remove support for processes returning strings on exit

This isn't really all that useful, it doesn't enable anything that
wasn't possible before. With it removed I'll be able to implement
process_exit() in a much simpler way.

2 files changed, 12 insertions, 16 deletions

diff --git a/src/init/main.c b/src/init/main.c
index 5c798d2..71a2d4e 100644
--- a/src/init/main.c
+++ b/src/init/main.c
@@ -23,7 +23,7 @@ int main(void) {
 
 	tty_fd = _syscall_open("/tty", sizeof("/tty") - 1);
 	if (tty_fd < 0)
-		_syscall_exit(argify("couldn't open tty"));
+		_syscall_exit(1);
 
 	fs_test();
 	test_await();
@@ -32,7 +32,7 @@ int main(void) {
 	while (_syscall_read(tty_fd, &c, 1, 0))
 		_syscall_write(tty_fd, &c, 1, 0);
 
-	_syscall_exit(argify("my job here is done."));
+	_syscall_exit(0);
 }
 
 void read_file(const char *path, size_t len) {
@@ -83,19 +83,15 @@ void fs_test(void) {
 }
 
 void test_await(void) {
-	char buf[16];
-	int len;
+	int ret;
 
-	// the child immediately dies
-	if (!_syscall_fork())
-		_syscall_exit(argify("i'm dead"));
-	if (!_syscall_fork())
-		_syscall_exit(argify("i'm also dead"));
+	if (!_syscall_fork()) _syscall_exit(69);
+	if (!_syscall_fork()) _syscall_exit(420);
 
-	while ((len = _syscall_await(buf, 16)) >= 0) {
+	while ((ret = _syscall_await()) != ~0) {
 		log("await returned: ");
-		_syscall_write(tty_fd, buf, len, 0);
+		//_syscall_write(tty_fd, buf, len, 0); TODO printf
 		log("\n");
 	}
-	log("await: negative len\n");
+	log("await: no more children\n");
 }
diff --git a/src/init/syscalls.c b/src/init/syscalls.c
index f32594e..57a7344 100644
--- a/src/init/syscalls.c
+++ b/src/init/syscalls.c
@@ -1,8 +1,8 @@
 // this file could probably just get generated by a script
 #include <shared/syscalls.h>
 
-_Noreturn void _syscall_exit(const char __user *msg, size_t len) {
-	_syscall(_SYSCALL_EXIT, (int)msg, len, 0, 0);
+_Noreturn void _syscall_exit(int ret) {
+	_syscall(_SYSCALL_EXIT, ret, 0, 0, 0);
 	__builtin_unreachable();
 }
 
@@ -10,8 +10,8 @@ int _syscall_fork(void) {
 	return _syscall(_SYSCALL_FORK, 0, 0, 0, 0);
 }
 
-int _syscall_await(char __user *buf, int len) {
-	return _syscall(_SYSCALL_AWAIT, (int)buf, (int)len, 0, 0);
+int _syscall_await(void) {
+	return _syscall(_SYSCALL_AWAIT, 0, 0, 0, 0);
 }
 
 handle_t _syscall_open(const char __user *path, int len) {