83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
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/*
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* spawn.c - Lua configuration management
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*
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* Copyright © 2009 Julien Danjou <julien@danjou.info>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "structs.h"
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#include "spawn.h"
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#include "luaa.h"
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/** Spawn a program.
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* This function is multi-head (Zaphod) aware and will set display to
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* the right screen according to mouse position.
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* \param L The Lua VM state.
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* \return The number of elements pushed on stack
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* \luastack
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* \lparam The command to launch.
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* \lparam The optional screen number to spawn the command on.
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*/
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int
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luaA_spawn(lua_State *L)
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{
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char *host, newdisplay[128];
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const char *cmd;
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int screen = 0, screenp, displayp;
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if(lua_gettop(L) == 2)
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{
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screen = luaL_checknumber(L, 2) - 1;
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luaA_checkscreen(screen);
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}
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cmd = luaL_checkstring(L, 1);
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if(!globalconf.xinerama_is_active)
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{
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xcb_parse_display(NULL, &host, &displayp, &screenp);
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snprintf(newdisplay, sizeof(newdisplay), "%s:%d.%d", host, displayp, screen);
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setenv("DISPLAY", newdisplay, 1);
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p_delete(&host);
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}
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/* The double-fork construct avoids zombie processes and keeps the code
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* clean from stupid signal handlers. */
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if(fork() == 0)
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{
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if(fork() == 0)
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{
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if(globalconf.connection)
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xcb_disconnect(globalconf.connection);
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setsid();
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a_exec(cmd);
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warn("execl '%s' failed: %s\n", cmd, strerror(errno));
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}
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exit(EXIT_SUCCESS);
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}
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wait(0);
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return 0;
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}
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// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
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