:39 +00:00			`#define ENOENT 2`
			`#define EBADF 9`
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			`#define ENOMEM 12`
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 EINVAL 22`
Kernel, libc, userspace: Implement file descriptors Kernel: Implement a descriptor struct which stores the opened node and read offset, and give each task 8 of those. Implement three syscalls: sys_read, sys_open and sys_close (sys_write still writes to the console instead of using a fd, for now) Implement three new errors: ENOENT, EBADF and EMFILE. libc: Implement the new errors, and the new syscalls in syscall(). Also fix _RETURN_WITH_ERRNO() to set errno correctly, which was making strerror() return null, thus crashing perror(). userspace: make init demonstrate the new file API. 2022-10-10 18:21:39 +00:00			`#define EMFILE 24`
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`