1 files changed, 49 insertions, 0 deletions
diff --git a/src/bin/src/proc/stack/push.c b/src/bin/src/proc/stack/push.c
new file mode 100644
index 0000000..bc68180
--- /dev/null
+++ b/src/bin/src/proc/stack/push.c
@@ -0,0 +1,49 @@
+/*
+ * wnix, a Unix-like operating system for WebAssembly applications.
+ * Copyright (C) 2025  Xavier Del Campo Romero
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <bin/proc.h>
+#include <bin/types.h>
+#include <page.h>
+#include <kprintf.h>
+#include <stddef.h>
+
+int bin_proc_s_push(const void *const src, const size_t n, void *const user)
+{
+    struct bin_proc *const p = user;
+    struct bin_stack *const s = &p->stack;
+    const size_t max = 8192;
+
+    if (n > max || s->sz > max - n)
+    {
+        kprintf("%s: stack overflow\n", p->path);
+        return -1;
+    }
+
+    const int w = page_write(&s->page, s->sz, src, n);
+
+    if (w < 0)
+        return -1;
+#if 0
+    else if (!w)
+        /* TODO: how to unlock? */
+        return bin_proc_lock(p);
+#endif
+
+    s->sz += w;
+    return w;
+}