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$FreeBSD: src/lib/libc_r/man/sigwait.3,v 1.7 2001/10/01 16:09:09 ru Exp $
.Dd April 27, 2000 .Dt SIGWAIT 2 .Os .Sh NAME .Nm sigwait .Nd select a set of signals .Sh SYNOPSIS n signal.h .Ft int .Fn sigwait "const sigset_t *restrict set" "int *restrict sig" .Sh DESCRIPTION The .Fn sigwait function selects a set of signals, specified by .Fa set . If none of the selected signals are pending, .Fn sigwait waits until one or more of the selected signals has been generated. Then .Fn sigwait atomically clears one of the selected signals from the set of pending signals for the process and sets the location pointed to by .Fa sig to the signal number that was cleared.
p The signals specified by .Fa set should be blocked, but not ignored, at the time of the call to .Fn sigwait .
p Processes which call .Fn sigwait on ignored signals will wait indefinitely. Ignored signals are dropped immediately by the system, before delivery to a waiting process. .Sh RETURN VALUES If successful, .Fn sigwait returns 0 and sets the location pointed to by .Fa sig to the cleared signal number. Otherwise, an error number is returned. .Sh ERRORS .Fn sigwait will fail if: l -tag -width Er t Bq Er EINVAL .Fa set specifies one or more invalid signal numbers. .El .Sh SEE ALSO .Xr pthread_sigmask 2 , .Xr sigaction 2 , .Xr sigpending 2 , .Xr sigsuspend 2 , .Xr pause 3 .Sh STANDARDS .Fn sigwait conforms to ISO/IEC 9945-1:1996 (``POSIX.1'')