Date: Thu, 26 May 2005 14:17:05 -0700
Message-Id: <200505262117.j4QLH5BD010823@magilla.sf.frob.com>
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From: Roland McGrath <roland@redhat.com>
To: "Michael Kerrisk" <mtk-lkml@gmx.net>
Cc: linux-kernel@vger.kernel.org, michael.kerrisk@gmx.net
Subject: Re: waitid() fails with EINVAL for SA_RESTART signals
In-Reply-To: Michael Kerrisk's message of  Wednesday, 18 May 2005 10:20:47 +0200 <24601.1116404447@www71.gmx.net>
Sender: linux-kernel-owner@vger.kernel.org
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Your test works fine on FC4 kernels (which are pretty current),
but it does hit the problem on my vanilla build.  strace output suggests
something is clobbering two registers:

waitid(P_PID, 1740, Sending signal to parent
0xbfc8b198, WEXITED|WSTOPPED|WCONTINUED, NULL) = ? ERESTARTSYS (To be restarted)
--- SIGUSR1 (User defined signal 1) @ 0 (0) ---
--- SIGCHLD (Child exited) @ 0 (0) ---
write(1, "Caught signal", 13Caught signal)           = 13
write(1, "\n", 1
)                       = 1
sigreturn()                             = ? (mask now [])
waitid(0x6cc /* P_??? */, 14, 0xbfc8b198, 0, NULL) = -1 EINVAL (Invalid argument)


I will look into it further.


Thanks,
Roland
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