software/obsloete: Add sockbuf_test.c from my local tree
diff --git a/software/obsolete/sockbuf_test.c b/software/obsolete/sockbuf_test.c
new file mode 100644
index 0000000..d143203
--- /dev/null
+++ b/software/obsolete/sockbuf_test.c
@@ -0,0 +1,94 @@
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+static int set_int_opt(int fd, int opt, int val)
+{
+ return setsockopt(fd, SOL_SOCKET, opt, &val, sizeof(val));
+}
+
+static int get_int_opt(int fd, int opt)
+{
+ int ret, rc;
+ socklen_t optlen = sizeof(ret);
+
+ rc = getsockopt(fd, SOL_SOCKET, opt, &ret, &optlen);
+ if (rc < 0)
+ return rc;
+ return ret;
+}
+
+static int set_nonblock(int fd)
+{
+ int flags;
+ flags = fcntl(fd, F_GETFL);
+ if (flags < 0)
+ return flags;
+ flags |= O_NONBLOCK;
+
+ return fcntl(fd, F_SETFL, flags);
+}
+
+static int run_test_socketpair(int tx_buf)
+{
+ int rc, sd[2];
+ uint8_t buf[1024*1024];
+
+ memset(buf, 0, sizeof(buf));
+
+ rc = socketpair(AF_UNIX, SOCK_STREAM, 0, sd);
+ if (rc < 0)
+ return rc;
+
+ /* set the lowest possible transmit socket buffer */
+ set_int_opt(sd[0], SO_SNDBUF, tx_buf);
+ set_nonblock(sd[0]);
+
+ rc = write(sd[0], buf, sizeof(buf));
+ printf("socketpair: tx_buf %7d: written %7d of %ld\n", tx_buf, rc, sizeof(buf));
+
+ close(sd[0]);
+ close(sd[1]);
+ return 0;
+}
+
+static int run_test_pipe(int tx_buf)
+{
+ int rc, sd[2];
+ uint8_t buf[1024*1024];
+
+ memset(buf, 0, sizeof(buf));
+
+ rc = pipe(sd);
+ if (rc < 0)
+ return rc;
+
+ set_nonblock(sd[1]);
+
+ rc = write(sd[1], buf, sizeof(buf));
+ printf("pipe: tx_buf %7d: written %7d of %ld\n", tx_buf, rc, sizeof(buf));
+
+ close(sd[0]);
+ close(sd[1]);
+ return 0;
+}
+
+
+
+
+int main(int argc, char **argv)
+{
+ int i;
+
+ for (i = 0; i < 20; i++) {
+ run_test_socketpair(1<<i);
+ }
+ run_test_pipe(0);
+}