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+'\" et
+.TH SETPGRP "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
+setpgrp
+\(em set the process group ID
+.SH SYNOPSIS
+.LP
+.nf
+#include <unistd.h>
+.P
+pid_t setpgrp(void);
+.fi
+.SH DESCRIPTION
+If the calling process is not already a session leader,
+\fIsetpgrp\fR()
+sets the process group ID of the calling process to the process ID of
+the calling process. If
+\fIsetpgrp\fR()
+creates a new session, then the new session has no controlling
+terminal.
+.P
+The
+\fIsetpgrp\fR()
+function has no effect when the calling process is a session leader.
+.SH "RETURN VALUE"
+Upon completion,
+\fIsetpgrp\fR()
+shall return the process group ID.
+.SH ERRORS
+No errors are defined.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+It is unspecified whether this function behaves as
+.IR setpgid (0,0)
+or
+\fIsetsid\fR()
+unless the process is already a session leader. Therefore, applications
+are encouraged to use
+\fIsetpgid\fR()
+or
+\fIsetsid\fR()
+as appropriate.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+The
+\fIsetpgrp\fR()
+function may be removed in a future version.
+.SH "SEE ALSO"
+.IR "\fIexec\fR\^",
+.IR "\fIfork\fR\^(\|)",
+.IR "\fIgetpid\fR\^(\|)",
+.IR "\fIgetsid\fR\^(\|)",
+.IR "\fIkill\fR\^(\|)",
+.IR "\fIsetpgid\fR\^(\|)",
+.IR "\fIsetsid\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.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 .