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PUTC(3) NetBSD Library Functions Manual PUTC(3)
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Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
fputc, putc, putchar, putc_unlocked, putchar_unlocked, putw -- output a
character or word to a stream
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 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
The putw() function writes the specified int to the named output stream.
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.
ferror(3), flockfile(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 (``POSIX.1'').
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.
The size and byte order of an int varies from one machine to another, and
putw() is not recommended for portable applications.
NetBSD 10.99 September 2, 2019 NetBSD 10.99