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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 #include <stdio.h> |
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22 #include <sys/types.h> |
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23 #include <signal.h> |
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24 |
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25 #include <errno.h> |
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26 #ifndef errno |
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27 extern int errno; |
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28 #endif |
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29 |
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30 #if HAVE_UNISTD_H |
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31 # include <unistd.h> |
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32 #endif |
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33 |
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34 #include <time.h> |
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35 /* FIXME: is including both like this kosher? */ |
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36 #include <sys/time.h> |
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37 |
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38 static int suspended; |
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39 |
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40 /* Handle SIGCONT. */ |
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41 |
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42 static void |
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43 sighandler (int sig) |
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44 { |
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45 #ifdef SA_INTERRUPT |
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46 struct sigaction sigact; |
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47 |
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48 sigact.sa_handler = SIG_DFL; |
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49 sigemptyset (&sigact.sa_mask); |
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50 sigact.sa_flags = 0; |
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51 sigaction (sig, &sigact, NULL); |
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52 #else |
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53 signal (sig, SIG_DFL); |
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54 #endif |
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55 |
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56 suspended = 1; |
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57 kill (getpid (), sig); |
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58 } |
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59 |
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60 /* Sleep for USEC microseconds. */ |
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61 |
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62 static void |
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63 my_usleep (const struct timespec *ts_delay) |
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64 { |
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65 struct timeval tv_delay; |
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66 tv_delay.tv_sec = ts_delay->tv_sec; |
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67 tv_delay.tv_usec = 1000 * ts_delay->tv_nsec; |
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68 select (0, (void *) 0, (void *) 0, (void *) 0, &tv_delay); |
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69 } |
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70 |
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71 int |
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72 nanosleep (const struct timespec *requested_delay, |
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73 struct timespec *remaining_delay) |
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74 { |
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75 #ifdef SA_INTERRUPT |
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76 struct sigaction oldact, newact; |
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77 #endif |
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78 |
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79 suspended = 0; |
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80 |
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81 /* set up sig handler -- but maybe only do this the first time? */ |
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82 #ifdef SA_INTERRUPT |
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83 newact.sa_handler = sighandler; |
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84 sigemptyset (&newact.sa_mask); |
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85 newact.sa_flags = 0; |
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86 |
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87 sigaction (SIGCONT, NULL, &oldact); |
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88 if (oldact.sa_handler != SIG_IGN) |
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89 sigaction (SIGCONT, &newact, NULL); |
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90 #else |
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91 if (signal (SIGCONT, SIG_IGN) != SIG_IGN) |
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92 signal (SIGCONT, sighandler); |
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93 #endif |
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94 |
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95 my_usleep (requested_delay); |
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96 |
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97 if (suspended) |
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98 { |
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99 /* Calculate time remaining. */ |
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100 /* FIXME: the code in sleep doesn't use this, so there's no |
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101 rush to implement it. */ |
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102 } |
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103 |
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104 /* FIXME: Restore sig handler? */ |
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105 |
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106 errno = EINTR; |
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107 |
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108 return suspended; |
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109 } |
