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SIGHUP
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<p>On <a href="/facts/POSIX/mQkSt234">POSIX</a>-compliant platforms, SIGHUP ("signal hang up") is a <a href="/facts/Signal_(IPC)/IN6VK6r8">signal</a> sent to a <a href="/facts/Process_(computing)/Vcq7EnUV">process</a> when its controlling terminal is closed. It was originally designed to notify the process of a <a href="/facts/RS-232/NCpvGuyq">serial line</a> drop. SIGHUP is a <a href="/facts/C_preprocessor/KuhuxKYP">symbolic constant</a> defined in the <a href="/facts/Header_file/fg3KEG4V">header file</a> <a href="/facts/Signal.h/MuqE6gqd">signal.h</a>. </p>