1 files changed, 113 insertions, 0 deletions
diff --git a/tutorials/sndkit/tests/seltest2.c b/tutorials/sndkit/tests/seltest2.c
new file mode 100644
index 0000000..d4e3ab8
--- /dev/null
+++ b/tutorials/sndkit/tests/seltest2.c
@@ -0,0 +1,113 @@
+/*
+  Purpose: This program has been used to verify that the select() call works
+ * Copyright (C) 4Front Technologies, 2002-2004. Released under GPLv2/CDDL.
+ *
+ * Description:
+ * This program opens an audio device and then just
+ * copies input to output. Select is used for flow control.
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <soundcard.h>
+#ifdef _AIX
+#include <sys/select.h>
+#endif
+
+int
+main (int agrc, char *argv[])
+{
+  int fd;
+
+  int tmp;
+
+  char buf[128 * 1024];
+
+  int have_data = 0;
+  int n, l;
+
+  int frag = 0x00200008;	/* 32 fragments of 2^8=256 bytes */
+
+  fd_set reads, writes;
+
+  close (0);
+
+  if ((fd = open ("/dev/dsp", O_RDWR, 0)) == -1)
+    {
+      perror ("/dev/dsp open");
+      exit (-1);
+    }
+
+  ioctl (fd, SNDCTL_DSP_SETFRAGMENT, &frag);
+
+/*
+ * Set just the sampling tahe. Use the default format. We do not do any
+ * error checking (maybe not so good idea) because we don't care what
+ * the sampling rate really is.
+ */
+  tmp = 48000;
+  ioctl (fd, SNDCTL_DSP_SPEED, &tmp);
+
+  while (1)
+    {
+      struct timeval time;
+
+      FD_ZERO (&reads);
+      FD_ZERO (&writes);
+
+      if (have_data)
+	FD_SET (fd, &writes);
+      else
+	FD_SET (fd, &reads);
+
+      time.tv_sec = 1;
+      time.tv_usec = 0;
+      if (select (fd + 1, &reads, &writes, NULL, &time) == -1)
+	{
+	  perror ("select");
+	  exit (-1);
+	}
+
+      if (FD_ISSET (fd, &reads))
+	{
+	  struct audio_buf_info info;
+
+	  if (ioctl (fd, SNDCTL_DSP_GETISPACE, &info) == -1)
+	    {
+	      perror ("select");
+	      exit (-1);
+	    }
+
+	  n = info.bytes;
+
+	  l = read (fd, buf, n);
+	  if (l > 0)
+	    have_data = 1;
+	}
+
+      if (FD_ISSET (fd, &writes))
+	{
+	  int i;
+
+	  struct audio_buf_info info;
+
+	  if (ioctl (fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
+	    {
+	      perror ("select");
+	      exit (-1);
+	    }
+
+	  n = info.bytes;
+
+	  printf ("Write %d\n", l);
+	  write (fd, buf, l);
+	  printf ("OK");
+	  have_data = 0;
+	}
+    }
+
+  exit (0);
+}