mirror of https://github.com/n-hys/bash.git
141 lines
3.2 KiB
C
141 lines
3.2 KiB
C
/* ufuncs - sleep and alarm functions that understand fractional values */
|
|
|
|
/* Copyright (C) 2008,2009-2020 Free Software Foundation, Inc.
|
|
|
|
This file is part of GNU Bash, the Bourne Again SHell.
|
|
|
|
Bash is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Bash 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with Bash. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include "bashtypes.h"
|
|
|
|
#include "posixtime.h"
|
|
|
|
#if defined (HAVE_UNISTD_H)
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
#if !defined (errno)
|
|
extern int errno;
|
|
#endif /* !errno */
|
|
|
|
#if defined (HAVE_SELECT)
|
|
# include "posixselect.h"
|
|
# include "quit.h"
|
|
# include "trap.h"
|
|
# include "stat-time.h"
|
|
#endif
|
|
|
|
/* A version of `alarm' using setitimer if it's available. */
|
|
|
|
#if defined (HAVE_SETITIMER)
|
|
unsigned int
|
|
falarm(secs, usecs)
|
|
unsigned int secs, usecs;
|
|
{
|
|
struct itimerval it, oit;
|
|
|
|
it.it_interval.tv_sec = 0;
|
|
it.it_interval.tv_usec = 0;
|
|
|
|
it.it_value.tv_sec = secs;
|
|
it.it_value.tv_usec = usecs;
|
|
|
|
if (setitimer(ITIMER_REAL, &it, &oit) < 0)
|
|
return (-1); /* XXX will be converted to unsigned */
|
|
|
|
/* Backwards compatibility with alarm(3) */
|
|
if (oit.it_value.tv_usec)
|
|
oit.it_value.tv_sec++;
|
|
return (oit.it_value.tv_sec);
|
|
}
|
|
#else
|
|
int
|
|
falarm (secs, usecs)
|
|
unsigned int secs, usecs;
|
|
{
|
|
if (secs == 0 && usecs == 0)
|
|
return (alarm (0));
|
|
|
|
if (secs == 0 || usecs >= 500000)
|
|
{
|
|
secs++;
|
|
usecs = 0;
|
|
}
|
|
return (alarm (secs));
|
|
}
|
|
#endif /* !HAVE_SETITIMER */
|
|
|
|
/* A version of sleep using fractional seconds and select. I'd like to use
|
|
`usleep', but it's already taken */
|
|
|
|
#if defined (HAVE_TIMEVAL) && (defined (HAVE_SELECT) || defined (HAVE_PSELECT))
|
|
int
|
|
fsleep(sec, usec)
|
|
unsigned int sec, usec;
|
|
{
|
|
int e, r;
|
|
sigset_t blocked_sigs, prevmask;
|
|
#if defined (HAVE_PSELECT)
|
|
struct timespec ts;
|
|
#else
|
|
struct timeval tv;
|
|
#endif
|
|
|
|
sigemptyset (&blocked_sigs);
|
|
# if defined (SIGCHLD)
|
|
sigaddset (&blocked_sigs, SIGCHLD);
|
|
# endif
|
|
|
|
#if defined (HAVE_PSELECT)
|
|
ts.tv_sec = sec;
|
|
ts.tv_nsec = usec * 1000;
|
|
#else
|
|
sigemptyset (&prevmask);
|
|
tv.tv_sec = sec;
|
|
tv.tv_usec = usec;
|
|
#endif /* !HAVE_PSELECT */
|
|
|
|
do
|
|
{
|
|
#if defined (HAVE_PSELECT)
|
|
r = pselect(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &ts, &blocked_sigs);
|
|
#else
|
|
sigprocmask (SIG_SETMASK, &blocked_sigs, &prevmask);
|
|
r = select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv);
|
|
sigprocmask (SIG_SETMASK, &prevmask, NULL);
|
|
#endif
|
|
e = errno;
|
|
if (r < 0 && errno == EINTR)
|
|
return -1; /* caller will handle */
|
|
errno = e;
|
|
}
|
|
while (r < 0 && errno == EINTR);
|
|
|
|
return r;
|
|
}
|
|
#else /* !HAVE_TIMEVAL || !HAVE_SELECT */
|
|
int
|
|
fsleep(sec, usec)
|
|
long sec, usec;
|
|
{
|
|
if (usec >= 500000) /* round */
|
|
sec++;
|
|
return (sleep(sec));
|
|
}
|
|
#endif /* !HAVE_TIMEVAL || !HAVE_SELECT */
|