RTEMS | libcsupport/libio: Add rtems_libio_iop_descriptors_open to return open descriptors (!117)

[Chris Johns (@chris)]

Chris Johns commented on a discussion on testsuites/libtests/libiofdopen/init.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/117#note_109495

 > +#define NUMOF(_a) (sizeof(_a) / sizeof(_a[0]))
 > +
 > +static void Init(rtems_task_argument arg)
 > +{
 > +  int fd[10];
 > +  size_t i;
 > +  size_t base_count;
 > +
 > +  TEST_BEGIN();
 > +
 > +  for (i = 0; i < NUMOF(fd); i++) {
 > +    fd[i] = -1;
 > +  }
 > +
 > +  base_count = rtems_libio_iop_descriptors_open();
 > +  printf("default open count = %zu\n", base_count);

I was not aware of this. It can be removed.

BSPs can have different numbers of `fd` open.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/117#note_109495
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