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0469311e87
2002-01-07 Ulrich Drepper <drepper@redhat.com> * libio/fileops.c (_IO_file_underflow_mmap): New function. (_IO_file_close_mmap): New function. (_IO_file_jumps_mmap): New variable. * libio/wfileops.c (_IO_wfile_underflow): Reset read pointer before trying to convert rest of byte buffer. (_IO_wfile_underflow_mmap): New function. (_IO_wfile_jumps_mmap): New variable. * libio/iofopen.c (__fopen_maybe_mmap): New function. (__fopen_internal): New function. Split out from _IO_new_fopen. (_IO_new_fopen): Call __fopen_internal. * libio/iofopen64.c: Just call __fopen_internal. * libio/iofdopen.c: Call __fopen_maybe_mmap before returning successfully. * libio/iolibio.h: Declare __fopen_internal and __fopen_maybe_mmap. * libio/libioP.h: Declare _IO_file_jumps_mmap, _IO_wfile_jumps_mmap, _IO_file_close_mmap. * sysdeps/gnu/_G_config.h: Define _G_MMAP64. * sysdeps/unix/sysv/linux/cris/_G_config.h: Likewise. * stdio-common/Makefile (tests): Add tst-rndseek. * stdio-common/tst-rndseek.c: New file.
151 lines
4.3 KiB
C
151 lines
4.3 KiB
C
/* Copyright (C) 1993,1994,1997-1999,2000,2002 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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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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#ifdef __STDC__
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# include <stdlib.h>
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#endif
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#include "libioP.h"
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#include <fcntl.h>
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#ifdef _LIBC
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# include <shlib-compat.h>
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#endif
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#ifndef _IO_fcntl
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#ifdef _LIBC
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#define _IO_fcntl __fcntl
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#else
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#define _IO_fcntl fcntl
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#endif
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#endif
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_IO_FILE *
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_IO_new_fdopen (fd, mode)
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int fd;
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const char *mode;
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{
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int read_write;
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int posix_mode = 0;
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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 fd_flags;
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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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posix_mode = O_APPEND;
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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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MAYBE_SET_EINVAL;
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return NULL;
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}
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if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+'))
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read_write &= _IO_IS_APPENDING;
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#ifdef F_GETFL
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fd_flags = _IO_fcntl (fd, F_GETFL);
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#ifndef O_ACCMODE
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#define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
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#endif
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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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MAYBE_SET_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 ((posix_mode & O_APPEND) && !(fd_flags & O_APPEND))
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{
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#ifdef F_SETFL
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if (_IO_fcntl (fd, F_SETFL, fd_flags | O_APPEND) == -1)
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#endif
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return NULL;
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}
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#endif
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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, &_IO_wfile_jumps);
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_IO_JUMPS (&new_f->fp) = &_IO_file_jumps;
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_IO_file_init (&new_f->fp);
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#if !_IO_UNIFIED_JUMPTABLES
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new_f->fp.vtable = NULL;
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#endif
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if (_IO_file_attach ((_IO_FILE *) &new_f->fp, fd) == NULL)
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{
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_IO_un_link (&new_f->fp);
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free (new_f);
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return NULL;
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}
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new_f->fp.file._flags &= ~_IO_DELETE_DONT_CLOSE;
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new_f->fp.file._IO_file_flags =
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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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return __fopen_maybe_mmap (&new_f->fp.file);
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}
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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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