From 99f3cc26c3e69b0ad7f104cd20189cd6fd4c3cf1 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Mon, 8 Apr 2019 23:44:12 +0200
Subject: [PATCH] Kernel+LibC: Add stubs for POSIX shared memory API.

Specifically shm_open() and shm_unlink(). This patch just adds stubs.
---
 Kernel/Process.cpp | 14 ++++++++++++++
 Kernel/Process.h   |  2 ++
 Kernel/Syscall.cpp |  4 ++++
 Kernel/Syscall.h   |  2 ++
 LibC/mman.cpp      | 12 ++++++++++++
 LibC/mman.h        |  2 ++
 6 files changed, 36 insertions(+)

diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
index 9638f6399b4..9c7612ed4db 100644
--- a/Kernel/Process.cpp
+++ b/Kernel/Process.cpp
@@ -2454,3 +2454,17 @@ int Process::sys$rename(const char* oldpath, const char* newpath)
         return -EFAULT;
     return VFS::the().rename(String(oldpath), String(newpath), cwd_inode());
 }
+
+int Process::sys$shm_open(const char* name, int flags, mode_t mode)
+{
+    if (!validate_read_str(name))
+        return -EFAULT;
+    return -ENOTIMPL;
+}
+
+int Process::sys$shm_unlink(const char* name)
+{
+    if (!validate_read_str(name))
+        return -EFAULT;
+    return -ENOTIMPL;
+}
diff --git a/Kernel/Process.h b/Kernel/Process.h
index 14b5328cdc5..135fa7edcb5 100644
--- a/Kernel/Process.h
+++ b/Kernel/Process.h
@@ -99,6 +99,8 @@ public:
 
     int sys$gettid();
     int sys$donate(int tid);
+    int sys$shm_open(const char* name, int flags, mode_t);
+    int sys$shm_unlink(const char* name);
     pid_t sys$setsid();
     pid_t sys$getsid(pid_t);
     int sys$setpgid(pid_t pid, pid_t pgid);
diff --git a/Kernel/Syscall.cpp b/Kernel/Syscall.cpp
index cbba530e9b8..812cc7d8288 100644
--- a/Kernel/Syscall.cpp
+++ b/Kernel/Syscall.cpp
@@ -243,6 +243,10 @@ static dword handle(RegisterDump& regs, dword function, dword arg1, dword arg2,
         return current->process().sys$create_thread((int(*)(void*))arg1, (void*)arg2);
     case Syscall::SC_rename:
         return current->process().sys$rename((const char*)arg1, (const char*)arg2);
+    case Syscall::SC_shm_open:
+        return current->process().sys$shm_open((const char*)arg1, (int)arg2, (mode_t)arg3);
+    case Syscall::SC_shm_close:
+        return current->process().sys$shm_unlink((const char*)arg1);
     default:
         kprintf("<%u> int0x82: Unknown function %u requested {%x, %x, %x}\n", current->process().pid(), function, arg1, arg2, arg3);
         break;
diff --git a/Kernel/Syscall.h b/Kernel/Syscall.h
index f609e165532..b11a079d1e9 100644
--- a/Kernel/Syscall.h
+++ b/Kernel/Syscall.h
@@ -96,6 +96,8 @@
     __ENUMERATE_SYSCALL(gettid) \
     __ENUMERATE_SYSCALL(donate) \
     __ENUMERATE_SYSCALL(rename) \
+    __ENUMERATE_SYSCALL(shm_open) \
+    __ENUMERATE_SYSCALL(shm_close) \
 
 
 namespace Syscall {
diff --git a/LibC/mman.cpp b/LibC/mman.cpp
index 8cba6f83af7..174643712ba 100644
--- a/LibC/mman.cpp
+++ b/LibC/mman.cpp
@@ -28,4 +28,16 @@ int set_mmap_name(void* addr, size_t size, const char* name)
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }
 
+int shm_open(const char* name, int flags, mode_t mode)
+{
+    int rc = syscall(SC_shm_open, name, flags, mode);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int shm_unlink(const char* name)
+{
+    int rc = syscall(SC_unlink, name);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
 }
diff --git a/LibC/mman.h b/LibC/mman.h
index a2a6ca372c6..0defe16763b 100644
--- a/LibC/mman.h
+++ b/LibC/mman.h
@@ -21,6 +21,8 @@ __BEGIN_DECLS
 void* mmap(void* addr, size_t, int prot, int flags, int fd, off_t);
 int munmap(void*, size_t);
 int set_mmap_name(void*, size_t, const char*);
+int shm_open(const char* name, int flags, mode_t);
+int shm_unlink(const char* name);
 
 __END_DECLS