mirror of
git://sourceware.org/git/newlib-cygwin.git
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72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
/*************************************************************************\
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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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/* Listing 57-7 */
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/* ud_ucase_cl.c
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A UNIX domain client that communicates with the server in ud_ucase_sv.c.
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This client sends each command-line argument as a datagram to the server,
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and then displays the contents of the server's response datagram.
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*/
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#include "ud_ucase.h"
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int
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main(int argc, char *argv[])
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{
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struct sockaddr_un svaddr, claddr;
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int sfd, j;
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size_t msgLen;
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ssize_t numBytes;
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char resp[BUF_SIZE];
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if (argc < 2 || strcmp(argv[1], "--help") == 0)
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usageErr("%s msg...\n", argv[0]);
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/* Create client socket; bind to unique pathname (based on PID) */
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sfd = socket(AF_UNIX, SOCK_DGRAM, 0);
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if (sfd == -1)
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errExit("socket");
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memset(&claddr, 0, sizeof(struct sockaddr_un));
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claddr.sun_family = AF_UNIX;
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snprintf(claddr.sun_path, sizeof(claddr.sun_path),
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"/tmp/ud_ucase_cl.%ld", (long) getpid());
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if (bind(sfd, (struct sockaddr *) &claddr, sizeof(struct sockaddr_un)) == -1)
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errExit("bind");
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/* Construct address of server */
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memset(&svaddr, 0, sizeof(struct sockaddr_un));
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svaddr.sun_family = AF_UNIX;
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strncpy(svaddr.sun_path, SV_SOCK_PATH, sizeof(svaddr.sun_path) - 1);
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/* Send messages to server; echo responses on stdout */
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for (j = 1; j < argc; j++) {
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msgLen = strlen(argv[j]); /* May be longer than BUF_SIZE */
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if (sendto(sfd, argv[j], msgLen, 0, (struct sockaddr *) &svaddr,
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sizeof(struct sockaddr_un)) != msgLen)
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fatal("sendto");
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numBytes = recvfrom(sfd, resp, BUF_SIZE, 0, NULL, NULL);
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/* Or equivalently: numBytes = recv(sfd, resp, BUF_SIZE, 0);
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or: numBytes = read(sfd, resp, BUF_SIZE); */
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if (numBytes == -1)
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errExit("recvfrom");
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printf("Response %d: %.*s\n", j, (int) numBytes, resp);
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}
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remove(claddr.sun_path); /* Remove client socket pathname */
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exit(EXIT_SUCCESS);
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}
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