Confusion over fork()

[ilikesuresh]

Hi I wrote the following program

[code=c]int main()
{
//pid_t cpid,ppid;
unsigned int status;
if(fork() == 0){
printf("\nChild Process ID%d",getpid()) ;
scanf("\nEnter The Status:%d",&sta tus);
exit(status);
}
else
{
wait(&status);
printf("\nParen t Process ID%d",getpid()) ;
printf("\nChild exit status =%d\n",status > 8);
}
}[/code]


when i executing the line
[code=c]scanf("\nEnter The Status:%d",&sta tus);[/code] is not executing.
and then always it gives the child exit status 1
What is the reason for this one?
plz clarify me
Thanks

[pbmods]

Heya, ilikesuresh.

You posted this in the Articles section. I'll go ahead and move it to the Forum where an Expert will be more likely to find it.

Please use CODE tags when posting source code:

[CODE=c]
Source code goes here.
[/CODE]

[arne]

The code line is executed, only the result is not what you expect :)

A look into the man page of wait reveals that the status returned by wait is storing status information about the child. Among this info you can also find the exit status, but this information has to be extracted by a macro. Try the following:

[CODE=c]
int main( void )
{

int status;

if(fork() == 0) {

printf("\nChild Process ID%d",getpid()) ;
printf( "\nEnter the exit status: " );
scanf("%d",&sta tus);

exit(status);

} else {

wait(&status);

printf("\nParen t Process ID%d",getpid()) ;
printf("\nChild exit status =%d\n", WEXITSTATUS(sta tus));
}

return 0;
}
[/CODE]

HTH,
arne

[cmstvm]

data sharing in process

hello,
i am Anish here.I have a doubt.If we change any variables in the process ,is it visible for the parent?
expecting replay
regards
Anish

[arne]

hello,
i am Anish here.I have a doubt.If we change any variables in the process ,is it visible for the parent?
expecting replay
regards
Anish

No, they are not visible.

arne