PUTC(3) BSD Library Functions Manual PUTC(3)
fputc, putc, putchar, putc_unlocked, putchar_unlocked, putw -- output a character or word to
Standard C Library (libc, -lc)
fputc(int c, FILE *stream);
putc(int c, FILE *stream);
putc_unlocked(int c, FILE *stream);
putw(int w, FILE *stream);
The fputc() function writes the character c (converted to an ``unsigned char'') to the out-
put 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 functionality 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.
The functions, fputc(), putc() and putchar() 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.
ferror(3), fopen(3), getc(3), stdio(3)
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
The functions putc(), putchar(), and putw() first appeared in Version 6 AT&T UNIX. The
function fputc() appeared in Version 7 AT&T UNIX.
The size and byte order of an int varies from one machine to another, and putw() is not rec-
ommended for portable applications.
BSD May 6, 2010 BSD