Using fork or pthread makes no difference.
A sleep at the end of main() works wonders.
But not for the other exit() functions. 'scanimage -h' or 'scanimage -A'
still hang with the same issue.
I suggest to replace atexit and all exit() functions by the existing
scanimage_exit() function.
Please check if attached patch is running with your installations.
Cheers,
Rolf
Am 18.08.2015 um 03:31 schrieb m. allan noah:
> Good point. Rolf- any chance you could insert a sleep at the end of
> main()? Also, does the backend in question use fork() on this distro?
>
> allan
>
> On Mon, Aug 17, 2015 at 8:30 PM, Olaf Meeuwissen
> <olaf.meeuwis...@avasys.jp> wrote:
>>
>> m. allan noah writes:
>>
>>> I don't understand. Registered atexit handlers should be called when
>>> main() returns, which is after sane_cancel. What version of
>>> libusb-compat is in use?
>>
>> Please remember that sane_cancel() only *initiates* cancellation. So
>> cancellation may not have finished yet when main() returns. I'm not
>> sure if this is causing the problem but thought I'd mention it anyway.
>>
>> Hope this helps,
>> --
>> Olaf Meeuwissen, LPIC-2 FLOSS Engineer -- EPSON AVASYS CORPORATION
>> FSF Associate Member #1962 Help support software freedom
>> http://www.fsf.org/jf?referrer=1962
>
>
>
--- ./scanimage.c 2015-08-18 13:02:23.132264339 +0200
+++ ../sane-backends/frontend/scanimage.c 2015-08-18 13:02:39.791040702 +0200
@@ -135,7 +135,7 @@
static const char *icc_profile = NULL;
static void fetch_options (SANE_Device * device);
-static void scanimage_exit (void);
+static void scanimage_exit (int);
static SANE_Word tl_x = 0;
static SANE_Word tl_y = 0;
@@ -687,7 +687,7 @@
fprintf (stderr,
"%s: option --%s: bad option value (rest of option: %s)\n",
prog_name, opt->name, str);
- exit (1);
+ scanimage_exit (1);
}
str = end;
@@ -796,7 +796,7 @@
{
fprintf (stderr, "%s: option --%s: closing bracket missing "
"(rest of option: %s)\n", prog_name, opt->name, str);
- exit (1);
+ scanimage_exit (1);
}
str = end + 1;
}
@@ -808,20 +808,20 @@
fprintf (stderr,
"%s: option --%s: index %d out of range [0..%ld]\n",
prog_name, opt->name, index, (long) vector_length - 1);
- exit (1);
+ scanimage_exit (1);
}
/* read value */
str = parse_scalar (opt, str, &value);
if (!str)
- exit (1);
+ scanimage_exit (1);
if (*str && *str != '-' && *str != ',')
{
fprintf (stderr,
"%s: option --%s: illegal separator (rest of option: %s)\n",
prog_name, opt->name, str);
- exit (1);
+ scanimage_exit (1);
}
/* store value: */
@@ -874,7 +874,7 @@
if (opt == NULL)
{
fprintf (stderr, "Could not get option descriptor for option 0\n");
- exit (1);
+ scanimage_exit (1);
}
status = sane_control_option (device, 0, SANE_ACTION_GET_VALUE,
@@ -883,7 +883,7 @@
{
fprintf (stderr, "Could not get value for option 0: %s\n",
sane_strstatus (status));
- exit (1);
+ scanimage_exit (1);
}
/* build the full table of long options */
@@ -894,7 +894,7 @@
if (opt == NULL)
{
fprintf (stderr, "Could not get option descriptor for option %d\n",i);
- exit (1);
+ scanimage_exit (1);
}
/* create command line option only for settable options */
@@ -1013,7 +1013,7 @@
{
fprintf (stderr, "%s: setting of option --%s failed (%s)\n",
prog_name, opt->name, sane_strstatus (status));
- exit (1);
+ scanimage_exit (1);
}
if ((info & SANE_INFO_INEXACT) && opt->size == sizeof (SANE_Word))
@@ -1048,7 +1048,7 @@
{
fprintf (stderr, "%s: attempted to set inactive option %s\n",
prog_name, opt->name);
- exit (1);
+ scanimage_exit (1);
}
if ((opt->cap & SANE_CAP_AUTOMATIC) && optarg &&
@@ -1061,7 +1061,7 @@
fprintf (stderr,
"%s: failed to set option --%s to automatic (%s)\n",
prog_name, opt->name, sane_strstatus (status));
- exit (1);
+ scanimage_exit (1);
}
return;
}
@@ -1081,7 +1081,7 @@
{
fprintf (stderr, "%s: option --%s: bad option value `%s'\n",
