1 /* Provide a replacement for the POSIX nanosleep function.
2 Copyright (C) 1999 Free Software Foundation, Inc.
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
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* written by Jim Meyering */
22 #include <sys/types.h>
26 /* FIXME: is including both like this kosher? */
37 struct sigaction sigact;
39 sigact.sa_handler = SIG_DFL;
40 sigemptyset (&sigact.sa_mask);
42 sigaction (sig, &sigact, NULL);
44 signal (sig, SIG_DFL);
48 kill (getpid (), sig);
51 /* Sleep for USEC microseconds. */
54 usleep (const struct timespec *ts_delay)
56 struct timeval tv_delay;
57 tv_delay.tv_sec = ts_delay->tv_sec;
58 tv_delay.tv_usec = 1000 * ts_delay->tv_nsec;
59 select (0, (void *) 0, (void *) 0, (void *) 0, tv_delay);
63 nanosleep (const struct timespec *requested_delay,
64 struct timespec *remaining_delay)
67 struct sigaction oldact, newact;
72 /* set up sig handler -- but maybe only do this the first time? */
74 newact.sa_handler = sighandler;
75 sigemptyset (&newact.sa_mask);
78 sigaction (SIGCONT, NULL, &oldact);
79 if (oldact.sa_handler != SIG_IGN)
80 sigaction (SIGCONT, &newact, NULL);
82 if (signal (SIGCONT, SIG_IGN) != SIG_IGN)
83 signal (SIGCONT, sighandler);
86 usleep (requested_delay);
90 /* Calculate time remaining. */
91 /* FIXME: the code in sleep doesn't use this, so there's no
92 rush to implement it. */
95 /* FIXME: Restore sig handler? */