From 6af21e6a4f2251e71353562d5df7f376fdffc270 Mon Sep 17 00:00:00 2001
From: Freya Murphy <freya@freyacat.org>
Date: Tue, 25 Mar 2025 17:36:52 -0400
Subject: initial checkout from wrc

---
 user/progMN.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 user/progMN.c

(limited to 'user/progMN.c')

diff --git a/user/progMN.c b/user/progMN.c
new file mode 100644
index 0000000..38ccd31
--- /dev/null
+++ b/user/progMN.c
@@ -0,0 +1,72 @@
+#include <common.h>
+
+/**
+** User function main #5:  exit, fork, exec, write
+**
+** Iterates spawning copies of userW (and possibly userZ), reporting
+** their PIDs as it goes.
+**
+** Invoked as:  main5  x  n  b
+**	 where x is the ID character
+**		   n is the iteration count
+**		   b is the w&z boolean
+*/
+
+USERMAIN( main ) {
+	int count = 5;	// default iteration count
+	char ch = '5';	// default character to print
+	int alsoZ = 0;	// also do userZ?
+	char msgw[] = "*5w*";
+	char msgz[] = "*5z*";
+	char buf[128];
+
+	// process the command-line arguments
+	switch( argc ) {
+	case 4:	alsoZ = argv[3][0] == 't';
+			// FALL THROUGH
+	case 3:	count = str2int( argv[2], 10 );
+			// FALL THROUGH
+	case 2:	ch = argv[1][0];
+			break;
+	default:
+			sprint( buf, "main5: argc %d, args: ", argc );
+			cwrites( buf );
+			for( int i = 0; i <= argc; ++i ) {
+				sprint( buf, " %s", argv[argc] ? argv[argc] : "(null)" );
+				cwrites( buf );
+			}
+			cwrites( "\n" );
+	}
+
+	// update the extra message strings
+	msgw[1] = msgz[1] = ch;
+
+	// announce our presence
+	write( CHAN_SIO, &ch, 1 );
+
+	// set up the argument vector(s)
+
+	// W:  15 iterations, 5-second sleep
+	char *argsw[] = { "userW", "W", "15", "5", NULL };
+
+	// Z:  15 iterations
+	char *argsz[] = { "userZ", "Z", "15", NULL };
+
+	for( int i = 0; i < count; ++i ) {
+		write( CHAN_SIO, &ch, 1 );
+		int whom = spawn( ProgW, argsw	);
+		if( whom < 1 ) {
+			swrites( msgw );
+		}
+		if( alsoZ ) {
+			whom = spawn( ProgZ, argsz );
+			if( whom < 1 ) {
+				swrites( msgz );
+			}
+		}
+	}
+
+	exit( 0 );
+
+	return( 42 );  // shut the compiler up!
+}
-- 
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