Programming Forums - Basic Socket Programming Error in Linux.. Pls help

Programming Forums (http://www.programmingforums.org/forumindex.php)

- C++ (http://www.programmingforums.org/forum15.html)

- - Basic Socket Programming Error in Linux.. Pls help (http://www.programmingforums.org/showthread.php?t=13936)

Basic Socket Programming Error in Linux.. Pls help

Hi! I don't have experiance in linux C programming. I took a linux socket programming book and tried the first example code but It didn't work. I use these codes.. please help me!
Thanks for your replies

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

int

main(int argc,char **argv) {

    int z;                   /* Status return code */

    int s[2];                /* Pair of sockets */

    /*

      * Create a pair of local sockets:

      */

    z = socketpair(AF_LOCAL,SOCK_STREAM,0,s);

    if ( z == -1 ) {

         fprintf(stderr,

             �%s: socketpair(AF_LOCAL,SOCK_STREAM,0)\n�,

             strerror(errno));

         return 1;           /* Failed */

    }

    /*

      * Report the socket file descriptors returned:

      */

    printf(�s[0] = %d;\n�,s[0]);

    printf(�s[1] = %d;\n�,s[1]);

    system(�netstat --unix -p�);

    return 0;

}

Error Message:

bora.c: In function �main�:

bora.c:18: error: stray �\342� in program

bora.c:18: error: stray �\200� in program

bora.c:18: error: stray �\234� in program

bora.c:18: error: expected expression before �%� token

bora.c:18: error: stray �\� in program

bora.c:18: error: stray �\342� in program

bora.c:18: error: stray �\200� in program

bora.c:18: error: stray �\235� in program

bora.c:25: error: stray �\342� in program

bora.c:25: error: stray �\200� in program

bora.c:25: error: stray �\234� in program

bora.c:25: error: expected expression before �%� token

bora.c:25: error: stray �\� in program

bora.c:25: error: stray �\342� in program

bora.c:25: error: stray �\200� in program

bora.c:25: error: stray �\235� in program

bora.c:26: error: stray �\342� in program

bora.c:26: error: stray �\200� in program

bora.c:26: error: stray �\234� in program

bora.c:26: error: expected expression before �%� token

bora.c:26: error: stray �\� in program

bora.c:26: error: stray �\342� in program

bora.c:26: error: stray �\200� in program

bora.c:26: error: stray �\235� in program

bora.c:27: error: stray �\342� in program

bora.c:27: error: stray �\200� in program

bora.c:27: error: stray �\234� in program

bora.c:27: error: �netstat� undeclared (first use in this function)

bora.c:27: error: (Each undeclared identifier is reported only once

bora.c:27: error: for each function it appears in.)

bora.c:27: error: expected �)� before numeric constant

bora.c:27: error: stray �\342� in program

bora.c:27: error: stray �\200� in program

bora.c:27: error: stray �\235� in program

I used this command to compile

gcc bora.c -o bora `pkg-config --cflags --libs gtk+-2.0`

You cannot use quotes of the opening/closing type. Use the ordinary double-quote character, ".

First of all, Thanks for your reply DaWei.
As I see, I didn't use ' character instead of " in my codes. My english isn't very well so, I couldn't understand where I did a mistake. Can you edit for me then I will be able to understand these codes correctly.

This: “s[0] = %d;\n” is not the same thing as
this: "s[0] = %d;\n"

ok! I will try '' in a moment. I'll write what terminal displays.

Bear in mind that " is a single character, not two of these: '

Crap, man, I have no idea what kind of keyboard you have, or even where you're getting the open/close variety of double-quote. Presuming you have a normal American/English keyboard, look at the dam' key just to the left of ENTER. It has a double quote and a single quote on it. Press SHIFT to get the double quote. Don't use some kind of editor or word-processor that substitutes in the open/close variety.

Ok sir , I understand what you say , I tried again then terminal said ;

I wrote these codes :

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <errno.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

int

main(int argc,char **argv) {

    int z;                   /* Status return code */

    int s[2];                /* Pair of sockets */

    /*

      * Create a pair of local sockets:

      */

    z = socketpair(AF_LOCAL,SOCK_STREAM,0,s);

    if ( z == -1 ) {

         fprintf(stderr,

            ''%s: socketpair(AF_LOCAL,SOCK_STREAM,0)\n'',

             strerror(errno));

         return 1;           /* Failed */

    }

    /*

      * Report the socket file descriptors returned:

      */

    printf(''s[0] = %d;\n'',s[0]);

    printf(''s[1] = %d;\n'',s[1]);

    system(''netstat --unix -p'');

    return 0;

}

bora@ciner:~/Desktop> gcc bora.c -o bora `pkg-config --cflags --libs gtk+-2.0`

bora.c:18:13: error: empty character constant

bora.c: In function �main�:

bora.c:18: error: invalid operands to binary %

bora.c:18: error: expected �)� before �:� token

bora.c:18: error: stray �\� in program

bora.c:18:55: error: empty character constant

bora.c:25:12: error: empty character constant

bora.c:25: error: expected �)� before �s�

bora.c:25: error: stray �\� in program

bora.c:25:26: error: empty character constant

bora.c:26:12: error: empty character constant

bora.c:26: error: expected �)� before �s�

bora.c:26: error: stray �\� in program

bora.c:26:26: error: empty character constant

bora.c:27:12: error: empty character constant

bora.c:27: error: expected �)� before �netstat�

bora.c:27:31: error: empty character constant

I think there are less errors then the other , but I can't compile it again.. :(

See my previous response. You may have additional problems, but you need to get around this one, first.

I have put '' (by pressing 2 times) character instead of " which is created by pressing one time. there are errors again :( but aren't as much as it was

Don't use two single quotes! Use one double quote!
I don't know any other way to say that, without getting unduly profane.