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SIGHUP
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==Details== Symbolic signal names are used because signal numbers can vary across platforms, but [[Single UNIX Specification|XSI]]-conformant systems allow the use of the numeric constant 1 to be used to indicate a SIGHUP, which the vast majority of systems in fact use. SIGHUP can be [[Signal_(IPC)#Handling_signals|handled]]. That is, [[programmer]]s can define the action they want to occur upon receiving a SIGHUP, such as calling a [[subroutine|function]], ignoring it, or restoring the default action. The default action on [[POSIX]]-compliant systems is an abnormal termination.
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