| TCSETPGRP(3) | Library Functions Manual | TCSETPGRP(3) | 
tcsetpgrp —
#include <unistd.h>
int
  
  tcsetpgrp(int
    fd, pid_t
  pgrp_id);
tcsetpgrp
  function sets the foreground process group ID associated with the terminal
  device to pgrp_id. The terminal device associated with
  fd must be the controlling terminal of the calling
  process and the controlling terminal must be currently associated with the
  session of the calling process. The value of pgrp_id
  must be the same as the process group ID of a process in the same session as
  the calling process.
Upon successful completion, tcsetpgrp
    returns a value of zero.
tcgetpgrp returns -1 and the global
  variable errno is set to indicate the error, as follows:
EBADF]EINVAL]ENOTTY]EPERM]tcsetpgprp function conforms to
  IEEE Std 1003.1-1990 (“POSIX.1”).
| June 4, 1993 | NetBSD 9.4 |