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sleep: Support fractional sleep lengths

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This commit is contained in:
Andreas Kling 2021-01-23 08:53:32 +01:00
parent c5df0532c0
commit fd29bed656
1 changed files with 21 additions and 4 deletions
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25
Userland/Utilities/sleep.cpp
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@ -28,6 +28,7 @@
#include <signal.h> #include <signal.h>
#include <stdio.h> #include <stdio.h>
#include <string.h> #include <string.h>
#include <time.h>
#include <unistd.h> #include <unistd.h>
static volatile bool g_interrupted; static volatile bool g_interrupted;
@ -38,7 +39,7 @@ static void handle_sigint(int)
int main(int argc, char** argv) int main(int argc, char** argv)
{ {
int secs; double secs;
Core::ArgsParser args_parser; Core::ArgsParser args_parser;
args_parser.add_positional_argument(secs, "Number of seconds to sleep for", "num-seconds"); args_parser.add_positional_argument(secs, "Number of seconds to sleep for", "num-seconds");
@ -54,9 +55,25 @@ int main(int argc, char** argv)
return 1; return 1;
} }
unsigned remaining = sleep(secs); double whole_seconds = static_cast<time_t>(secs);
if (remaining) { double fraction = secs - whole_seconds;
printf("Sleep interrupted with %u seconds remaining.\n", remaining);
timespec requested_sleep {
.tv_sec = static_cast<time_t>(whole_seconds),
.tv_nsec = static_cast<long>(fraction * (double)1000000000),
};
timespec remaining_sleep {};
if (clock_nanosleep(CLOCK_MONOTONIC, 0, &requested_sleep, &remaining_sleep) < 0) {
if (errno != EINTR) {
perror("clock_nanosleep");
return 1;
}
}
if (remaining_sleep.tv_sec || remaining_sleep.tv_nsec) {
outln("Sleep interrupted with {}.{} seconds remaining.", remaining_sleep.tv_sec, remaining_sleep.tv_nsec);
} }
signal(SIGINT, SIG_DFL); signal(SIGINT, SIG_DFL);