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+'\" et
+.TH KILLPG "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
+killpg
+\(em send a signal to a process group
+.SH SYNOPSIS
+.LP
+.nf
+#include <signal.h>
+.P
+int killpg(pid_t \fIpgrp\fP, int \fIsig\fP);
+.fi
+.SH DESCRIPTION
+The
+\fIkillpg\fR()
+function shall send the signal specified by
+.IR sig
+to the process group specified by
+.IR pgrp .
+.P
+If
+.IR pgrp
+is greater than 1, \fIkillpg\fP(\fIpgrp\fP,\ \fIsig\fR) shall be
+equivalent to \fIkill\fP(\-\fIpgrp\fP,\ \fIsig\fR). If
+.IR pgrp
+is less than or equal to 1, the behavior of
+\fIkillpg\fR()
+is undefined.
+.SH "RETURN VALUE"
+Refer to
+.IR "\fIkill\fR\^(\|)".
+.SH ERRORS
+Refer to
+.IR "\fIkill\fR\^(\|)".
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+.SS "Sending a Signal to All Other Members of a Process Group"
+.P
+The following example shows how the calling process could send a signal
+to all other members of its process group. To prevent itself from
+receiving the signal it first makes itself immune to the signal by
+ignoring it.
+.sp
+.RS 4
+.nf
+
+#include <signal.h>
+#include <unistd.h>
+\&...
+    if (signal(SIGUSR1, SIG_IGN) == SIG_ERR)
+        /* Handle error */;
+.P
+    if (killpg(getpgrp(), SIGUSR1) == -1)
+        /* Handle error */;"
+.fi
+.P
+.RE
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+None.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIgetpgid\fR\^(\|)",
+.IR "\fIgetpid\fR\^(\|)",
+.IR "\fIkill\fR\^(\|)",
+.IR "\fIraise\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<signal.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 .