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Luna/libs/libc/include/bits/error.h

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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 12:06:09 +02:00
#ifndef _BITS_ERROR_H
#define _BITS_ERROR_H
#include <errno.h>
#define _RETURN_WITH_ERRNO(rc, type) \
do { \
if (rc < 0) \
{ \
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 20:21:39 +02:00
errno = (int)(-rc); \
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 12:06:09 +02:00
return -1; \
} \
libc: Implement the start of a FILE* API (the standard, portable C way of doing file stuff)
2022-10-10 21:08:57 +02:00
errno = 0; \
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 12:06:09 +02:00
return (type)rc; \
} while (0)
#define _RETURN_WITH_MEMORY_ERRNO(rc, type) \
do { \
if ((unsigned long int)rc > 0xffffffffffffff00) \
{ \
errno = (int)((rc)&0xff); \
return (type)-1; \
} \
libc: Implement the start of a FILE* API (the standard, portable C way of doing file stuff)
2022-10-10 21:08:57 +02:00
errno = 0; \
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 12:06:09 +02:00
return (type)rc; \
} while (0)
#endif
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