Signal Handling--ref

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 toSIGIO. 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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