Lock the stream before calling __sfileno() to retrieve the file descriptor.
1003.1-2001 requires that fileno() behave as if it locks the stream.
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=109155
@ -40,7 +40,10 @@ static char sccsid[] = "@(#)fileno.c 8.1 (Berkeley) 6/4/93";
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <stdio.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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/*
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* fileno has traditionally been a macro in <stdio.h>. That is
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@ -51,6 +54,11 @@ __FBSDID("$FreeBSD$");
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int
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fileno(FILE *fp)
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{
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/* ??? - Should probably use atomic_read. */
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return (__sfileno(fp));
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int fd;
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FLOCKFILE(fp);
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fd = __sfileno(fp);
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FUNLOCKFILE(fp);
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return (fd);
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}
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