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Kernel/LibC: move file offset back to kernel 

This makes keeping track of offsets easier and more proper
This commit is contained in:
Bananymous 2023-05-16 14:14:47 +03:00
parent f33e78882e
commit 4a4a3bf184
10 changed files with 142 additions and 58 deletions
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2
LibELF/LibELF/ELF.cpp
View File

@ -25,7 +25,7 @@ namespace LibELF
TRY(data.resize(st.st_size));
TRY(Kernel::Process::current().read(fd, data.data(), 0, data.size()));
TRY(Kernel::Process::current().read(fd, data.data(), data.size()));
elf = new ELF(BAN::move(data));
ASSERT(elf);

10
kernel/include/kernel/Process.h
View File

@ -42,10 +42,13 @@ namespace Kernel
BAN::ErrorOr<int> open(BAN::StringView, int);
BAN::ErrorOr<void> close(int fd);
BAN::ErrorOr<size_t> read(int fd, void* buffer, size_t offset, size_t count);
BAN::ErrorOr<size_t> write(int fd, const void* buffer, size_t offset, size_t count);
BAN::ErrorOr<size_t> read(int fd, void* buffer, size_t count);
BAN::ErrorOr<size_t> write(int fd, const void* buffer, size_t count);
BAN::ErrorOr<void> creat(BAN::StringView name, mode_t);
BAN::ErrorOr<void> seek(int fd, off_t offset, int whence);
BAN::ErrorOr<off_t> tell(int fd);
BAN::ErrorOr<void> fstat(int fd, struct stat*);
BAN::ErrorOr<void> stat(BAN::StringView path, struct stat*);
@ -77,7 +80,8 @@ namespace Kernel
{
BAN::RefPtr<Inode> inode;
BAN::String path;
uint8_t flags = 0;
off_t offset { 0 };
uint8_t flags { 0 };
};
BAN::ErrorOr<void> validate_fd(int);

2
kernel/include/kernel/Syscall.h
View File

@ -8,6 +8,8 @@
#define SYS_OPEN 6
#define SYS_ALLOC 7
#define SYS_FREE 8
#define SYS_SEEK 9
#define SYS_TELL 10
#include <kernel/Attributes.h>
#include <stdint.h>

2
kernel/kernel/Font.cpp
View File

@ -45,7 +45,7 @@ namespace Kernel
BAN::Vector<uint8_t> file_data;
TRY(file_data.resize(st.st_size));
TRY(Process::current().read(fd, file_data.data(), 0, st.st_size));
TRY(Process::current().read(fd, file_data.data(), st.st_size));
if (file_data.size() < 4)
return BAN::Error::from_error_code(ErrorCode::Font_FileTooSmall);

66
kernel/kernel/Process.cpp
View File

@ -10,6 +10,7 @@
#include <LibELF/Values.h>
#include <fcntl.h>
#include <stdio.h>
namespace Kernel
{
@ -210,6 +211,7 @@ namespace Kernel
auto& open_file_description = m_open_files[fd];
open_file_description.inode = file.inode;
open_file_description.path = BAN::move(file.canonical_path);
open_file_description.offset = 0;
open_file_description.flags = flags;
return fd;
@ -224,7 +226,7 @@ namespace Kernel
return {};
}
BAN::ErrorOr<size_t> Process::read(int fd, void* buffer, size_t offset, size_t count)
BAN::ErrorOr<size_t> Process::read(int fd, void* buffer, size_t count)
{
OpenFileDescription open_fd_copy;
@ -236,10 +238,19 @@ namespace Kernel
if (!(open_fd_copy.flags & O_RDONLY))
return BAN::Error::from_errno(EBADF);
return TRY(open_fd_copy.inode->read(offset, buffer, count));
size_t nread = TRY(open_fd_copy.inode->read(open_fd_copy.offset, buffer, count));
{
LockGuard _(m_lock);
MUST(validate_fd(fd));
open_file_description(fd).offset += nread;
}
return nread;
}
BAN::ErrorOr<size_t> Process::write(int fd, const void* buffer, size_t offset, size_t count)
BAN::ErrorOr<size_t> Process::write(int fd, const void* buffer, size_t count)
{
OpenFileDescription open_fd_copy;
@ -251,7 +262,54 @@ namespace Kernel
if (!(open_fd_copy.flags & O_WRONLY))
return BAN::Error::from_errno(EBADF);
return TRY(open_fd_copy.inode->write(offset, buffer, count));
size_t nwrite = TRY(open_fd_copy.inode->write(open_fd_copy.offset, buffer, count));
{
LockGuard _(m_lock);
MUST(validate_fd(fd));
open_file_description(fd).offset += nwrite;
}
return nwrite;
}
BAN::ErrorOr<void> Process::seek(int fd, off_t offset, int whence)
{
LockGuard _(m_lock);
TRY(validate_fd(fd));
auto& open_fd = open_file_description(fd);
off_t new_offset = 0;
switch (whence)
{
case SEEK_CUR:
new_offset = open_fd.offset + offset;
break;
case SEEK_END:
new_offset = open_fd.inode->size() - offset;
break;
case SEEK_SET:
new_offset = offset;
break;
default:
return BAN::Error::from_errno(EINVAL);
}
if (new_offset < 0)
return BAN::Error::from_errno(EINVAL);
open_fd.offset = new_offset;
return {};
}
BAN::ErrorOr<off_t> Process::tell(int fd)
{
LockGuard _(m_lock);
TRY(validate_fd(fd));
return open_file_description(fd).offset;
}
BAN::ErrorOr<void> Process::creat(BAN::StringView path, mode_t mode)

