syscall/fork: allow sharing handles between threads

2 files changed, 24 insertions, 3 deletions

diff --git a/src/user/app/tests/kernel/threads.c b/src/user/app/tests/kernel/threads.c
index 9f08c39..2964883 100644
--- a/src/user/app/tests/kernel/threads.c
+++ b/src/user/app/tests/kernel/threads.c
@@ -1,16 +1,15 @@
 #include "../tests.h"
 #include <camellia/flags.h>
 #include <camellia/syscalls.h>
+#include <string.h>
 #include <user/lib/esemaphore.h>
 #include <user/lib/thread.h>
 
 int global_n;
-
 static void basic_thread(void *sem) {
 	global_n = 10;
 	esem_signal(sem);
 }
-
 static void test_basic_thread(void) {
 	struct evil_sem *sem = esem_new(0);
 	global_n = 0;
@@ -19,6 +18,28 @@ static void test_basic_thread(void) {
 	test(global_n == 10);
 }
 
+
+handle_t global_h;
+static void shared_handle(void *sem) {
+	handle_t ends[2];
+	test(_syscall_pipe(ends, 0) >= 0);
+	global_h = ends[0];
+	esem_signal(sem);
+	_syscall_write(ends[1], "Hello!", 7, -1, 0);
+}
+static void test_shared_handle(void) {
+	struct evil_sem *sem = esem_new(0);
+	char buf[16];
+	global_h = -1;
+	thread_create(FORK_NOREAP, shared_handle, sem);
+	esem_wait(sem);
+
+	test(global_h >= 0);
+	test(_syscall_read(global_h, buf, sizeof buf, 0) == 7);
+	test(!strcmp("Hello!", buf));
+}
+
 void r_k_threads(void) {
 	run_test(test_basic_thread);
+	run_test(test_shared_handle);
 }
diff --git a/src/user/lib/thread.c b/src/user/lib/thread.c
index 25d98a9..f7353ad 100644
--- a/src/user/lib/thread.c
+++ b/src/user/lib/thread.c
@@ -4,7 +4,7 @@
 #include <user/lib/thread.h>
 
 void thread_create(int flags, void (*fn)(void*), void *arg) {
-	if (!_syscall_fork(flags | FORK_SHAREMEM, NULL)) {
+	if (!_syscall_fork(flags | FORK_SHAREMEM | FORK_SHAREHANDLE, NULL)) {
 		void *stack = malloc(4096);
 		chstack(arg, fn, stack + 4096);
 	}