| /* Copyright (C) 1993-2014 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 |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. |
| |
| As a special exception, if you link the code in this file with |
| files compiled with a GNU compiler to produce an executable, |
| that does not cause the resulting executable to be covered by |
| the GNU Lesser General Public License. This exception does not |
| however invalidate any other reasons why the executable file |
| might be covered by the GNU Lesser General Public License. |
| This exception applies to code released by its copyright holders |
| in files containing the exception. */ |
| |
| #include <stdlib.h> |
| #include "libioP.h" |
| #include <fcntl.h> |
| |
| #ifdef _LIBC |
| # include <shlib-compat.h> |
| #endif |
| |
| #ifndef _IO_fcntl |
| #ifdef _LIBC |
| #define _IO_fcntl __fcntl |
| #else |
| #define _IO_fcntl fcntl |
| #endif |
| #endif |
| |
| _IO_FILE * |
| _IO_new_fdopen (fd, mode) |
| int fd; |
| const char *mode; |
| { |
| int read_write; |
| int posix_mode = 0; |
| struct locked_FILE |
| { |
| struct _IO_FILE_plus fp; |
| #ifdef _IO_MTSAFE_IO |
| _IO_lock_t lock; |
| #endif |
| struct _IO_wide_data wd; |
| } *new_f; |
| int fd_flags; |
| int i; |
| int use_mmap = 0; |
| |
| switch (*mode) |
| { |
| case 'r': |
| read_write = _IO_NO_WRITES; |
| break; |
| case 'w': |
| read_write = _IO_NO_READS; |
| break; |
| case 'a': |
| posix_mode = O_APPEND; |
| read_write = _IO_NO_READS|_IO_IS_APPENDING; |
| break; |
| default: |
| MAYBE_SET_EINVAL; |
| return NULL; |
| } |
| for (i = 1; i < 5; ++i) |
| { |
| switch (*++mode) |
| { |
| case '\0': |
| break; |
| case '+': |
| read_write &= _IO_IS_APPENDING; |
| break; |
| case 'm': |
| use_mmap = 1; |
| continue; |
| case 'x': |
| case 'b': |
| default: |
| /* Ignore */ |
| continue; |
| } |
| break; |
| } |
| #ifdef F_GETFL |
| fd_flags = _IO_fcntl (fd, F_GETFL); |
| #ifndef O_ACCMODE |
| #define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR) |
| #endif |
| if (fd_flags == -1) |
| return NULL; |
| |
| if (((fd_flags & O_ACCMODE) == O_RDONLY && !(read_write & _IO_NO_WRITES)) |
| || ((fd_flags & O_ACCMODE) == O_WRONLY && !(read_write & _IO_NO_READS))) |
| { |
| MAYBE_SET_EINVAL; |
| return NULL; |
| } |
| |
| /* The May 93 draft of P1003.4/D14.1 (redesignated as 1003.1b) |
| [System Application Program Interface (API) Amendment 1: |
| Realtime Extensions], Rationale B.8.3.3 |
| Open a Stream on a File Descriptor says: |
| |
| Although not explicitly required by POSIX.1, a good |
| implementation of append ("a") mode would cause the |
| O_APPEND flag to be set. |
| |
| (Historical implementations [such as Solaris2] do a one-time |
| seek in fdopen.) |
| |
| However, we do not turn O_APPEND off if the mode is "w" (even |
| though that would seem consistent) because that would be more |
| likely to break historical programs. |
| */ |
| if ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND)) |
| { |
| #ifdef F_SETFL |
| if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1) |
| #endif |
| return NULL; |
| } |
| #endif |
| |
| new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); |
| if (new_f == NULL) |
| return NULL; |
| #ifdef _IO_MTSAFE_IO |
| new_f->fp.file._lock = &new_f->lock; |
| #endif |
| _IO_no_init (&new_f->fp.file, 0, 0, &new_f->wd, |
| #ifdef _G_HAVE_MMAP |
| (use_mmap && (read_write & _IO_NO_WRITES)) |
| ? &_IO_wfile_jumps_maybe_mmap : |
| #endif |
| &_IO_wfile_jumps); |
| _IO_JUMPS (&new_f->fp) = |
| #ifdef _G_HAVE_MMAP |
| (use_mmap && (read_write & _IO_NO_WRITES)) ? &_IO_file_jumps_maybe_mmap : |
| #endif |
| &_IO_file_jumps; |
| _IO_file_init (&new_f->fp); |
| #if !_IO_UNIFIED_JUMPTABLES |
| new_f->fp.vtable = NULL; |
| #endif |
| /* We only need to record the fd because _IO_file_init will have unset the |
| offset. It is important to unset the cached offset because the real |
| offset in the file could change between now and when the handle is |
| activated and we would then mislead ftell into believing that we have a |
| valid offset. */ |
| new_f->fp.file._fileno = fd; |
| new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE; |
| |
| _IO_mask_flags (&new_f->fp.file, read_write, |
| _IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); |
| |
| /* For append mode, set the file offset to the end of the file. Don't |
| update the offset cache though, since the file handle is not active. */ |
| if ((read_write & (_IO_IS_APPENDING | _IO_NO_READS)) |
| == (_IO_IS_APPENDING | _IO_NO_READS)) |
| { |
| _IO_off64_t new_pos = _IO_SYSSEEK (&new_f->fp.file, 0, _IO_seek_end); |
| if (new_pos == _IO_pos_BAD && errno != ESPIPE) |
| return NULL; |
| } |
| return &new_f->fp.file; |
| } |
| libc_hidden_ver (_IO_new_fdopen, _IO_fdopen) |
| |
| strong_alias (_IO_new_fdopen, __new_fdopen) |
| versioned_symbol (libc, _IO_new_fdopen, _IO_fdopen, GLIBC_2_1); |
| versioned_symbol (libc, __new_fdopen, fdopen, GLIBC_2_1); |