forked from Bananymous/banan-os
update main #1
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@ -101,6 +101,9 @@ namespace Kernel
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BAN::ErrorOr<long> sys_create(const char*, mode_t);
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BAN::ErrorOr<long> sys_create_dir(const char*, mode_t);
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BAN::ErrorOr<long> sys_unlink(const char*);
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BAN::ErrorOr<long> readlink_impl(BAN::StringView absolute_path, char* buffer, size_t bufsize);
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BAN::ErrorOr<long> sys_readlink(const char* path, char* buffer, size_t bufsize);
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BAN::ErrorOr<long> sys_readlinkat(int fd, const char* path, char* buffer, size_t bufsize);
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BAN::ErrorOr<long> sys_chmod(const char*, mode_t);
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@ -782,6 +782,47 @@ namespace Kernel
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return 0;
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}
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BAN::ErrorOr<long> Process::readlink_impl(BAN::StringView absolute_path, char* buffer, size_t bufsize)
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{
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auto inode = TRY(VirtualFileSystem::get().file_from_absolute_path(m_credentials, absolute_path, O_NOFOLLOW | O_RDONLY)).inode;
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// FIXME: no allocation needed
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auto link_target = TRY(inode->link_target());
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size_t byte_count = BAN::Math::min<size_t>(link_target.size(), bufsize);
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memcpy(buffer, link_target.data(), byte_count);
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return byte_count;
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}
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BAN::ErrorOr<long> Process::sys_readlink(const char* path, char* buffer, size_t bufsize)
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{
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LockGuard _(m_lock);
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validate_string_access(path);
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validate_pointer_access(buffer, bufsize);
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auto absolute_path = TRY(absolute_path_of(path));
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return readlink_impl(absolute_path.sv(), buffer, bufsize);
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}
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BAN::ErrorOr<long> Process::sys_readlinkat(int fd, const char* path, char* buffer, size_t bufsize)
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{
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LockGuard _(m_lock);
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validate_string_access(path);
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validate_pointer_access(buffer, bufsize);
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// FIXME: handle O_SEARCH in fd
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auto parent_path = TRY(m_open_file_descriptors.path_of(fd));
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BAN::String absolute_path;
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TRY(absolute_path.append(parent_path));
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TRY(absolute_path.push_back('/'));
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TRY(absolute_path.append(path));
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return readlink_impl(absolute_path.sv(), buffer, bufsize);
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}
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BAN::ErrorOr<long> Process::sys_chmod(const char* path, mode_t mode)
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{
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if (mode & S_IFMASK)
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@ -211,6 +211,12 @@ namespace Kernel
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case SYS_UNLINK:
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ret = Process::current().sys_unlink((const char*)arg1);
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break;
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case SYS_READLINK:
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ret = Process::current().sys_readlink((const char*)arg1, (char*)arg2, (size_t)arg3);
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break;
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case SYS_READLINKAT:
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ret = Process::current().sys_readlinkat((int)arg1, (const char*)arg2, (char*)arg3, (size_t)arg4);
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break;
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default:
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dwarnln("Unknown syscall {}", syscall);
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break;
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@ -59,6 +59,8 @@ __BEGIN_DECLS
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#define SYS_CREATE 56 // creat, mkfifo
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#define SYS_CREATE_DIR 57 // mkdir
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#define SYS_UNLINK 58
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#define SYS_READLINK 59
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#define SYS_READLINKAT 60
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__END_DECLS
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@ -78,6 +78,16 @@ ssize_t write(int fildes, const void* buf, size_t nbyte)
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return syscall(SYS_WRITE, fildes, buf, nbyte);
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}
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ssize_t readlink(const char* __restrict path, char* __restrict buf, size_t bufsize)
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{
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return syscall(SYS_READLINK, path, buf, bufsize);
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}
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ssize_t readlinkat(int fd, const char* __restrict path, char* __restrict buf, size_t bufsize)
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{
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return syscall(SYS_READLINKAT, fd, path, buf, bufsize);
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}
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int dup(int fildes)
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{
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return syscall(SYS_DUP, fildes);
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