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boddah
boddah
Last Activity: Feb 11 '11, 02:10 AM
Joined: Dec 26 '08
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  • boddah
    started a topic How to copy char * to char *array?
    in C

    How to copy char * to char *array?

    Hi all,
    I've been working on this code since morning and seems like I need stronger skills on pointers n arrays.
    I'm trying to read the content of a config file, which has x lines and then pass it to an array of characters.

    Not really sure if I did use the strtok function correctly, but here's what I got so far..

    Code:
    #include <stdio.h>
#include <stdlib.h>

#include <string.h>
    ...
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    • boddah
      replied to socket programming in C + multiple socket, same port num
      in C
      After creating the 1st socket, a client successfully connects to it and closed its connection. When the server tries to bind for the second socket, it fails and the app exits. Hence, the 2nd client unable to connect. Any way i can solve this?
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      • boddah
        replied to socket programming in C + multiple socket, same port num
        in C
        Yes Raghul, I'm aware of that. But still I'm unable to bind the socket to the port....
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        • boddah
          started a topic socket programming in C + multiple socket, same port num
          in C

          socket programming in C + multiple socket, same port num

          Hi all,
          I was trying to create 2 sockets to be able to establish 2 connections to a client. The first socket supposedly to facilitate the DH algo which I wanted to implement and the second socket to only accept byte streams as input. I always get "unable to bind" even though I've used the close() and shutdown() function to close the first socket. Can anyone help show me the way here?
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          • boddah
            replied to memcopying to a variable
            in C
            char temp[20];
            int a=0;
            for(int i=0;i<10;i++)
            {
            printf("%d", 20 * i);
            memcpy(temp[a], 2 * i, 1);
            a++;
            }
            Hi again. Sorry I forgot to include the initialization of a=0 in the 2nd snippet. Actually the for loop will printf an output of something like this printf("%c%c", <some formula here>);
            the for loop doesn't iterate at a fixed num so I'm just initializing...
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            • boddah
              started a topic memcopying to a variable
              in C

              memcopying to a variable

              Hi guys, I'm trying to copy the output from the for loop to a variable 'temp'

              for(int i=1;i<4;i++)
              {
              printf("%s", 2 * i); //outputs - 246
              }
              printf("\n");

              ----------------------------------------------------------
              I've tried this to only get 'segmentation fault'

              char temp[20];
              int a;
              for(int i=0;i<10;i++)
              {
              ...
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              • boddah
                replied to trouble with fork() and exec()
                in C
                Here's my fork & exec code:

                Code:
                , "Fork failed.\n");
		log_messaint spawn(int b, int a)
{
	int result;
	char msg[MAXLINE];
	pid_t mypid;

	mypid = fork();

	if(mypid < 0)
	{
		sprintf(msgge(RM_LOG_FILE, msg);
	}
	else if(mypid == 0)
	{
		printf("I'm the child\n");
		result = execlp("./myApp",
                ...
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                • boddah
                  replied to trouble with fork() and exec()
                  in C
                  Problem solved. Actually the prob wasn't with my Parent code but it was the other program code which I was trying to spawn. Added a while(1){} to the code and it worked well. Previously the code had exited (thru return 0) thus, resulting the myApp to appear <defunct> when spawned.
                  Thanks Raghu and cheers....
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                  • boddah
                    replied to trouble with fork() and exec()
                    in C
                    Thanks gpraghuram. I'll go thru the PDF file and update here again. BTW, do u have any sample of urs which I can refer to as well?
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                    • boddah
                      started a topic trouble with fork() and exec()
                      in C

                      trouble with fork() and exec()

                      Hi all,
                      I'm writing a manager application (Linux/C++) that'll spawn 2 instances of a program (myApp). The myApp program needs to stay alive after being spawned (both instances) so a 3rd party program could connect to them thru socket. My problem is at the fork and exec function which I'm not really familiar with yet. Could anyone help to point me in the right direction or maybe enlighten me with the correct usage of fork and exec.
                      Thanks...
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                      • boddah
                        replied to concatenating elements of an array
                        in C
                        ah..yes, no prob. it's supposed to be cr. my typo...
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                        • boddah
                          replied to concatenating elements of an array
                          in C
                          man..i still can't solve this.

                          unsigned char array[20];
                          char cr[21];
                          strncpy(cr, (char*)array,20 );
                          printf("aha:%s\ n",pcr);

                          -it still gives me segmentation fault. can someone pls help?
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                          • boddah
                            replied to concatenating elements of an array
                            in C
                            Thanks Jos...I've been using malloc and new but i always get a segmentation fault. I'm quite new to all this malloc and sizeof....
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                            • boddah
                              replied to concatenating elements of an array
                              in C
                              man...segmentat ion error..i cant figure it out. so i just use a short-cut. Write and append all those arrays to a file and then read 'em back as a string. thanks all
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                              • boddah
                                started a topic concatenating elements of an array
                                in C

                                concatenating elements of an array

                                Hi all,
                                I've been trying to get this working for days but I still couldn't get it.

                                snippet:
                                unsigned char *a;
                                unsigned msg[5];

                                I want to concatenate all 5 elements from array msg to the unsigned char *a.
                                Lets say
                                msg[0]="abc";
                                msg[1]="def";
                                msg[2]="ghi";
                                msg[3]="jkl";
                                msg[4]="mno";

                                and in the end a would point...
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