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PUTC(3)                                 BSD Library Functions Manual                                 PUTC(3)

NAME
     fputc, putc, putc_unlocked, putchar, 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
     putc_unlocked(int c, FILE *stream);

     int
     putchar(int c);

     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.

     The putc() macro 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.

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

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

     The putc_unlocked() and putchar_unlocked() functions are equivalent to putc() and putchar() respec-tively, respectively,
     tively, except that the caller is responsible for locking the stream with flockfile(3) before calling
     them.  These functions may be used to avoid the overhead of locking the stream for each character, and
     to avoid output being interspersed from multiple threads writing to the same stream.

RETURN VALUES
     The functions, fputc(), putc(), putchar(), putc_unlocked(), and putchar_unlocked() return the character
     written.  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), putwc(3), stdio(3)

STANDARDS
     The functions fputc(), putc(), and putchar(), conform to ISO/IEC 9899:1990 (``ISO C90'').  The
     putc_unlocked() and putchar_unlocked() functions conform to IEEE Std 1003.1-2001 (``POSIX.1'').  A
     function putw() function appeared in Version 6 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.

BSD                                           January 10, 2003                                           BSD