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/* Copyright (C) 1993-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include <stdlib.h>
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#include "libioP.h"
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#include <fcntl.h>
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#include <shlib-compat.h>
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FILE *
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_IO_new_fdopen (int fd, const char *mode)
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{
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int read_write;
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struct locked_FILE
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{
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struct _IO_FILE_plus fp;
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#ifdef _IO_MTSAFE_IO
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_IO_lock_t lock;
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#endif
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struct _IO_wide_data wd;
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} *new_f;
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int i;
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int use_mmap = 0;
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/* Decide whether we modify the offset of the file we attach to and seek to
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the end of file. We only do this if the mode is 'a' and if the file
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descriptor did not have O_APPEND in its flags already. */
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bool do_seek = false;
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switch (*mode)
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{
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case 'r':
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read_write = _IO_NO_WRITES;
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break;
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case 'w':
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read_write = _IO_NO_READS;
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break;
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case 'a':
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read_write = _IO_NO_READS|_IO_IS_APPENDING;
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break;
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default:
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__set_errno (EINVAL);
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return NULL;
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}
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for (i = 1; i < 5; ++i)
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{
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switch (*++mode)
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{
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case '\0':
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break;
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case '+':
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read_write &= _IO_IS_APPENDING;
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break;
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case 'm':
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use_mmap = 1;
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continue;
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case 'x':
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case 'b':
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default:
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/* Ignore */
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continue;
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}
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break;
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}
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int fd_flags = __fcntl (fd, F_GETFL);
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if (fd_flags == -1)
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return NULL;
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if (((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES))
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|| ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS)))
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{
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__set_errno (EINVAL);
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return NULL;
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}
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/* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b)
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[System Application Program Interface (API) Amendment 1:
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Realtime Extensions], Rationale B.8.3.3
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Open a Stream on a File Descriptor says:
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Although not explicitly required by POSIX.1, a good
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implementation of append ("a") mode would cause the
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O_APPEND flag to be set.
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(Historical implementations [such as Solaris2] do a one-time
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seek in fdopen.)
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However, we do not turn O_APPEND off if the mode is "w" (even
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though that would seem consistent) because that would be more
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likely to break historical programs.
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*/
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if ((read_write & _IO_IS_APPENDING) && !(fd_flags & O_APPEND))
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{
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do_seek = true;
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if (__fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1)
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return NULL;
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}
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new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
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if (new_f == NULL)
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return NULL;
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#ifdef _IO_MTSAFE_IO
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new_f->fp.file._lock = &new_f->lock;
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#endif
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_IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd,
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#if _G_HAVE_MMAP
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(use_mmap && (read_write & _IO_NO_WRITES))
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? &_IO_wfile_jumps_maybe_mmap :
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#endif
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&_IO_wfile_jumps);
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_IO_JUMPS (&new_f->fp) =
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#if _G_HAVE_MMAP
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(use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_file_jumps_maybe_mmap :
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#endif
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&_IO_file_jumps;
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_IO_new_file_init_internal (&new_f->fp);
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/* We only need to record the fd because _IO_file_init_internal will
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have unset the offset. It is important to unset the cached
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offset because the real offset in the file could change between
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now and when the handle is activated and we would then mislead
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ftell into believing that we have a valid offset. */
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new_f->fp.file._fileno = fd;
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new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE;
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_IO_mask_flags (&new_f->fp.file, read_write,
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_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING);
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/* For append mode, set the file offset to the end of the file if we added
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O_APPEND to the file descriptor flags. Don't update the offset cache
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though, since the file handle is not active. */
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if (do_seek && ((read_write & (_IO_IS_APPENDING | _IO_NO_READS))
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== (_IO_IS_APPENDING | _IO_NO_READS)))
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{
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off64_t new_pos = _IO_SYSSEEK (&new_f->fp.file, 0, _IO_seek_end);
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if (new_pos == _IO_pos_BAD && errno != ESPIPE)
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return NULL;
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}
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return &new_f->fp.file;
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}
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libc_hidden_ver (_IO_new_fdopen, _IO_fdopen)
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strong_alias (_IO_new_fdopen, __new_fdopen)
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versioned_symbol (libc, _IO_new_fdopen, _IO_fdopen, GLIBC_2_1);
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versioned_symbol (libc, __new_fdopen, fdopen, GLIBC_2_1);
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