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#serial 1
# Determine available signal blocking primitives. Three different APIs exist:
# 1) POSIX: sigemptyset, sigaddset, sigprocmask
# 2) SYSV: sighold, sigrelse
# 3) BSD: sigblock, sigsetmask
# For simplicity, here we check only for the POSIX signal blocking.
AC_DEFUN([gt_SIGNALBLOCKING],
[
signals_not_posix=
AC_EGREP_HEADER(sigset_t, signal.h, , signals_not_posix=1)
if test -z "$signals_not_posix"; then
AC_CHECK_FUNC(sigprocmask,
AC_DEFINE(HAVE_POSIX_SIGNALBLOCKING, 1,
[Define to 1 if you have the sigset_t type and the sigprocmask function.]))
fi
])
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