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libburn/libburn/init.c

80 lines
2.4 KiB

/* -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 8; -*- */
#include <unistd.h>
#include <assert.h>
#include <stdio.h>
#include <signal.h>
#include "init.h"
#include "sg.h"
#include "error.h"
#include "libburn.h"
#include "drive.h"
/* ts A60825 : The storage location for back_hacks.h variables. */
#define BURN_BACK_HACKS_INIT 1
#include "back_hacks.h"
int burn_running = 0;
/* ts A60813 : wether to use O_EXCL and/or O_NONBLOCK in libburn/sg.c */
int burn_sg_open_o_excl = 1;
/* O_NONBLOCK was hardcoded in enumerate_ata() which i hardly use.
For enumerate_sg() it seems ok.
So it should stay default mode until enumerate_ata() without O_NONBLOCK
has been thoroughly tested. */
int burn_sg_open_o_nonblock = 1;
/* wether to take a busy drive as an error */
/* Caution: this is implemented by a rough hack and eventually leads
to unconditional abort of the process */
int burn_sg_open_abort_busy = 0;
int burn_initialize(void)
{
if (burn_running)
return 1;
burn_running = 1;
return 1;
}
void burn_finish(void)
{
assert(burn_running);
burn_wait_all();
/* ts A60904 : ticket 62, contribution by elmom : name addon "_all" */
burn_drive_free_all();
burn_running = 0;
}
/* ts A60813 */
/** Set parameters for behavior on opening device files. To be called early
after burn_initialize() and before any bus scan. But not mandatory at all.
@param exclusive Try to open only devices which are not marked as busy
and try to mark them busy if opened sucessfully. (O_EXCL)
There are kernels which simply don't care about O_EXCL.
Some have it off, some have it on, some are switchable.
@param blocking Try to wait for drives which do not open immediately but
also do not return an error as well. (O_NONBLOCK)
This might stall indefinitely with /dev/hdX hard disks.
@param abort_on_busy Unconditionally abort process when a non blocking
exclusive opening attempt indicates a busy drive.
Use this only after thorough tests with your app.
Parameter value 1 enables a feature, 0 disables.
Default is (1,0,0). Have a good reason before you change it.
*/
void burn_preset_device_open(int exclusive, int blocking, int abort_on_busy)
{
assert(burn_running);
burn_sg_open_o_excl= !!exclusive;
burn_sg_open_o_nonblock= !blocking;
burn_sg_open_abort_busy= !!abort_on_busy;
}