[libvirt] [PATCHv2 2/7] nodeinfo: use virDirRead API

[Eric Blake]

From: Natanael Copa <ncopa at alpinelinux.org>

This makes sure that errno is reset before readdir is called, even if
the loop does a 'continue'.

This fixes issue with musl libc which sets errno on sscanf. The
following 'continue' makes the errno be set before calling readdir.

Signed-off-by: Natanael Copa <ncopa at alpinelinux.org>
Signed-off-by: Eric Blake <eblake at redhat.com>
---
 src/nodeinfo.c | 31 +++++++++----------------------
 1 file changed, 9 insertions(+), 22 deletions(-)

diff --git a/src/nodeinfo.c b/src/nodeinfo.c
index 53ba716..56f2b02 100644
--- a/src/nodeinfo.c
+++ b/src/nodeinfo.c
@@ -1,7 +1,7 @@
 /*
  * nodeinfo.c: Helper routines for OS specific node information
  *
- * Copyright (C) 2006-2008, 2010-2013 Red Hat, Inc.
+ * Copyright (C) 2006-2008, 2010-2014 Red Hat, Inc.
  * Copyright (C) 2006 Daniel P. Berrange
  *
  * This library is free software; you can redistribute it and/or
@@ -440,6 +440,7 @@ virNodeParseNode(const char *node,
     int siblings;
     unsigned int cpu;
     int online;
+    int direrr;

     *threads = 0;
     *cores = 0;
@@ -452,8 +453,7 @@ virNodeParseNode(const char *node,

     /* enumerate sockets in the node */
     CPU_ZERO(&sock_map);
-    errno = 0;
-    while ((cpudirent = readdir(cpudir))) {
+    while ((direrr = virDirRead(cpudir, &cpudirent, node)) > 0) {
         if (sscanf(cpudirent->d_name, "cpu%u", &cpu) != 1)
             continue;

@@ -470,14 +470,10 @@ virNodeParseNode(const char *node,

         if (sock > sock_max)
             sock_max = sock;
-
-        errno = 0;
     }

-    if (errno) {
-        virReportSystemError(errno, _("problem reading %s"), node);
+    if (direrr < 0)
         goto cleanup;
-    }

     sock_max++;

@@ -490,8 +486,7 @@ virNodeParseNode(const char *node,

     /* iterate over all CPU's in the node */
     rewinddir(cpudir);
-    errno = 0;
-    while ((cpudirent = readdir(cpudir))) {
+    while ((direrr = virDirRead(cpudir, &cpudirent, node)) > 0) {
         if (sscanf(cpudirent->d_name, "cpu%u", &cpu) != 1)
             continue;

@@ -530,14 +525,10 @@ virNodeParseNode(const char *node,

         if (siblings > *threads)
             *threads = siblings;
-
-        errno = 0;
     }

-    if (errno) {
-        virReportSystemError(errno, _("problem reading %s"), node);
+    if (direrr < 0)
         goto cleanup;
-    }

     /* finalize the returned data */
     *sockets = CPU_COUNT(&sock_map);
@@ -576,6 +567,7 @@ int linuxNodeInfoCPUPopulate(FILE *cpuinfo,
     int ret = -1;
     char *sysfs_nodedir = NULL;
     char *sysfs_cpudir = NULL;
+    int direrr;

     /* Start with parsing CPU clock speed from /proc/cpuinfo */
     while (fgets(line, sizeof(line), cpuinfo) != NULL) {
@@ -672,8 +664,7 @@ int linuxNodeInfoCPUPopulate(FILE *cpuinfo,
         goto fallback;
     }

-    errno = 0;
-    while ((nodedirent = readdir(nodedir))) {
+    while ((direrr = virDirRead(nodedir, &nodedirent, sysfs_nodedir)) > 0) {
         if (sscanf(nodedirent->d_name, "node%u", &node) != 1)
             continue;

@@ -699,14 +690,10 @@ int linuxNodeInfoCPUPopulate(FILE *cpuinfo,

         if (threads > nodeinfo->threads)
             nodeinfo->threads = threads;
-
-        errno = 0;
     }

-    if (errno) {
-        virReportSystemError(errno, _("problem reading %s"), sysfs_nodedir);
+    if (direrr < 0)
         goto cleanup;
-    }

     if (nodeinfo->cpus && nodeinfo->nodes)
         goto done;
-- 
1.9.0