From 280494cce023f3938023b9b2b1173405601e4ddf Mon Sep 17 00:00:00 2001
From: Phil Knirsch <pknirsch@redhat.com>
Date: Mon, 16 Apr 2012 19:02:34 +0200
Subject: [PATCH] - Add general /proc/self/auxv parsing to rpmrc for better
 machine detection

Signed-off-by: Panu Matilainen <pmatilai@redhat.com>
---
 lib/rpmrc.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/lib/rpmrc.c b/lib/rpmrc.c
index 4b6b29a..edb9cd6 100644
--- a/lib/rpmrc.c
+++ b/lib/rpmrc.c
@@ -2,6 +2,12 @@
 
 #include <stdarg.h>
 
+#if defined(__linux__)
+#include <elf.h>
+#include <link.h>
+#endif
+
+
 #if HAVE_SYS_UTSNAME_H
 #include <sys/utsname.h>
 #endif
@@ -73,6 +79,11 @@ struct rpmOption {
     int localize;
 };
 
+static struct rpmat_s {
+    const char *platform;
+    uint64_t hwcap;
+} rpmat;
+
 typedef struct defaultEntry_s {
     char * name;
     char * defName;
@@ -897,6 +908,46 @@ static int is_geode(void)
 }
 #endif
 
+
+#if defined(__linux__)
+/**
+ * Populate rpmat structure with parsed info from /proc/self/auxv
+ */
+static void parse_auxv(void)
+{
+    static int oneshot = 1;
+
+    if (oneshot) {
+	rpmat.platform = "";
+	int fd = open("/proc/self/auxv", O_RDONLY);
+
+	if (fd == -1) {
+	    rpmlog(RPMLOG_WARNING,
+		   _("Failed to read auxiliary vector, /proc not mounted?\n"));
+            return;
+	} else {
+	    ElfW(auxv_t) auxv;
+	    while (read(fd, &auxv, sizeof(auxv)) == sizeof(auxv)) {
+                switch (auxv.a_type)
+                {
+                    case AT_NULL:
+                        break;
+                    case AT_PLATFORM:
+                        rpmat.platform = strdup((char *) auxv.a_un.a_val);
+                        break;
+                    case AT_HWCAP:
+                        rpmat.hwcap = auxv.a_un.a_val;
+                        break;
+                }
+	    }
+	    close(fd);
+	}
+	oneshot = 0; /* only try once even if it fails */
+    }
+    return;
+}
+#endif
+
 /**
  */
 static void defaultMachine(const char ** arch,
@@ -908,6 +959,11 @@ static void defaultMachine(const char ** arch,
     canonEntry canon;
     int rc;
 
+#if defined(__linux__)
+    /* Populate rpmat struct with hw info */
+    parse_auxv();
+#endif
+
     while (!gotDefaults) {
 	if (!rpmPlatform(platform)) {
 	    char * s = rpmExpand("%{_host_cpu}", NULL);
-- 
2.7.4