From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 sys/etc/prupdate.x | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 sys/etc/prupdate.x

(limited to 'sys/etc/prupdate.x')

diff --git a/sys/etc/prupdate.x b/sys/etc/prupdate.x
new file mode 100644
index 00000000..49aa7e56
--- /dev/null
+++ b/sys/etc/prupdate.x
@@ -0,0 +1,61 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<error.h>
+include	<config.h>
+include	<prstat.h>
+
+# PRUPDATE -- Broadcast a message to a process, or if pid=0, to all connected
+# subprocesses.  Used primarily to incrementally pass SET and CHDIR commands to
+# subprocesses, eliminating the need to reconnect each process.  Note that the
+# child process does not return "bye" in response to one of the builtin
+# functions SET and CHDIR.  NOTE: if a child process is marked "busy" the
+# message is not sent to that process; only idle processes receive the message.
+
+procedure prupdate (pid, message, flushout)
+
+int	pid			#I process to be updated, or 0 for all procs
+char	message[ARB]		#I message to be broadcast to each child
+int	flushout		#I flush output
+
+int	pr, status
+pointer	sp, cmd, op
+int	gstrcpy(), prstati()
+include	"prc.com"
+
+begin
+	call smark (sp)
+	call salloc (cmd, SZ_COMMAND, TY_CHAR)
+
+	# Make sure that the message string is non-null and is newline
+	# delimited.
+
+	op = cmd + gstrcpy (message, Memc[cmd], SZ_COMMAND)
+	if (op == cmd) {
+	    call sfree (sp)
+	    return
+	} else if (Memc[op-1] != '\n') {
+	    Memc[op] = '\n'
+	    Memc[op+1] = EOS
+	}
+
+	# Broadcast the message.  If the child fails to process the command
+	# and returns the ERROR statement, the error will not be detected until
+	# the next user command is sent to the process (and indeed may corrupt
+	# the protocol).  The parent should execute the SET or CHDIR prior
+	# to sending it to the child to make sure it is valid.
+
+	for (pr=1;  pr <= MAX_CHILDPROCS;  pr=pr+1)
+	    if ((pid != NULL && pr_pid[pr] == pid) ||
+		(pid == NULL && pr_pid[pr] != NULL)) {
+
+		status = prstati (pr_pid[pr], PR_STATUS)
+		if (status == P_RUNNING) {
+		    iferr (call putline (pr_outfd[pr], Memc[cmd]))
+			call erract (EA_WARN)
+		    else if (flushout == YES)
+			call flush (pr_outfd[pr])
+		}
+	    }
+
+	call sfree (sp)
+end
-- 
cgit