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SIGSUSPEND(2) UNIX Programmer's Manual SIGSUSPEND(2)
NNAAMMEE
ssiiggssuussppeenndd - atomically release blocked signals and wait for interrupt
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssyyss//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 Std1003.11988 (``POSIX'').
BSD Experimental July 23, 1991 1