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Kernel/LibC: Implement pwrite and make pread non-locking

This commit is contained in:
Bananymous 2025-05-20 20:29:42 +03:00
parent 5d80c880c8
commit 44b762f916
4 changed files with 21 additions and 8 deletions
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1
kernel/include/kernel/Process.h
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@ -112,6 +112,7 @@ namespace Kernel
BAN::ErrorOr<long> sys_symlinkat(const char* path1, int fd, const char* path2);
BAN::ErrorOr<long> sys_pread(int fd, void* buffer, size_t count, off_t offset);
BAN::ErrorOr<long> sys_pwrite(int fd, const void* buffer, size_t count, off_t offset);
BAN::ErrorOr<long> sys_fchmodat(int fd, const char* path, mode_t mode, int flag);
BAN::ErrorOr<long> sys_fchownat(int fd, const char* path, uid_t uid, gid_t gid, int flag);

22
kernel/kernel/Process.cpp
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@ -1192,17 +1192,23 @@ namespace Kernel
BAN::ErrorOr<long> Process::sys_pread(int fd, void* buffer, size_t count, off_t offset)
{
LockGuard _(m_process_lock);
if (count == 0)
{
TRY(m_open_file_descriptors.inode_of(fd));
return 0;
}
TRY(validate_pointer_access(buffer, count, true));
auto inode = TRY(m_open_file_descriptors.inode_of(fd));
return TRY(inode->read(offset, { (uint8_t*)buffer, count }));
auto* buffer_region = TRY(validate_and_pin_pointer_access(buffer, count, true));
BAN::ScopeGuard _([buffer_region]{ if (buffer_region) buffer_region->unpin(); });
return TRY(inode->read(offset, { reinterpret_cast<uint8_t*>(buffer), count }));
}
BAN::ErrorOr<long> Process::sys_pwrite(int fd, const void* buffer, size_t count, off_t offset)
{
auto inode = TRY(m_open_file_descriptors.inode_of(fd));
auto* buffer_region = TRY(validate_and_pin_pointer_access(buffer, count, false));
BAN::ScopeGuard _([buffer_region]{ if (buffer_region) buffer_region->unpin(); });
return TRY(inode->write(offset, { reinterpret_cast<const uint8_t*>(buffer), count })); }
BAN::ErrorOr<long> Process::sys_fchmodat(int fd, const char* path, mode_t mode, int flag)
{
if (mode & S_IFMASK)

1
userspace/libraries/LibC/include/sys/syscall.h
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@ -60,6 +60,7 @@ __BEGIN_DECLS
O(SYS_READLINKAT, readlinkat) \
O(SYS_MSYNC, msync) \
O(SYS_PREAD, pread) \
O(SYS_PWRITE, pwrite) \
O(SYS_FCHOWNAT, fchownat) \
O(SYS_LOAD_KEYMAP, load_keymap) \
O(SYS_SOCKET, socket) \

5
userspace/libraries/LibC/unistd.cpp
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@ -127,6 +127,11 @@ ssize_t pread(int fildes, void* buf, size_t nbyte, off_t offset)
return syscall(SYS_PREAD, fildes, buf, nbyte, offset);
}
ssize_t pwrite(int fildes, const void* buf, size_t nbyte, off_t offset)
{
return syscall(SYS_PWRITE, fildes, buf, nbyte, offset);
}
off_t lseek(int fildes, off_t offset, int whence)
{
return syscall(SYS_SEEK, fildes, offset, whence);