From 42ad59bdb6df99ccd146d6d67cb8c838be709ec5 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Tue, 26 Mar 2024 18:25:07 -0400
Subject: kernel: Add sys_close()

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/include/sys/filedesc.h |  1 +
 sys/include/sys/syscall.h  |  1 +
 sys/kern/kern_filedesc.c   | 10 ++++++++++
 sys/kern/kern_syscall.c    |  1 +
 4 files changed, 13 insertions(+)

diff --git a/sys/include/sys/filedesc.h b/sys/include/sys/filedesc.h
index 6eb500e..e0835a5 100644
--- a/sys/include/sys/filedesc.h
+++ b/sys/include/sys/filedesc.h
@@ -58,6 +58,7 @@ int open(const char *pathname, int oflag);
 
 uint64_t sys_write(struct syscall_args *args);
 uint64_t sys_open(struct syscall_args *args);
+uint64_t sys_close(struct syscall_args *args);
 #endif
 
 #endif
diff --git a/sys/include/sys/syscall.h b/sys/include/sys/syscall.h
index 0f066e5..5020d3a 100644
--- a/sys/include/sys/syscall.h
+++ b/sys/include/sys/syscall.h
@@ -40,6 +40,7 @@ enum {
     SYS_exit = 1,
     SYS_write,
     SYS_open,
+    SYS_close,
     __MAX_SYSCALLS
 };
 
diff --git a/sys/kern/kern_filedesc.c b/sys/kern/kern_filedesc.c
index c429125..6f59508 100644
--- a/sys/kern/kern_filedesc.c
+++ b/sys/kern/kern_filedesc.c
@@ -330,3 +330,13 @@ sys_open(struct syscall_args *args)
     dynfree(pathbuf);
     return ret;
 }
+
+/*
+ * arg0: fd
+ */
+uint64_t
+sys_close(struct syscall_args *args)
+{
+    fd_close_fdnum(this_td(), args->arg0);
+    return 0;
+}
diff --git a/sys/kern/kern_syscall.c b/sys/kern/kern_syscall.c
index dc37274..4acfdc5 100644
--- a/sys/kern/kern_syscall.c
+++ b/sys/kern/kern_syscall.c
@@ -44,4 +44,5 @@ uint64_t(*g_syscall_table[__MAX_SYSCALLS])(struct syscall_args *args) = {
     sys_exit,
     sys_write,
     sys_open,
+    sys_close,
 };
-- 
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