kernel: implement _sys_time()

After some consideration this seems like the most fitting way to handle
timekeeping. Directly, the syscall is only useful for keeping time within a
single process, but it is meant to be used for e.g. NTP clients, which will
provide the real time through the VFS.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/libk/include/camellia/syscalls.h b/src/libk/include/camellia/syscalls.h
index 58898d4..d27ae0c 100644
--- a/src/libk/include/camellia/syscalls.h
+++ b/src/libk/include/camellia/syscalls.h
@@ -22,6 +22,7 @@
 #define _SYS_GETPPID 20
 #define _SYS_WAIT2 21
 #define _SYS_GETPROCFS 22
+#define _SYS_TIME 23
 
 #define _SYS_EXECBUF 100
 #define _SYS_DEBUG_KLOG 101
@@ -84,6 +85,9 @@ int _sys_wait2(int pid, int flags, struct sys_wait2 __user *out);
 
 hid_t _sys_getprocfs(int flags);
 
+/** Returns the time in nanoseconds since the first _sys_time call in the process */
+uint64_t _sys_time(int flags);
+
 /* see shared/execbuf.h */
 long _sys_execbuf(void __user *buf, size_t len);