| 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 | * advertising materials, and 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 | <<getc_unlocked>>---non-thread-safe version of getc (macro) |
|---|
| 21 | |
|---|
| 22 | INDEX |
|---|
| 23 | getc_unlocked |
|---|
| 24 | INDEX |
|---|
| 25 | _getc_unlocked_r |
|---|
| 26 | |
|---|
| 27 | SYNOPSIS |
|---|
| 28 | #include <stdio.h> |
|---|
| 29 | int getc_unlocked(FILE *<[fp]>); |
|---|
| 30 | |
|---|
| 31 | #include <stdio.h> |
|---|
| 32 | int _getc_unlocked_r(FILE *<[fp]>); |
|---|
| 33 | |
|---|
| 34 | DESCRIPTION |
|---|
| 35 | <<getc_unlocked>> is a non-thread-safe version of <<getc>> declared in |
|---|
| 36 | <<stdio.h>>. <<getc_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 | <<getc_unlocked>> is equivalent to <<getc>>. |
|---|
| 43 | |
|---|
| 44 | The <<_getc_unlocked_r>> function is simply the reentrant version of |
|---|
| 45 | <<get_unlocked>> which passes an additional reentrancy structure pointer |
|---|
| 46 | argument: <[ptr]>. |
|---|
| 47 | |
|---|
| 48 | RETURNS |
|---|
| 49 | See <<getc>>. |
|---|
| 50 | |
|---|
| 51 | PORTABILITY |
|---|
| 52 | POSIX 1003.1 requires <<getc_unlocked>>. <<getc_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 | #if defined(LIBC_SCCS) && !defined(lint) |
|---|
| 59 | static char sccsid[] = "%W% (Berkeley) %G%"; |
|---|
| 60 | #endif /* LIBC_SCCS and not lint */ |
|---|
| 61 | |
|---|
| 62 | #include <_ansi.h> |
|---|
| 63 | #include <stdio.h> |
|---|
| 64 | |
|---|
| 65 | /* |
|---|
| 66 | * A subroutine version of the macro getc_unlocked. |
|---|
| 67 | */ |
|---|
| 68 | |
|---|
| 69 | #undef getc_unlocked |
|---|
| 70 | |
|---|
| 71 | int |
|---|
| 72 | _getc_unlocked_r (struct _reent *ptr, |
|---|
| 73 | register FILE *fp) |
|---|
| 74 | { |
|---|
| 75 | /* CHECK_INIT is called (eventually) by __srefill_r. */ |
|---|
| 76 | |
|---|
| 77 | return __sgetc_r (ptr, fp); |
|---|
| 78 | } |
|---|
| 79 | |
|---|
| 80 | #ifndef _REENT_ONLY |
|---|
| 81 | |
|---|
| 82 | int |
|---|
| 83 | getc_unlocked (register FILE *fp) |
|---|
| 84 | { |
|---|
| 85 | return __sgetc_r (_REENT, fp); |
|---|
| 86 | } |
|---|
| 87 | |
|---|
| 88 | #endif /* !_REENT_ONLY */ |
|---|
