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Kernel: Add support for mkfifo{,at} mkdir at

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Opening FIFOs still dont work as expected but at least you can create
them now :D
This commit is contained in:
Bananymous
2026-05-18 22:35:20 +03:00
parent 6d1ecc2388
commit 1922d78661
4 changed files with 35 additions and 18 deletions
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3
kernel/include/kernel/Process.h
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@@ -106,7 +106,8 @@ namespace Kernel
BAN::ErrorOr<long> sys_read(int fd, void* buffer, size_t count);
BAN::ErrorOr<long> sys_write(int fd, const void* buffer, size_t count);
BAN::ErrorOr<long> sys_access(const char* path, int amode);
BAN::ErrorOr<long> sys_create_dir(const char*, mode_t);
BAN::ErrorOr<long> sys_mkdirat(int fd, const char* path, mode_t);
BAN::ErrorOr<long> sys_mkfifoat(int fd, const char* path, mode_t);
BAN::ErrorOr<long> sys_hardlinkat(int fd1, const char* path1, int fd2, const char* path2, int flag);
BAN::ErrorOr<long> sys_renameat(int oldfd, const char* old, int newfd, const char* _new);
BAN::ErrorOr<long> sys_unlinkat(int fd, const char* path, int flag);

28
kernel/kernel/Process.cpp
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@@ -1302,7 +1302,7 @@ namespace Kernel
return 0;
}
BAN::ErrorOr<long> Process::sys_create_dir(const char* user_path, mode_t mode)
BAN::ErrorOr<long> Process::sys_mkdirat(int fd, const char* user_path, mode_t mode)
{
char path[PATH_MAX];
TRY(read_string_from_user(user_path, path, PATH_MAX));
@@ -1313,12 +1313,29 @@ namespace Kernel
uid_gid_t { m_credentials.euid(), m_credentials.egid() };
});
auto [parent, file_name] = TRY(find_parent_file(AT_FDCWD, path, O_WRONLY));
auto [parent, file_name] = TRY(find_parent_file(fd, path, O_WRONLY));
TRY(parent.inode->create_directory(file_name, (mode & 0777) | Inode::Mode::IFDIR, uid, gid));
return 0;
}
BAN::ErrorOr<long> Process::sys_mkfifoat(int fd, const char* user_path, mode_t mode)
{
char path[PATH_MAX];
TRY(read_string_from_user(user_path, path, PATH_MAX));
struct uid_gid_t { uid_t uid; gid_t gid; };
const auto [uid, gid] = ({
LockGuard _(m_process_lock);
uid_gid_t { m_credentials.euid(), m_credentials.egid() };
});
auto [parent, file_name] = TRY(find_parent_file(fd, path, O_WRONLY));
TRY(parent.inode->create_file(file_name, (mode & 0777) | Inode::Mode::IFIFO, uid, gid));
return 0;
}
BAN::ErrorOr<long> Process::sys_hardlinkat(int fd1, const char* user_path1, int fd2, const char* user_path2, int flag)
{
char path1[PATH_MAX];
@@ -1415,12 +1432,11 @@ namespace Kernel
TRY(read_string_from_user(user_path1, path1, PATH_MAX));
char path2[PATH_MAX];
if (user_path2 != nullptr)
TRY(read_string_from_user(user_path2, path2, PATH_MAX));
TRY(read_string_from_user(user_path2, path2, PATH_MAX));
TRY(create_file(fd, user_path2 ? path2 : nullptr, 0777 | Inode::Mode::IFLNK));
TRY(create_file(fd, path2, 0777 | Inode::Mode::IFLNK));
auto symlink = TRY(find_file(fd, user_path2 ? path2 : nullptr, O_NOFOLLOW));
auto symlink = TRY(find_file(fd, path2, O_NOFOLLOW));
TRY(symlink.inode->set_link_target(path1));
return 0;

3
userspace/libraries/LibC/include/sys/syscall.h
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@@ -52,7 +52,8 @@ __BEGIN_DECLS
O(SYS_TTY_CTRL, tty_ctrl) \
O(SYS_POWEROFF, poweroff) \
O(SYS_FCHMODAT, fchmodat) \
O(SYS_CREATE_DIR, create_dir) \
O(SYS_MKDIRAT, mkdirat) \
O(SYS_MKFIFOAT, mkfifoat) \
O(SYS_UNLINKAT, unlinkat) \
O(SYS_READLINKAT, readlinkat) \
O(SYS_MSYNC, msync) \

19
userspace/libraries/LibC/sys/stat.cpp
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@@ -52,28 +52,27 @@ mode_t umask(mode_t cmask)
int mkdir(const char* path, mode_t mode)
{
return syscall(SYS_CREATE_DIR, path, __UMASKED_MODE(mode));
return mkdirat(AT_FDCWD, path, mode);
}
int mkdirat(int fd, const char* path, mode_t mode)
{
return syscall(SYS_MKDIRAT, fd, path, __UMASKED_MODE(mode));
}
int mkfifo(const char* path, mode_t mode)
{
(void)path; (void)mode;
dwarnln("TODO: mkfifo");
return -1;
return mkfifoat(AT_FDCWD, path, mode);
}
int mkfifoat(int fd, const char* path, mode_t mode)
{
(void)fd; (void)path; (void)mode;
dwarnln("TODO: mkfifoat");
return -1;
return syscall(SYS_MKFIFOAT, fd, path, __UMASKED_MODE(mode));
}
int mknod(const char* path, mode_t mode, dev_t dev)
{
(void)path; (void)mode; (void)dev;
dwarnln("TODO: mknod");
return -1;
return mknodat(AT_FDCWD, path, mode, dev);
}
int mknodat(int fd, const char* path, mode_t mode, dev_t dev)