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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/ape/lib/ap/plan9/open.c – Rev 2

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#include <errno.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include "lib.h"
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#include <sys/stat.h>
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#include "sys9.h"
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/*
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 * O_NOCTTY has no effect
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 */
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int
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open(const char *path, int flags, ...)
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{
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	int n;
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	long f;
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	int mode;
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	Fdinfo *fi;
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	va_list va;
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	f = flags&O_ACCMODE;
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	if(flags&O_CREAT){
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		if(access(path, 0) >= 0){
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			if(flags&O_EXCL){
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				errno = EEXIST;
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				return -1;
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			}else{
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				if((flags&O_TRUNC)&&(flags&(O_RDWR|O_WRONLY)))
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					f |= 16;
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				n = _OPEN(path, f);
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			}
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		}else{
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			va_start(va, flags);
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			mode = va_arg(va, int);
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			va_end(va);
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			n = _CREATE(path, f, mode&0777);
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		}
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		if(n < 0)
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			_syserrno();
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	}else{
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		if((flags&O_TRUNC)&&(flags&(O_RDWR|O_WRONLY)))
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			f |= 16;
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		n = _OPEN(path, f);
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		if(n < 0)
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			_syserrno();
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	}
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	if(n >= 0){
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		fi = &_fdinfo[n];
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		fi->flags = FD_ISOPEN;
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		fi->oflags = flags&(O_ACCMODE|O_NONBLOCK|O_APPEND);
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		fi->uid = -2;
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		fi->gid = -2;
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		fi->name = malloc(strlen(path)+1);
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		if(fi->name)
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			strcpy(fi->name, path);
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		if(fi->oflags&O_APPEND)
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			_SEEK(n, 0, 2);
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	}
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	return n;
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}