Linux internals

prafu · 09-17-2011, 01:22 PM

hi,

I'm studying linux internals programming. can anyone tell me what is wrong in the following program? it hangs at the open statement.... I'm getting the "1" value which mkfifo returns...

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include<fcntl.h>
int main()
{
int a,b=4,fid;
printf("\n\n Hello World \n\n");
a=mkfifo("new",0666);
printf("\n mkfifo returnes : %d\n",a);
fid=open("new",O_WRONLY,0777);
printf("given number is : %d",b);
write(fid,&b,sizeof(b));
close(fid);
return 0;
}

acid_kewpie · 09-17-2011, 01:42 PM

please use useful and informative thread titles in future.

This thread will shortly be moved to the Programming forum.

archtoad6 · 09-17-2011, 05:58 PM

Welcome to LQ. Hope your time here helps you as much as mine has helped me.

Please put code, command line output, config files, etc. inside [CODE] tags, aka "Code:" blocks.

It will make your posts easier to read, & that will get you more, faster, better answers. -- Help us help you.
BTW, You can edit your post(s) to do this retroactively. Please do so soon.

Thank you, & again, welcome.

Moved: This thread is more suitable in Programming and has been moved accordingly to help your thread/question get the exposure it deserves.

P.S. I tried to fix your "Help me" title.

ta0kira · 09-17-2011, 08:33 PM

Quote:

Originally Posted by prafu

hi,

I'm studying linux internals programming. can anyone tell me what is wrong in the following program? it hangs at the open statement.... I'm getting the "1" value which mkfifo returns...

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<unistd.h>
#include<fcntl.h>
int main()
{
int a,b=4,fid;
printf("\n\n Hello World \n\n");
a=mkfifo("new",0666);
printf("\n mkfifo returnes : %d\n",a);
fid=open("new",O_WRONLY,0777);
printf("given number is : %d",b);
write(fid,&b,sizeof(b));
close(fid);
return 0;
}

open in write mode will block until the same pipe is opened in read mode.
Kevin Barry