1 files changed, 56 insertions, 0 deletions
diff --git a/winsup/cygwin/socket_tests/is_seqnum_v2_cl.c b/winsup/cygwin/socket_tests/is_seqnum_v2_cl.c
new file mode 100644
index 000000000..a6df5d0a3
--- /dev/null
+++ b/winsup/cygwin/socket_tests/is_seqnum_v2_cl.c
@@ -0,0 +1,56 @@
+/*************************************************************************\
+*                  Copyright (C) Michael Kerrisk, 2018.                   *
+*                                                                         *
+* This program is free software. You may use, modify, and redistribute it *
+* under the terms of the GNU General Public License as published by the   *
+* Free Software Foundation, either version 3 or (at your option) any      *
+* later version. This program is distributed without any warranty.  See   *
+* the file COPYING.gpl-v3 for details.                                    *
+\*************************************************************************/
+
+/* Solution for Exercise 59-2:c */
+
+/* is_seqnum_v2_cl.c
+
+   A simple Internet stream socket client. This server obtains a sequence
+   number from the server.
+
+   The program is the same as is_seqnum_cl.c, except that it uses the
+   functions in our inet_sockets.c library to simplify the creation of a
+   socket that connects to the server's socket.
+
+   See also is_seqnum_v2_sv.c.
+*/
+#include "is_seqnum_v2.h"
+
+int
+main(int argc, char *argv[])
+{
+    char *reqLenStr;                    /* Requested length of sequence */
+    char seqNumStr[INT_LEN];            /* Start of granted sequence */
+    int cfd;
+    ssize_t numRead;
+
+    if (argc < 2 || strcmp(argv[1], "--help") == 0)
+        usageErr("%s server-host [sequence-len]\n", argv[0]);
+
+    cfd = inetConnect(argv[1], PORT_NUM_STR, SOCK_STREAM);
+    if (cfd == -1)
+        fatal("inetConnect() failed");
+
+    reqLenStr = (argc > 2) ? argv[2] : "1";
+    if (write(cfd, reqLenStr, strlen(reqLenStr)) !=  strlen(reqLenStr))
+        fatal("Partial/failed write (reqLenStr)");
+    if (write(cfd, "\n", 1) != 1)
+        fatal("Partial/failed write (newline)");
+
+    numRead = readLine(cfd, seqNumStr, INT_LEN);
+    if (numRead == -1)
+        errExit("readLine");
+    if (numRead == 0)
+        fatal("Unexpected EOF from server");
+
+    printf("Sequence number: %s", seqNumStr);   /* Includes '\n' */
+
+    exit(EXIT_SUCCESS);                         /* Closes 'cfd' */
+}