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poll: Clarify when FALSE is returned from read/write_control()

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And also mention what the expected values of errno are going to be.

write_control() will only ever return FALSE if there was a critical error. It
will never return because of EINTR, EAGAIN or EWOULDBLOCK.

read_control() will return FALSE if there was no byte to read, in which case
errno would be EWOULDBLOCK.
In all other cases there was a critical error.

https://bugzilla.gnome.org/show_bug.cgi?id=750397
This commit is contained in:
Sebastian Dröge 2016-06-29 13:35:35 +02:00
parent 254955df62
commit cda3f1213b
1 changed files with 7 additions and 4 deletions
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11
gst/gstpoll.c
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@ -1638,8 +1638,9 @@ gst_poll_set_flushing (GstPoll * set, gboolean flushing)
* This function only works for timer #GstPoll objects created with
* gst_poll_new_timer().
*
* Returns: %TRUE on success. %FALSE when @set is not controllable or when the
* byte could not be written.
* Returns: %TRUE on success. %FALSE when when the byte could not be written.
* errno contains the detailed error code but will never be EAGAIN, EINTR or
* EWOULDBLOCK. %FALSE always signals a critical error.
*/
gboolean
gst_poll_write_control (GstPoll * set)
@ -1663,8 +1664,10 @@ gst_poll_write_control (GstPoll * set)
* This function only works for timer #GstPoll objects created with
* gst_poll_new_timer().
*
* Returns: %TRUE on success. %FALSE when @set is not controllable or when there
* was no byte to read.
* Returns: %TRUE on success. %FALSE when when there was no byte to read or
* reading the byte failed. If there was no byte to read, and only then, errno
* will contain EWOULDBLOCK. For all other values of errno this always signals a
* critical error.
*/
gboolean
gst_poll_read_control (GstPoll * set)