TCGETPGRP(P) POSIX Programmer's Manual TCGETPGRP(P)NAMEtcgetpgrp - get the foreground process group ID
SYNOPSIS
#include <unistd.h>
pid_t tcgetpgrp(int fildes);
DESCRIPTION
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 subse‐
quently changed by a process that is a member of a foreground process
group.
RETURN VALUE
Upon successful completion, tcgetpgrp() shall return the value of the
process group ID of the foreground process associated with the termi‐
nal. Otherwise, -1 shall be returned and errno set to indicate the
error.
ERRORS
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 controlling terminal.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOsetsid() , setpgid() , tcsetpgrp() , the Base Definitions volume of
IEEE Std 1003.1-2001, <sys/types.h>, <unistd.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 .
IEEE/The Open Group 2003 TCGETPGRP(P)
