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watch: Avoid overflow for large interval values

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Previously `usleep()` was being used, which was being passed a 32-bit
signed integer as a parameter. This caused an overflow for intervals
larger than 2147 seconds.
This commit is contained in:
Tim Ledbetter 2023-05-29 07:22:09 +01:00 committed by Andreas Kling
parent ffc52b35fc
commit 269310268d
Notes: sideshowbarker 2024-07-16 22:58:46 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/269310268d
Pull-request: https://github.com/SerenityOS/serenity/pull/19121
Reviewed-by: https://github.com/gmta ✅
1 changed files with 16 additions and 32 deletions
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48
Userland/Utilities/watch.cpp
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@ -17,7 +17,6 @@
#include <errno.h>
#include <spawn.h>
#include <stdio.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
@ -28,10 +27,12 @@ static bool flag_beep_on_fail = false;
static int volatile exit_code = 0;
static volatile pid_t child_pid = -1;
static DeprecatedString build_header_string(Vector<DeprecatedString> const& command, struct timeval const& interval)
static DeprecatedString build_header_string(Vector<DeprecatedString> const& command, Duration const& interval)
{
StringBuilder builder;
builder.appendff("Every {}.{}s: \x1b[1m", interval.tv_sec, interval.tv_usec / 100000);
auto interval_seconds = interval.to_truncated_seconds();
auto interval_fractional_seconds = (interval.to_truncated_milliseconds() % 1000) / 100;
builder.appendff("Every {}.{}s: \x1b[1m", interval_seconds, interval_fractional_seconds);
builder.join(' ', command);
builder.append("\x1b[0m"sv);
return builder.to_deprecated_string();
@ -46,22 +47,6 @@ static DeprecatedString build_header_string(Vector<DeprecatedString> const& comm
return builder.to_deprecated_string();
}
static struct timeval get_current_time()
{
struct timespec ts;
struct timeval tv;
clock_gettime(CLOCK_MONOTONIC_COARSE, &ts);
timespec_to_timeval(ts, tv);
return tv;
}
static int64_t usecs_from(struct timeval const& start, struct timeval const& end)
{
struct timeval diff;
timeval_sub(end, start, diff);
return 1000000 * diff.tv_sec + diff.tv_usec;
}
static void handle_signal(int signal)
{
if (child_pid > 0) {
@ -188,29 +173,28 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
} else {
TRY(Core::System::pledge("stdio proc exec"));
struct timeval interval;
Duration interval;
if (opt_interval <= 0) {
interval = { 0, 100000 };
interval = Duration::from_milliseconds(100);
} else {
interval = { opt_interval, 0 };
interval = Duration::from_seconds(opt_interval);
}
auto now = get_current_time();
auto now = MonotonicTime::now();
auto next_run_time = now;
header = build_header_string(command, interval);
while (true) {
int usecs_to_sleep = usecs_from(now, next_run_time);
while (usecs_to_sleep > 0) {
usleep(usecs_to_sleep);
now = get_current_time();
usecs_to_sleep = usecs_from(now, next_run_time);
}
auto duration_to_sleep = (next_run_time - now).to_timespec();
timespec remaining_sleep {};
do {
clock_nanosleep(CLOCK_MONOTONIC, 0, &duration_to_sleep, &remaining_sleep);
} while (remaining_sleep.tv_sec || remaining_sleep.tv_nsec);
watch_callback();
now = get_current_time();
timeval_add(next_run_time, interval, next_run_time);
if (usecs_from(now, next_run_time) < 0) {
now = MonotonicTime::now();
next_run_time = next_run_time + interval;
if (next_run_time < now) {
// The next execution is overdue, so we set next_run_time to now to prevent drift.
next_run_time = now;
}