await() 1: wait for child to die, without message passing

The length is a int, because the syscall will have a signed output. A
negative return value will mean an error (such as when it gets called
by a childless process).

2 files changed, 8 insertions, 0 deletions

diff --git a/src/init/main.c b/src/init/main.c
index c6d19a3..4298516 100644
--- a/src/init/main.c
+++ b/src/init/main.c
@@ -22,6 +22,10 @@ int main() {
 	if (_syscall_fork() > 0) {
 		_syscall_debuglog("parent ",
 		           sizeof("parent ") - 1);
+
+		_syscall_await(NULL, NULL);
+		_syscall_debuglog("death ",
+		           sizeof("death ") - 1);
 	} else {
 		_syscall_debuglog("child ",
 		           sizeof("child ") - 1);
diff --git a/src/init/syscalls.c b/src/init/syscalls.c
index d0da33e..4bbd83a 100644
--- a/src/init/syscalls.c
+++ b/src/init/syscalls.c
@@ -12,6 +12,10 @@ int _syscall_fork() {
 	return _syscall(_SYSCALL_FORK, 0, 0, 0);
 }
 
+int _syscall_await(char *buf, int *len) {
+	return _syscall(_SYSCALL_AWAIT, (int)buf, (int)len, 0);
+}
+
 int _syscall_debuglog(const char *msg, size_t len) {
 	return _syscall(_SYSCALL_DEBUGLOG, (int)msg, len, 0);
 }