[tcpdump-workers] libpcap error codes?
--- Begin Message --- Hi, WHile using pcap_inject() in Linux, it is failing with "pcap_inject(): send: Resource temporarily unavailable". In principle, one would expect that for temporary problems (such as this one), one may one to wait a bit and retry. So it would make sense to somehow be able to process the error code/condition, and act differently depending on the error type. Is there a way to get an error code (say, int value), as opposed to a text describing it? Thanks, -- Fernando Gont SI6 Networks e-mail: fg...@si6networks.com PGP Fingerprint: 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492 --- End Message --- ___ tcpdump-workers mailing list tcpdump-workers@lists.tcpdump.org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
Re: [tcpdump-workers] libpcap error codes?
--- Begin Message --- On Oct 7, 2020, at 1:30 PM, Fernando Gont via tcpdump-workers wrote: > WHile using pcap_inject() in Linux, it is failing with "pcap_inject(): send: > Resource temporarily unavailable". In principle, one would expect that for > temporary problems (such as this one), one may one to wait a bit and retry. > So it would make sense to somehow be able to process the error > code/condition, and act differently depending on the error type. > > Is there a way to get an error code (say, int value), as opposed to a text > describing it? There isn't, other than looking at errno. A new API could be added that returns a PCAP_ERROR_ value rather than -1 on error (so as not to break source or binary compatibility with code using the existing APIs).--- End Message --- ___ tcpdump-workers mailing list tcpdump-workers@lists.tcpdump.org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
Re: [tcpdump-workers] libpcap error codes?
--- Begin Message --- On Wed, 7 Oct 2020 14:37:41 -0700 Guy Harris via tcpdump-workers wrote: [...] > A new API could be added that returns a PCAP_ERROR_ value rather than > -1 on error (so as not to break source or binary compatibility with > code using the existing APIs). Do you mean to introduce a function like pcap_error(), which the developers would be able to interrogate if they need in use cases like this? Then existing functions could be slowly updated as needed to store the fault details somewhere for that function. -- Denis Ovsienko --- End Message --- ___ tcpdump-workers mailing list tcpdump-workers@lists.tcpdump.org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
Re: [tcpdump-workers] libpcap error codes?
--- Begin Message --- On Oct 7, 2020, at 3:16 PM, Denis Ovsienko via tcpdump-workers wrote: > Do you mean to introduce a function like pcap_error(), which the > developers would be able to interrogate if they need in use cases like > this? Then existing functions could be slowly updated as needed to store > the fault details somewhere for that function. I was thinking of a new API for injecting packets, which would directly return a PCAP_ERROR_ value. A pcap_last_error() routine would also handle that case, but if a new routine would return a success vs. failure value, it might as well return an error code, so pcap_last_error() would be useful only for existing routines.--- End Message --- ___ tcpdump-workers mailing list tcpdump-workers@lists.tcpdump.org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
