libos: Add Process::exit()

libos/include/os/Process.h

@@ -81,5 +81,12 @@ namespace os
          * @return Result<void> Whether the function succeeded.
          */
         static Result<void> kill(pid_t pid, int signo);
+
+        /**
+         * @brief Exit the current process.
+         *
+         * @param status The exit status code to return to the parent.
+         */
+        [[noreturn]] static void exit(int status);
     };
 }

libos/src/Process.cpp

@@ -9,6 +9,7 @@
 
 #include <errno.h>
 #include <os/Process.h>
+#include <stdlib.h>
 #include <sys/syscall.h>
 #include <unistd.h>
 
@@ -74,4 +75,9 @@ namespace os
         long rc = syscall(SYS_kill, pid, signo);
         return Result<void>::from_syscall(rc);
     }
+
+    [[noreturn]] void Process::exit(int status)
+    {
+        ::exit(status);
+    }
 }