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return errors properly in comedi_mark_buffer_read() and

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comedi_mark_buffer_written()
This commit is contained in:
Frank Mori Hess 2005-04-25 21:43:37 +00:00
parent 4f670c0248
commit 58a2e315df
1 changed files with 12 additions and 4 deletions
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16
lib/buffer.c
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@ -84,8 +84,12 @@ int _comedi_mark_buffer_read(comedi_t *it, unsigned int subdev, unsigned int byt
bi.subdevice = subdev;
bi.bytes_read = bytes;
ret = comedi_ioctl(it->fd, COMEDI_BUFINFO, (unsigned long)&bi);
__comedi_errno = errno;
if(__comedi_errno == EPIPE)__comedi_errno = EBUF_OVR;
if(ret < 0)
{
__comedi_errno = errno;
if(__comedi_errno == EPIPE)__comedi_errno = EBUF_OVR;
return ret;
}
return bi.buf_write_count - bi.buf_read_count;
}
@ -99,8 +103,12 @@ int _comedi_mark_buffer_written(comedi_t *it, unsigned int subdev, unsigned int
bi.subdevice = subdev;
bi.bytes_written = bytes;
ret = comedi_ioctl(it->fd, COMEDI_BUFINFO, (unsigned long)&bi);
__comedi_errno = errno;
if(__comedi_errno == EPIPE)__comedi_errno = EBUF_UNDR;
if(ret < 0)
{
__comedi_errno = errno;
if(__comedi_errno == EPIPE)__comedi_errno = EBUF_UNDR;
return ret;
}
return bi.buf_write_count - bi.buf_read_count;
}