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Utilities/ps: Don't assume the kernel can provide real TTY paths

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Liav A 2022-03-26 09:22:45 +03:00 committed by Andreas Kling
parent 7053d7ece3
commit d7c7e6e496
Notes: sideshowbarker 2024-07-17 16:45:30 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/d7c7e6e496
Pull-request: https://github.com/SerenityOS/serenity/pull/13270
Issue: https://github.com/SerenityOS/serenity/issues/13225
1 changed files with 26 additions and 8 deletions
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34
Userland/Utilities/ps.cpp
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@ -9,12 +9,33 @@
#include <LibCore/ProcessStatisticsReader.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <sys/sysmacros.h>
#include <unistd.h>
static ErrorOr<String> determine_tty_pseudo_name()
{
struct stat tty_stat;
if (fstat(STDIN_FILENO, &tty_stat) < 0) {
int saved_errno = errno;
perror("fstat");
return Error::from_errno(saved_errno);
}
int tty_device_major = major(tty_stat.st_rdev);
int tty_device_minor = minor(tty_stat.st_rdev);
if (tty_device_major == 201) {
return String::formatted("pts:{}", tty_device_minor);
}
if (tty_device_major == 4) {
return String::formatted("tty:{}", tty_device_minor);
}
VERIFY_NOT_REACHED();
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath tty"));
String this_tty = ttyname(STDIN_FILENO);
auto this_pseudo_tty_name = TRY(determine_tty_pseudo_name());
TRY(Core::System::pledge("stdio rpath"));
TRY(Core::System::unveil("/proc/all", "r"));
@ -119,20 +140,17 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
for (auto const& process : processes) {
auto tty = process.tty;
if (!every_process_flag && tty != this_tty)
if (!every_process_flag && tty != this_pseudo_tty_name)
continue;
if (tty.starts_with("/dev/"))
tty = tty.characters() + 5;
else
tty = "n/a";
auto* state = process.threads.is_empty() ? "Zombie" : process.threads.first().state.characters();
Vector<String> row;
TRY(row.try_resize(columns.size()));
if (tty == "")
tty = "n/a";
if (uid_column != -1)
row[uid_column] = process.username;
if (pid_column != -1)