18
kernel/kernel/Shell.cpp
View File

@ -22,14 +22,14 @@ namespace Kernel
static void TTY_PRINT(Args&&... args)
{
BAN::String message = BAN::String::formatted(BAN::forward<Args>(args)...);
MUST(Process::current().write(STDOUT_FILENO, message.data(), 0, message.size()));
MUST(Process::current().write(STDOUT_FILENO, message.data(), message.size()));
}
template<typename... Args>
static void TTY_PRINTLN(Args&&... args)
{
TTY_PRINT(BAN::forward<Args>(args)...);
MUST(Process::current().write(STDOUT_FILENO, "\n", 0, 1));
MUST(Process::current().write(STDOUT_FILENO, "\n", 1));
}
static auto s_default_prompt = "\\[\e[32m\\]user\\[\e[m\\]:\\[\e[34m\\]\\w\\[\e[m\\]# "sv;
@ -112,7 +112,7 @@ namespace Kernel
void Shell::run()
{
auto getch = [this] { uint8_t ch; MUST(Process::current().read(STDIN_FILENO, &ch, 0, 1)); return ch; };
auto getch = [this] { uint8_t ch; MUST(Process::current().read(STDIN_FILENO, &ch, 1)); return ch; };
MUST(m_buffer.push_back(""sv));
@ -130,7 +130,7 @@ namespace Kernel
while ((current.back() & 0xC0) == 0x80)
current.pop_back();
current.pop_back();
MUST(Process::current().write(STDOUT_FILENO, "\b \b", 0, 3));
MUST(Process::current().write(STDOUT_FILENO, "\b \b", 3));
}
continue;
}
@ -171,7 +171,7 @@ namespace Kernel
continue;
}
MUST(Process::current().write(STDOUT_FILENO, &ch, 0, 1));
MUST(Process::current().write(STDOUT_FILENO, &ch, 1));
if (ch != '\n')
{
@ -556,12 +556,8 @@ argument_done:
BAN::ScopeGuard buffer_guard([buffer] { delete[] buffer; });
ASSERT(buffer);
size_t offset = 0;
while (size_t n_read = TRY(Process::current().read(fd, buffer, offset, buffer_size)))
{
while (size_t n_read = TRY(Process::current().read(fd, buffer, buffer_size)))
TTY_PRINT("{}", BAN::StringView(buffer, n_read));
offset += n_read;
}
TTY_PRINTLN("");
}
else if (arguments.front() == "stat")
@ -639,7 +635,7 @@ argument_done:
while (true)
{
size_t n_read = TRY(Process::current().read(fd, buffer, total_read, buffer_size));
size_t n_read = TRY(Process::current().read(fd, buffer, buffer_size));
if (n_read == 0)
break;
for (size_t j = 0; j < n_read; j++)

38
kernel/kernel/Syscall.cpp
View File

@ -10,17 +10,17 @@ namespace Kernel
Process::current().exit();
}
long sys_read(int fd, void* buffer, size_t offset, size_t size)
long sys_read(int fd, void* buffer, size_t size)
{
auto res = Process::current().read(fd, buffer, offset, size);
auto res = Process::current().read(fd, buffer, size);
if (res.is_error())
return -res.error().get_error_code();
return res.value();
}
long sys_write(int fd, const void* buffer, size_t offset, size_t size)
long sys_write(int fd, const void* buffer, size_t size)
{
auto res = Process::current().write(fd, buffer, offset, size);
auto res = Process::current().write(fd, buffer, size);
if (res.is_error())
return -res.error().get_error_code();
return res.value();
@ -60,12 +60,32 @@ namespace Kernel
Process::current().free(ptr);
}
long sys_seek(int fd, long offset, int whence)
{
auto res = Process::current().seek(fd, offset, whence);
if (res.is_error())
return -res.error().get_error_code();
return 0;
}
long sys_tell(int fd)
{
auto res = Process::current().tell(fd);
if (res.is_error())
return -res.error().get_error_code();
return res.value();
}
extern "C" long cpp_syscall_handler(int syscall, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3, uintptr_t arg4, uintptr_t arg5)
{
Thread::current().set_in_syscall(true);
asm volatile("sti");
(void)arg1;
(void)arg2;
(void)arg3;
(void)arg4;
(void)arg5;
long ret = 0;
@ -75,10 +95,10 @@ namespace Kernel
sys_exit();
break;
case SYS_READ:
ret = sys_read((int)arg1, (void*)arg2, (size_t)arg3, (size_t)arg4);
ret = sys_read((int)arg1, (void*)arg2, (size_t)arg3);
break;
case SYS_WRITE:
ret = sys_write((int)arg1, (const void*)arg2, (size_t)arg3, (size_t)arg4);
ret = sys_write((int)arg1, (const void*)arg2, (size_t)arg3);
break;
case SYS_TERMID:
sys_termid((char*)arg1);
@ -95,6 +115,12 @@ namespace Kernel
case SYS_FREE:
sys_free((void*)arg1);
break;
case SYS_SEEK:
ret = sys_seek((int)arg1, (long)arg2, (int)arg3);
break;
case SYS_TELL:
ret = sys_tell((int)arg1);
break;
default:
Kernel::panic("Unknown syscall {}", syscall);
}

