[libvirt] [PATCH 1/2] util: Introduce virFileCdromStatus

[Han Han]

This private API helps check cdrom drive status via ioctl().

Signed-off-by: Han Han <hhan at redhat.com>
---
 src/libvirt_private.syms |  1 +
 src/util/virfile.c       | 52 ++++++++++++++++++++++++++++++++++++++++
 src/util/virfile.h       | 10 ++++++++
 3 files changed, 63 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 5499a368c0..e9f79ad433 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1797,6 +1797,7 @@ virFileActivateDirOverride;
 virFileBindMountDevice;
 virFileBuildPath;
 virFileCanonicalizePath;
+virFileCdromStatus;
 virFileChownFiles;
 virFileClose;
 virFileComparePaths;
diff --git a/src/util/virfile.c b/src/util/virfile.c
index 378d03ecf0..790d9448d2 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -2026,6 +2026,58 @@ virFileIsCDROM(const char *path)
     return ret;
 }
 
+/**
+ * virFileCdromStatus:
+ * @path: Cdrom path
+ *
+ * Returns:
+ *      -1                              error happends.
+ *      VIR_FILE_CDROM_DISC_OK          Cdrom is OK.
+ *      VIR_FILE_CDROM_NO_INFO          Information not available.
+ *      VIR_FILE_CDROM_NO_DISC          No disc in cdrom.
+ *      VIR_FILE_CDROM_TREY_OPEN        Cdrom is trey-open.
+ *      VIR_FILE_CDROM_DRIVE_NOT_READY  Cdrom is not ready.
+ * reported.
+ */
+int
+virFileCdromStatus(const char *path)
+{
+    int ret = -1;
+    int fd;
+
+    if ((fd = open(path, O_RDONLY | O_NONBLOCK)) < 0)
+        goto cleanup;
+
+    /* Attempt to detect CDROM status via ioctl */
+    if ((ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT)) >= 0) {
+        switch (ret) {
+            case CDS_NO_INFO:
+                ret = VIR_FILE_CDROM_NO_INFO;
+                goto cleanup;
+                break;
+            case CDS_NO_DISC:
+                ret = VIR_FILE_CDROM_NO_DISC;
+                goto cleanup;
+                break;
+            case CDS_TRAY_OPEN:
+                ret = VIR_FILE_CDROM_TREY_OPEN;
+                goto cleanup;
+                break;
+            case CDS_DRIVE_NOT_READY:
+                ret = VIR_FILE_CDROM_DRIVE_NOT_READY;
+                goto cleanup;
+                break;
+            case CDS_DISC_OK:
+                ret = VIR_FILE_CDROM_DISC_OK;
+                goto cleanup;
+                break;
+        }
+    }
+
+ cleanup:
+    VIR_FORCE_CLOSE(fd);
+    return ret;
+}
 #else
 
 int
diff --git a/src/util/virfile.h b/src/util/virfile.h
index 6f1e802fde..9d4701c8d2 100644
--- a/src/util/virfile.h
+++ b/src/util/virfile.h
@@ -212,6 +212,16 @@ int virFileIsSharedFS(const char *path) ATTRIBUTE_NONNULL(1);
 int virFileIsMountPoint(const char *file) ATTRIBUTE_NONNULL(1);
 int virFileIsCDROM(const char *path)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
+int virFileCdromStatus(const char *path)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
+
+enum {
+    VIR_FILE_CDROM_DISC_OK = 1,
+    VIR_FILE_CDROM_NO_INFO,
+    VIR_FILE_CDROM_NO_DISC,
+    VIR_FILE_CDROM_TREY_OPEN,
+    VIR_FILE_CDROM_DRIVE_NOT_READY,
+};
 
 int virFileGetMountSubtree(const char *mtabpath,
                            const char *prefix,
-- 
2.17.1