From 69dafab7a17d600826ce10e36526bbb807a09a4d Mon Sep 17 00:00:00 2001
From: Joshua Saxby <joshua.a.saxby@gmail.com>
Date: Tue, 3 Dec 2019 09:04:21 +0000
Subject: [PATCH] Add skeleton of new write system call
---
Makefile.build | 1 +
userprog/syscall.c | 4 +++-
userprog/syscall_write.c | 12 ++++++++++++
userprog/system_calls.h | 7 +++++++
4 files changed, 23 insertions(+), 1 deletion(-)
create mode 100644 userprog/syscall_write.c
diff --git a/Makefile.build b/Makefile.build
index 30d709b..2fb7073 100644
--- a/Makefile.build
+++ b/Makefile.build
@@ -67,6 +67,7 @@ userprog_SRC += userprog/syscall_exit.c
userprog_SRC += userprog/syscall_halt.c
userprog_SRC += userprog/syscall_wait.c
userprog_SRC += userprog/syscall_create.c
+userprog_SRC += userprog/syscall_write.c
# No virtual memory code yet.
#vm_SRC = vm/file.c # Some file.
diff --git a/userprog/syscall.c b/userprog/syscall.c
index c78175f..24a2654 100644
--- a/userprog/syscall.c
+++ b/userprog/syscall.c
@@ -70,9 +70,11 @@ syscall_handler (struct intr_frame *f UNUSED)
case SYSCALL_CREATE:
syscall_create(f);
break;
+ case SYSCALL_WRITE:
+ syscall_write(f);
+ break;
default:
printf ("WARNING: Invalid Syscall (%d)\n", syscall_number);
thread_exit ();
}
- // TODO: remove this call to exit as we don't want all syscalls to make the thread exit
}
diff --git a/userprog/syscall_write.c b/userprog/syscall_write.c
new file mode 100644
index 0000000..cf476a7
--- /dev/null
+++ b/userprog/syscall_write.c
@@ -0,0 +1,12 @@
+/*
+ * The Write System Call
+ *
+ * Authored by Joshua Saxby
+ */
+#include "system_calls.h"
+#include "threads/interrupt.h"
+
+void syscall_write(struct intr_frame *f) {
+ // TODO: implement me!
+ (void*)0;
+}
diff --git a/userprog/system_calls.h b/userprog/system_calls.h
index 6fadcd1..be83270 100644
--- a/userprog/system_calls.h
+++ b/userprog/system_calls.h
@@ -35,6 +35,13 @@ void syscall_wait(struct intr_frame *f);
*/
void syscall_create(struct intr_frame *f);
+/*
+ * Writes size bytes from buffer to the open file fd.
+ * Returns the number of bytes actually written, which may be less than size if
+ * some bytes could not be written.
+ */
+void syscall_write(struct intr_frame *f);
+
/*
* NOTE: There are more system calls implemented by Pintos but we are not
* implementing them because the assignment brief does not ask of it.
--
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