syscalls: clock_get

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
 

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;
+
+}