Kernel: Add anonymous files, created with sys$anon_create()

This patch adds a new AnonymousFile class which is a File backed by
an AnonymousVMObject that can only be mmap'ed and nothing else, really.

I'm hoping that this can become a replacement for shbufs. :^)

2 files changed, 8 insertions, 0 deletions

diff --git a/Userland/Libraries/LibC/serenity.cpp b/Userland/Libraries/LibC/serenity.cpp
index 626a464ee8..3168a39d4c 100644
--- a/Userland/Libraries/LibC/serenity.cpp
+++ b/Userland/Libraries/LibC/serenity.cpp
@@ -136,4 +136,10 @@ int get_stack_bounds(uintptr_t* user_stack_base, size_t* user_stack_size)
     int rc = syscall(SC_get_stack_bounds, user_stack_base, user_stack_size);
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }
+
+int anon_create(size_t size, int options)
+{
+    int rc = syscall(SC_anon_create, size, options);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
 }
diff --git a/Userland/Libraries/LibC/serenity.h b/Userland/Libraries/LibC/serenity.h
index 4654476469..16f370e27b 100644
--- a/Userland/Libraries/LibC/serenity.h
+++ b/Userland/Libraries/LibC/serenity.h
@@ -73,6 +73,8 @@ int perf_event(int type, uintptr_t arg1, uintptr_t arg2);
 
 int get_stack_bounds(uintptr_t* user_stack_base, size_t* user_stack_size);
 
+int anon_create(size_t size, int options);
+
 #ifdef __i386__
 ALWAYS_INLINE void send_secret_data_to_userspace_emulator(uintptr_t data1, uintptr_t data2, uintptr_t data3)
 {