Date: Wed, 24 Aug 2011 22:19:07 +0400 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: freebsd-stable@freebsd.org Subject: sigwait return 4 Message-ID: <20110824181907.GA48394@zxy.spb.ru>
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System is 8.2-RELEASE (GENERIC), amd64.
Application -- i386 for freebsd7.
In ktrace dump I find some strange result:
22951 100556 kas-milter CALL sigwait(0xffdfdf80,0xffdfdf7c)
22951 100556 kas-milter RET sigwait 4
22951 100556 kas-milter PSIG SIGUSR2 caught handler=0x804c0f0 mask=0x4003 code=0x0
RET sigwait 4 confused me, and, I think, confused application too.
man sigwait:
ERRORS
The sigwait() system call will fail if:
[EINVAL] The set argument specifies one or more invalid signal
numbers.
[EFAULT] Any arguments point outside the allocated address
space or there is a memory protection fault.
How sigwait can return '4'?
May be EINTR, converted from ERESTART? But kern_sigtimedwait from sigwait must
be called with timeout == NULL...
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