85 lines
3 KiB
C
85 lines
3 KiB
C
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/* Set the error indicator of a stream.
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Copyright (C) 2007-2018 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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/* Specification. */
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#include "fseterr.h"
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#include <errno.h>
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#include "stdio-impl.h"
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/* This file is not used on systems that have the __fseterr function,
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namely musl libc. */
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void
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fseterr (FILE *fp)
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{
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/* Most systems provide FILE as a struct and the necessary bitmask in
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<stdio.h>, because they need it for implementing getc() and putc() as
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fast macros. */
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#if defined _IO_EOF_SEEN || defined _IO_ftrylockfile || __GNU_LIBRARY__ == 1
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/* GNU libc, BeOS, Haiku, Linux libc5 */
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fp->_flags |= _IO_ERR_SEEN;
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#elif defined __sferror || defined __DragonFly__ || defined __ANDROID__
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/* FreeBSD, NetBSD, OpenBSD, DragonFly, Mac OS X, Cygwin, Minix 3, Android */
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fp_->_flags |= __SERR;
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#elif defined __EMX__ /* emx+gcc */
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fp->_flags |= _IOERR;
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#elif defined __minix /* Minix */
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fp->_flags |= _IOERR;
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#elif defined _IOERR /* AIX, HP-UX, IRIX, OSF/1, Solaris, OpenServer, mingw, MSVC, NonStop Kernel, OpenVMS */
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fp_->_flag |= _IOERR;
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#elif defined __UCLIBC__ /* uClibc */
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fp->__modeflags |= __FLAG_ERROR;
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#elif defined __QNX__ /* QNX */
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fp->_Mode |= 0x200 /* _MERR */;
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#elif defined __MINT__ /* Atari FreeMiNT */
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fp->__error = 1;
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#elif defined EPLAN9 /* Plan9 */
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if (fp->state != 0 /* CLOSED */)
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fp->state = 5 /* ERR */;
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#elif 0 /* unknown */
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/* Portable fallback, based on an idea by Rich Felker.
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Wow! 6 system calls for something that is just a bit operation!
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Not activated on any system, because there is no way to repair FP when
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the sequence of system calls fails, and library code should not call
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abort(). */
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int saved_errno;
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int fd;
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int fd2;
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saved_errno = errno;
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fflush (fp);
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fd = fileno (fp);
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fd2 = dup (fd);
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if (fd2 >= 0)
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{
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close (fd);
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fputc ('\0', fp); /* This should set the error indicator. */
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fflush (fp); /* Or this. */
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if (dup2 (fd2, fd) < 0)
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/* Whee... we botched the stream and now cannot restore it! */
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abort ();
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close (fd2);
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}
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errno = saved_errno;
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#else
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#error "Please port gnulib fseterr.c to your platform! Look at the definitions of ferror and clearerr on your system, then report this to bug-gnulib."
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#endif
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}
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