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35 .Nd select a set of signals
41 .Fn sigwait "const sigset_t * restrict set" "int * restrict sig"
45 system call selects a set of signals, specified by
47 If none of the selected signals are pending,
49 waits until one or more of the selected signals has been generated.
52 atomically clears one of the selected signals from the set of pending signals
53 for the process and sets the location pointed to by
55 to the signal number that was cleared.
57 The signals specified by
59 should be blocked at the time of the call to
62 If more than one thread is using
64 to wait for the same signal, no more than one of these threads will return from
66 with the signal number.
67 If more than a single thread is blocked in
69 for a signal when that signal is generated for the process, it is unspecified
70 which of the waiting threads returns from
72 If the signal is generated for a specific thread, as by
74 only that thread will return.
76 Should any of the multiple pending signals in the range
81 selected, it will be the lowest numbered one.
82 The selection order between realtime
83 and non-realtime signals, or between multiple pending non-realtime signals,
88 returns 0 and sets the location pointed to by
90 to the cleared signal number.
91 Otherwise, an error number is returned.
95 system call will fail if:
101 specifies one or more invalid signal numbers.
103 Any arguments point outside the allocated address space or there is a
104 memory protection fault.
114 .Xr pthread_sigmask 3