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Set stream errors in more cases

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Also avoid unnecessarily setting errno when testing for TTY.
This commit is contained in:
Ulrich Drepper
2011-05-21 00:42:06 -04:00
parent 34a9094f49
commit aec84f5395
5 changed files with 33 additions and 6 deletions
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17
libio/filedoalloc.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1993, 1997, 2001, 2002 Free Software Foundation, Inc.
/* Copyright (C) 1993, 1997, 2001, 2002, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -41,7 +41,7 @@
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@ -74,6 +74,17 @@
# include <device-nrs.h>
#endif
static int
local_isatty (int fd)
{
int save_errno = errno;
int res = isatty (fd);
__set_errno (save_errno);
return res;
}
/*
* Allocate a file buffer, or switch to unbuffered I/O.
* Per the ANSI C standard, ALL tty devices default to line buffered.
@ -109,7 +120,7 @@ _IO_file_doallocate (fp)
#ifdef DEV_TTY_P
DEV_TTY_P (&st) ||
#endif
isatty (fp->_fileno))
local_isatty (fp->_fileno))
fp->_flags |= _IO_LINE_BUF;
}
#if _IO_HAVE_ST_BLKSIZE