1 /*
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * and/or other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Berkeley. The name of the
11 * University may not be used to endorse or promote products derived
12 * from this software without specific prior written permission.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
16 */
17
18 /*
19 FUNCTION
20 <<putc_unlocked>>---non-thread-safe version of putc (macro)
21
22 INDEX
23 putc_unlocked
24 INDEX
25 _putc_unlocked_r
26
27 SYNOPSIS
28 #include <stdio.h>
29 int putc_unlocked(int <[ch]>, FILE *<[fp]>);
30
31 #include <stdio.h>
32 int putc_unlocked( int <[ch]>, FILE *<[fp]>);
33
34 DESCRIPTION
35 <<putc_unlocked>> is a non-thread-safe version of <<putc>> declared in
36 <<stdio.h>>. <<putc_unlocked>> may only safely be used within a scope
37 protected by flockfile() (or ftrylockfile()) and funlockfile(). These
38 functions may safely be used in a multi-threaded program if and only
39 if they are called while the invoking thread owns the ( FILE *)
40 object, as is the case after a successful call to the flockfile() or
41 ftrylockfile() functions. If threads are disabled, then
42 <<putc_unlocked>> is equivalent to <<putc>>.
43
44 The function <<_putc_unlocked_r>> is simply the reentrant version of
45 <<putc_unlocked>> that takes an additional reentrant structure pointer
46 argument: <[ptr]>.
47
48 RETURNS
49 See <<putc>>.
50
51 PORTABILITY
52 POSIX 1003.1 requires <<putc_unlocked>>. <<putc_unlocked>> may be
53 implemented as a macro, so arguments should not have side-effects.
54
55 Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
56 <<lseek>>, <<read>>, <<sbrk>>, <<write>>.
57 */
58
59 #if defined(LIBC_SCCS) && !defined(lint)
60 static char sccsid[] = "%W% (Berkeley) %G%";
61 #endif /* LIBC_SCCS and not lint */
62
63 #define _DEFAULT_SOURCE
64 #include <_ansi.h>
65 #include <stdio.h>
66
67 /*
68 * A subroutine version of the macro putc_unlocked.
69 */
70
71 #undef putc_unlocked
72
73 int
putc_unlocked(int c,register FILE * fp)74 putc_unlocked (
75 int c,
76 register FILE *fp)
77 {
78 /* CHECK_INIT is (eventually) called by __swbuf. */
79
80 return _sputc ( c, fp);
81 }
82
