TCSETPGRP(P) POSIX Programmer's Manual TCSETPGRP(P)
tcsetpgrp - set the foreground process group ID
int tcsetpgrp(int fildes, pid_t pgid_id);
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 process is blocking or ignoring SIGTTOU signals, the
process shall be allowed to perform the operation, and no signal is sent.
Upon successful completion, 0 shall be returned. Otherwise, -1 shall be returned and errno
set to indicate the error.
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.
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.
tcgetpgrp() , the Base Definitions volume of IEEE Std 1003.1-2001, <sys/types.h>,
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 TCSETPGRP(P)