From ef782edab20b82b08762ffc9eee0c5995c89b175 Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Mon, 17 Oct 2022 14:29:29 -0300
Subject: [PATCH] syscalls: clock_get

---
 src/arch/x86_64/syscall.asm  |  4 +++-
 src/sys/syscalls/clock_get.c | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100644 src/sys/syscalls/clock_get.c

diff --git a/src/arch/x86_64/syscall.asm b/src/arch/x86_64/syscall.asm
index c5710b74..11fa0941 100644
--- a/src/arch/x86_64/syscall.asm
+++ b/src/arch/x86_64/syscall.asm
@@ -34,7 +34,8 @@ extern syscall_fchmodat
 extern syscall_openat
 extern syscall_chroot
 extern syscall_mkdirat
-func_count equ 33
+extern syscall_clock_gettime
+func_count equ 34
 
 
 func_table:
@@ -71,6 +72,7 @@ func_table:
 	dq syscall_openat
 	dq syscall_chroot
 	dq syscall_mkdirat
+	dq syscall_clock_gettime
 section .text
 global asm_syscall_entry
 
diff --git a/src/sys/syscalls/clock_get.c b/src/sys/syscalls/clock_get.c
new file mode 100644
index 00000000..0c1a898e
--- /dev/null
+++ b/src/sys/syscalls/clock_get.c
@@ -0,0 +1,33 @@
+#include <kernel/syscalls.h>
+#include <arch/timekeeper.h>
+#include <kernel/vmm.h>
+#include <time.h>
+#include <errno.h>
+
+#define CLOCK_REALTIME 0
+
+syscallret syscall_clock_gettime(int clockid, struct timespec *tp){
+	
+	syscallret retv;
+	retv.errno = 0;
+
+	if(tp > USER_SPACE_END){
+		retv.errno = EFAULT;
+		retv.ret = -1;
+		return retv;
+	}
+	
+	switch(clockid){
+		case CLOCK_REALTIME:
+			*tp = arch_timekeeper_gettime();
+			break;
+		default:
+			retv.errno = EINVAL;
+
+	}
+	
+	retv.ret = retv.errno ? -1 : 0;
+
+	return retv;
+
+}