intSIGVTALRM
-
This signal typically indicates expiration of a timer that measures CPU time used by the current process. The name is an abbreviation for "virtual time alarm".
intSIGPROF
-
This signal is typically indicates expiration of a timer that measures both CPU time used by the current process,and CPU time expended on behalf of the process by the system. Such a timer is used to implement code profiling facilities,hence the name of this signal.
fcntlto enable a particular file descriptior to generate these signals (see section). The default action for these signals is to ignore them.
intSIGIO
-
This signal is sent when a file descriptor is ready to perform input or output.
On most operating systems,terminals and sockets are the only kinds of files that can generateSIGIO; other kinds,including ordinary files,never generateSIGIOeven if you ask them to.
In the GNU systemSIGIOwill always be generated properly if you successfully set asynchronous mode withfcntl.
intSIGURG
-
This signal is sent when "urgent" or out-of-band data arrives on a socket. See section.
intSIGPOLL
-
This is a System V signal name,more or less similar to
SIGIO. It is defined only for compatibility.
intSIGCHLD
-
This signal is sent to a parent process whenever one of its child processes terminates or stops.
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