/* Return a file descriptor for the apm_bios device, or -1 if there is an
* error. Is this method secure? Should we make the device in /dev
* instead of /tmp?
*
* apenwarr 2001/05/11: just throw out the weird temporary device file stuff.
* It was only for ancient kernel versions anyway.
*/
int apm_open(void)
{
int fd;
apm_info i;
if (access(APM_PROC, R_OK) || apm_read(&i) == 1)
return -1;
if (i.driver_version[0] >= '1')
{
if ((fd = open(APM_DEVICE, O_RDWR)) < 0)
{
/* Try to create it. This is reasonable
* for backward compatibility.
*/
if (mknod(APM_DEVICE, S_IFCHR | S_IRUSR | S_IWUSR, apm_dev()))
{
unlink(APM_DEVICE);
return -1;
}
fd = open(APM_DEVICE, O_RDWR);
}
return fd;
}
return -1;
}
/*
* Return a file descriptor for the apm_bios device, or -1 if there is an
* error.
*
* apenwarr 2001/05/11: just throw out the weird temporary device file stuff.
* It was only for ancient kernel versions anyway.
* alexamici 2001/12/14: remove the redundant check for kernel apm support.
* Now apm_open() triggers the auto-load of the apm module.
*/
int apm_open(void)
{
int fd;
if ((fd = open(APM_DEVICE, O_RDWR)) < 0)
{
/*
* Try to create it. This is reasonable
* for backward compatibility.
*/
if (mknod(APM_DEVICE, S_IFCHR | S_IRUSR | S_IWUSR, apm_dev()))
{
unlink(APM_DEVICE);
return -1;
}
fd = open(APM_DEVICE, O_RDWR);
}
return fd;
}
