signal: add basic signals

CMakeLists.txt

@@ -31,6 +31,8 @@ set(SOURCES
   src/setjmp/interrupt.c
   src/setjmp/massive.c
   src/setjmp/simple.c
+  # signal
+  src/signal/signal.c
   # stdlib
   src/stdlib/arith.c
   src/stdlib/fpconv.c

include/ft/all-tests.h

@@ -20,6 +20,9 @@ extern ft_test ft_setjmp_simple;
 extern ft_test ft_setjmp_massive;
 extern ft_test ft_setjmp_interrupt;
 
+/* signal */
+extern ft_test ft_signal_signal;
+
 /* stdlib */
 extern ft_test ft_stdlib_arith;
 extern ft_test ft_stdlib_sizes;

src/main.c

@@ -34,7 +34,10 @@ ft_list headers_libc[] = {
         &ft_setjmp_interrupt,
         NULL,
     }},
-    { "<signal.h>", NULL },
+    { "<signal.h>", (ft_test*[]){
+        &ft_signal_signal,
+        NULL,
+    }},
     { "<stdio.h>", NULL },
     { "<stdlib.h>", (ft_test*[]){
         &ft_stdlib_arith,

src/signal/signal.c

@@ -0,0 +1,45 @@
+#include <ft/test.h>
+#include <ft/all-tests.h>
+#include <signal.h>
+#include <setjmp.h>
+
+static volatile sig_atomic_t last_signum = 0;
+static jmp_buf jb;
+
+void handler(int signum)
+{
+	last_signum = signum;
+}
+
+void handler2(int signum)
+{
+	longjmp(jb, signum);
+}
+
+void _ft_signal_signal(ft_test *t)
+{
+	__sighandler_t prev;
+
+	ft_assert(t, signal(192548, SIG_IGN) == SIG_ERR);
+	signal(SIGINT, SIG_DFL);
+
+	/* Call an ignored signal */
+	prev = signal(SIGINT, SIG_IGN);
+	ft_assert(t, prev == SIG_DFL && raise(SIGINT) == 0);
+
+	/* Call a normal handler */
+	prev = signal(SIGINT, handler);
+	raise(SIGINT);
+	ft_assert(t, prev == SIG_IGN && last_signum == SIGINT);
+
+	/* longjmp() out of a signal handler (same thread) */
+	signal(SIGINT, handler2);
+	int rc = setjmp(jb);
+	if(!rc) raise(SIGINT);
+	else ft_assert(t, rc == SIGINT);
+}
+
+ft_test ft_signal_signal = {
+	.name = "Signal basics",
+	.function = _ft_signal_signal,
+};