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2052
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1 /* Provide a replacement for the POSIX nanosleep function. |
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2 Copyright (C) 1999 Free Software Foundation, Inc. |
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3 |
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4 This program is free software; you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 2, or (at your option) |
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7 any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
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15 along with this program; if not, write to the Free Software Foundation, |
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16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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17 |
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18 /* written by Jim Meyering */ |
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19 |
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20 #include <config.h> |
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21 |
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22 #include <sys/types.h> |
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23 |
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24 #include <time.h> |
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25 /* FIXME: is including both like this kosher? */ |
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26 #include <sys/time.h> |
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27 |
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28 static interrupted; |
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29 |
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30 /* Sleep for USEC microseconds. */ |
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31 |
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32 static void |
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33 usleep (const struct timespec *ts_delay) |
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34 { |
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35 struct timeval tv_delay; |
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36 tv_delay.tv_sec = ts_delay->tv_sec; |
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37 tv_delay.tv_usec = 1000 * ts_delay->tv_nsec; |
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38 select (0, (void *) 0, (void *) 0, (void *) 0, tv_delay); |
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39 } |
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40 |
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41 int |
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42 nanosleep (const struct timespec *requested_delay, |
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43 struct timespec *remaining_delay) |
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44 { |
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45 interrupted = 0; |
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46 |
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47 /* set up sig handler -- but maybe only do this the first time? */ |
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48 /* FIXME */ |
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49 |
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50 usleep (requested_delay); |
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51 |
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52 if (interrupted) |
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53 { |
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54 /* Calculate time remaining. */ |
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55 /* FIXME: the code in sleep doesn't use this, so there's no |
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56 rush to implement it. */ |
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57 } |
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58 |
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59 /* FIXME: Restore sig handler? */ |
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60 |
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61 return interrupted; |
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62 } |
