The tcgetsid() function shall obtain the process group ID of
the session for which the terminal specified by
fildes is the controlling terminal.
RETURN VALUE
Upon successful completion, tcgetsid() shall return the process
group ID associated with the terminal. Otherwise, a value
of (pid_t)-1 shall be returned and errno set to indicate
the error.
ERRORS
The tcgetsid() function shall fail if:
EBADF
The fildes argument is not a valid file descriptor.
ENOTTY
The calling process does not have a controlling terminal, or the file
is not the controlling terminal.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
The Base Definitions volume of IEEE Std 1003.1-2001, <termios.h>
COPYRIGHT
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 original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
