PROLOG

       This  manual  page  is part of the POSIX Programmer's Manual.  The Linux implementation of
       this interface may differ (consult the corresponding Linux  manual  page  for  details  of
       Linux behavior), or the interface may not be implemented on Linux.

NAME

       tcsetpgrp — set the foreground process group ID

SYNOPSIS

       #include <unistd.h>

       int tcsetpgrp(int fildes, pid_t pgid_id);

DESCRIPTION

       If  the  process  has a controlling terminal, tcsetpgrp() shall set the foreground process
       group ID associated with the terminal to pgid_id.  The application shall ensure  that  the
       file  associated  with  fildes  is the controlling terminal of the calling process and the
       controlling terminal is currently associated with the session of the calling process.  The
       application shall ensure that the value of pgid_id matches a process group ID of a process
       in the same session as the calling process.

       Attempts to use tcsetpgrp() from a process which is a member of a background process group
       on  a  fildes associated with its controlling terminal shall cause the process group to be
       sent a SIGTTOU signal. If the calling thread is blocking SIGTTOU signals or the process is
       ignoring  SIGTTOU  signals,  the process shall be allowed to perform the operation, and no
       signal is sent.

RETURN VALUE

       Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno
       set to indicate the error.

ERRORS

       The tcsetpgrp() function shall fail if:

       EBADF  The fildes argument is not a valid file descriptor.

       EINVAL This implementation does not support the value in the pgid_id argument.

       EIO    The  process  group  of  the writing process is orphaned, the calling thread is not
              blocking SIGTTOU, and the process is not ignoring SIGTTOU.

       ENOTTY The calling process does not have a controlling terminal, or the file  is  not  the
              controlling  terminal, or the controlling terminal is no longer associated with the
              session of the calling process.

       EPERM  The value of pgid_id is a value supported by the implementation, but does not match
              the process group ID of a process in the same session as the calling process.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       tcgetpgrp()

       The Base Definitions volume of POSIX.1‐2017, <sys_types.h>, <unistd.h>

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1-2017, Standard for Information Technology -- Portable  Operating  System  Interface
       (POSIX),  The  Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by
       the Institute of Electrical and Electronics Engineers, Inc and The  Open  Group.   In  the
       event  of  any  discrepancy  between this version and the original IEEE and The Open Group
       Standard, the original IEEE and The Open Group  Standard  is  the  referee  document.  The
       original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

       Any  typographical  or  formatting errors that appear in this page are most likely to have
       been introduced during the conversion of the source files to man page  format.  To  report
       such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .