From a35c9039b43f41e63cea5beba39fe752af9698c9 Mon Sep 17 00:00:00 2001
From: Dominic Grimm <dominic@dergrimm.net>
Date: Mon, 10 Feb 2025 21:27:44 +0100
Subject: [PATCH] Init

---
 getauxval.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 getauxval.c

diff --git a/getauxval.c b/getauxval.c
new file mode 100644
index 0000000..4428571
--- /dev/null
+++ b/getauxval.c
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <sys/auxv.h>
+
+#ifdef GETAUXVAL_BACKPORT_ELF64
+typedef Elf64_auxv_t __auxv_t;
+#else
+typedef Elf32_auxv_t __auxv_t;
+#endif
+
+unsigned long getauxval(unsigned long type) {
+#ifdef GETAUXVAL_BACKPORT_DEBUG
+  printf("getauxval: search started for type: %lu\n", type);
+#endif
+
+  FILE *f = fopen("/proc/self/auxv", "rb");
+  if (f == NULL)
+    return 1;
+
+  unsigned long val = AT_NULL;
+  __auxv_t aux;
+
+#ifdef GETAUXVAL_BACKPORT_DEBUG
+  unsigned int i = 0;
+#endif
+
+  while (fread(&aux, sizeof(aux), 1, f) == 1 && aux.a_type != AT_NULL) {
+#ifdef GETAUXVAL_BACKPORT_DEBUG
+    printf("getauxval: current type: %u [%u]\n", aux.a_type, i);
+#endif
+
+    if (aux.a_type == type) {
+#ifdef GETAUXVAL_BACKPORT_DEBUG
+      printf("getauxval: found %u with value: 0x%x\n", aux.a_type,
+             aux.a_un.a_val);
+#endif
+
+      val = aux.a_un.a_val;
+      break;
+    }
+
+#ifdef GETAUXVAL_BACKPORT_DEBUG
+    i++;
+#endif
+  }
+
+  fclose(f);
+
+  return val;
+}