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authorFlorian Weimer <fweimer@redhat.com>2020-10-27 10:42:10 +0100
committerFlorian Weimer <fweimer@redhat.com>2020-10-27 16:34:37 +0100
commit562ef5e69eb38230810bd25a4335224a31bfe31b (patch)
treef89ee605da223922e9d2920704af109bbf495772 /misc
parent0ce51bef34e1edde9f60ccd6d9d70c56020d9d21 (diff)
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misc: Add internal __getauxval2 function
The explicit error return value (without in-band signaling) avoids
complicated steps to detect errors based on whether errno has been
updated.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Diffstat (limited to 'misc')
-rw-r--r--misc/getauxval.c33
1 files changed, 27 insertions, 6 deletions
diff --git a/misc/getauxval.c b/misc/getauxval.c
index d7f9f957d0..e96d4dfa20 100644
--- a/misc/getauxval.c
+++ b/misc/getauxval.c
@@ -18,26 +18,47 @@
 #include <sys/auxv.h>
 #include <errno.h>
 #include <ldsodefs.h>
+#include <stdbool.h>
 
-
-unsigned long int
-__getauxval (unsigned long int type)
+bool
+__getauxval2 (unsigned long int type, unsigned long int *result)
 {
 #ifdef HAVE_AUX_VECTOR
   ElfW(auxv_t) *p;
 #endif
 
   if (type == AT_HWCAP)
-    return GLRO(dl_hwcap);
+    {
+      *result = GLRO(dl_hwcap);
+      return true;
+    }
   else if (type == AT_HWCAP2)
-    return GLRO(dl_hwcap2);
+    {
+      *result = GLRO(dl_hwcap2);
+      return true;
+    }
 
 #ifdef HAVE_AUX_VECTOR
   for (p = GLRO(dl_auxv); p->a_type != AT_NULL; p++)
     if (p->a_type == type)
-      return p->a_un.a_val;
+      {
+        *result = p->a_un.a_val;
+        return true;
+      }
 #endif
 
+  return false;
+}
+libc_hidden_def (__getauxval2)
+
+unsigned long int
+__getauxval (unsigned long int type)
+{
+  unsigned long int result;
+
+  if (__getauxval2 (type, &result))
+    return result;
+
   __set_errno (ENOENT);
   return 0;
 }