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cdrom_id: open non-mounted optical media with O_EXCL

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This should prevent confusing drives during CD burning sessions. Based
on a patch from Harald Hoyer.
This commit is contained in:
Kay Sievers 2010-03-18 11:14:32 +01:00
parent 23325a66cc
commit 38a3cde11b
1 changed files with 25 additions and 1 deletions
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26
extras/cdrom_id/cdrom_id.c
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@ -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);