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common: New function gnupg_usleep.

* configure.ac (HAVE_NANOSLEEP): Test for nanosleep.
* common/sysutils.c: Always include time.h.
(gnupg_usleep): New.
--

This function has been compiled from nPth and Libassuan.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2016-10-31 12:20:33 +01:00
parent 3b6b8fe32a
commit ad491ceec6
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3 changed files with 56 additions and 1 deletions

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@ -49,8 +49,8 @@
# include <asm/sysinfo.h>
# include <asm/unistd.h>
#endif
#include <time.h>
#ifdef HAVE_SETRLIMIT
# include <time.h>
# include <sys/time.h>
# include <sys/resource.h>
#endif
@ -307,6 +307,50 @@ gnupg_sleep (unsigned int seconds)
}
/* Wrapper around the platforms usleep function. This one won't wake
* up before the sleep time has really elapsed. When build with nPth
* it merely calls npth_usleep and thus suspends only the current
* thread. */
void
gnupg_usleep (unsigned int usecs)
{
#if defined(USE_NPTH)
npth_usleep (usecs);
#elif defined(HAVE_W32_SYSTEM)
Sleep ((usecs + 999) / 1000);
#elif defined(HAVE_NANOSLEEP)
if (usecs)
{
struct timespec req;
struct timespec rem;
req.tv_sec = 0;
req.tv_nsec = usecs * 1000;
while (nanosleep (&req, &rem) < 0 && errno == EINTR)
req = rem;
}
#else /*Standard Unix*/
if (usecs)
{
struct timeval tv;
tv.tv_sec = usecs / 1000000;
tv.tv_usec = usecs % 1000000;
select (0, NULL, NULL, NULL, &tv);
}
#endif
}
/* This function is a NOP for POSIX systems but required under Windows
as the file handles as returned by OS calls (like CreateFile) are
different from the libc file descriptors (like open). This function