Thread: Segmentation fault, core dumped

  1. #1
    Registered User
    Join Date
    Apr 2007

    Segmentation fault, core dumped

    I'm compiling with gcc and with -O2 optimisation.
    Here's the code:

    #include <stdio.h>
    #include <unistd.h>
    #include <stdlib.h>
    #include <sys/io.h>
    #define PORT1 0x3F8
    if (ioperm(PORT1, 4, 1)) {perror("ioperm"); exit(1);}
    char a;
    outb_p(0 , PORT1 + 1); /* No interupts*/
    outb_p(0x80 , PORT1 + 3); /* DLab*/
    outb_p(0x02 , PORT1 + 0); /*Baud Rate--Low byte?*/
    outb_p(0x03 , PORT1 + 3); /* * 8 Bits, No Parity, 1 Stop Bit */
    /*outb_p(0x0B , PORT1 + 4); /* Turn on DTR, RTS, and OUT2 */
    /*Roomba Control*/
    printf("Roomba go!\n");
    outb_p(128, PORT1); /* Begin SCI*/
    outb_p(130, PORT1); /* Go To Safe Mode*/
    outb_p(132, PORT1); /* Go To Full Mode*/
    outb_p(137, PORT1);
    outb_p(255, PORT1);
    outb_p(56, PORT1);
    outb_p(128, PORT1);
    outb_p(0, PORT1);
    while(a != 'a')
    a = getchar();
    printf("Roomba stop!\n");
    outb_p(137, PORT1);
    outb_p(0, PORT1);
    outb_p(0, PORT1);
    outb_p(0, PORT1);
    outb_p(0, PORT1);
    I have to use sudo to run it or the ioperm won't work. I get a segmentation fault (core dumped) error.

  2. #2
    Hurry Slowly vart's Avatar
    Join Date
    Oct 2006
    Rishon LeZion, Israel
    Are you compiling as C++ Or C99?

    What line does the segfault happens? Could you remove all lines afterwards and explain the function you are calling in this line?
    All problems in computer science can be solved by another level of indirection,
    except for the problem of too many layers of indirection.
    David J. Wheeler

  3. #3
    Join Date
    May 2007
    Berkeley, CA
    Hmmm..... the coding style and question looks remarkably similar to the following

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