[444] | 1 | /* |
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| 2 | * Copyright (c) 1990 The Regents of the University of California. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms are permitted |
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| 6 | * provided that the above copyright notice and this paragraph are |
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| 7 | * duplicated in all such forms and that any documentation, |
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| 8 | * advertising materials, and other materials related to such |
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| 9 | * distribution and use acknowledge that the software was developed |
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| 10 | * by the University of California, Berkeley. The name of the |
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| 11 | * University may not be used to endorse or promote products derived |
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| 12 | * from this software without specific prior written permission. |
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| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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| 15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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| 16 | */ |
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| 17 | |
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| 18 | /* |
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| 19 | FUNCTION |
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| 20 | <<fclose>>---close a file |
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| 21 | |
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| 22 | INDEX |
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| 23 | fclose |
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| 24 | INDEX |
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| 25 | _fclose_r |
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| 26 | |
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| 27 | SYNOPSIS |
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| 28 | #include <stdio.h> |
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| 29 | int fclose(FILE *<[fp]>); |
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| 30 | int _fclose_r(struct _reent *<[reent]>, FILE *<[fp]>); |
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| 31 | |
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| 32 | DESCRIPTION |
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| 33 | If the file or stream identified by <[fp]> is open, <<fclose>> closes |
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| 34 | it, after first ensuring that any pending data is written (by calling |
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| 35 | <<fflush(<[fp]>)>>). |
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| 36 | |
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| 37 | The alternate function <<_fclose_r>> is a reentrant version. |
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| 38 | The extra argument <[reent]> is a pointer to a reentrancy structure. |
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| 39 | |
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| 40 | RETURNS |
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| 41 | <<fclose>> returns <<0>> if successful (including when <[fp]> is |
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| 42 | <<NULL>> or not an open file); otherwise, it returns <<EOF>>. |
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| 43 | |
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| 44 | PORTABILITY |
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| 45 | <<fclose>> is required by ANSI C. |
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| 46 | |
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| 47 | Required OS subroutines: <<close>>, <<fstat>>, <<isatty>>, <<lseek>>, |
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| 48 | <<read>>, <<sbrk>>, <<write>>. |
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| 49 | */ |
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| 50 | |
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| 51 | #include <_ansi.h> |
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| 52 | #include <reent.h> |
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| 53 | #include <stdio.h> |
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| 54 | #include <stdlib.h> |
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| 55 | #include <sys/lock.h> |
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| 56 | #include "local.h" |
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| 57 | |
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| 58 | int |
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| 59 | _fclose_r (struct _reent *rptr, |
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| 60 | register FILE * fp) |
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| 61 | { |
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| 62 | int r; |
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| 63 | |
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| 64 | if (fp == NULL) |
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| 65 | return (0); /* on NULL */ |
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| 66 | |
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| 67 | CHECK_INIT (rptr, fp); |
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| 68 | |
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| 69 | /* We can't use the _newlib_flockfile_XXX macros here due to the |
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| 70 | interlocked locking with the sfp_lock. */ |
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| 71 | #ifdef _STDIO_WITH_THREAD_CANCELLATION_SUPPORT |
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| 72 | int __oldcancel; |
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| 73 | pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &__oldcancel); |
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| 74 | #endif |
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| 75 | if (!(fp->_flags2 & __SNLK)) |
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| 76 | _flockfile (fp); |
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| 77 | |
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| 78 | if (fp->_flags == 0) /* not open! */ |
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| 79 | { |
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| 80 | if (!(fp->_flags2 & __SNLK)) |
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| 81 | _funlockfile (fp); |
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| 82 | #ifdef _STDIO_WITH_THREAD_CANCELLATION_SUPPORT |
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| 83 | pthread_setcancelstate (__oldcancel, &__oldcancel); |
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| 84 | #endif |
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| 85 | return (0); |
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| 86 | } |
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| 87 | #ifdef _STDIO_BSD_SEMANTICS |
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| 88 | /* BSD and Glibc systems only flush streams which have been written to. */ |
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| 89 | r = (fp->_flags & __SWR) ? __sflush_r (rptr, fp) : 0; |
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| 90 | #else |
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| 91 | /* Follow POSIX semantics exactly. Unconditionally flush to allow |
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| 92 | special handling for seekable read files to reposition file to last |
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| 93 | byte processed as opposed to last byte read ahead into the buffer. */ |
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| 94 | r = __sflush_r (rptr, fp); |
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| 95 | #endif |
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| 96 | if (fp->_close != NULL && fp->_close (rptr, fp->_cookie) < 0) |
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| 97 | r = EOF; |
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| 98 | if (fp->_flags & __SMBF) |
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| 99 | _free_r (rptr, (char *) fp->_bf._base); |
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| 100 | if (HASUB (fp)) |
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| 101 | FREEUB (rptr, fp); |
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| 102 | if (HASLB (fp)) |
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| 103 | FREELB (rptr, fp); |
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| 104 | __sfp_lock_acquire (); |
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| 105 | fp->_flags = 0; /* release this FILE for reuse */ |
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| 106 | if (!(fp->_flags2 & __SNLK)) |
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| 107 | _funlockfile (fp); |
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| 108 | #ifndef __SINGLE_THREAD__ |
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| 109 | __lock_close_recursive (fp->_lock); |
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| 110 | #endif |
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| 111 | |
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| 112 | __sfp_lock_release (); |
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| 113 | #ifdef _STDIO_WITH_THREAD_CANCELLATION_SUPPORT |
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| 114 | pthread_setcancelstate (__oldcancel, &__oldcancel); |
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| 115 | #endif |
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| 116 | |
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| 117 | return (r); |
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| 118 | } |
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| 119 | |
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| 120 | #ifndef _REENT_ONLY |
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| 121 | |
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| 122 | int |
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| 123 | fclose (register FILE * fp) |
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| 124 | { |
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| 125 | return _fclose_r(_REENT, fp); |
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| 126 | } |
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| 127 | |
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| 128 | #endif |
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