4.4BSD/usr/share/man/cat2/sigsuspend.0

SIGSUSPEND(2)               BSD Programmer's Manual              SIGSUSPEND(2)

NNAAMMEE
     ssiiggssuussppeenndd - atomically release blocked signals and wait for interrupt

SSYYNNOOPPSSIISS
     ##iinncclluuddee <<ssiiggnnaall..hh>>

     _i_n_t
     ssiiggssuussppeenndd(_c_o_n_s_t _s_i_g_s_e_t___t _*_s_i_g_m_a_s_k);

DDEESSCCRRIIPPTTIIOONN
     SSiiggssuussppeenndd() temporarily changes the blocked signal mask to the set to
     which _s_i_g_m_a_s_k points, and then waits for a signal to arrive; on return
     the previous set of masked signals is restored.  The signal mask set is
     usually empty to indicate that all signals are to be unblocked for the
     duration of the call.

     In normal usage, a signal is blocked using sigprocmask(2) to begin a
     critical section, variables modified on the occurrence of the signal are
     examined to determine that there is no work to be done, and the process
     pauses awaiting work by using ssiiggssuussppeenndd() with the previous mask re-
     turned by sigprocmask.

RREETTUURRNN VVAALLUUEESS
     The ssiiggssuussppeenndd() function always terminates by being interrupted, return-
     ing -1 with _e_r_r_n_o set to EINTR.

SSEEEE AALLSSOO
     sigprocmask(2),  sigaction(2),  sigsetops(3)

SSTTAANNDDAARRDDSS
     The ssiiggssuuppeenndd function call conforms to IEEE Std1003.1-1988 (``POSIX'').

4.4BSD                           June 4, 1993                                1