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Luna/libs/libc/include/sys/mman.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 10:06:09 +00:00
#ifndef _SYS_MMAN_H
#define _SYS_MMAN_H
#include <stddef.h>
libc: Implement fseek(), ftell() and rewind() All three use the new syscall seek() (with its lseek() wrapper in unistd.h)!!
2022-10-12 13:56:03 +00:00
#include <sys/types.h> // for off_t
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
libc: Document functions in sys/mman.h
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/* Address returned by mmap when it fails. */
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! >.<
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#define MAP_FAILED (void*)-1
Avoid magic numbers
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#define PROT_READ_WRITE 1
Define PAGE_SIZE as 4096 and use it everywhere instead of using 4096 as a magic number
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#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
Kernel, libc: Round up to nearest page-aligned size instead of down
2022-10-12 10:15:12 +00:00
/* Maps size bytes of memory (rounded up to the nearest page-aligned size) into the current process's address
libc: Document functions in sys/mman.h
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* space at addr. If addr is null, the kernel will choose an address. */
void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset);
libc: Document sys/types.h
2022-10-12 10:07:42 +00:00
Kernel, libc: Round up to nearest page-aligned size instead of down
2022-10-12 10:15:12 +00:00
/* Unmaps size bytes of memory (rounded up to the nearest page-aligned size) at addr from the current process's
libc: Document functions in sys/mman.h
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* address space. */
int munmap(void* addr, size_t size);
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
}
#endif
#endif
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