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    1: /*
    2:  * Copyright (c) 2009-2011 Todd C. Miller <Todd.Miller@courtesan.com>
    3:  *
    4:  * Permission to use, copy, modify, and distribute this software for any
    5:  * purpose with or without fee is hereby granted, provided that the above
    6:  * copyright notice and this permission notice appear in all copies.
    7:  *
    8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   15:  */
   16: 
   17: #include <config.h>
   18: 
   19: #include <sys/types.h>
   20: #include <sys/time.h>
   21: #ifdef HAVE_SYS_SELECT_H
   22: #include <sys/select.h>
   23: #endif /* HAVE_SYS_SELECT_H */
   24: #if TIME_WITH_SYS_TIME
   25: # include <time.h>
   26: #endif
   27: #ifndef HAVE_STRUCT_TIMESPEC
   28: # include "compat/timespec.h"
   29: #endif
   30: #include <errno.h>
   31: 
   32: #include "missing.h"
   33: 
   34: int
   35: nanosleep(const struct timespec *ts, struct timespec *rts)
   36: {
   37:     struct timeval timeout, endtime, now;
   38:     int rval;
   39: 
   40:     timeout.tv_sec = ts->tv_sec;
   41:     timeout.tv_usec = ts->tv_nsec / 1000;
   42:     if (rts != NULL) {
   43: 	gettimeofday(&endtime, NULL);
   44: 	timevaladd(&endtime, &timeout);
   45:     }
   46:     rval = select(0, NULL, NULL, NULL, &timeout);
   47:     if (rts != NULL && rval == -1 && errno == EINTR) {
   48: 	gettimeofday(&now, NULL);
   49: 	timevalsub(&endtime, &now);
   50: 	rts->tv_sec = endtime.tv_sec;
   51: 	rts->tv_nsec = endtime.tv_usec * 1000;
   52:     }
   53:     return rval;
   54: }