tcgetpgrp - phpMan

TCGETPGRP(3)               Linux Programmer’s Manual              TCGETPGRP(3)



NAME
       tcgetpgrp, tcsetpgrp - get and set terminal foreground process group

SYNOPSIS
       #include <unistd.h>

       pid_t tcgetpgrp(int fd);

       int tcsetpgrp(int fd, pid_t pgrp);

DESCRIPTION
       The  function  tcgetpgrp()  returns  the process group ID of the foreground process
       group on the terminal associated to fd, which must be the controlling  terminal  of
       the calling process.

       The  function  tcsetpgrp()  makes  the process group with process group ID pgrp the
       foreground process group on the terminal associated to fd, which must be  the  con-
       trolling terminal of the calling process, and still be associated with its session.
       Moreover, pgrp must be a (nonempty) process group belonging to the same session  as
       the calling process.

       If  tcsetpgrp() is called by a member of a background process group in its session,
       and the calling process is not blocking or ignoring SIGTTOU, a  SIGTTOU  signal  is
       sent to all members of this background process group.

RETURN VALUE
       When  fd  refers  to  the controlling terminal of the calling process, the function
       tcgetpgrp() will return the foreground process group ID of that terminal  if  there
       is  one, and some value larger than 1 that is not presently a process group ID oth-
       erwise.  When fd does not refer to the controlling terminal of the calling process,
       -1 is returned, and errno is set appropriately.

       When  successful, tcsetpgrp() returns 0. Otherwise, it returns -1, and errno is set
       appropriately.

ERRORS
       EBADF  fd is not a valid file descriptor.

       EINVAL pgrp has an unsupported value.

       EPERM  pgrp has a supported value, but is not the process group ID of a process  in
              the same session as the calling process.

       ENOTTY The  calling process does not have a controlling terminal, or it has one but
              it is not described by fd, or, for tcsetpgrp(), this controlling terminal is
              no longer associated with the session of the calling process.

NOTES
       These functions are implemented via the TIOCGPGRP and TIOCSPGRP ioctls.

HISTORY
       These ioctls appeared in 4.2 BSD. The functions are POSIX inventions.

CONFORMS TO
       POSIX.1

SEE ALSO
       setpgid(2), setsid(2)



POSIX                             2003-01-28                      TCGETPGRP(3)

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