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Everywhere: Replace some uses of fork/exec with posix_spawn

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It's less code, and it's potentially more efficient once
posix_spawn is a real syscall.
This commit is contained in:
Nico Weber 2020-06-28 13:40:10 -04:00 • committed by Andreas Kling
parent 301ac3c7e5
commit 12cbc4ad0d
11 changed files with 65 additions and 101 deletions
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15
Services/LaunchServer/Launcher.cpp
View file

@ -29,6 +29,7 @@
#include <AK/LexicalPath.h>
#include <LibCore/ConfigFile.h>
#include <LibCore/DirIterator.h>
#include <spawn.h>
#include <stdio.h>
#include <sys/stat.h>
@ -125,18 +126,12 @@ bool Launcher::open_with_handler_name(const URL& url, const String& handler_name
bool spawn(String executable, String argument)
{
pid_t child_pid = fork();
if (child_pid < 0) {
perror("fork");
pid_t child_pid;
const char* argv[] = { executable.characters(), argument.characters(), nullptr };
if ((errno = posix_spawn(&child_pid, executable.characters(), nullptr, nullptr, const_cast<char**>(argv), environ))) {
perror("posix_spawn");
return false;
}
if (child_pid == 0) {
if (execl(executable.characters(), executable.characters(), argument.characters(), nullptr) < 0) {
perror("execl");
return false;
}
ASSERT_NOT_REACHED();
}
return true;
}

25
Services/SystemMenu/main.cpp
View file

@ -36,6 +36,7 @@
#include <LibGUI/Menu.h>
#include <LibGUI/WindowServerConnection.h>
#include <LibGfx/Bitmap.h>
#include <spawn.h>
//#define SYSTEM_MENU_DEBUG
@ -149,12 +150,11 @@ NonnullRefPtr<GUI::Menu> build_system_menu()
auto parent_menu = g_app_category_menus.get(app.category).value_or(*system_menu);
parent_menu->add_action(GUI::Action::create(app.name, icon.ptr(), [app_identifier](auto&) {
dbg() << "Activated app with ID " << app_identifier;
if (fork() == 0) {
const auto& bin = g_apps[app_identifier].executable;
if (execl(bin.characters(), bin.characters(), nullptr) < 0)
perror("execl");
ASSERT_NOT_REACHED();
}
const auto& bin = g_apps[app_identifier].executable;
pid_t child_pid;
const char* argv[] = { bin.characters(), nullptr };
if ((errno = posix_spawn(&child_pid, bin.characters(), nullptr, nullptr, const_cast<char**>(argv), environ)))
perror("posix_spawn");
}));
++app_identifier;
}
@ -197,10 +197,9 @@ NonnullRefPtr<GUI::Menu> build_system_menu()
system_menu->add_separator();
system_menu->add_action(GUI::Action::create("About...", Gfx::Bitmap::load_from_file("/res/icons/16x16/ladybug.png"), [](auto&) {
if (fork() == 0) {
execl("/bin/About", "/bin/About", nullptr);
ASSERT_NOT_REACHED();
}
pid_t child_pid;
const char* argv[] = { "/bin/About", nullptr };
posix_spawn(&child_pid, "/bin/About", nullptr, nullptr, const_cast<char**>(argv), environ);
}));
system_menu->add_separator();
system_menu->add_action(GUI::Action::create("Exit...", [](auto&) {
@ -209,10 +208,8 @@ NonnullRefPtr<GUI::Menu> build_system_menu()
if (command.size() == 0)
return;
if (fork() == 0) {
execv(command[0], const_cast<char* const*>(command.data()));
ASSERT_NOT_REACHED();
}
pid_t child_pid;
posix_spawn(&child_pid, command[0], nullptr, nullptr, const_cast<char**>(command.data()), environ);
}));
return system_menu;