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support: Add support_create_timer

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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>
This commit is contained in:
Adhemerval Zanella
2021-06-16 13:44:03 -03:00
parent 52a5fe70a2
commit 92f7b46510
3 changed files with 81 additions and 0 deletions
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69
support/support_create_timer.c Normal file
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/* Create a periodic timer.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <support/check.h>
#include <support/support.h>
#include <support/xsignal.h>
#include <time.h>
static void
dummy_alrm_handler (int sig)
{
}
timer_t
support_create_timer (uint64_t sec, long int nsec, bool repeat,
void (*callback)(int))
{
struct sigaction sa;
sa.sa_handler = callback != NULL ? callback : dummy_alrm_handler;
sigemptyset (&sa.sa_mask);
sa.sa_flags = 0;
xsigaction (SIGALRM, &sa, NULL);
struct sigevent ev = {
.sigev_notify = SIGEV_SIGNAL,
.sigev_signo = SIGALRM
};
timer_t timerid;
int r = timer_create (CLOCK_REALTIME, &ev, &timerid);
if (r == -1)
FAIL_EXIT1 ("timer_create: %m");
/* Single timer with 0.1s. */
struct itimerspec its =
{
{ .tv_sec = repeat ? sec : 0, .tv_nsec = repeat ? nsec : 0 },
{ .tv_sec = sec, .tv_nsec = nsec }
};
r = timer_settime (timerid, 0, &its, NULL);
if (r == -1)
FAIL_EXIT1 ("timer_settime: %m");
return timerid;
}
/* Disable the timer TIMER. */
void
support_delete_timer (timer_t timer)
{
int r = timer_delete (timer);
if (r == -1)
FAIL_EXIT1 ("timer_delete: %m");
xsignal (SIGALRM, SIG_DFL);
}