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Asked: 2026-05-30T02:53:53+00:00

I have a very simple question, but I have not managed to find any

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I have a very simple question, but I have not managed to find any answers to it all weekend. I am using the sendto() function and it is returning error code 14: EFAULT. The man pages describe it as:

"An invalid user space address was specified for an argument."

I was convinced that this was talking about the IP address I was specifying, but now I suspect it may be the memory address of the message buffer that it is referring to – I can’t find any clarification on this anywhere, can anyone clear this up?

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1 Answer

  1. Editorial Team

    EFAULT It happen if the memory address of some argument passed to sendto (or more generally to any system call) is invalid. Think of it as a sort of SIGSEGV in kernel land regarding your syscall. For instance, if you pass a null or invalid buffer pointer (for reading, writing, sending, recieving…), you get that

    See errno(3), sendto(2) etc… man pages.

    EFAULT is not related to IP addresses at all.

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