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authorKay Sievers <kay.sievers@vrfy.org>2010-03-18 11:14:32 +0100
committerKay Sievers <kay.sievers@vrfy.org>2010-03-18 11:14:32 +0100
commit38a3cde11bc77af49a96245b8a8a0f2b583a344c (patch)
treea627fdcc1c109c233a22d43c7066a2822e1171de /extras/cdrom_id
parent23325a66ccf3a2f90a4f5d1702f60408187de28a (diff)
cdrom_id: open non-mounted optical media with O_EXCL
This should prevent confusing drives during CD burning sessions. Based on a patch from Harald Hoyer.
Diffstat (limited to 'extras/cdrom_id')
-rw-r--r--extras/cdrom_id/cdrom_id.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/extras/cdrom_id/cdrom_id.c b/extras/cdrom_id/cdrom_id.c
index 2380b158a0..e485768de4 100644
--- a/extras/cdrom_id/cdrom_id.c
+++ b/extras/cdrom_id/cdrom_id.c
@@ -112,6 +112,30 @@ static unsigned long long int cd_media_session_last_offset;
#define ASC(errcode) (((errcode) >> 8) & 0xFF)
#define ASCQ(errcode) ((errcode) & 0xFF)
+static int is_mounted(const char *device)
+{
+ struct stat statbuf;
+ FILE *fp;
+ int maj, min;
+ int mounted = 0;
+
+ if (stat(device, &statbuf) < 0)
+ return -ENODEV;
+
+ fp = fopen("/proc/self/mountinfo", "r");
+ if (fp == NULL)
+ return -ENOSYS;
+ while (fscanf(fp, "%*s %*s %i:%i %*[^\n]", &maj, &min) == 2) {
+ printf("got %u %u\n", maj, min);
+ if (makedev(maj, min) == statbuf.st_rdev) {
+ mounted = 1;
+ break;
+ }
+ }
+ fclose(fp);
+ return mounted;
+}
+
static void info_scsi_cmd_err(struct udev *udev, char *cmd, int err)
{
if (err == -1) {
@@ -568,7 +592,7 @@ int main(int argc, char *argv[])
goto exit;
}
- fd = open(node, O_RDONLY | O_NONBLOCK);
+ fd = open(node, O_RDONLY|O_NONBLOCK|(is_mounted(node) ? 0 : O_EXCL));
if (fd < 0) {
info(udev, "unable to open '%s'\n", node);
fprintf(stderr, "unable to open '%s'\n", node);