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role="note" class="hatnote navigation-not-searchable">This article is about the UNIX error code. For the Robin Williams book <i>The Mac Is Not a Typewriter</i>, see <a href="/wiki/Robin_Williams_(writer)" title="Robin Williams (writer)">Robin Williams (writer)</a>.</div> <div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Unix error code</div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:NotATypeWriter.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1f/NotATypeWriter.png/500px-NotATypeWriter.png" decoding="async" width="500" height="278" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/1/1f/NotATypeWriter.png 1.5x" data-file-width="720" data-file-height="400" /></a><figcaption>"Not a Typewriter" error code in Linux.</figcaption></figure> <p>In <a href="/wiki/Computing" title="Computing">computing</a>, "<b>Not a <a href="/wiki/Typewriter" title="Typewriter">typewriter</a></b>" or <b>ENOTTY</b><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> is an error code defined in the <a href="/wiki/Errno.h" title="Errno.h">errno.h</a> found on many <a href="/wiki/Unix" title="Unix">Unix</a> systems. This code is now used to indicate that an invalid <a href="/wiki/Ioctl" title="Ioctl">ioctl</a> (input/output control) number was specified in an ioctl <a href="/wiki/System_call" title="System call">system call</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Details">Details</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Not_a_typewriter&action=edit&section=1" title="Edit section: Details"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This error originated in early <a href="/wiki/Unix" title="Unix">UNIX</a>. In Version 6 UNIX and earlier, I/O control was limited to serial-connected <a href="/wiki/Computer_terminal" title="Computer terminal">terminal</a> devices, typically a <a href="/wiki/Teleprinter" title="Teleprinter">teletype</a> (abbreviated TTY), through the gtty and stty system calls.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> If an attempt was made to use these calls on a non-terminal device, the error generated was <i>ENOTTY</i>. When the stty/gtty system calls were replaced with the more general <a href="/wiki/Ioctl" title="Ioctl">ioctl</a> (I/O control) call, the <i>ENOTTY</i> error code was retained. </p><p>Early computers and <a href="/wiki/Unix" title="Unix">Unix</a> systems used electromechanical <a href="/wiki/Typewriter" title="Typewriter">typewriters</a> as <a href="/wiki/Computer_terminal" title="Computer terminal">terminals</a>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> The abbreviation TTY, which occurs widely in modern UNIX systems, stands for "<a href="/wiki/Teleprinter" title="Teleprinter">Teletypewriter</a>." For example, the original meaning of the <a href="/wiki/SIGHUP" title="SIGHUP">SIGHUP</a> <a href="/wiki/Signal_(IPC)" title="Signal (IPC)">signal</a> is that it <i>Hangs UP</i> the <a href="/wiki/Landline" title="Landline">phone line</a> on the teletypewriter which uses it. The generic term "typewriter" was probably used because "Teletype" was a registered trademark of <a href="/wiki/AT%26T_Corporation" title="AT&T Corporation">AT&T</a> subsidiary <a href="/wiki/Teletype_Corporation" title="Teletype Corporation">Teletype Corporation</a> and was too specific. The name "Teletype" was derived from the more general term, "teletypewriter"; using "typewriter" was a different contraction of the same original term. </p><p>POSIX sidesteps this issue by describing <i>ENOTTY</i> as meaning "not a terminal".<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>Because ioctl is now supported on other devices than terminals, some systems display a different message such as "Inappropriate <a href="/wiki/Ioctl" title="Ioctl">ioctl</a> for device" instead.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Occurrence">Occurrence</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Not_a_typewriter&action=edit&section=2" title="Edit section: Occurrence"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In some cases, this message will occur even when no <a href="/wiki/Ioctl" title="Ioctl">ioctl</a> has been issued by the program. This is due to the way the isatty() library routine works. The error code errno is only set when a system call fails. One of the first system calls made by the C standard I/O library is in an isatty() call used to determine if the program is being run interactively by a human (in which case isatty() will succeed and the library will write its output a line at a time so the user sees a regular