prog_name, opt->name, optarg);
- exit (1);
+ scanimage_exit (1);
}
}
break;
@@ -1097,7 +1097,7 @@
if (!vector)
{
fprintf (stderr, "%s: out of memory\n", prog_name);
- exit (1);
+ scanimage_exit (1);
}
}
parse_vector (opt, optarg, vector, vector_length);
@@ -1109,7 +1109,7 @@
if (!valuep)
{
fprintf (stderr, "%s: out of memory\n", prog_name);
- exit (1);
+ scanimage_exit (1);
}
strncpy (valuep, optarg, opt->size);
((char *) valuep)[opt->size - 1] = 0;
@@ -1648,7 +1648,7 @@
}
static void
-scanimage_exit (void)
+scanimage_exit (int status)
{
if (device)
{
@@ -1666,6 +1666,7 @@
free (option_number);
if (verbose > 1)
fprintf (stderr, "scanimage: finished\n");
+ exit (status);
}
/** @brief print device options to stdout
@@ -1721,7 +1722,9 @@
SANE_Int version_code;
FILE *ofp = NULL;
+/* Fixme: atexit() isn't working with all Linux and libusb-compat installations
atexit (scanimage_exit);
+*/
buffer_size = (32 * 1024); /* default size */
@@ -1819,7 +1822,7 @@
{
fprintf (stderr, "%s: sane_get_devices() failed: %s\n",
prog_name, sane_strstatus (status));
- exit (1);
+ scanimage_exit (1);
}
if (ch == 'L')
@@ -1916,7 +1919,7 @@
if (defdevname)
printf ("default device is `%s'\n", defdevname);
- exit (0);
+ scanimage_exit (0);
}
case 'V':
@@ -1924,7 +1927,7 @@
VERSION, SANE_VERSION_MAJOR (version_code),
SANE_VERSION_MINOR (version_code),
SANE_VERSION_BUILD (version_code));
- exit (0);
+ scanimage_exit (0);
default:
break; /* ignore device specific options for now */
@@ -1985,12 +1988,12 @@
{
fprintf (stderr, "%s: sane_get_devices() failed: %s\n",
prog_name, sane_strstatus (status));
- exit (1);
+ scanimage_exit (1);
}
if (!device_list[0])
{
fprintf (stderr, "%s: no SANE devices found\n", prog_name);
- exit (1);
+ scanimage_exit (1);
}
devname = device_list[0]->name;
}
@@ -2012,7 +2015,7 @@
if (help)
device = 0;
else
- exit (1);
+ scanimage_exit (1);
}
if (device)
@@ -2025,7 +2028,7 @@
{
fprintf (stderr, "%s: unable to get option count descriptor\n",
prog_name);
- exit (1);
+ scanimage_exit (1);
}
/* We got a device, find out how many options it has */
@@ -2035,7 +2038,7 @@
{
fprintf (stderr, "%s: unable to determine option count\n",
prog_name);
- exit (1);
+ scanimage_exit (1);
}
/* malloc global option lists */
@@ -2047,7 +2050,7 @@
{
fprintf (stderr, "%s: out of memory in main()\n",
prog_name);
- exit (1);
+ scanimage_exit (1);
}
/* load global option lists */
@@ -2078,7 +2081,7 @@
if (!full_optstring)
{
fprintf (stderr, "%s: out of memory\n", prog_name);
- exit (1);
+ scanimage_exit (1);
}
strcpy (full_optstring, BASE_OPTSTRING);
@@ -2099,7 +2102,7 @@
{
case ':':
case '?':
- exit (1); /* error message is printed by getopt_long() */
+ scanimage_exit (1); /* error message is printed by getopt_long() */
case 'd':
case 'h':
@@ -2139,7 +2142,7 @@
fprintf (stderr, "%s: argument without option: `%s'; ", prog_name,
argv[argc - 1]);
fprintf (stderr, "try %s --help\n", prog_name);
- exit (1);
+ scanimage_exit (1);
}
free (full_optstring);
@@ -2172,7 +2175,7 @@
{
printf ("\nAll options specific to device `%s':\n", devname);
print_options(device, num_dev_options, SANE_TRUE);
- exit (0);
+ scanimage_exit (0);
}
}
@@ -2205,11 +2208,11 @@
}
}
fputc ('\n', stdout);
- exit (0);
+ scanimage_exit (0);
}
if (dont_scan)
- exit (0);
+ scanimage_exit (0);
if (output_format != OUTPUT_PNM)
resolution_value = get_resolution ();
@@ -2245,7 +2248,7 @@
else if(isatty(fileno(ofp))){
fprintf (stderr,"%s: output is not a file, exiting\n", prog_name);
- exit (1);
+ scanimage_exit (1);
}
buffer = malloc (buffer_size);
@@ -2388,5 +2391,7 @@
else
status = test_it ();
+ scanimage_exit (status);
+ /* the line below avoids compiler warnings */
return status;
}
--
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