272 lines
6.6 KiB
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272 lines
6.6 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of UNLOCKED_STDIO</TITLE>
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</HEAD><BODY>
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<H1>UNLOCKED_STDIO</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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getc_unlocked, getchar_unlocked, putc_unlocked,
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putchar_unlocked - nonlocking stdio functions
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/stdio.h">stdio.h</A>></B>
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<B>int getc_unlocked(FILE *</B><I>stream</I><B>);</B>
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<B>int getchar_unlocked(void);</B>
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<B>int putc_unlocked(int </B><I>c</I><B>, FILE *</B><I>stream</I><B>);</B>
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<B>int putchar_unlocked(int </B><I>c</I><B>);</B>
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<B>void clearerr_unlocked(FILE *</B><I>stream</I><B>);</B>
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<B>int feof_unlocked(FILE *</B><I>stream</I><B>);</B>
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<B>int ferror_unlocked(FILE *</B><I>stream</I><B>);</B>
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<B>int fileno_unlocked(FILE *</B><I>stream</I><B>);</B>
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<B>int fflush_unlocked(FILE *</B><I>stream</I><B>);</B>
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<B>int fgetc_unlocked(FILE *</B><I>stream</I><B>);</B>
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<B>int fputc_unlocked(int </B><I>c</I><B>, FILE *</B><I>stream</I><B>);</B>
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<B>size_t fread_unlocked(void *</B><I>ptr</I><B>, size_t </B><I>size</I><B>, size_t </B><I>n</I><B>,</B>
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<B> FILE *</B><I>stream</I><B>);</B>
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<B>size_t fwrite_unlocked(const void *</B><I>ptr</I><B>, size_t </B><I>size</I><B>, size_t </B><I>n</I><B>,</B>
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<B> FILE *</B><I>stream</I><B>);</B>
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<B>char *fgets_unlocked(char *</B><I>s</I><B>, int </B><I>n</I><B>, FILE *</B><I>stream</I><B>);</B>
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<B>int fputs_unlocked(const char *</B><I>s</I><B>, FILE *</B><I>stream</I><B>);</B>
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<B>#include <<A HREF="file:///usr/include/wchar.h">wchar.h</A>></B>
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<B>wint_t getwc_unlocked(FILE *</B><I>stream</I><B>);</B>
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<B>wint_t getwchar_unlocked(void);</B>
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<B>wint_t fgetwc_unlocked(FILE *</B><I>stream</I><B>);</B>
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<B>wint_t fputwc_unlocked(wchar_t </B><I>wc</I><B>, FILE *</B><I>stream</I><B>);</B>
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<B>wint_t putwc_unlocked(wchar_t </B><I>wc</I><B>, FILE *</B><I>stream</I><B>);</B>
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<B>wint_t putwchar_unlocked(wchar_t </B><I>wc</I><B>);</B>
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<B>wchar_t *fgetws_unlocked(wchar_t *</B><I>ws</I><B>, int </B><I>n</I><B>, FILE *</B><I>stream</I><B>);</B>
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<B>int fputws_unlocked(const wchar_t *</B><I>ws</I><B>, FILE *</B><I>stream</I><B>);</B>
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</PRE>
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<P>
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Feature Test Macro Requirements for glibc (see
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
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<P>
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<B>getc_unlocked</B>(),
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<B>getchar_unlocked</B>(),
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<B>putc_unlocked</B>(),
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<B>putchar_unlocked</B>():
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<DL COMPACT><DT id="1"><DD>
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/* Since glibc 2.24: */ _POSIX_C_SOURCE >= 199309L
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<BR> || /* Glibc versions <= 2.23: */ _POSIX_C_SOURCE
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<BR> || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
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</DL>
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<P>
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<B>clearerr_unlocked</B>(),
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<B>feof_unlocked</B>(),
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<B>ferror_unlocked</B>(),
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<B>fileno_unlocked</B>(),
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<B>fflush_unlocked</B>(),
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<B>fgetc_unlocked</B>(),
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<B>fputc_unlocked</B>(),
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<B>fread_unlocked</B>(),
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<B>fwrite_unlocked</B>():
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<DL COMPACT><DT id="2"><DD>
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/* Glibc since 2.19: */ _DEFAULT_SOURCE
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<BR> || /* Glibc versions <= 2.19: */ _SVID_SOURCE || _BSD_SOURCE
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</DL>
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<P>
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<B>fgets_unlocked</B>(),
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<B>fputs_unlocked</B>(),
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<B>getwc_unlocked</B>(),
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<B>getwchar_unlocked</B>(),
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<B>fgetwc_unlocked</B>(),
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<B>fputwc_unlocked</B>(),
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<B>putwchar_unlocked</B>(),
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<B>fgetws_unlocked</B>(),
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<B>fputws_unlocked</B>():
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<DL COMPACT><DT id="3"><DD>
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_GNU_SOURCE
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</DL>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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Each of these functions has the same behavior as its counterpart
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without the "_unlocked" suffix, except that they do not use locking
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(they do not set locks themselves, and do not test for the presence
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of locks set by others) and hence are thread-unsafe.
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See
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<B><A HREF="/cgi-bin/man/man2html?3+flockfile">flockfile</A></B>(3).
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<A NAME="lbAE"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>getc_unlocked</B>(),
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<B>putc_unlocked</B>(),
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<B>clearerr_unlocked</B>(),
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<B>fflush_unlocked</B>(),
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<B>fgetc_unlocked</B>(),
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<B>fputc_unlocked</B>(),
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<B>fread_unlocked</B>(),
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<B>fwrite_unlocked</B>(),
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<B>fgets_unlocked</B>(),
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<B>fputs_unlocked</B>(),
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<B>getwc_unlocked</B>(),
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<B>fgetwc_unlocked</B>(),
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<B>fputwc_unlocked</B>(),
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<B>putwc_unlocked</B>(),
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<B>fgetws_unlocked</B>(),
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<B>fputws_unlocked</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe race:stream<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>getchar_unlocked</B>(),
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<B>getwchar_unlocked</B>()
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</TD><TD>Thread safety</TD><TD>MT-Unsafe race:stdin<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>putchar_unlocked</B>(),
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<B>putwchar_unlocked</B>()
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</TD><TD>Thread safety</TD><TD>MT-Unsafe race:stdout<BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>feof_unlocked</B>(),
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<B>ferror_unlocked</B>(),
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<B>fileno_unlocked</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<A NAME="lbAF"> </A>
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<H2>CONFORMING TO</H2>
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The four functions
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<B>getc_unlocked</B>(),
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<B>getchar_unlocked</B>(),
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<B>putc_unlocked</B>(),
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<B>putchar_unlocked</B>()
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are in POSIX.1-2001 and POSIX.1-2008.
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<P>
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The nonstandard
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<B>*_unlocked</B>()
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variants occur on a few UNIX systems, and are available in recent glibc.
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They should probably not be used.
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<A NAME="lbAG"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+flockfile">flockfile</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+stdio">stdio</A></B>(3)
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<A NAME="lbAH"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="4"><A HREF="#lbAB">NAME</A><DD>
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<DT id="5"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="6"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="7"><A HREF="#lbAE">ATTRIBUTES</A><DD>
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<DT id="8"><A HREF="#lbAF">CONFORMING TO</A><DD>
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<DT id="9"><A HREF="#lbAG">SEE ALSO</A><DD>
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<DT id="10"><A HREF="#lbAH">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:59 GMT, March 31, 2021
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</BODY>
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</HTML>
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