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