alarm_timeout.c (1441B)
1 /* ISC license. */ 2 3 #include <skalibs/sysdeps.h> 4 #include <skalibs/tai.h> 5 #include <skalibs/alarm.h> 6 7 #ifdef SKALIBS_HASTIMER 8 9 #include <errno.h> 10 #include <signal.h> 11 #include <time.h> 12 #include "alarm-internal.h" 13 14 #undef MYCLOCK 15 #ifdef SKALIBS_HASCLOCKMON 16 # define MYCLOCK CLOCK_MONOTONIC 17 #else 18 # define MYCLOCK CLOCK_REALTIME 19 #endif 20 21 int alarm_timeout (tain const *tto) 22 { 23 struct itimerspec it = { .it_interval = { .tv_sec = 0, .tv_nsec = 0 } } ; 24 struct sigevent se = { .sigev_notify = SIGEV_SIGNAL, .sigev_signo = SIGALRM, .sigev_value = { .sival_int = 0 }, .sigev_notify_function = 0, .sigev_notify_attributes = 0 } ; 25 if (!timespec_from_tain_relative(&it.it_value, tto)) return 0 ; 26 if (timer_create(MYCLOCK, &se, &timer_here) < 0) return 0 ; 27 if (timer_settime(timer_here, 0, &it, 0) < 0) 28 { 29 int e = errno ; 30 timer_delete(timer_here) ; 31 errno = e ; 32 return 0 ; 33 } 34 return 1 ; 35 } 36 37 #else 38 #ifdef SKALIBS_HASITIMER 39 40 #include <sys/time.h> 41 42 int alarm_timeout (tain const *tto) 43 { 44 struct itimerval it = { .it_interval = { .tv_sec = 0, .tv_usec = 0 } } ; 45 if (!timeval_from_tain_relative(&it.it_value, tto)) return 0 ; 46 if (setitimer(ITIMER_REAL, &it, 0) < 0) return 0 ; 47 return 1 ; 48 } 49 50 #else 51 52 #include <unistd.h> 53 #include <limits.h> 54 55 int alarm_timeout (tain const *tto) 56 { 57 int t = tain_to_millisecs(tto) ; 58 if (t < 0 || t > INT_MAX - 999) return 0 ; 59 t = (t + 999) / 1000 ; 60 alarm(t) ; 61 return 1 ; 62 } 63 64 #endif 65 #endif