glib/gio/gio-launch-desktop.c
Daniel Drake 742efe6232 gdesktopappinfo: enable fast posix_spawn gspawn codepath
In order to use the new posix_spawn gspawn codepath, for more robust
app launching when available memory is low, we need to meet some
conditions.

child_setup needs to be NULL for this optimization to work, so drop
the internal child_setup that is used here. Replace it with a lightweight
wrapper binary (gio-launch-desktop) that sets GIO_LAUNCHED_DESKTOP_FILE_PID
before executing the app.

Adjust PATH for gio tests so that it can execute the new binary from the
build directory.
2018-06-21 11:44:28 -05:00

53 lines
1.5 KiB
C

/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2018 Endless Mobile, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* Author: Daniel Drake <drake@endlessm.com>
*/
/*
* gio-launch-desktop: GDesktopAppInfo helper
* Executable wrapper to set GIO_LAUNCHED_DESKTOP_FILE_PID
* There are complications when doing this in a fork()/exec() codepath,
* and it cannot otherwise be done with posix_spawn().
* This wrapper is designed to be minimal and lightweight.
* It does not even link against glib.
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
int
main (int argc, char *argv[])
{
pid_t pid = getpid ();
char buf[50];
int r;
if (argc < 2)
return -1;
r = snprintf (buf, sizeof (buf), "GIO_LAUNCHED_DESKTOP_FILE_PID=%ld", (long) pid);
if (r >= sizeof (buf))
return -1;
putenv (buf);
return execvp (argv[1], argv + 1);
}