4 dnl Check for the nanosleep function.
5 dnl If not found, use the supplied replacement.
8 # Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006 Free Software
11 # This file is free software; the Free Software Foundation
12 # gives unlimited permission to copy and/or distribute it,
13 # with or without modifications, as long as this notice is preserved.
15 AC_DEFUN([gl_FUNC_NANOSLEEP],
17 dnl Persuade glibc and Solaris <time.h> to declare nanosleep.
18 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
20 AC_REQUIRE([AC_HEADER_TIME])
21 AC_CHECK_HEADERS_ONCE(sys/time.h)
23 nanosleep_save_libs=$LIBS
25 # Solaris 2.5.1 needs -lposix4 to get the nanosleep function.
26 # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4.
27 AC_SEARCH_LIBS([nanosleep], [rt posix4],
28 [test "$ac_cv_search_nanosleep" = "none required" ||
29 LIB_NANOSLEEP=$ac_cv_search_nanosleep])
30 AC_SUBST([LIB_NANOSLEEP])
32 AC_CACHE_CHECK([for nanosleep],
33 [gl_cv_func_nanosleep],
35 AC_LINK_IFELSE([AC_LANG_SOURCE([[
36 # if TIME_WITH_SYS_TIME
37 # include <sys/time.h>
41 # include <sys/time.h>
50 struct timespec ts_sleep, ts_remaining;
53 return nanosleep (&ts_sleep, &ts_remaining) < 0;
56 [gl_cv_func_nanosleep=yes],
57 [gl_cv_func_nanosleep=no])
59 if test $gl_cv_func_nanosleep = no; then
61 AC_DEFINE(nanosleep, rpl_nanosleep,
62 [Define to rpl_nanosleep if the replacement function should be used.])
66 LIBS=$nanosleep_save_libs
69 # Prerequisites of lib/nanosleep.c.
70 AC_DEFUN([gl_PREREQ_NANOSLEEP],
72 AC_CHECK_FUNCS_ONCE(siginterrupt)
73 AC_CHECK_HEADERS_ONCE(sys/select.h)