putchar_unlocked(3) - NetBSD Manual Pages

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PUTC(3)                 NetBSD Library Functions Manual                PUTC(3)


NAME

     fputc, putc, putchar, putc_unlocked, putchar_unlocked, putw -- output a
     character or word to a stream


LIBRARY

     Standard C Library (libc, -lc)


SYNOPSIS

     #include <stdio.h>

     int
     fputc(int c, FILE *stream);

     int
     putc(int c, FILE *stream);

     int
     putchar(int c);

     int
     putc_unlocked(int c, FILE *stream);

     int
     putchar_unlocked(int c);

     int
     putw(int w, FILE *stream);


DESCRIPTION

     The fputc() function writes the character c (converted to an ``unsigned
     char'') to the output stream pointed to by stream.

     putc() acts essentially identically to fputc(), but is a macro that
     expands in-line.  It may evaluate stream more than once, so arguments
     given to putc() should not be expressions with potential side effects.

     putchar() is identical to putc() with an output stream of stdout.

     The putc_unlocked() and putchar_unlocked() functions provide functional-
     ity identical to that of putc() and putchar(), respectively, but do not
     perform implicit locking of the streams they operate on.  In multi-
     threaded programs they may be used only within a scope in which the
     stream has been successfully locked by the calling thread using either
     flockfile(3) or ftrylockfile(3), and may later be released using
     funlockfile(3).

     The putw() function writes the specified int to the named output stream.


RETURN VALUES

     The functions, fputc(), putc() and putchar() return the character writ-
     ten.  If an error occurs, the value EOF is returned.  The putw() function
     returns 0 on success; EOF is returned if a write error occurs, or if an
     attempt is made to write a read-only stream.


SEE ALSO

     ferror(3), flockfile(3), fopen(3), getc(3), stdio(3)


STANDARDS

     The functions fputc(), putc(), and putchar(), conform to ANSI X3.159-1989
     (``ANSI C89'').  The functions putc_unlocked() and putchar_unlocked()
     conform to ISO/IEC 9945-1:1996 (``POSIX.1'').


HISTORY

     The putc(), and putw() functions first appeared in Version 1 AT&T UNIX.
     The putchar() function first appeared in Version 4 AT&T UNIX.  The func-
     tion fputc() appeared in Version 7 AT&T UNIX.


BUGS

     The size and byte order of an int varies from one machine to another, and
     putw() is not recommended for portable applications.

NetBSD 10.1                    September 2, 2019                   NetBSD 10.1