kernel: close syscall

kernel-src/arch/x86-64/syscall.asm

@@ -4,13 +4,15 @@ extern syscall_mmap
 extern syscall_openat
 extern syscall_read
 extern syscall_seek
+extern syscall_close
 syscalltab:
 dq syscall_print
 dq syscall_mmap
 dq syscall_openat
 dq syscall_read
 dq syscall_seek
-syscallcount equ 5
+dq syscall_close
+syscallcount equ 6
 section .text
 global arch_syscall_entry
 ; on entry:

kernel-src/sys/syscalls/close.c

@@ -0,0 +1,13 @@
+#include <kernel/syscalls.h>
+#include <kernel/file.h>
+
+syscallret_t syscall_close(context_t *context, int fd) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	ret.errno = fd_close(fd);
+	ret.ret = 0;
+
+	return ret;
+}