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comparison lib/nanosleep.c @ 5060:4e59cddb690f

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nanosleep merge from coreutils
author Paul Eggert <eggert@cs.ucla.edu>
date Thu, 13 May 2004 22:20:53 +0000
parents e22be96e00a6
children a535859efd14
comparison
equal deleted inserted replaced
5059:eb3efcec6ae2 5060:4e59cddb690f
1 /* Provide a replacement for the POSIX nanosleep function. 1 /* Provide a replacement for the POSIX nanosleep function.
2 Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc. 2 Copyright (C) 1999, 2000, 2002, 2004 Free Software Foundation, Inc.
3 3
4 This program is free software; you can redistribute it and/or modify 4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by 5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option) 6 the Free Software Foundation; either version 2, or (at your option)
7 any later version. 7 any later version.
43 # define SIGCONT SIGTERM 43 # define SIGCONT SIGTERM
44 #endif 44 #endif
45 45
46 #include "timespec.h" 46 #include "timespec.h"
47 47
48 static int suspended; 48 static sig_atomic_t volatile suspended;
49 int first_call = 1;
50 49
51 /* Handle SIGCONT. */ 50 /* Handle SIGCONT. */
52 51
53 static void 52 static void
54 sighandler (int sig) 53 sighandler (int sig)
61 static void 60 static void
62 my_usleep (const struct timespec *ts_delay) 61 my_usleep (const struct timespec *ts_delay)
63 { 62 {
64 struct timeval tv_delay; 63 struct timeval tv_delay;
65 tv_delay.tv_sec = ts_delay->tv_sec; 64 tv_delay.tv_sec = ts_delay->tv_sec;
66 tv_delay.tv_usec = ts_delay->tv_nsec / 1000; 65 tv_delay.tv_usec = (ts_delay->tv_nsec + 999) / 1000;
66 if (tv_delay.tv_usec == 1000000)
67 {
68 tv_delay.tv_sec++;
69 tv_delay.tv_usec = 0;
70 }
67 select (0, (void *) 0, (void *) 0, (void *) 0, &tv_delay); 71 select (0, (void *) 0, (void *) 0, (void *) 0, &tv_delay);
68 } 72 }
69 73
70 /* FIXME: comment */ 74 /* FIXME: comment */
71 75
72 int 76 int
73 rpl_nanosleep (const struct timespec *requested_delay, 77 rpl_nanosleep (const struct timespec *requested_delay,
74 struct timespec *remaining_delay) 78 struct timespec *remaining_delay)
75 { 79 {
80 static int initialized;
81
76 #ifdef SA_NOCLDSTOP 82 #ifdef SA_NOCLDSTOP
77 struct sigaction oldact, newact; 83 struct sigaction oldact, newact;
78 #endif 84 #endif
79 85
80 suspended = 0; 86 suspended = 0;
81 87
82 /* set up sig handler */ 88 /* set up sig handler */
83 if (first_call) 89 if (! initialized)
84 { 90 {
85 #ifdef SA_NOCLDSTOP 91 #ifdef SA_NOCLDSTOP
86 newact.sa_handler = sighandler; 92 newact.sa_handler = sighandler;
87 sigemptyset (&newact.sa_mask); 93 sigemptyset (&newact.sa_mask);
88 newact.sa_flags = 0; 94 newact.sa_flags = 0;
92 sigaction (SIGCONT, &newact, NULL); 98 sigaction (SIGCONT, &newact, NULL);
93 #else 99 #else
94 if (signal (SIGCONT, SIG_IGN) != SIG_IGN) 100 if (signal (SIGCONT, SIG_IGN) != SIG_IGN)
95 signal (SIGCONT, sighandler); 101 signal (SIGCONT, sighandler);
96 #endif 102 #endif
97 first_call = 0; 103 initialized = 1;
98 } 104 }
99 105
100 my_usleep (requested_delay); 106 my_usleep (requested_delay);
101 107
102 if (suspended) 108 if (suspended)