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