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Diffstat (limited to '')
| -rw-r--r-- | aclocal/bsdsignals.m4 | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/aclocal/bsdsignals.m4 b/aclocal/bsdsignals.m4 new file mode 100644 index 0000000..362ddb5 --- /dev/null +++ b/aclocal/bsdsignals.m4 @@ -0,0 +1,35 @@ +dnl *********** BSD vs. POSIX signal handling ************** +AC_DEFUN([AC_BSD_SIGNALS], [ + AC_MSG_CHECKING(for BSD signal semantics) + AC_CACHE_VAL(knfsd_cv_bsd_signals, + [AC_RUN_IFELSE([AC_LANG_SOURCE([[ + #include <signal.h> + #include <unistd.h> + #include <sys/wait.h> + + static int counter = 0; + static void handler(int num) { counter++; } + + int main() + { + int s; + if ((s = fork()) < 0) return 1; + if (s != 0) { + if (wait(&s) < 0) return 1; + return WIFSIGNALED(s)? 1 : 0; + } + + signal(SIGHUP, handler); + kill(getpid(), SIGHUP); kill(getpid(), SIGHUP); + return (counter == 2)? 0 : 1; + } + ]])],[knfsd_cv_bsd_signals=yes],[knfsd_cv_bsd_signals=no],[ + case "$host_os" in + *linux*) knfsd_cv_bsd_signals=no;; + *bsd*) knfsd_cv_bsd_signals=yes;; + *) AC_MSG_ERROR([unable to guess signal semantics for $host_os; please set knfsd_cv_bsd_signals]);; + esac + ])]) dnl + AC_MSG_RESULT($knfsd_cv_bsd_signals) + test $knfsd_cv_bsd_signals = yes && AC_DEFINE(HAVE_BSD_SIGNALS, 1, [Define this if you want to use BSD signal semantics]) +])dnl |