Hi all
i need to reuse the otput of an application but i dont wanto to
redirect the output i need to display.
my idea is: open a new terminal, copy the the configuration of the
current terminal into the new one, fork the child read from new term
and write to output the parent dup2(newterm_fd, 1) so exec the
program.
if i use a normal fifo its work but if i exec /bin/ls who call istty()
on the fd do a oter output.
the code dont work.... but i do know why???
ideas??
tnks!

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <util.h>
#include <errno.h>


main() {
  int pid;

  int amaster;
  int aslave;
  char *name = valloc(1024);
  //for new terminal
  struct termios * termp = valloc(sizeof(struct termios));
  //current terminal
  struct termios * ioterm = valloc(sizeof(struct termios));
  struct winsize *win = valloc(sizeof(struct winsize));

  int ret = openpty(&amaster, &aslave, name, termp, win);

  //opening new terminal
  int fifofd = open(name , O_RDWR | O_NOCTTY | O_NDELAY);

  //copyng the configuration of the current terminal on the new
terminal
  tcgetattr(STDOUT_FILENO, ioterm);
  tcsetattr(fifofd, TCSANOW ,ioterm);

  //now whe fork the child read from the new terminal and print on
STDOUT
  // the parent close STDOUT and print on the new terminal
  pid = fork();

  if (pid == 0 ){
    //child
    char *buff[512];
    int br = 0;
    int r = 0;
    //reopen for non sharing seek position maybe util?
    fifofd = open(name , O_RDWR | O_NOCTTY | O_NDELAY);
    while(1){
      br = read(fifofd, buff, 1);
      if (br >0 ) {
	write(STDOUT_FILENO, buff, br);
        // use buff in oter way :)
      } else {
        r = errno;
      }

    }

  }else {
    //parent
    //close stdout now all operation are on fifofd
    dup2(fifofd, STDOUT_FILENO);
    ///exec application :)
    while (1) {
      printf("TEST: Can you see this?\n");
    }
  }


}

On Sat, 19 Mar 2011 07:11:26 -0700 (PDT)
Paolo Picci <paolo.picci@gmail.com> wrote:
> Hi all

Hello. For your question you need comp.unix.programmer not comp.lang.c
I have crossposted and set follow-ups.

> i need to reuse the otput of an application but i dont wanto to
> redirect the output i need to display.
> my idea is: open a new terminal, copy the the configuration of the
> current terminal into the new one, fork the child read from new term
> and write to output the parent dup2(newterm_fd, 1) so exec the
> program.
> if i use a normal fifo its work but if i exec /bin/ls who call istty()
> on the fd do a oter output.
> the code dont work.... but i do know why???
> ideas??
> tnks!
> 
> #include <stdio.h>
> #include <unistd.h>
> #include <fcntl.h>
> #include <util.h>
> #include <errno.h>
> 
> 
> main() {
>   int pid;
> 
>   int amaster;
>   int aslave;
>   char *name = valloc(1024);
>   //for new terminal
>   struct termios * termp = valloc(sizeof(struct termios));
>   //current terminal
>   struct termios * ioterm = valloc(sizeof(struct termios));
>   struct winsize *win = valloc(sizeof(struct winsize));
> 
>   int ret = openpty(&amaster, &aslave, name, termp, win);
> 
>   //opening new terminal
>   int fifofd = open(name , O_RDWR | O_NOCTTY | O_NDELAY);
> 
>   //copyng the configuration of the current terminal on the new
> terminal
>   tcgetattr(STDOUT_FILENO, ioterm);
>   tcsetattr(fifofd, TCSANOW ,ioterm);
> 
>   //now whe fork the child read from the new terminal and print on
> STDOUT
>   // the parent close STDOUT and print on the new terminal
>   pid = fork();
> 
>   if (pid == 0 ){
>     //child
>     char *buff[512];
>     int br = 0;
>     int r = 0;
>     //reopen for non sharing seek position maybe util?
>     fifofd = open(name , O_RDWR | O_NOCTTY | O_NDELAY);
>     while(1){
>       br = read(fifofd, buff, 1);
>       if (br >0 ) {
> 	write(STDOUT_FILENO, buff, br);
>         // use buff in oter way :)
>       } else {
>         r = errno;
>       }
> 
>     }
> 
>   }else {
>     //parent
>     //close stdout now all operation are on fifofd
>     dup2(fifofd, STDOUT_FILENO);
>     ///exec application :)
>     while (1) {
>       printf("TEST: Can you see this?\n");
>     }
>   }
> 
> 
> }

> On Sat, 19 Mar 2011 07:11:26 -0700 (PDT)
> Paolo Picci <paolo.picci@gmail.com> wrote:

>> i need to reuse the otput of an application but i dont wanto to
>> redirect the output i need to display.

tee
http://empty.sourceforge.net
http://expect.nist.gov/