tcpdump mailing list archives
Re: capturing on both interfaces simultaneously
From: Guy Harris <guy () alum mit edu>
Date: Sun, 11 Dec 2011 11:07:20 -0800
On Dec 11, 2011, at 8:36 AM, abhinav narain wrote:
the return value of error is -1, EINTR is 4.
For many UN*X APIs, "the return value" and "the error" are not the same; "the return value" on an error is -1, and "the error" is in the variable "errno". The select() man page on my system (not a Linux distribution, but that doesn't matter, UN*Xes are all the same here) says: RETURN VALUES Select() returns the number of ready descriptors that are contained in the descriptor sets, or -1 if an error occurred. If the time limit expires, select() returns 0. If select() returns with an error, includ- ing one due to an interrupted call, the descriptor sets will be unmodi- fied and the global variable errno will be set to indicate the error. so it's one of those APIs. What you should do is to, if select() returns -1 *and* errno is EINTR, just ignore the error and continue looping.
Also, it keeps printing ": Resource temporarily unavailable" though I don't have any error statement to be printed.
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Current thread:
- Re: capturing on both interfaces simultaneously, (continued)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 10)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 10)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 10)
- Re: capturing on both interfaces simultaneously Cedric Cellier (Dec 10)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 11)
- Re: capturing on both interfaces simultaneously rixed (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 11)
- Re: capturing on both interfaces simultaneously rixed (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 11)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 11)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 11)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 11)
- Re: capturing on both interfaces simultaneously Gianluca Varenni (Dec 11)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 12)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 12)
- Re: capturing on both interfaces simultaneously abhinav narain (Dec 12)
- Re: capturing on both interfaces simultaneously Guy Harris (Dec 12)