diff options
Diffstat (limited to 'src/sleep-until.c')
| -rw-r--r-- | src/sleep-until.c | 41 |
1 files changed, 36 insertions, 5 deletions
diff --git a/src/sleep-until.c b/src/sleep-until.c index 6b21cba..6177e80 100644 --- a/src/sleep-until.c +++ b/src/sleep-until.c @@ -19,7 +19,10 @@ #include <sys/timerfd.h> #include <string.h> #include <stdlib.h> - +#include <stdint.h> +#include <stdio.h> +#include <unistd.h> +#include <errno.h> int main(int argc, char* argv[]) @@ -28,13 +31,14 @@ int main(int argc, char* argv[]) char float_part[10]; struct itimerspec value; struct itimerspec largest_value; - int i; + int i, fd = -1; + uint64_t _expirations; if (argc < 2) return 0; argv0 = argv[0]; - argc--, argv--; + argc--, argv++; memset(&value, 0, sizeof(value)); float_part[9] = '\0'; @@ -65,12 +69,39 @@ int main(int argc, char* argv[]) largest_value = value; else if (value.it_value.tv_sec > largest_value.it_value.tv_sec) largest_value = value; - else if (value.it_value.tv_nsec > largest_value.it_value.tv_nsec) - largest_value = value; + else if (value.it_value.tv_sec == largest_value.it_value.tv_sec) + if (value.it_value.tv_nsec > largest_value.it_value.tv_nsec) + largest_value = value; } + fd = timerfd_create(CLOCK_REALTIME, 0); + if (fd < 0) + goto fail; + if (timerfd_settime(fd, TFD_TIMER_ABSTIME, &largest_value, NULL)) + goto fail; + for (;;) + { + if (clock_gettime(CLOCK_REALTIME, &(value.it_value))) + goto fail; + if (value.it_value.tv_sec > largest_value.it_value.tv_sec) + break; + if (value.it_value.tv_sec == largest_value.it_value.tv_sec) + if (value.it_value.tv_nsec >= largest_value.it_value.tv_nsec) + break; + if (read(fd, &_expirations, 8) < 8) + { + if (errno == EINTR) + continue; + goto fail; + } + } + close(fd); return 0; + fail: + perror(argv0); + if (fd >= 0) close(fd); + return 1; } |