initial checkout from wrc

1 files changed, 48 insertions, 0 deletions

diff --git a/user/progX.c b/user/progX.c
new file mode 100644
index 0000000..ed356b9
--- /dev/null
+++ b/user/progX.c
@@ -0,0 +1,48 @@
+#include <common.h>
+
+/**
+** User function X:   exit, write, getpid
+**
+** Prints its PID at start and exit, iterates printing its character
+** N times, and exits with a status of 12.
+**
+** Invoked as:  userX  x  n
+**	 where x is the ID character
+**		   n is the iteration count
+*/
+
+USERMAIN( main ) {
+	int count = 20;	  // iteration count
+	char ch = 'x';	  // 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, "userX: 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" );
+	}
+
+	// announce our presence
+	int pid = getpid();
+	sprint( buf, " %c[%d]", ch, pid );
+	swrites( buf );
+
+	for( int i = 0; i < count ; ++i ) {
+		swrites( buf );
+		DELAY(STD);
+	}
+
+	exit( 12 );
+
+	return( 42 );  // shut the compiler up!
+}