initial checkout from wrc

1 files changed, 57 insertions, 0 deletions

diff --git a/user/progW.c b/user/progW.c
new file mode 100644
index 0000000..5903663
--- /dev/null
+++ b/user/progW.c
@@ -0,0 +1,57 @@
+#include <common.h>
+
+/**
+** User function W:   exit, sleep, write, getpid, gettime
+**
+** Reports its presence, then iterates 'n' times printing identifying
+** information and sleeping, before exiting.
+**
+** Invoked as:  userW  x  [ n  [ s ] ]
+**	 where x is the ID character
+**		   n is the iteration count (defaults to 20)
+**		   s is the sleep time (defaults to 3 seconds)
+*/
+
+USERMAIN( main ) {
+	int count = 20;	  // default iteration count
+	char ch = 'w';	  // default character to print
+	int nap = 3;	  // nap length
+	char buf[128];
+
+	// process the command-line arguments
+	switch( argc ) {
+	case 4:	nap = str2int( argv[3], 10 );
+			// FALL THROUGH
+	case 3:	count = str2int( argv[2], 10 );
+			// FALL THROUGH
+	case 2:	ch = argv[1][0];
+			break;
+	default:
+			sprint( buf, "userW: 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();
+	uint32_t now = gettime();
+	sprint( buf, " %c[%d,%u]", ch, pid, now );
+	swrites( buf );
+
+	write( CHAN_SIO, &ch, 1 );
+
+	for( int i = 0; i < count ; ++i ) {
+		now = gettime();
+		sprint( buf, " %c[%d,%u] ", ch, pid, now );
+		swrites( buf );
+		sleep( SEC_TO_MS(nap) );
+	}
+
+	exit( 0 );
+
+	return( 42 );  // shut the compiler up!
+}