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[Qemu-devel] [PATCH v4] raw-posix: Detect CDROM via ioctl on linux
From: |
Cole Robinson |
Subject: |
[Qemu-devel] [PATCH v4] raw-posix: Detect CDROM via ioctl on linux |
Date: |
Thu, 14 Jan 2010 11:19:40 -0500 |
Current CDROM detection is hardcoded based on source file name.
Make this smarter on linux by attempting a CDROM specific ioctl.
This makes '-cdrom /dev/sr0' succeed with no media present.
v2:
Give ioctl check higher priority than filename check.
v3:
Actually initialize 'prio' variable.
Check for ioctl success rather than absence of specific failure.
v4:
Explicitly mention that change is linux specific.
Signed-off-by: Cole Robinson <address@hidden>
---
block/raw-posix.c | 20 ++++++++++++++++++--
1 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 5a6a22b..a2c7508 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1140,9 +1140,25 @@ static int cdrom_open(BlockDriverState *bs, const char
*filename, int flags)
static int cdrom_probe_device(const char *filename)
{
+ int fd, ret;
+ int prio = 0;
+
if (strstart(filename, "/dev/cd", NULL))
- return 100;
- return 0;
+ prio = 50;
+
+ fd = open(filename, O_RDONLY | O_NONBLOCK);
+ if (fd < 0) {
+ goto out;
+ }
+
+ /* Attempt to detect via a CDROM specific ioctl */
+ ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
+ if (ret >= 0)
+ prio = 100;
+
+ close(fd);
+out:
+ return prio;
}
static int cdrom_is_inserted(BlockDriverState *bs)
--
1.6.5.2
- [Qemu-devel] [PATCH v4] raw-posix: Detect CDROM via ioctl on linux,
Cole Robinson <=