1 files changed, 52 insertions, 0 deletions
diff --git a/user/progJ.c b/user/progJ.c
new file mode 100644
index 0000000..6eb4464
--- /dev/null
+++ b/user/progJ.c
@@ -0,0 +1,52 @@
+#include <common.h>
+
+/**
+** User function J:   exit, fork, exec, write
+**
+** Reports, tries to spawn lots of children, then exits
+**
+** Invoked as:  userJ  x  [ n ]
+**	 where x is the ID character
+**		   n is the number of children to spawn (defaults to 2 * N_PROCS)
+*/
+
+USERMAIN( main ) {
+	int count = 2 * N_PROCS;	// number of children to spawn
+	char ch = 'j';				// 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, "userJ: 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 );
+
+	// set up the command-line arguments
+	char *argsy[] = { "userY", "Y", "10", NULL };
+
+	for( int i = 0; i < count ; ++i ) {
+		int whom = spawn( ProgY, argsy );
+		if( whom < 0 ) {
+			write( CHAN_SIO, "!j!", 3 );
+		} else {
+			write( CHAN_SIO, &ch, 1 );
+		}
+	}
+
+	exit( 0 );
+
+	return( 42 );  // shut the compiler up!
+}