initial checkout from wrc

1 files changed, 43 insertions, 0 deletions

diff --git a/user/progQ.c b/user/progQ.c
new file mode 100644
index 0000000..ecfcffc
--- /dev/null
+++ b/user/progQ.c
@@ -0,0 +1,43 @@
+#include <common.h>
+
+/**
+** User function Q:   exit, write, bogus
+**
+** Reports itself, then tries to execute a bogus system call
+**
+** Invoked as:  userQ  x
+**	 where x is the ID character
+*/
+
+USERMAIN( main ) {
+	char ch = 'q';	  // default character to print
+	char buf[128];
+
+	// process the command-line arguments
+	switch( argc ) {
+	case 2:	ch = argv[1][0];
+			break;
+	default:
+			sprint( buf, "userQ: 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
+	write( CHAN_SIO, &ch, 1 );
+
+	// try something weird
+	bogus();
+
+	// should not have come back here!
+	sprint( buf, "!!!!! %c returned from bogus syscall!?!?!\n", ch );
+	cwrites( buf );
+
+	exit( 1 );
+
+	return( 42 );  // shut the compiler up!
+}