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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd"><html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>H</title><link rel="stylesheet" href="doc.css" type="text/css"></head><body><h1>H</h1><dl><dt><a name="*Hup"><code>*Hup</code></a><dd>Global variable holding a (possibly empty) <code>prg</code> body, whichwill be executed when a SIGHUP signal is sent to the current process. Note thatthis mechanism is "unreliable", in the way that when a second signal (it may beSIGINT, SIGUSR1/2, SIGALRM or SIGTERM) arrives before the first signal's<code>prg</code> is running, the first signal will be lost. If the value of<code>*Hup</code> is <code>NIL</code>, the current process will terminate (as ifSIGTERM had been sent). See also <code><ahref="refA.html#alarm">alarm</a></code>, <code><ahref="refR.html#*Run">*Run</a></code>, <code><ahref="refS.html#*Sig1">*Sig[12]</a> and <code><ahref="refE.html#*Err">*Err</a></code>.<p><pre><code>: (de *Hup (msg 'SIGHUP))-> *Hup</code></pre><dt><a name="head"><code>(head 'cnt|lst 'lst) -> lst</code></a><dd>Returns a new list made of the first <code>cnt</code> elements of<code>lst</code>. If <code>cnt</code> is negative, it is added to the length of<code>lst</code>. If the first argument is a <code>lst</code>, <code>head</code>is a predicate function returning that argument list if it is <code>equal</code>to the head of the second argument, and <code>NIL</code> otherwise. See also<code><a href="refT.html#tail">tail</a></code>.<p><pre><code>: (head 3 '(a b c d e f))-> (a b c): (head 0 '(a b c d e f))-> NIL: (head 10 '(a b c d e f))-> (a b c d e f): (head -2 '(a b c d e f))-> (a b c d): (head '(a b c) '(a b c d e f))-> (a b c)</code></pre><dt><a name="heap"><code>(heap 'flg) -> cnt</code></a><dd>Returns the total size of the cell heap space in megabytes. If<code>flg</code> is non-<code>NIL</code>, the size of the currently free spaceis returned. See also <code><a href="refG.html#gc">gc</a></code>.<p><pre><code>: (gc 4)-> 4: (heap)-> 5: (heap T)-> 4</code></pre><dt><a name="hear"><code>(hear 'num|sym) -> any</code></a><dd>Uses the file descriptor <code>num</code>, or opens the file<code>sym</code>, as an asynchronous command input channel. Any executable listreceived via this channel will be executed in the background. As this mechanismis also used for inter-family communication (see <code><ahref="refT.html#tell">tell</a></code>), <code>hear</code> is usually only calledexplicitly by a top level parent process.<p><pre><code>: (hear "fifo/cmd")-> "fifo/cmd"</code></pre><dt><a name="here"><code>(here ['sym]) -> sym</code></a><dd>Echoes the current input stream until <code>sym</code> is encountered, oruntil end of file. See also <code><a href="refE.html#echo">echo</a></code>.<p><pre><code>$ cat hello.l(html 0 "Hello" "lib.css" NIL (<h2> NIL "Hello") (here) )<p>Hello!</p><p>This is a test.</p>$ ./p lib/http.l lib/xhtml.l hello.lHTTP/1.0 200 OKServer: PicoLispDate: Sun, 03 Jun 2007 11:41:27 GMTCache-Control: max-age=0Cache-Control: no-cacheContent-Type: text/html; charset=utf-8<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"><head><title>Hello</title><link rel="stylesheet" href="http://:/lib.css" type="text/css"/></head><body><h2>Hello</h2><p>Hello!</p><p>This is a test.</p></body></html></code></pre><dt><a name="hex"><code>(hex 'num) -> sym<br>(hex 'sym) -> num</code></a><dd>Converts a number <code>num</code> to a hexadecimal string, or a hexadecimalstring <code>sym</code> to a number. See also <code><ahref="refO.html#oct">oct</a></code> and <code><ahref="refF.html#format">format</a></code>.<p><pre><code>: (hex 273)-> "111": (hex "111")-> 273</code></pre><dt><a name="host"><code>(host 'any) -> sym</code></a><dd>Returns the hostname corresponding to the given IP address. See also<code><a href="refA.html#*Adr">*Adr</a></code>.<p><pre><code>: (host "217.160.106.89")-> "software-lab.biz"</code></pre></dl></body></html>⌨️ 快捷键说明
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