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From: Muttley@DastardlyHQ.org
Newsgroups: comp.unix.programmer
Subject: Re: signalfd()
Date: Mon, 24 Feb 2025 15:51:29 -0000 (UTC)
Organization: A noiseless patient Spider
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Message-ID: <vpi4i1$16dip$1@dont-email.me>
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On Mon, 24 Feb 2025 14:18:44 GMT
scott@slp53.sl.home (Scott Lurndal) wibbled:
>Muttley@DastardlyHQ.org writes:
>>Hi
>>
>>I've been playing around with signalfd() on linux and it seems to work but
>>there also seems to be zero information other than the signal number in the
>>signalfd_siginfo structure returned from a read(). 
>>
>>Where I'd expect PID and UID to be set as in reception of a signal handler
>>set using sigaction with the siginfo_t passed to the handler, the below code
>>returns 0 for everything in the signalfd_siginfo structure.
>
>I wonder if you still need to call sigaction with SA_SIGINFO before
>using signalfd?

Actually my mistake - the pid and uid are only zerop when it receives a signal
from the terminal but when another process sends it it works ok. Thanks for
the idea though.