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Diffstat (limited to 'm4/nanosleep.m4')
-rw-r--r-- | m4/nanosleep.m4 | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/m4/nanosleep.m4 b/m4/nanosleep.m4 new file mode 100644 index 0000000..a3a6814 --- /dev/null +++ b/m4/nanosleep.m4 @@ -0,0 +1,116 @@ +#serial 22 + +dnl From Jim Meyering. +dnl Check for the nanosleep function. +dnl If not found, use the supplied replacement. +dnl + +# Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007 Free +# Software Foundation, Inc. + +# This file is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +AC_DEFUN([gl_FUNC_NANOSLEEP], +[ + dnl Persuade glibc and Solaris <time.h> to declare nanosleep. + AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) + + AC_REQUIRE([gl_HEADER_TIME_H_DEFAULTS]) + AC_REQUIRE([gl_CLOCK_TIME]) + AC_CHECK_HEADERS_ONCE(sys/time.h) + + nanosleep_save_libs=$LIBS + + # Solaris 2.5.1 needs -lposix4 to get the nanosleep function. + # Solaris 7 prefers the library name -lrt to the obsolescent name -lposix4. + AC_SEARCH_LIBS([nanosleep], [rt posix4], + [test "$ac_cv_search_nanosleep" = "none required" || + LIB_NANOSLEEP=$ac_cv_search_nanosleep]) + + AC_CACHE_CHECK([for working nanosleep], + [gl_cv_func_nanosleep], + [ + AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ + #include <errno.h> + #include <limits.h> + #include <signal.h> + #if HAVE_SYS_TIME_H + #include <sys/time.h> + #endif + #include <time.h> + #include <unistd.h> + #define TYPE_SIGNED(t) (! ((t) 0 < (t) -1)) + #define TYPE_MAXIMUM(t) \ + ((t) (! TYPE_SIGNED (t) \ + ? (t) -1 \ + : ~ (~ (t) 0 << (sizeof (t) * CHAR_BIT - 1)))) + + static void + check_for_SIGALRM (int sig) + { + if (sig != SIGALRM) + _exit (1); + } + + int + main () + { + static struct timespec ts_sleep; + static struct timespec ts_remaining; + static struct sigaction act; + if (! nanosleep) + return 1; + act.sa_handler = check_for_SIGALRM; + sigemptyset (&act.sa_mask); + sigaction (SIGALRM, &act, NULL); + ts_sleep.tv_sec = 0; + ts_sleep.tv_nsec = 1; + alarm (1); + if (nanosleep (&ts_sleep, NULL) != 0) + return 1; + ts_sleep.tv_sec = TYPE_MAXIMUM (time_t); + ts_sleep.tv_nsec = 999999999; + alarm (1); + if (nanosleep (&ts_sleep, &ts_remaining) == -1 && errno == EINTR + && TYPE_MAXIMUM (time_t) - 10 < ts_remaining.tv_sec) + return 0; + return 119; + }]])], + [gl_cv_func_nanosleep=yes], + [case $? in dnl ( + 119) gl_cv_func_nanosleep='no (mishandles large arguments)';; dnl ( + *) gl_cv_func_nanosleep=no;; + esac], + [gl_cv_func_nanosleep=cross-compiling]) + ]) + if test "$gl_cv_func_nanosleep" = yes; then + REPLACE_NANOSLEEP=0 + else + REPLACE_NANOSLEEP=1 + if test "$gl_cv_func_nanosleep" = 'no (mishandles large arguments)'; then + AC_DEFINE([HAVE_BUG_BIG_NANOSLEEP], 1, + [Define to 1 if nanosleep mishandle large arguments.]) + for ac_lib in $LIB_CLOCK_GETTIME; do + case " $LIB_NANOSLEEP " in + *" $ac_lib "*) ;; + *) LIB_NANOSLEEP="$LIB_NANOSLEEP $ac_lib";; + esac + done + fi + AC_LIBOBJ(nanosleep) + gl_PREREQ_NANOSLEEP + fi + + AC_SUBST([LIB_NANOSLEEP]) + LIBS=$nanosleep_save_libs +]) + +# Prerequisites of lib/nanosleep.c. +AC_DEFUN([gl_PREREQ_NANOSLEEP], +[ + AC_CHECK_FUNCS_ONCE(siginterrupt) + AC_CHECK_HEADERS_ONCE(sys/select.h) +]) |