The mq_open(3) man page seems to have standard boilerplate for O_CLOEXEC:
O_CLOEXEC (since Linux 2.6.26)
Set the close-on-exec flag for the message queue descriptor.
See open(2) for a discussion of why this flag is useful.
This implies that message queues remain open across an exec when this
flag is not specified.
However, this is contradicted by mq_overview(7) which states:
The close-on-exec flag (see open(2)) is automatically set on the file
descriptor returned by mq_open(2).
I suggest that the O_CLOEXEC be removed from mq_open(3) or be replaced
by something like: "O_CLOEXEC: this flag has no effect since the
close-on-exec flag is automatically set on the file descriptor
returned by mq_open(2)".
Thanks
-zerksis
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