flow of text) or as part of a pipeline (in which case it writes a block at a time for efficiency). If a library routine fails for some reason unrelated to a system call (for example, because a user name wasn't found in the password file) and a naïve programmer blindly calls the normal error reporting routine perror() on every failure, the leftover ENOTTY will result in an utterly inappropriate "Not a typewriter" (or "Not a teletype", or "Inappropriate ioctl for device") being delivered to the user. </p><p>For many years the UNIX <a href="/wiki/Mail_transfer_agent" class="mw-redirect" title="Mail transfer agent">mail program</a> <a href="/wiki/Sendmail" title="Sendmail">sendmail</a><sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> contained this bug: when mail was delivered from another system, the mail program was being run non-interactively. If the destination address was local, but referred to a user name not found in the local password file, the message sent back to the originator of the email was the announcement that the person they were attempting to communicate with was not a typewriter. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Not_a_typewriter&action=edit&section=3" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Lp0_on_fire" title="Lp0 on fire">lp0 on fire</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Not_a_typewriter&action=edit&section=4" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.abbreviations.com/ENOTTY">"What does ENOTTY stand for?"</a>. <i>www.abbreviations.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2020-07-16</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.abbreviations.com&rft.atitle=What+does+ENOTTY+stand+for%3F&rft_id=https%3A%2F%2Fwww.abbreviations.com%2FENOTTY&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANot+a+typewriter" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://man.cat-v.org/unix-6th/2/">Version 6 UNIX manual, section 2, system calls</a></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation book cs1"><a rel="nofollow" class="external text" href="https://www.bell-labs.com/usr/dmr/www/1stEdman.html"><i>Unix Programmer's Manual</i></a>. November 3, 1971.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Unix+Programmer%27s+Manual&rft.date=1971-11-03&rft_id=https%3A%2F%2Fwww.bell-labs.com%2Fusr%2Fdmr%2Fwww%2F1stEdman.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANot+a+typewriter" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><a href="/wiki/RFC_(identifier)" class="mw-redirect" title="RFC (identifier)">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc1">1</a>, <i>Host Software</i>, Steve Crocker (7 April 1969). Page 3, section "Simple use".</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://pubs.opengroup.org/onlinepubs/9699919799/functions/isatty.html">"The Open Group Base Specifications Issue 7, 2018 edition/IEEE Std 1003.1-2017: isatty"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+Open+Group+Base+Specifications+Issue+7%2C+2018+edition%2FIEEE+Std+1003.1-2017%3A+isatty&rft_id=https%3A%2F%2Fpubs.opengroup.org%2Fonlinepubs%2F9699919799%2Ffunctions%2Fisatty.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANot+a+typewriter" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://man.openbsd.org/errno">"OpenBSD manual: intro, errno — introduction to system calls and error numbers"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=OpenBSD+manual%3A+intro%2C+errno+%E2%80%94+introduction+to+system+calls+and+error+numbers&rft_id=https%3A%2F%2Fman.openbsd.org%2Ferrno&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANot+a+typewriter" class="Z3988"></span></span> </li> <li id="cite_note-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-7">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.freebsd.org/cgi/man.cgi?query=errno&apropos=0&sektion=0&manpath=FreeBSD+14.0-current&arch=default&format=html">"FreeBSD manual: intro -- introduction to system calls and error numbers"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=FreeBSD+manual%3A+intro+--+introduction+to+system+calls+and+error+numbers&rft_id=https%3A%2F%2Fwww.freebsd.org%2Fcgi%2Fman.cgi%3Fquery%3Derrno%26apropos%3D0%26sektion%3D0%26manpath%3DFreeBSD%2B14.0-current%26arch%3Ddefault%26format%3Dhtml&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANot+a+typewriter" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://support.apple.com/kb/TA31349">A/UX: mail and "not a typewriter" (2/95)</a> article TA31349 on support.apple.com (February 27, 1995)</span> </li> </ol></div></div> <div 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