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| -rw-r--r-- | man7/signal.7 | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/man7/signal.7 b/man7/signal.7 index 9c951def11..47289e9d62 100644 --- a/man7/signal.7 +++ b/man7/signal.7 @@ -126,6 +126,34 @@ Suspends execution until any signal is caught. .BR sigsuspend (2) Temporarily changes the signal mask (see below) and suspends execution until one of the unmasked signals is caught. +.SS Synchronously Accepting a Signal +Rather than asynchronously catching a signal via a signal handler, +it is possible to synchronously accept the signal, that is, +to block execution until the signal is delivered, +at which point the kernel returns information about the +signal to the caller. +There are two general ways to do this: +.IP * 3 +.BR sigwaitinfo (2), +.BR sigtimedwait (2), +and +.BR sigwait (3) +suspend execution until one of the signals in a specified +set is delivered. +Each of these calls returns information about the delivered signal. +.IP * +.BR signalfd (2) +returns a file descriptor that can be used to read information +about signals that are delivered to the caller. +Each +.BR read (2) +from this file descriptor blocks until one of the signals +in the set specified in the +.BR signalfd (2) +call is delivered to the caller. +The buffer returned by +.BR read (2) +contains a structure describing the signal. .SS "Signal Mask and Pending Signals" A signal may be .IR blocked , |