Signal Handling--ref

The default action for this signal is to ignore it. If you establish a handler for this signal while there are child processes that have terminated but not reported their status viawaitorwaitpid(see section),whether your new handler applies to those processes or not depends on the particular operating system.

intSIGCLD

This is an obsolete name forSIGCHLD.

intSIGCONT

You can send aSIGCONTsignal to a process to make it continue. This signal is special--it always makes the process continue if it is stopped,before the signal is delivered. The default behavior is to do nothing else. You cannot block this signal. You can set a handler,butSIGCONTalways makes the process continue regardless.

Most programs have no reason to handleSIGCONT; they simply resume execution without realizing they were ever stopped. You can use a handler forSIGCONTto make a program do something special when it is stopped and continued--for example,to reprint a prompt when it is suspended while waiting for input.

intSIGSTOP

TheSIGSTOPsignal stops the process. It cannot be handled,ignored,or blocked.

intSIGTSTP

TheSIGTSTPsignal is an interactive stop signal. UnlikeSIGSTOP,this signal can be handled and ignored.

Your program should handle this signal if you have a special need to leave files or system tables in a secure state when a process is stopped. For example,programs that turn off echoing should handleSIGTSTPso they can turn echoing back on before stopping.

This signal is generated when the user types the SUSP character (normallyC-z). For more information about terminal driver support,see section.

intSIGTTIN

A process cannot read from the the user's terminal while it is running as a background job. When any process in a background job tries to read from the terminal,all of the processes in the job are sent aSIGTTINsignal. The default action for this signal is to stop the process. For more information about how this interacts with the terminal driver,see section.

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