Hi!
Could someone give me some light on the SA_RESTART flag used by
sigaction() as the man page and the *info file contain contrary
information
[snip from the man page]
SA_RESTART
The opposite to SA_ONESHOT, do not restore
the signal action. This provides behavior
compatible with BSD signal semantics.
This seems to be right. I tested it. The SA_RESTART makes the signal
action not be changed with the default action once raised.
[snip from the libc info file]
- Macro: int SA_RESTART
This flag controls what happens when a signal is delivered during
certain primitives (such as `open', `read' or `write'), and the
signal handler returns normally. There are two alternatives: the
library function can resume, or it can return failure with error
code `EINTR'.
The choice is controlled by the `SA_RESTART' flag for the
particular kind of signal that was delivered. If the flag is set,
returning from a handler resumes the library function. If the
flag is clear, returning from a handler makes the function fail.
Well.. I have no idea how to raise signal during open() and to test
this...
So , why is the info contrary and is the man page correct as I think?
And how to acquire behaviour as explained by the *info file i.e. to make
i/o functions "atomic" in the way of resuming operation and not returning
EINTR?
Thanx for the attention!
Marin
-= Why do we need gates in a world without fences? =-
