[Bug libc/748] New: SA_RESTART flag in sigaction is broken

[Bug libc/748] New: SA_RESTART flag in sigaction is broken

[sebastien dot decugis at ext dot bull dot net]

When the SA_RESTART flag is set when installing a signal-catching function with
sigaction(), the signal should not cause an interruptible function to return
with error EINTR but instead the function should restart silently.

The attached test case shows that this behavior is broken on glibc 2.3.4 -- the
sem_wait function, when interrupted, returns with error EINTR.

-- 
           Summary: SA_RESTART flag in sigaction is broken
           Product: glibc
           Version: 2.3.4
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: gotom at debian dot or dot jp
        ReportedBy: sebastien dot decugis at ext dot bull dot net
                CC: glibc-bugs at sources dot redhat dot com


http://sources.redhat.com/bugzilla/show_bug.cgi?id=748

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[Bug libc/748] SA_RESTART flag in sigaction is broken

[sebastien dot decugis at ext dot bull dot net]

------- Additional Comments From sebastien dot decugis at ext dot bull dot net  2005-02-16 15:00 -------
Created an attachment (id=410)
 --> (http://sources.redhat.com/bugzilla/attachment.cgi?id=410&action=view)
test case for this bug.

compile with:
$ gcc -o bug_sigaction2 bug_sigaction2.c -lpthread

then just run:
$ ./bug_sigaction2


-- 


http://sources.redhat.com/bugzilla/show_bug.cgi?id=748

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[Bug libc/748] SA_RESTART flag in sigaction is broken

[jakub at redhat dot com]

------- Additional Comments From jakub at redhat dot com  2005-02-16 15:19 -------
This sounds like kernel bug to me.
Guess returning -ERESTARTSYS; instead of -EINTR; in the only place in
kernel/futex.c that returns EINTR should fix it, but have not tested that.

-- 


http://sources.redhat.com/bugzilla/show_bug.cgi?id=748

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[Bug libc/748] SA_RESTART flag in sigaction is broken

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2005-09-27 00:57 -------
Yes, this is a kernel issue and using ERESTARTSYS should fix it.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


http://sourceware.org/bugzilla/show_bug.cgi?id=748

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