UNLOCKEDSTDIO(3) Linux Programmer's Manual UNLOCKEDSTDIO(3)

NAME
       getcunlocked, getcharunlocked, putcunlocked, putcharunlocked - non‐
       locking stdio functions

SYNOPSIS
       #include 

       int getcunlocked(FILE *stream);
       int getcharunlocked(void);
       int putcunlocked(int c, FILE *stream);
       int putcharunlocked(int c);

       void clearerrunlocked(FILE *stream);
       int feofunlocked(FILE *stream);
       int ferrorunlocked(FILE *stream);
       int filenounlocked(FILE *stream);
       int fflushunlocked(FILE *stream);
       int fgetcunlocked(FILE *stream);
       int fputcunlocked(int c, FILE *stream);
       sizet freadunlocked(void *ptr, sizet size, sizet n,
                             FILE *stream);
       sizet fwriteunlocked(const void *ptr, sizet size, sizet n,
                             FILE *stream);

       char *fgetsunlocked(char *s, int n, FILE *stream);
       int fputsunlocked(const char *s, FILE *stream);

       #include 

       wintt getwcunlocked(FILE *stream);
       wintt getwcharunlocked(void);
       wintt fgetwcunlocked(FILE *stream);
       wintt fputwcunlocked(wchart wc, FILE *stream);
       wintt putwcunlocked(wchart wc, FILE *stream);
       wintt putwcharunlocked(wchart wc);
       wchart *fgetwsunlocked(wchart *ws, int n, FILE *stream);
       int fputwsunlocked(const wchart *ws, FILE *stream);

   Feature Test Macro Requirements for glibc (see featuretestmacros(7)):

       getcunlocked(), getcharunlocked(), putcunlocked(),
       putcharunlocked():
           POSIXCSOURCE >= 1 || XOPENSOURCE || POSIXSOURCE ||
           BSDSOURCE || SVIDSOURCE

       clearerrunlocked(), feofunlocked(), ferrorunlocked(),
       filenounlocked(), fflushunlocked(), fgetcunlocked(),
       fputcunlocked(), freadunlocked(), fwriteunlocked():
           BSDSOURCE || SVIDSOURCE

       fgetsunlocked(), fputsunlocked(), getwcunlocked(),
       getwcharunlocked(), fgetwcunlocked(), fputwcunlocked(),
       putwcharunlocked(), fgetwsunlocked(), fputwsunlocked():
           GNUSOURCE

DESCRIPTION
       Each of these functions has the same behavior as its counterpart  with‐
       out  the  "unlocked" suffix, except that they do not use locking (they
       do not set locks themselves, and do not test for the presence of  locks
       set by others) and hence are thread-unsafe.  See flockfile(3).

CONFORMING TO
       The     four     functions     getcunlocked(),     getcharunlocked(),
       putcunlocked(), putcharunlocked() are in POSIX.1-2001.

       The nonstandard *unlocked() variants occur on a few UNIX systems,  and
       are available in recent glibc.  They should probably not be used.

SEE ALSO
       flockfile(3), stdio(3)

COLOPHON
       This  page  is  part of release 3.53 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



                                  2008-08-29                 UNLOCKEDSTDIO(3)