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annotate libutil/sockinit.c @ 1:b161dbfffdaa

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include, libutil: port from old ThemWi
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 08 Jun 2024 23:06:53 +0000
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b161dbfffdaa include, libutil: port from old ThemWi
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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Mychaela Falconia <falcon@freecalypso.org>
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2 * This library module implements a function that helps initialize
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Mychaela Falconia <falcon@freecalypso.org>
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3 * sockaddr for bind or connect operations on UNIX domain sockets.
b161dbfffdaa include, libutil: port from old ThemWi
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4 *
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Mychaela Falconia <falcon@freecalypso.org>
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5 * Back when I programmed under 4.3BSD UNIX, this operation was simple
b161dbfffdaa include, libutil: port from old ThemWi
Mychaela Falconia <falcon@freecalypso.org>
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6 * and straightforward - but under "modern" Unixes, it appears to be
b161dbfffdaa include, libutil: port from old ThemWi
Mychaela Falconia <falcon@freecalypso.org>
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7 * a complex affair, given the messy code (originally copied from
b161dbfffdaa include, libutil: port from old ThemWi
Mychaela Falconia <falcon@freecalypso.org>
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8 * Osmocom) that appears in FreeCalypso host tools for the rvinterf
b161dbfffdaa include, libutil: port from old ThemWi
Mychaela Falconia <falcon@freecalypso.org>
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9 * local socket interface. Hence I am factoring that mess out into
b161dbfffdaa include, libutil: port from old ThemWi
Mychaela Falconia <falcon@freecalypso.org>
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10 * its own library function this time around.
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11 */
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12
b161dbfffdaa include, libutil: port from old ThemWi
Mychaela Falconia <falcon@freecalypso.org>
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13 #include <sys/types.h>
b161dbfffdaa include, libutil: port from old ThemWi
Mychaela Falconia <falcon@freecalypso.org>
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14 #include <sys/socket.h>
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Mychaela Falconia <falcon@freecalypso.org>
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15 #include <sys/un.h>
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Mychaela Falconia <falcon@freecalypso.org>
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16 #include <string.h>
b161dbfffdaa include, libutil: port from old ThemWi
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17 #include <strings.h>
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18
b161dbfffdaa include, libutil: port from old ThemWi
Mychaela Falconia <falcon@freecalypso.org>
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19 void
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Mychaela Falconia <falcon@freecalypso.org>
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20 fill_sockaddr_un(pathname, sunp, lenp)
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Mychaela Falconia <falcon@freecalypso.org>
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21 char *pathname;
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22 struct sockaddr_un *sunp;
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23 unsigned *lenp;
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24 {
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25 /* local socket binding voodoo copied from osmocon */
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26 sunp->sun_family = AF_UNIX;
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27 strncpy(sunp->sun_path, pathname, sizeof(sunp->sun_path));
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28 sunp->sun_path[sizeof(sunp->sun_path) - 1] = '\0';
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29 /* we use the same magic that X11 uses in Xtranssock.c for
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Mychaela Falconia <falcon@freecalypso.org>
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30 * calculating the proper length of the sockaddr */
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Mychaela Falconia <falcon@freecalypso.org>
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31 #if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
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32 sunp->sun_len = strlen(sunp->sun_path);
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33 #endif
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34 #if defined(BSD44SOCKETS) || defined(SUN_LEN)
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35 *lenp = SUN_LEN(sunp);
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36 #else
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37 *lenp = strlen(sunp->sun_path) +
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38 offsetof(struct sockaddr_un, sun_path) + 1;
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39 #endif
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40 }