test memory limit

example/mem-limit/solution.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char **argv) {
+    if (argc < 2) {
+        fprintf(stderr, "usage: %s <megabytes>\n", argv[0]);
+        return 1;
+    }
+    long mb = strtol(argv[1], NULL, 10);
+    if (mb <= 0) return 1;
+
+    size_t bytes = (size_t)mb * 1024 * 1024;
+    char *p = (char *)malloc(bytes);
+    if (!p) {
+        fprintf(stderr, "malloc failed\n");
+        return 2;
+    }
+    for (size_t i = 0; i < bytes; i += 4096) {
+        p[i] = (char)(i & 0xff);
+    }
+    volatile char sink = p[bytes - 1];
+    (void)sink;
+
+    printf("ok %ld\n", mb);
+    return 0;
+}