[libvirt] [PATCH v2 1/4] util: new function virFileLength()

[Laine Stump]

This new function just calls stat() and returns st_size (or -1 if
there is an error). We may decide we want this function to be more
complex, and handle things like block devices - this is a placeholder
(that works) for any more complicated funtion.

NB: virFileLength() takes a path rather than an fd because it needs to
be called for files that can't be opened (due to permissions).
---
New in "V2"

 src/libvirt_private.syms |  1 +
 src/util/virfile.c       | 13 +++++++++++++
 src/util/virfile.h       |  2 ++
 3 files changed, 16 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index ac6a1e1..1c0b912 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1578,6 +1578,7 @@ virFileIsLink;
 virFileIsMountPoint;
 virFileIsSharedFS;
 virFileIsSharedFSType;
+virFileLength;
 virFileLinkPointsTo;
 virFileLock;
 virFileLoopDeviceAssociate;
diff --git a/src/util/virfile.c b/src/util/virfile.c
index a45279a..11b6027 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -1735,6 +1735,19 @@ virFileActivateDirOverride(const char *argv0)
     }
 }
 
+
+off_t
+virFileLength(const char *file)
+{
+    struct stat s;
+
+    if (stat(file, &s) < 0)
+        return -1;
+
+    return s.st_size;
+}
+
+
 bool
 virFileIsDir(const char *path)
 {
diff --git a/src/util/virfile.h b/src/util/virfile.h
index b4ae6ea..a0c646d 100644
--- a/src/util/virfile.h
+++ b/src/util/virfile.h
@@ -179,6 +179,8 @@ char *virFileFindResourceFull(const char *filename,
 void virFileActivateDirOverride(const char *argv0)
     ATTRIBUTE_NONNULL(1);
 
+off_t virFileLength(const char *file) ATTRIBUTE_NONNULL(1);
+
 bool virFileIsDir (const char *file) ATTRIBUTE_NONNULL(1);
 bool virFileExists(const char *file) ATTRIBUTE_NONNULL(1);
 bool virFileIsExecutable(const char *file) ATTRIBUTE_NONNULL(1);
-- 
2.9.3