2
kernel/kernel/Terminal/TTY.cpp
View File

@ -66,7 +66,7 @@ namespace Kernel
while (true)
{
Input::KeyEvent event;
ASSERT(MUST(Process::current().read(fd, &event, 0, sizeof(event))) == sizeof(event));
ASSERT(MUST(Process::current().read(fd, &event, sizeof(event))) == sizeof(event));
TTY::current()->on_key(event);
}
}, nullptr

46
libc/stdio.cpp
View File

@ -10,7 +10,6 @@
struct FILE
{
int fd { -1 };
off_t offset { 0 };
bool eof { false };
bool error { false };
@ -77,7 +76,7 @@ int fflush(FILE* file)
if (file->buffer_index == 0)
return 0;
if (syscall(SYS_WRITE, file->fd, file->buffer, file->offset, file->buffer_index) < 0)
if (syscall(SYS_WRITE, file->fd, file->buffer, file->buffer_index) < 0)
{
file->error = true;
return EOF;
@ -93,7 +92,7 @@ int fgetc(FILE* file)
return EOF;
unsigned char c;
long ret = syscall(SYS_READ, file->fd, &c, file->offset, 1);
long ret = syscall(SYS_READ, file->fd, &c, 1);
if (ret < 0)
{
@ -107,13 +106,15 @@ int fgetc(FILE* file)
return EOF;
}
file->offset++;
return c;
}
int fgetpos(FILE* file, fpos_t* pos)
{
*pos = file->offset;
off_t offset = ftello(file);
if (offset == -1)
return -1;
*pos = offset;
return 0;
}
@ -214,7 +215,6 @@ int fprintf(FILE* file, const char* format, ...)
int fputc(int c, FILE* file)
{
file->buffer[file->buffer_index++] = c;
file->offset++;
if (c == '\n' || file->buffer_index == sizeof(file->buffer))
if (fflush(file) == EOF)
return EOF;
@ -236,15 +236,14 @@ size_t fread(void* buffer, size_t size, size_t nitems, FILE* file)
{
if (file->eof || nitems * size == 0)
return 0;
long ret = syscall(SYS_READ, file->fd, buffer, file->offset, size * nitems);
long ret = syscall(SYS_READ, file->fd, buffer, size * nitems);
if (ret < 0)
{
file->error = true;
return 0;
}
if (ret < size * nitems)
if (ret == 0)
file->eof = true;
file->offset += ret;
return ret / size;
}
@ -261,29 +260,11 @@ int fseek(FILE* file, long offset, int whence)
int fseeko(FILE* file, off_t offset, int whence)
{
if (offset < 0)
{
errno = EINVAL;
long ret = syscall(SYS_SEEK, file->fd, offset, whence);
if (ret < 0)
return -1;
}
if (whence == SEEK_CUR && offset <= file->offset)
file->offset += offset;
else if (whence == SEEK_SET)
file->offset = offset;
else if (whence == SEEK_END)
{
errno = ENOTSUP;
return -1;
}
else
{
errno = EINVAL;
return -1;
}
file->eof = false;
return 0;
}
@ -299,7 +280,10 @@ long ftell(FILE* file)
off_t ftello(FILE* file)
{
return file->offset;
long ret = syscall(SYS_TELL, file->fd);
if (ret < 0)
return -1;
return ret;
}
// TODO

14
libc/unistd.cpp
View File

@ -76,6 +76,20 @@ long syscall(long syscall, ...)
ret = Kernel::syscall(SYS_FREE, (uintptr_t)ptr);
break;
}
case SYS_SEEK:
{
int fd = va_arg(args, int);
off_t offset = va_arg(args, off_t);
int whence = va_arg(args, int);
ret = Kernel::syscall(SYS_SEEK, fd, offset, whence);
break;
}
case SYS_TELL:
{
int fd = va_arg(args, int);
ret = Kernel::syscall(SYS_TELL, fd);
break;
}
default:
puts("LibC: Unhandeled syscall");
ret = -ENOSYS;