A tcp connetion question

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  • Jimmy
    #1

    A tcp connetion question

    They r two processes, for client and server, connected with TCP. Connection
    is OK.
    I killed the server process, while the client seems not to feel that before
    it sent some data by calling send().
    And it checked the errno, which indicated a segmentation fault error.

    Why should it be segmentation fault rather than something indicating
    disconnection?


    Tags: None
    • Nick Keighley
      #2
      Re: A tcp connetion question

      On 27 Jun, 11:06, "Jimmy" <lofe...@yahoo. com.cnwrote:
      They r two processes, for client and server, connected with TCP. Connection
      is OK.
      I killed the server process, while the client seems not to feel that before
      it sent some data by calling send().
      And it checked the errno, which indicated a segmentation fault error.
      >
      Why should it be segmentation fault rather than something indicating
      disconnection?
      standard C has no support for TCP you need to ask on a platform
      specific group (eg. Windows or Unix). It might be an idea to post
      your code when you do that. I suspect the client is ignoring some
      error indication.


      --
      Nick Keighley

        Comment

        • Jimmy
          #3
          Re: A tcp connetion question

          standard C has no support for TCP you need to ask on a platform
          specific group (eg. Windows or Unix). It might be an idea to post
          your code when you do that. I suspect the client is ignoring some
          error indication.
          >
          >
          --
          Nick Keighley
          >
          Well, I realize the segmentation fault was caused by perror(errno), in which
          errno has the value of 29. Is that an invalid number?


            Comment

            • Richard Tobin
              #4
              Re: A tcp connetion question

              In article <f5tmkv$78u$1@n ews.cn99.com>, Jimmy <lofenee@yahoo. com.cnwrote:
              >Well, I realize the segmentation fault was caused by perror(errno), in which
              >errno has the value of 29. Is that an invalid number?
              Error numbers are implementation defined.

              A segmentation fault in perror() may well indicate some unrelated
              memory corruption, or that you have closed stderr.

              -- Richard
              --
              "Considerat ion shall be given to the need for as many as 32 characters
              in some alphabets" - X3.4, 1963.

                Comment

                • Nick Keighley
                  #5
                  Re: A tcp connetion question

                  On 27 Jun, 12:55, "Jimmy" <lofe...@yahoo. com.cnwrote:

                  - leave in attributions
                  - leave in what you are replying to
                  standard C has no support for TCP you need to ask on a platform
                  specific group (eg. Windows or Unix). It might be an idea to post
                  your code when you do that. I suspect the client is ignoring some
                  error indication.
                  >
                  --
                  Nick Keighley
                  - don't quote signatures

                  Well, I realize the segmentation fault was caused by perror(errno), in which
                  errno has the value of 29. Is that an invalid number?
                  which part of "you need to ask on a platform specific group" didn't
                  you understand?

                  --
                  Nick Keighley

                  My god it's full of stars!
                  Dave Bowman, on seeing HAL's source code

                    Comment

                    • Richard
                      #6
                      Re: A tcp connetion question

                      Nick Keighley <nick_keighley_ nospam@hotmail. comwrites:
                      On 27 Jun, 12:55, "Jimmy" <lofe...@yahoo. com.cnwrote:
                      >
                      - leave in attributions
                      - leave in what you are replying to
                      >
                      standard C has no support for TCP you need to ask on a platform
                      specific group (eg. Windows or Unix). It might be an idea to post
                      your code when you do that. I suspect the client is ignoring some
                      error indication.
                      >>
                      --
                      >Nick Keighley
                      >
                      - don't quote signatures
                      >
                      >
                      >Well, I realize the segmentation fault was caused by perror(errno), in which
                      >errno has the value of 29. Is that an invalid number?
                      >
                      which part of "you need to ask on a platform specific group" didn't
                      you understand?
                      Which part of "my god, haven't you become a bossy little twit" do you
                      not understand?

                        Comment

                        • CBFalconer
                          #7
                          Re: A tcp connetion question

                          Richard wrote:
                          Nick Keighley <nick_keighley_ nospam@hotmail. comwrites:
                          >On 27 Jun, 12:55, "Jimmy" <lofe...@yahoo. com.cnwrote:
                          >>
                          >- leave in attributions
                          >- leave in what you are replying to
                          >>
                          >>>standard C has no support for TCP you need to ask on a platform
                          >>>specific group (eg. Windows or Unix). It might be an idea to post
                          >>>your code when you do that. I suspect the client is ignoring some
                          >>>error indication.
                          >>>
                          >>>--
                          >>>>Nick Keighley
                          >>
                          >- don't quote signatures
                          >>
                          >>Well, I realize the segmentation fault was caused by perror(errno),
                          >>in which errno has the value of 29. Is that an invalid number?
                          >>
                          >which part of "you need to ask on a platform specific group" didn't
                          >you understand?
                          >
                          Which part of "my god, haven't you become a bossy little twit" do you
                          not understand?
                          You are obviously totally unaware that contravention of standard
                          Usenet practice needs to be stamped on (and pointed out) at the
                          earliest possible moment. "Jimmy" is obviously a new user, and
                          unaware, and in need of information. Maybe also reading lessons.

                          --
                          <http://www.cs.auckland .ac.nz/~pgut001/pubs/vista_cost.txt>
                          <http://www.securityfoc us.com/columnists/423>
                          <http://www.aaxnet.com/editor/edit043.html>
                          cbfalconer at maineline dot net



                          --
                          Posted via a free Usenet account from http://www.teranews.com

                            Comment

                            • SM Ryan
                              #8
                              Re: A tcp connetion question

                              "Jimmy" <lofenee@yahoo. com.cnwrote:
                              # They r two processes, for client and server, connected with TCP. Connection
                              # is OK.
                              # I killed the server process, while the client seems not to feel that before
                              # it sent some data by calling send().
                              # And it checked the errno, which indicated a segmentation fault error.
                              #
                              # Why should it be segmentation fault rather than something indicating
                              # disconnection?

                              Most likely problem is your error-handling code is blown. You need
                              to capture the failure and find out where it is happenning. If you
                              have a debugger, that should point directly to the fault; otherwise
                              you can sprinkle printfs through the code to verify it is operating
                              as expected.

                              If you are using signal handlers, it's not safe to do I/O from there.

                              --
                              SM Ryan http://www.rawbw.com/~wyrmwif/
                              We found a loophole; they can't keep us out anymore.

                                Comment

                                • Gordon Burditt
                                  #9
                                  Re: A tcp connetion question

                                  >standard C has no support for TCP you need to ask on a platform
                                  >specific group (eg. Windows or Unix). It might be an idea to post
                                  >your code when you do that. I suspect the client is ignoring some
                                  >error indication.
                                  >>
                                  >>
                                  >--
                                  >Nick Keighley
                                  >>
                                  >
                                  >Well, I realize the segmentation fault was caused by perror(errno), in which
                                  >errno has the value of 29. Is that an invalid number?
                                  The first argument of perror() is supposed to be a *STRING*, which
                                  errno is not. This probably caused a segmentation fault. Guess what,
                                  nitpickers, this actually is a question about C.

                                    Comment

                                    • Jimmy
                                      #10
                                      Re: A tcp connetion question

                                      The first argument of perror() is supposed to be a *STRING*, which
                                      errno is not. This probably caused a segmentation fault. Guess what,
                                      nitpickers, this actually is a question about C.
                                      >
                                      Thanks a lot. I done made a blunt mistake!


                                        Comment

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