LibC: Add functions for the new statvfs syscalls

This commit adds the statvfs() and fstatvfs() functions into LibC.

Userland/Libraries/LibC/CMakeLists.txt

@@ -46,6 +46,7 @@ set(LIBC_SOURCES
     sys/socket.cpp
     sys/uio.cpp
     sys/wait.cpp
+    sys/statvfs.cpp
     termcap.cpp
     termios.cpp
     time.cpp

Userland/Libraries/LibC/sys/statvfs.cpp

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2021, Justin Mietzner <sw1tchbl4d3@sw1tchbl4d3.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <errno.h>
+#include <string.h>
+#include <sys/statvfs.h>
+#include <syscall.h>
+
+extern "C" {
+
+int statvfs(const char* path, struct statvfs* buf)
+{
+    Syscall::SC_statvfs_params params { { path, strlen(path) }, buf };
+    int rc = syscall(SC_statvfs, &params);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int fstatvfs(int fd, struct statvfs* buf)
+{
+    int rc = syscall(SC_fstatvfs, fd, buf);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+}

Userland/Libraries/LibC/sys/statvfs.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2021, Justin Mietzner <sw1tchbl4d3@sw1tchbl4d3.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+#define ST_RDONLY 0x1
+#define ST_NOSUID 0x2
+
+struct statvfs {
+    unsigned long f_bsize;
+    unsigned long f_frsize;
+    fsblkcnt_t f_blocks;
+    fsblkcnt_t f_bfree;
+    fsblkcnt_t f_bavail;
+
+    fsfilcnt_t f_files;
+    fsfilcnt_t f_ffree;
+    fsfilcnt_t f_favail;
+
+    unsigned long f_fsid;
+    unsigned long f_flag;
+    unsigned long f_namemax;
+};
+
+int statvfs(const char* path, struct statvfs* buf);
+int fstatvfs(int fd, struct statvfs* buf);
+
+__END_DECLS