prosody
b828d7d47973
util-src/pposix.c

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util-src/pposix.c @ 586:b828d7d47973

Add posix support library, and adjust makefiles for it
author Matthew Wild <mwild1@gmail.com>
date Sat, 06 Dec 2008 23:20:59 +0000
child 588:e743cb742ca6
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1 /* Prosody IM v0.1
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2 -- Copyright (C) 2008 Matthew Wild
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3 -- Copyright (C) 2008 Waqas Hussain
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4 --
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5 -- This program is free software; you can redistribute it and/or
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6 -- modify it under the terms of the GNU General Public License
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7 -- as published by the Free Software Foundation; either version 2
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8 -- of the License, or (at your option) any later version.
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9 --
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10 -- This program is distributed in the hope that it will be useful,
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11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 -- GNU General Public License for more details.
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14 --
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15 -- You should have received a copy of the GNU General Public License
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16 -- along with this program; if not, write to the Free Software
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17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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18 */
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19
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20 /* pposix.c
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21 POSIX support functions for Lua
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22 */
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23
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24 #include <stdlib.h>
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25 #include <unistd.h>
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26 #include <libgen.h>
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27 #include <sys/types.h>
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28 #include <sys/stat.h>
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29 #include <fcntl.h>
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30
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31 #include "lua.h"
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32
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33 static int daemonize(lua_State *L)
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34 {
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35
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36 pid_t pid;
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37
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38 if ( getppid() == 1 )
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39 {
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40 lua_pushboolean(L, 0);
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41 lua_pushstring(L, "already-daemonized");
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42 return 2;
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43 }
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44
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45 /* Attempt initial fork */
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46 if((pid = fork()) < 0)
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47 {
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48 /* Forking failed */
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49 lua_pushboolean(L, 0);
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50 lua_pushstring(L, "fork-failed");
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51 return 2;
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52 }
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53 else if(pid != 0)
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54 {
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55 /* We are the parent process */
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56 printf("We are the parent, pid of child is %d\n", (int)pid);
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57 lua_pushboolean(L, 1);
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58 lua_pushnumber(L, pid);
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59 return 2;
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60 }
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61
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62 printf("We are the child, pid reports %d\n", (int)pid);
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63 /* and we are the child process */
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64 if(setsid() == -1)
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65 {
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66 /* We failed to become session leader */
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67 /* (we probably already were) */
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68 lua_pushboolean(L, 0);
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69 lua_pushstring(L, "setsid-failed");
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70 return 2;
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71 }
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72
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73 /* Close stdin, stdout, stderr */
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74 /* close(0);
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75 close(1);
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76 close(2);
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77 */
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78 /* Final fork, use it wisely */
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79 if(fork())
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80 exit(0);
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81
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82 /* Show's over, let's continue */
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83 lua_pushboolean(L, 1);
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84 lua_pushnil(L);
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85 return 2;
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86 }
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87
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88 int luaopen_util_pposix(lua_State *L)
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89 {
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90 lua_newtable(L);
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91 lua_pushcfunction(L, daemonize);
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92 lua_setfield(L, -2, "daemonize");
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93 return 1;
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94 };