UserspaceEmulator: Update virt$lseek and virt$ftruncate for 64bit off_t

The syscalls' prototypes were recently changed in preparation for 64bit
storage in serenity, so update them here as well :^)

2 files changed, 12 insertions, 6 deletions

diff --git a/Userland/DevTools/UserspaceEmulator/Emulator.h b/Userland/DevTools/UserspaceEmulator/Emulator.h
index 7f9976d851..35ad2ee7e5 100644
--- a/Userland/DevTools/UserspaceEmulator/Emulator.h
+++ b/Userland/DevTools/UserspaceEmulator/Emulator.h
@@ -148,7 +148,7 @@ private:
     u32 virt$fcntl(int fd, int, u32);
     int virt$getgroups(ssize_t count, FlatPtr);
     int virt$setgroups(ssize_t count, FlatPtr);
-    int virt$lseek(int fd, off_t offset, int whence);
+    int virt$lseek(int fd, FlatPtr offset_addr, int whence);
     int virt$socket(int, int, int);
     int virt$getsockopt(FlatPtr);
     int virt$setsockopt(FlatPtr);
@@ -184,7 +184,7 @@ private:
     u32 virt$allocate_tls(size_t);
     int virt$ptsname(int fd, FlatPtr buffer, size_t buffer_size);
     int virt$beep();
-    int virt$ftruncate(int fd, off_t);
+    int virt$ftruncate(int fd, FlatPtr length_addr);
     mode_t virt$umask(mode_t);
     int virt$anon_create(size_t, int);
     int virt$recvfd(int, int);
diff --git a/Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp b/Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp
index 9fc50f8bcb..61724c26bd 100644
--- a/Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp
+++ b/Userland/DevTools/UserspaceEmulator/Emulator_syscalls.cpp
@@ -457,9 +457,11 @@ int Emulator::virt$get_stack_bounds(FlatPtr base, FlatPtr size)
     return 0;
 }
 
-int Emulator::virt$ftruncate(int fd, off_t length)
+int Emulator::virt$ftruncate(int fd, FlatPtr length_addr)
 {
-    return syscall(SC_ftruncate, fd, length);
+    off_t length;
+    mmu().copy_from_vm(&length, length_addr, sizeof(off_t));
+    return syscall(SC_ftruncate, fd, &length);
 }
 
 mode_t Emulator::virt$umask(mode_t mask)
@@ -578,9 +580,13 @@ int Emulator::virt$set_process_name(FlatPtr user_buffer, int size)
     return syscall(SC_set_process_name, name.characters(), name.length());
 }
 
-int Emulator::virt$lseek(int fd, off_t offset, int whence)
+int Emulator::virt$lseek(int fd, FlatPtr offset_addr, int whence)
 {
-    return syscall(SC_lseek, fd, offset, whence);
+    off_t offset;
+    mmu().copy_from_vm(&offset, offset_addr, sizeof(off_t));
+    auto rc = syscall(SC_lseek, fd, &offset, whence);
+    mmu().copy_to_vm(offset_addr, &offset, sizeof(off_t));
+    return rc;
 }
 
 int Emulator::virt$socket(int domain, int type, int protocol)