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man:tcsetpgrp

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  con-
     trolling 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
     (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 SIGT-
     TOU, 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.

ATTRIBUTES

     For   an   explanation   of   the  terms  used  in  this  section,  see
     attributes(7).
     allbox; lbw24 lb lb l l l.  Interface Attribute Value  T{  tcgetpgrp(),
     tcsetpgrp() T}   Thread safety  MT-Safe

CONFORMING TO

     POSIX.1-2001, POSIX.1-2008.

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 4.16 of the Linux  man-pages  project.   A
     description  of  the project, information about reporting bugs, and the
     latest    version    of    this    page,    can     be     found     at
     https://www.kernel.org/doc/man-pages/.

GNU 2015-08-08 TCGETPGRP(3)

/data/webs/external/dokuwiki/data/pages/man/tcsetpgrp.txt · Last modified: 2019/05/17 09:47 by 127.0.0.1

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