47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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/*
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* Posix stdio -- fdopen
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*/
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#include "iolib.h"
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/*
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* Open the named file with the given mode, using the given FILE
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* Legal modes are given below, `additional characters may follow these sequences':
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* r rb open to read
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* w wb open to write, truncating
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* a ab open to write positioned at eof, creating if non-existant
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* r+ r+b rb+ open to read and write, creating if non-existant
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* w+ w+b wb+ open to read and write, truncating
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* a+ a+b ab+ open to read and write, positioned at eof, creating if non-existant.
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*/
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FILE *fdopen(const int fd, const char *mode){
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FILE *f;
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qlock(&_stdiolk);
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for(f=_IO_stream;f!=&_IO_stream[FOPEN_MAX];f++)
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if(f->state==CLOSED)
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break;
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if(f==&_IO_stream[FOPEN_MAX]) {
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qunlock(&_stdiolk);
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return NULL;
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}
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f->fd=fd;
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if(mode[0]=='a')
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sys_seek(f->fd, 0L, 2);
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if(f->fd==-1) return NULL;
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f->flags=0;
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f->state=OPEN;
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f->buf=0;
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f->rp=0;
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f->wp=0;
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f->lp=0;
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qunlock(&_stdiolk);
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return f;
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}
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