gecko-dev/toolkit/xre/MacLaunchHelper.mm

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "MacLaunchHelper.h"
#include "nsMemory.h"
#include "nsIAppStartup.h"
#include "mozilla/UniquePtr.h"
#include <stdio.h>
#include <spawn.h>
#include <crt_externs.h>
using namespace mozilla;
namespace {
cpu_type_t pref_cpu_types[2] = {
#if defined(__i386__)
CPU_TYPE_X86,
#elif defined(__x86_64__)
CPU_TYPE_X86_64,
#elif defined(__ppc__)
CPU_TYPE_POWERPC,
#endif
CPU_TYPE_ANY };
cpu_type_t cpu_i386_types[2] = {
CPU_TYPE_X86,
CPU_TYPE_ANY };
cpu_type_t cpu_x64_86_types[2] = {
CPU_TYPE_X86_64,
CPU_TYPE_ANY };
} // namespace
void LaunchChildMac(int aArgc, char** aArgv,
uint32_t aRestartType, pid_t *pid)
{
// "posix_spawnp" uses null termination for arguments rather than a count.
// Note that we are not duplicating the argument strings themselves.
auto argv_copy = MakeUnique<char*[]>(aArgc + 1);
for (int i = 0; i < aArgc; i++) {
argv_copy[i] = aArgv[i];
}
argv_copy[aArgc] = NULL;
// Initialize spawn attributes.
posix_spawnattr_t spawnattr;
if (posix_spawnattr_init(&spawnattr) != 0) {
printf("Failed to init posix spawn attribute.");
return;
}
cpu_type_t *wanted_type = pref_cpu_types;
size_t attr_count = ArrayLength(pref_cpu_types);
if (aRestartType & nsIAppStartup::eRestarti386) {
wanted_type = cpu_i386_types;
attr_count = ArrayLength(cpu_i386_types);
} else if (aRestartType & nsIAppStartup::eRestartx86_64) {
wanted_type = cpu_x64_86_types;
attr_count = ArrayLength(cpu_x64_86_types);
}
// Set spawn attributes.
size_t attr_ocount = 0;
if (posix_spawnattr_setbinpref_np(&spawnattr, attr_count, wanted_type, &attr_ocount) != 0 ||
attr_ocount != attr_count) {
printf("Failed to set binary preference on posix spawn attribute.");
posix_spawnattr_destroy(&spawnattr);
return;
}
// Pass along our environment.
char** envp = NULL;
char*** cocoaEnvironment = _NSGetEnviron();
if (cocoaEnvironment) {
envp = *cocoaEnvironment;
}
int result = posix_spawnp(pid, argv_copy[0], NULL, &spawnattr, argv_copy.get(), envp);
posix_spawnattr_destroy(&spawnattr);
if (result != 0) {
printf("Process spawn failed with code %d!", result);
}
}