Editing Mer/Documentation/N810 GPS

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{{Mer}}
 
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== Notes ==
== Notes ==
*These directions are confirmed to work on Mer 0.12.
*These directions are confirmed to work on Mer 0.12.
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=== Step 6: Install libgps5300faker.so ===
=== Step 6: Install libgps5300faker.so ===
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First of all, install the necessary packages (they may be removed later, this may be an excessive list or an incomplete list. Basically keep installing stuff until it stops complaining):
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Put libgps5300faker.so in /usr/lib (Not posted anywhere yet):
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apt-get install build-essential m4 automake autoconf
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  cp /path/to/libgps5300faker.so /usr/lib
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Make the following files somewhere (they may be removed later):
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preload_init.c
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/*
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  * Copyright 2009 Luke Dashjr <luke_n8x0_gps5300driver@dashjr.org>
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  * Licensed for redistribution as-is;
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  * contact me if you want something more permissive
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  */
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#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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static struct sockaddr_un ctrl_sau = {
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AF_UNIX,
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"/var/lib/gps/gps_driver_ctrl\0",
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};
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#define CTRL_SCK_PATH ctrl_sau.sun_path
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static int ctrl_sck = -1;
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typedef int (*bind_t)(int, const struct sockaddr*, socklen_t);
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int
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bind(int sockfd, const struct sockaddr*addr, socklen_t addrlen) {
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static bind_t real = NULL;
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if (!real)
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real = dlsym(RTLD_NEXT, "bind");
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int rv = real(sockfd, addr, addrlen);
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if (
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    addr &&
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    addr->sa_family == AF_FILE &&
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    !strcmp(CTRL_SCK_PATH,
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            ((struct sockaddr_un*)addr)->sun_path
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          ) &&
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    getenv("GPS5300_SELFINIT") &&
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    1
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)
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ctrl_sck = sockfd;
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return rv;
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}
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typedef int (*listen_t)(int, int);
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int
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listen(int sockfd, int backlog) {
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static listen_t real = NULL;
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if (!real)
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real = dlsym(RTLD_NEXT, "listen");
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int rv = real(sockfd, backlog);
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if (sockfd == ctrl_sck && !fork())
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{
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// Child process :)
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int sck;
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char initcmd[] = "P 3\n";
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sck = socket(PF_FILE, SOCK_STREAM, 0);
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if (sck < 0)
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exit(1);
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if (connect(sck, &ctrl_sau, sizeof ctrl_sau))
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exit(1);
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write(sck, initcmd, sizeof initcmd);
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close(sck);
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exit(0);
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}
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return rv;
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}
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preload.c:
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  /*
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  * Copyright 2009 Luke Dashjr <luke_n8x0_gps5300driver@dashjr.org>
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  * Licensed for redistribution as-is;
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  * contact me if you want something more permissive
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  */
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#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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typedef struct passwd* (*getpwnam_t)(const char*);
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struct passwd *
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getpwnam(const char *name) {
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static getpwnam_t real = NULL;
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if (!real)
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real = dlsym(RTLD_NEXT, "getpwnam");
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if (!strcmp(name, "user"))
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{
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const char*username = getenv("GPS5300_USER");
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if (username)
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name = username;
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}
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return real(name);
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}
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Compile them:
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cd /path/to/source/files/
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gcc -shared -fPIC -ldl preload.c preload_init.c -o libgps5300faker.so
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Put libgps5300faker.so in /usr/lib (assuming you're still in the same directory):
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  cp libgps5300faker.so /usr/lib
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=== Step 7: Reboot ===
=== Step 7: Reboot ===
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You have a lock and are ready to use your GPS (I've also gotten other messages indicating the GPS is ready. Basically anything new/other than what it routinely spits out should be a good indicator).
You have a lock and are ready to use your GPS (I've also gotten other messages indicating the GPS is ready. Basically anything new/other than what it routinely spits out should be a good indicator).
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[[Category:N8x0]]
 
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[[Category:GPS]]
 

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