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From: Sabyasachi Ruj <ruj.sabya@gmail.com>
Date: Thu, 10 Mar 2011 19:40:40 +0530
Message-ID: <AANLkTimctF1XJZT+VGNRg6Vj=UTsLFur+yu8gar-uF0k@mail.gmail.com>
Subject: Re: Strange behavior if I am declaring a struct String_vector
 variable
To: user@zookeeper.apache.org
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Oops. I forgot the NULL pointer at the end of argv. My mistake!

On 10 March 2011 18:47, Sabyasachi Ruj <ruj.sabya@gmail.com> wrote:
> I have two programs "trysample.cpp" and "sample.cpp". trysample.cpp
> calls execv to invoke "sample", that is, compiled output of "sample.cpp".
>
> sample.cpp simply prints the command line arguments passed to it.
>
> The strange thing is if I am declaring a "struct String_vector"
> variable in "trysample.cpp", the arguments received by sample.cpp
> becomes wrong. If I am passing 3 arguments, it is showing us 5
> arguments have been passed. But if I just comment the "struct
> String_vector s;" part, it works fine!
>
> Any idea?
>
> I am giving code for both programs:
>
> sample.cpp
> =3D=3D=3D=3D=3D=3D=3D=3D=3D
> #include<stdio.h>
> #include<unistd.h>
> #include<stdlib.h>
>
> int main(int argc, char *argv[])
> {
> =A0printf ("Number of arugments received: %d\n", argc);
> =A0for (int i =3D 0; i < argc; i++) {
> =A0 =A0printf("%s\n", argv[i]);
> =A0}
> }
>
>
> trysample.cpp
> =3D=3D=3D=3D=3D=3D=3D=3D=3D
> #include <unistd.h>
> #include <stdlib.h>
> #include <errno.h>
> #include "zookeeper.h"
>
>
> int main(int argc, char *argv[])
> {
> =A0struct String_vector s;
> =A0int pid =3D fork();
> =A0if (pid =3D=3D 0) {
> =A0 =A0char * argv[] =3D
> {"/var/www/vhosts/apps.w/subdomains/sr.c/httpdocs/c/zookeeper/tests/sampl=
e",
> "aaa", "ddd"};
> =A0 =A0execv("/var/www/vhosts/apps.w/subdomains/sr.c/httpdocs/c/zookeeper=
/tests/sample",
> argv);
> =A0 =A0printf("returned error! %d\n", errno);
> =A0}
> }
>
>
>
>
> --
> Sabyasachi
>


--=20
Sabyasachi