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+'\" et
+.TH TCGETPGRP "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH 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.
+.\"
+.SH NAME
+tcgetpgrp
+\(em get the foreground process group ID
+.SH SYNOPSIS
+.LP
+.nf
+#include <unistd.h>
+.P
+pid_t tcgetpgrp(int \fIfildes\fP);
+.fi
+.SH DESCRIPTION
+The
+\fItcgetpgrp\fR()
+function shall return the value of the process group ID of the
+foreground process group associated with the terminal.
+.P
+If there is no foreground process group,
+\fItcgetpgrp\fR()
+shall return a value greater than 1 that does not match the process
+group ID of any existing process group.
+.P
+The
+\fItcgetpgrp\fR()
+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.
+.SH "RETURN VALUE"
+Upon successful completion,
+\fItcgetpgrp\fR()
+shall return the value of the process group ID of the foreground
+process associated with the terminal. Otherwise, \-1 shall be
+returned and
+.IR errno
+set to indicate the error.
+.SH ERRORS
+The
+\fItcgetpgrp\fR()
+function shall fail if:
+.TP
+.BR EBADF
+The
+.IR fildes
+argument is not a valid file descriptor.
+.TP
+.BR ENOTTY
+The calling process does not have a controlling terminal, or the file
+is not the controlling terminal.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIsetsid\fR\^(\|)",
+.IR "\fIsetpgid\fR\^(\|)",
+.IR "\fItcsetpgrp\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<sys_types.h>\fP",
+.IR "\fB<unistd.h>\fP"
+.\"
+.SH 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 .
+.PP
+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 .