kc3-lang/gnulib/lib/nanosleep.c

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• Hash : 7c3f8da8
  Author :
  Date : 2005-09-23T04:15:13
  

  Sync from coreutils.
  
  * .cppi-disable: Add regcomp.c, regex_internal.c, regex_internal.h,
  stat-time.h.
  * argmatch.h: Include verify.h
  (ARGMATCH_VERIFY): Use verify rather than rolling our own.
  (ARGMATCH_ASSERT): Remove; unused.
  * canonicalize.c: Assume STDC_HEADERS.
  * exclude.c: Include "strcase.h".
  * regex_internal.h [!defined _LIBC]: Likewise.
  * getusershell.c: Include stdio--.h rather than stdio.h
  and stdio-safer.h.
  (getusershell): Call fopen, not fopen_safer.
  * save-cwd.c: Include fcntl--.h rather than fcntl.h.
  Do not include unistd-safer.h.
  (save_cwd): Don't call fd_safer; no longer needed
  now that we include fcntl--.h.
  
  * modules/argmatch (Depends-on): Add verify.
  * modules/getloadavg (Depends-on): Depend on fcntl-safer, not
  unistd-safer.
  * modules/save-cwd (Depends-on): Likewise.
  
  * backupfile.m4, calloc.m4, chown.m4, cloexec.m4, dup2.m4:
  * fileblocks.m4, free.m4, ftruncate.m4, getcwd.m4, getpagesize.m4:
  * getugroups.m4, group-member.m4, idcache.m4, link-follow.m4:
  * mkstemp.m4, mktime.m4, mountlist.m4, nanosleep.m4, pathmax.m4:
  * physmem.m4, posixver.m4, putenv.m4, safe-read.m4, same.m4:
  * save-cwd.m4, stdio-safer.m4, unistd-safer.m4, unlinkdir.m4:
  * userspec.m4, xgetcwd.m4, xreadlink.m4:
  Don't bother checking for string.h, stdlib.h, unistd.h.
  * fts.m4 (gl_FUNC_FTS_CORE): Don't require
  AC_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK; that's now the lstat
  module's job.
  * jm-macros.m4 (gl_MACROS): Likewise.
  * prereq.m4 (gl_PREREQ): Add gl_FUNC_LSTAT.
  
  * backupfile.c: Use ARGMATCH_VERIFY, just in case.
  * posixtm.c (posixtime) [lint]: Initialize *all* of tm0, not just
  the .tm_year member, since otherwise gcc-4.0 would now warn about
  tm_zone, tm_gmtoff, tm_isdst, tm_yday, tm_wday.
  * quotearg.c (quotearg_n_options): Change code to be suboptimal, in
  order to avoid an unsuppressible warning from gcc on 64-bit systems.
  
  * lstat.m4 (gl_FUNC_LSTAT):
  Use AC_LIBSOURCES to require lstat.c and lstat.h.
  Remove obsolete comment.
  * xreadlink.m4: Use AC_LIBSOURCES and AC_LIBOBJ.
  * xstrtod.m4: Likewise.
  

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• lib/nanosleep.c

• /* Provide a replacement for the POSIX nanosleep function.
     Copyright (C) 1999, 2000, 2002, 2004, 2005 Free Software Foundation, Inc.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2, or (at your option)
     any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software Foundation,
     Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  
  /* written by Jim Meyering */
  
  #ifdef HAVE_CONFIG_H
  # include <config.h>
  #endif
  
  /* Undefine nanosleep here so any prototype is not redefined to be a
     prototype for rpl_nanosleep. (they'd conflict e.g., on alpha-dec-osf3.2)  */
  #undef nanosleep
  
  #include <stdbool.h>
  #include <stdio.h>
  #include <sys/types.h>
  #include <signal.h>
  
  #include <errno.h>
  
  #include <unistd.h>
  
  #include "timespec.h"
  
  /* Some systems (MSDOS) don't have SIGCONT.
     Using SIGTERM here turns the signal-handling code below
     into a no-op on such systems. */
  #ifndef SIGCONT
  # define SIGCONT SIGTERM
  #endif
  
  #if ! HAVE_SIGINTERRUPT
  # define siginterrupt(sig, flag) /* empty */
  #endif
  
  static sig_atomic_t volatile suspended;
  
  /* Handle SIGCONT. */
  
  static void
  sighandler (int sig)
  {
    suspended = 1;
  }
  
  /* FIXME: comment */
  
  static void
  my_usleep (const struct timespec *ts_delay)
  {
    struct timeval tv_delay;
    tv_delay.tv_sec = ts_delay->tv_sec;
    tv_delay.tv_usec = (ts_delay->tv_nsec + 999) / 1000;
    if (tv_delay.tv_usec == 1000000)
      {
        tv_delay.tv_sec++;
        tv_delay.tv_usec = 0;
      }
    select (0, NULL, NULL, NULL, &tv_delay);
  }
  
  /* FIXME: comment */
  
  int
  rpl_nanosleep (const struct timespec *requested_delay,
  	       struct timespec *remaining_delay)
  {
    static bool initialized;
  
    /* set up sig handler */
    if (! initialized)
      {
  #ifdef SA_NOCLDSTOP
        struct sigaction oldact, newact;
        newact.sa_handler = sighandler;
        sigemptyset (&newact.sa_mask);
        newact.sa_flags = 0;
  
        sigaction (SIGCONT, NULL, &oldact);
        if (oldact.sa_handler != SIG_IGN)
  	sigaction (SIGCONT, &newact, NULL);
  #else
        if (signal (SIGCONT, SIG_IGN) != SIG_IGN)
  	{
  	  signal (SIGCONT, sighandler);
  	  siginterrupt (SIGCONT, 1);
  	}
  #endif
        initialized = true;
      }
  
    suspended = 0;
  
    my_usleep (requested_delay);
  
    if (suspended)
      {
        /* Calculate time remaining.  */
        /* FIXME: the code in sleep doesn't use this, so there's no
  	 rush to implement it.  */
  
        errno = EINTR;
      }
  
    /* FIXME: Restore sig handler?  */
  
    return suspended;
  }
  

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