1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2010 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #include "sfhdr.h" 23 24 /* Close a stream. A file stream is synced before closing. 25 ** 26 ** Written by Kiem-Phong Vo 27 */ 28 29 #if __STD_C 30 int sfclose(Sfio_t* f) 31 #else 32 int sfclose(f) 33 Sfio_t* f; 34 #endif 35 { 36 reg int local, ex, rv; 37 Void_t* data = NIL(Void_t*); 38 SFMTXDECL(f); 39 40 SFMTXENTER(f, -1); 41 42 GETLOCAL(f,local); 43 44 if(!(f->mode&SF_INIT) && 45 SFMODE(f,local) != (f->mode&SF_RDWR) && 46 SFMODE(f,local) != (f->mode&(SF_READ|SF_SYNCED)) && 47 _sfmode(f,SF_SYNCED,local) < 0) 48 SFMTXRETURN(f,-1); 49 50 /* closing a stack of streams */ 51 while(f->push) 52 { reg Sfio_t* pop; 53 54 if(!(pop = (*_Sfstack)(f,NIL(Sfio_t*))) ) 55 SFMTXRETURN(f,-1); 56 57 if(sfclose(pop) < 0) 58 { (*_Sfstack)(f,pop); 59 SFMTXRETURN(f,-1); 60 } 61 } 62 63 rv = 0; 64 if(f->disc == _Sfudisc) /* closing the ungetc stream */ 65 f->disc = NIL(Sfdisc_t*); 66 else if(f->file >= 0) /* sync file pointer */ 67 { f->bits |= SF_ENDING; 68 rv = sfsync(f); 69 } 70 71 SFLOCK(f,0); 72 73 /* raise discipline exceptions */ 74 if(f->disc && (ex = SFRAISE(f,local ? SF_NEW : SF_CLOSING,NIL(Void_t*))) != 0) 75 SFMTXRETURN(f,ex); 76 77 if(!local && f->pool) 78 { /* remove from pool */ 79 if(f->pool == &_Sfpool) 80 { reg int n; 81 82 POOLMTXLOCK(&_Sfpool); 83 for(n = 0; n < _Sfpool.n_sf; ++n) 84 { if(_Sfpool.sf[n] != f) 85 continue; 86 /* found it */ 87 _Sfpool.n_sf -= 1; 88 for(; n < _Sfpool.n_sf; ++n) 89 _Sfpool.sf[n] = _Sfpool.sf[n+1]; 90 break; 91 } 92 POOLMTXUNLOCK(&_Sfpool); 93 } 94 else 95 { f->mode &= ~SF_LOCK; /**/ASSERT(_Sfpmove); 96 if((*_Sfpmove)(f,-1) < 0) 97 { SFOPEN(f,0); 98 SFMTXRETURN(f,-1); 99 } 100 f->mode |= SF_LOCK; 101 } 102 f->pool = NIL(Sfpool_t*); 103 } 104 105 if(f->data && (!local || (f->flags&SF_STRING) || (f->bits&SF_MMAP) ) ) 106 { /* free buffer */ 107 #ifdef MAP_TYPE 108 if(f->bits&SF_MMAP) 109 SFMUNMAP(f,f->data,f->endb-f->data); 110 else 111 #endif 112 if(f->flags&SF_MALLOC) 113 data = (Void_t*)f->data; 114 115 f->data = NIL(uchar*); 116 f->size = -1; 117 } 118 119 /* zap the file descriptor */ 120 if(_Sfnotify) 121 (*_Sfnotify)(f, SF_CLOSING, (void*)((long)f->file)); 122 if(f->file >= 0 && !(f->flags&SF_STRING)) 123 CLOSE(f->file); 124 f->file = -1; 125 126 SFKILL(f); 127 f->flags &= SF_STATIC; 128 f->here = 0; 129 f->extent = -1; 130 f->endb = f->endr = f->endw = f->next = f->data; 131 132 /* zap any associated auxiliary buffer */ 133 if(f->rsrv) 134 { free(f->rsrv); 135 f->rsrv = NIL(Sfrsrv_t*); 136 } 137 138 /* delete any associated sfpopen-data */ 139 if(f->proc) 140 rv = _sfpclose(f); 141 142 /* destroy the mutex */ 143 if(f->mutex) 144 { (void)vtmtxclrlock(f->mutex); 145 if(f != sfstdin && f != sfstdout && f != sfstderr) 146 { (void)vtmtxclose(f->mutex); 147 f->mutex = NIL(Vtmutex_t*); 148 } 149 } 150 151 if(!local) 152 { if(f->disc && (ex = SFRAISE(f,SF_FINAL,NIL(Void_t*))) != 0 ) 153 { rv = ex; 154 goto done; 155 } 156 157 if(!(f->flags&SF_STATIC) ) 158 free(f); 159 else 160 { f->disc = NIL(Sfdisc_t*); 161 f->stdio = NIL(Void_t*); 162 f->mode = SF_AVAIL; 163 } 164 } 165 166 done: 167 if(data) 168 free(data); 169 return rv; 170 } 171