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92f7b46510
It is a simple wrapper over timer_create, timer_settime, and sigaction. It will be used to check for large timeout to trigger an EINTR and to avoid use a large timeout (as for alarm()). Reviewed-by: Lukasz Majewski <lukma@denx.de>
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/* Create a periodic timer.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <support/check.h>
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#include <support/support.h>
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#include <support/xsignal.h>
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#include <time.h>
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static void
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dummy_alrm_handler (int sig)
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{
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}
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timer_t
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support_create_timer (uint64_t sec, long int nsec, bool repeat,
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void (*callback)(int))
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{
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struct sigaction sa;
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sa.sa_handler = callback != NULL ? callback : dummy_alrm_handler;
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sigemptyset (&sa.sa_mask);
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sa.sa_flags = 0;
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xsigaction (SIGALRM, &sa, NULL);
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struct sigevent ev = {
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.sigev_notify = SIGEV_SIGNAL,
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.sigev_signo = SIGALRM
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};
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timer_t timerid;
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int r = timer_create (CLOCK_REALTIME, &ev, &timerid);
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if (r == -1)
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FAIL_EXIT1 ("timer_create: %m");
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/* Single timer with 0.1s. */
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struct itimerspec its =
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{
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{ .tv_sec = repeat ? sec : 0, .tv_nsec = repeat ? nsec : 0 },
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{ .tv_sec = sec, .tv_nsec = nsec }
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};
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r = timer_settime (timerid, 0, &its, NULL);
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if (r == -1)
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FAIL_EXIT1 ("timer_settime: %m");
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return timerid;
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}
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/* Disable the timer TIMER. */
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void
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support_delete_timer (timer_t timer)
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{
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int r = timer_delete (timer);
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if (r == -1)
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FAIL_EXIT1 ("timer_delete: %m");
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xsignal (SIGALRM, SIG_DFL);
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}
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