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tcgetpgrp (3)
  • tcgetpgrp (3) ( Solaris man: Библиотечные вызовы )
  • tcgetpgrp (3) ( FreeBSD man: Библиотечные вызовы )
  • tcgetpgrp (3) ( Русские man: Библиотечные вызовы )
  • >> tcgetpgrp (3) ( Linux man: Библиотечные вызовы )
  • tcgetpgrp (3) ( POSIX man: Библиотечные вызовы )
  •  

    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 controlling terminal of the calling process, and still be associated with its session. Moreover, pgrp must be a (non-empty) 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 otherwise. 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.
    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.
    EPERM
    pgrp has a supported value, but is not the process group ID of a process in the same session as the calling process.
     

    CONFORMING TO

    POSIX.1-2001.  

    NOTES

    These functions are implemented via the TIOCGPGRP and TIOCSPGRP ioctls.  

    History

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

    SEE ALSO

    setpgid(2), setsid(2), credentials(7)  

    COLOPHON

    This page is part of release 3.14 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    CONFORMING TO
    NOTES
    History
    SEE ALSO
    COLOPHON


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