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2006-03-07 Eric Blake <ebb9@byu.net>

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* libc/stdio/freopen.c (_freopen_r) [HAVE_FCNTL]: For NULL
        filename, allow read-only or write-only FILE atop O_RDWR file
        descriptor.
        * libc/stdio64/freopen64.c (_freopen64_r) [HAVE_FCNTL]: Likewise.
This commit is contained in:
Jeff Johnston 2006-03-07 22:20:18 +00:00
parent ddf12e6b76
commit ce10f1789e
3 changed files with 25 additions and 14 deletions
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7
newlib/ChangeLog
View File

@ -1,3 +1,10 @@
2006-03-07 Eric Blake <ebb9@byu.net>
* libc/stdio/freopen.c (_freopen_r) [HAVE_FCNTL]: For NULL
filename, allow read-only or write-only FILE atop O_RDWR file
descriptor.
* libc/stdio64/freopen64.c (_freopen64_r) [HAVE_FCNTL]: Likewise.
2006-03-07 Jeff Johnston <jjohnstn@redhat.com>
* libm/common/sf_isinf.c[_DOUBLE_IS_32BITS]: Undef isinf.

16
newlib/libc/stdio/freopen.c
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@ -56,10 +56,10 @@ it).
<[file]> and <[mode]> are used just as in <<fopen>>.
If <[file]> is <<NULL>>, the underlying stream is modified rather than
closed. The file cannot change access mode (for example, if it was
previously read-only, <[mode]> must be "r", "rb", or "rt"), but can
change status such as append or binary mode. If modification is not
possible, failure occurs.
closed. The file cannot be given a more permissive access mode (for
example, a <[mode]> of "w" will fail on a read-only file descriptor),
but can change status such as append or binary mode. If modification
is not possible, failure occurs.
RETURNS
If successful, the result is the same as the argument <[fp]>. If the
@ -148,12 +148,14 @@ _DEFUN(_freopen_r, (ptr, file, mode, fp),
#ifdef HAVE_FCNTL
int oldflags;
/*
* Reuse the file descriptor, but only if the access mode is
* unchanged. F_SETFL correctly ignores creation flags.
* Reuse the file descriptor, but only if the new access mode is
* equal or less permissive than the old. F_SETFL correctly
* ignores creation flags.
*/
f = fp->_file;
if ((oldflags = _fcntl_r (ptr, f, F_GETFL, 0)) == -1
|| ((oldflags ^ oflags) & O_ACCMODE) != 0
|| ! ((oldflags & O_ACCMODE) == O_RDWR
|| ((oldflags ^ oflags) & O_ACCMODE) == 0)
|| _fcntl_r (ptr, f, F_SETFL, oflags) == -1)
f = -1;
#else

16
newlib/libc/stdio64/freopen64.c
View File

@ -56,10 +56,10 @@ it).
<[file]> and <[mode]> are used just as in <<fopen>>.
If <[file]> is <<NULL>>, the underlying stream is modified rather than
closed. The file cannot change access mode (for example, if it was
previously read-only, <[mode]> must be "r", "rb", or "rt"), but can
change status such as append or binary mode. If modification is not
possible, failure occurs.
closed. The file cannot be given a more permissive access mode (for
example, a <[mode]> of "w" will fail on a read-only file descriptor),
but can change status such as append or binary mode. If modification
is not possible, failure occurs.
RETURNS
If successful, the result is the same as the argument <[fp]>. If the
@ -148,12 +148,14 @@ _DEFUN (_freopen64_r, (ptr, file, mode, fp),
#ifdef HAVE_FCNTL
int oldflags;
/*
* Reuse the file descriptor, but only if the access mode is
* unchanged. F_SETFL correctly ignores creation flags.
* Reuse the file descriptor, but only if the new access mode is
* equal or less permissive than the old. F_SETFL correctly
* ignores creation flags.
*/
f = fp->_file;
if ((oldflags = _fcntl_r (ptr, f, F_GETFL, 0)) == -1
|| ((oldflags ^ oflags) & O_ACCMODE) != 0
|| ! ((oldflags & O_ACCMODE) == O_RDWR
|| ((oldflags ^ oflags) & O_ACCMODE) == 0)
|| _fcntl_r (ptr, f, F_SETFL, oflags) == -1)
f = -1;
#else