Programming Forums > Application Development > C++

boraciner · Sep 7th, 2007, 8:52 AM

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

(Toggle Plain Text)

#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:

(Toggle Plain Text)

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

(Toggle Plain Text)

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

DaWei · Sep 7th, 2007, 11:08 AM

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

boraciner · Sep 8th, 2007, 6:47 AM

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.

DaWei · Sep 8th, 2007, 6:56 AM

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

boraciner · Sep 8th, 2007, 7:40 AM

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

DaWei · Sep 8th, 2007, 7:50 AM

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.

boraciner · Sep 8th, 2007, 7:54 AM

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

I wrote these codes :

(Toggle Plain Text)

#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;
}

(Toggle Plain Text)

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..

DaWei · Sep 8th, 2007, 7:55 AM

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

boraciner · Sep 8th, 2007, 8:00 AM

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

DaWei · Sep 8th, 2007, 8:12 AM

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

Sep 7th, 2007, 8:52 AM	#1
boraciner Programmer Join Date: Nov 2005 Location: Turkey Posts: 93 Rep Power: 3	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 (Toggle Plain Text) #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; } #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: (Toggle Plain Text) 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 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 (Toggle Plain Text) gcc bora.c -o bora `pkg-config --cflags --libs gtk+-2.0` gcc bora.c -o bora `pkg-config --cflags --libs gtk+-2.0`

Sep 7th, 2007, 11:08 AM	#2
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	You cannot use quotes of the opening/closing type. Use the ordinary double-quote character, ". __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Sep 8th, 2007, 6:56 AM	#4
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	This: “s[0] = %d;\n” is not the same thing as this: "s[0] = %d;\n" __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Sep 8th, 2007, 7:50 AM	#6
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	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. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Sep 8th, 2007, 7:54 AM	#7
boraciner Programmer Join Date: Nov 2005 Location: Turkey Posts: 93 Rep Power: 3	Ok sir , I understand what you say , I tried again then terminal said ; I wrote these codes : (Toggle Plain Text) #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; } #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; } (Toggle Plain Text) 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 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..

Sep 8th, 2007, 6:47 AM	#3
boraciner Programmer Join Date: Nov 2005 Location: Turkey Posts: 93 Rep Power: 3	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.

Sep 8th, 2007, 7:40 AM	#5
boraciner Programmer Join Date: Nov 2005 Location: Turkey Posts: 93 Rep Power: 3	ok! I will try '' in a moment. I'll write what terminal displays.

Sep 8th, 2007, 7:55 AM	#8
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	See my previous response. You may have additional problems, but you need to get around this one, first. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Sep 8th, 2007, 8:00 AM	#9
boraciner Programmer Join Date: Nov 2005 Location: Turkey Posts: 93 Rep Power: 3	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

Sep 8th, 2007, 8:12 AM	#10
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Don't use two single quotes! Use one double quote! I don't know any other way to say that, without getting unduly profane. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
The basic of basic in programming...	Simongcc	Software Design and Algorithms	4	Aug 16th, 2007 3:34 AM
Slackware installation guide for Linux beginners	coldDeath	Coder's Corner Lounge	104	Jul 29th, 2007 4:40 AM

Programming Forums > Application Development > C++

Basic Socket Programming Error in Linux.. Pls help