1 files changed, 55 insertions, 0 deletions
diff --git a/usr/klibc/tests/select.c b/usr/klibc/tests/select.c
new file mode 100644
index 0000000..ba08112
--- /dev/null
+++ b/usr/klibc/tests/select.c
@@ -0,0 +1,55 @@
+/*
+ * Simple test of select()
+ */
+
+#include <sys/select.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[])
+{
+	int fdn, fdz, pfd[2], rv;
+	fd_set readset;
+	struct timeval timeout;
+	int err = 0;
+
+	/* We can always read from /dev/zero; open a pipe that is never
+	   ready for a "never readable" file descriptor */
+	fdz = open("/dev/zero", O_RDONLY);
+	pipe(pfd);
+	fdn = pfd[0];
+
+	FD_ZERO(&readset);
+	FD_SET(fdn, &readset);
+
+	timeout.tv_sec = 0;
+	timeout.tv_usec = 100000;
+
+	rv = select(FD_SETSIZE, &readset, NULL, NULL, &timeout);
+
+	if (rv != 0) {
+		fprintf(stderr,
+			"select with timeout failed (rv = %d, errno = %s)\n",
+			rv, strerror(errno));
+		err++;
+	}
+
+	FD_ZERO(&readset);
+	FD_SET(fdn, &readset);
+	FD_SET(fdz, &readset);
+
+	rv = select(FD_SETSIZE, &readset, NULL, NULL, &timeout);
+
+	if (rv != 1 || !FD_ISSET(fdz, &readset) ||
+	    FD_ISSET(fdn, &readset)) {
+		fprintf(stderr,
+			"select with /dev/zero failed (rv = %d, errno = %s)\n",
+			rv, strerror(errno));
+		err++;
+	}
+
+	return err;
+}