1 files changed, 49 insertions, 0 deletions
diff --git a/user/progY.c b/user/progY.c
new file mode 100644
index 0000000..194f188
--- /dev/null
+++ b/user/progY.c
@@ -0,0 +1,49 @@
+#include <common.h>
+
+/**
+** User function Y:	 exit, sleep, write, getpid
+**
+** Reports its PID, then iterates N times printing 'Yx' and
+** sleeping for one second, then exits.
+**
+** Invoked as:	userY  x  [ n ]
+**	 where x is the ID character
+**		   n is the iteration count (defaults to 10)
+*/
+
+USERMAIN( main ) {
+	int count = 10;	  // default iteration count
+	char ch = 'y';	  // default character to print
+	char buf[128];
+
+	// process the command-line arguments
+	switch( argc ) {
+	case 3:	count = str2int( argv[2], 10 );
+			// FALL THROUGH
+	case 2:	ch = argv[1][0];
+			break;
+	default:
+			sprint( buf, "?: 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" );
+	}
+
+	// report our presence
+	int pid = getpid();
+	sprint( buf, " %c[%d]", ch, pid );
+	swrites( buf );
+
+	for( int i = 0; i < count ; ++i ) {
+		swrites( buf );
+		DELAY(STD);
+		sleep( SEC_TO_MS(1) );
+	}
+
+	exit( 0 );
+
+	return( 42 );  // shut the compiler up!
+}