TCGETPGRP(P) POSIX Programmer's Manual TCGETPGRP(P)
tcgetpgrp - get the foreground process group ID
pid_t tcgetpgrp(int fildes);
The tcgetpgrp() function shall return the value of the process group ID of the foreground
process group associated with the terminal.
If there is no foreground process group, tcgetpgrp() shall return a value greater than 1
that does not match the process group ID of any existing process group.
The tcgetpgrp() function is allowed from a process that is a member of a background
process group; however, the information may be subsequently changed by a process that is a
member of a foreground process group.
Upon successful completion, tcgetpgrp() shall return the value of the process group ID of
the foreground process associated with the terminal. Otherwise, -1 shall be returned and
errno set to indicate the error.
The tcgetpgrp() 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
The following sections are informative.
setsid() , setpgid() , tcsetpgrp() , the Base Definitions volume of IEEE Std 1003.1-2001,
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 TCGETPGRP(P)