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62 lines
2.1 KiB
C
62 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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/* Listing 57-8 */
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/* us_abstract_bind.c
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Demonstrate how to bind a UNIX domain socket to a name in the
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Linux-specific abstract namespace.
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This program is Linux-specific.
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The first printing of the book used slightly different code. The code was
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correct, but could have been better (to understand why, see the errata
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for page 1176 of the book). The old code is shown in comments below.
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*/
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#include "af_unix_hdr.h"
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int
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main(int argc, char *argv[])
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{
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int sockfd;
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struct sockaddr_un addr;
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char *str;
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memset(&addr, 0, sizeof(struct sockaddr_un)); /* Clear address structure */
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addr.sun_family = AF_UNIX; /* UNIX domain address */
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/* addr.sun_path[0] has already been set to 0 by memset() */
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str = "xyz"; /* Abstract name is "\0xyz" */
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strncpy(&addr.sun_path[1], str, strlen(str));
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// In early printings of the book, the above two lines were instead:
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//
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// strncpy(&addr.sun_path[1], "xyz", sizeof(addr.sun_path) - 2);
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// /* Abstract name is "xyz" followed by null bytes */
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sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (sockfd == -1)
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errExit("socket");
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if (bind(sockfd, (struct sockaddr *) &addr,
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sizeof(sa_family_t) + strlen(str) + 1) == -1)
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errExit("bind");
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// In early printings of the book, the final part of the bind() call
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// above was instead:
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// sizeof(struct sockaddr_un)) == -1)
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sleep(60);
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exit(EXIT_SUCCESS);
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}
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